{"id":78,"date":"2021-03-13T12:43:00","date_gmt":"2021-03-13T04:43:00","guid":{"rendered":"http:\/\/daishen.ltd\/?p=78"},"modified":"2021-03-13T12:43:17","modified_gmt":"2021-03-13T04:43:17","slug":"78","status":"publish","type":"post","link":"https:\/\/daishen.ltd\/?p=78","title":{"rendered":"mysql\u4f18\u5316"},"content":{"rendered":"<p><meta charset=\"UTF-8\"><meta name=\"viewport\" content=\"width=device-width initial-scale=1\"><br \/>\n<title>mysql\u4f18\u5316<\/title><\/p>\n<h1>1.\u4f18\u5316\u54f2\u5b66<\/h1>\n<h2>1.1 \u4e3a\u4ec0\u4e48\u4f18\u5316\uff1f<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u4e3a\u4e86\u83b7\u5f97\u6210\u5c31\u611f?\n\u4e3a\u4e86\u8bc1\u5b9e\u6bd4\u7cfb\u7edf\u8bbe\u8ba1\u8005\u66f4\u61c2\u6570\u636e\u5e93?\n\u4e3a\u4e86\u4ece\u4f18\u5316\u6210\u679c\u6765\u8bc1\u5b9e\u4f18\u5316\u8005\u66f4\u6709\u4ef7\u503c?\n<\/code><\/pre>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u4f46\u901a\u5e38\u4e8b\u5b9e\u8bc1\u5b9e\u7684\u7ed3\u679c\u5f80\u5f80\u4f1a\u548c\u60a8\u671f\u5f85\u76f8\u53cd\uff01\n\u4f18\u5316\u6709\u98ce\u9669\uff0c\u6d89\u8db3\u9700\u8c28\u614e\uff01\n<\/code><\/pre>\n<h2>1.2 \u4f18\u5316\u98ce\u9669<\/h2>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u4f18\u5316\u4e0d\u603b\u662f\u5bf9\u4e00\u4e2a\u5355\u7eaf\u7684\u73af\u5883\u8fdb\u884c\uff01\u8fd8\u5f88\u53ef\u80fd\u662f\u4e00\u4e2a\u590d\u6742\u7684\u5df2\u6295\u4ea7\u7684\u7cfb\u7edf\u3002\n\u4f18\u5316\u624b\u6bb5\u672c\u6765\u5c31\u6709\u5f88\u5927\u7684\u98ce\u9669\uff0c\u53ea\u4e0d\u8fc7\u4f60\u6ca1\u80fd\u529b\u610f\u8bc6\u5230\u548c\u9884\u89c1\u5230\uff01\n\u4efb\u4f55\u7684\u6280\u672f\u53ef\u4ee5\u89e3\u51b3\u4e00\u4e2a\u95ee\u9898\uff0c\u4f46\u5fc5\u7136\u5b58\u5728\u5e26\u6765\u4e00\u4e2a\u95ee\u9898\u7684\u98ce\u9669\uff01\n\u5bf9\u4e8e\u4f18\u5316\u6765\u8bf4\u89e3\u51b3\u95ee\u9898\u800c\u5e26\u6765\u7684\u95ee\u9898\u63a7\u5236\u5728\u53ef\u63a5\u53d7\u7684\u8303\u56f4\u5185\u624d\u662f\u6709\u6210\u679c\u3002\n\u4fdd\u6301\u73b0\u72b6\u6216\u51fa\u73b0\u66f4\u5dee\u7684\u60c5\u51b5\u90fd\u662f\u5931\u8d25\uff01\n\u7a33\u5b9a\u6027\u548c\u4e1a\u52a1\u53ef\u6301\u7eed\u6027\u901a\u5e38\u6bd4\u6027\u80fd\u66f4\u91cd\u8981\uff01\n\u4f18\u5316\u4e0d\u53ef\u907f\u514d\u6d89\u53ca\u5230\u53d8\u66f4\uff0c\u53d8\u66f4\u5c31\u6709\u98ce\u9669\uff01\n\u4f18\u5316\u4f7f\u6027\u80fd\u53d8\u597d\uff0c\u7ef4\u6301\u548c\u53d8\u5dee\u662f\u7b49\u6982\u7387\u4e8b\u4ef6\uff01\n\u4f18\u5316\u4e0d\u80fd\u53ea\u662f\u6570\u636e\u5e93\u7ba1\u7406\u5458\u62c5\u5f53\u98ce\u9669\uff0c\u4f46\u4f1a\u6240\u6709\u7684\u4eba\u5206\u4eab\u4f18\u5316\u6210\u679c\uff01\n\u6240\u4ee5\u4f18\u5316\u5de5\u4f5c\u662f\u7531\u4e1a\u52a1\u9700\u8981\u9a71\u4f7f\u7684\uff01\uff01\uff01\n<\/code><\/pre>\n<h2>1.3 \u8c01\u53c2\u4e0e\u4f18\u5316<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u6570\u636e\u5e93\u7ba1\u7406\u5458\n\u4e1a\u52a1\u90e8\u95e8\u4ee3\u8868\n\u5e94\u7528\u7a0b\u5e8f\u67b6\u6784\u5e08\n\u5e94\u7528\u7a0b\u5e8f\u8bbe\u8ba1\u4eba\u5458\n\u5e94\u7528\u7a0b\u5e8f\u5f00\u53d1\u4eba\u5458\n\u786c\u4ef6\u53ca\u7cfb\u7edf\u7ba1\u7406\u5458\n\u5b58\u50a8\u7ba1\u7406\u5458\n<\/code><\/pre>\n<h2>1.4 \u4f18\u5316\u65b9\u5411<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u5b89\u5168\u4f18\u5316\uff08\u4e1a\u52a1\u6301\u7eed\u6027\uff09\n\u6027\u80fd\u4f18\u5316\uff08\u4e1a\u52a1\u9ad8\u6548\u6027\uff09\n<\/code><\/pre>\n<h2>1.5 \u4f18\u5316\u7684\u8303\u56f4\u53ca\u601d\u8def<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-csharp\" lang=\"csharp\">\u4f18\u5316\u8303\u56f4\uff1a\n\u5b58\u50a8\u3001\u4e3b\u673a\u548c\u64cd\u4f5c\u7cfb\u7edf:\n    \u4e3b\u673a\u67b6\u6784\u7a33\u5b9a\u6027\n    I\/O\u89c4\u5212\u53ca\u914d\u7f6e\n    Swap\n    OS\u5185\u6838\u53c2\u6570\n        \u7f51\u7edc\u95ee\u9898\n\u5e94\u7528\u7a0b\u5e8f:\uff08Index\uff0clock\uff0csession\uff09\n        \u5e94\u7528\u7a0b\u5e8f\u7a33\u5b9a\u6027\u548c\u6027\u80fd\n        SQL\u8bed\u53e5\u6027\u80fd\n    \u4e32\u884c\u8bbf\u95ee\u8d44\u6e90\n    \u6027\u80fd\u6b20\u4f73\u4f1a\u8bdd\u7ba1\u7406\n\u6570\u636e\u5e93\u4f18\u5316:\uff08\u5185\u5b58\u3001\u6570\u636e\u5e93\u8bbe\u8ba1\u3001\u53c2\u6570\uff09\n    \u5185\u5b58\n    \u6570\u636e\u5e93\u7ed3\u6784(\u7269\u7406&amp;\u903b\u8f91)\n    \u5b9e\u4f8b\u914d\u7f6e\n<\/code><\/pre>\n<h2>\u4f18\u5316\u6548\u679c\u548c\u6210\u672c\u7684\u8bc4\u4f30\uff1a<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/\/\/upload-images.jianshu.io\/upload_images\/16956686-678232e9db29674c.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/816\/format\/webp\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>image.png<\/p>\n<h1>2. \u4f18\u5316\u5de5\u5177\u7684\u4f7f\u7528<\/h1>\n<h2>2.1 \u7cfb\u7edf\u5c42\u9762\u7684<\/h2>\n<h3>2.1.1 CPU<\/h3>\n<h3>top<\/h3>\n<h3>cpu\u4f7f\u7528\u60c5\u51b5\u7684\u5e73\u5747\u503c\uff1a<\/h3>\n<pre><code>%Cpu(s):  0.3 us,  0.3 sy,  0.0 ni, 99.3 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st\n<\/code><\/pre>\n<p>&nbsp;<\/p>\n<h3>CPU\u6bcf\u4e2a\u6838\u5fc3\u7684\u5206\u522b\u4f7f\u7528\u7684\u60c5\u51b5\uff08\u63091\uff09\uff1a<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/\/\/upload-images.jianshu.io\/upload_images\/16956686-79cd367c7f5cc972.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/880\/format\/webp\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>image.png<\/p>\n<h3>\u7a0b\u5e8f\u662f\u5982\u4f55\u4f7f\u7528CPU\u7684\uff1f<\/h3>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u7cfb\u7edf\u7ed9\u6bcf\u4e2a\u7a0b\u5e8f\u5206\u914dCPU\u7684\u65f6\u5019\uff0c\u4ee5\u65f6\u95f4\u6765\u5212\u5206\u8868\u7684\u3002\n<\/code><\/pre>\n<h3>CPU\u6709\u6548\u5de5\u4f5c\u65f6\u95f4?<\/h3>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u8ba1\u7b97: \u7a0b\u5e8f\u8fd0\u884c,\u6570\u636e\u5904\u7406\n\u63a7\u5236: \u5c11\u91cf\u7684\u5173\u4e8e\u7533\u8bf7\u8d44\u6e90\u548c\u91ca\u653e\u8d44\u6e90\u7b49\n<\/code><\/pre>\n<h3>CPU\u65e0\u6548\u5de5\u4f5c\u65f6\u95f4<\/h3>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u7b49\u5f85 IO\n<\/code><\/pre>\n<h3>CPU\u5404\u9879\u6307\u6807\u8bf4\u660e<\/h3>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-text\" lang=\"text\">us:\u7528\u6237\u7a0b\u5e8f\uff0c\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u4f7f\u7528\u7684CPU\u65f6\u95f4\u7684\u5360\u6bd4\u3002\n\u6211\u4eec\u5e0c\u671b\u7684\u662f\u8d8a\u9ad8\u8d8a\u597d\uff0c\u5c3d\u91cf\u63a7\u5236\u572890%\nsy:\u63a7\u5236: \u8d44\u6e90\u7ba1\u7406\uff0c\u5185\u6838\u7684\u5de5\u4f5c(\u7cfb\u7edf\u8c03\u7528)\n\tsys\u9ad8\u7684\u539f\u56e0: \n      1.  \u5185\u6838\u672c\u8eabbug\n      2.  \u9501\u7684\u95ee\u9898\n      3.  \u5e76\u53d1\u5f88\u9ad8\n      \nid :CPU\u7a7a\u95f4\u7684\u65f6\u95f4\u5360\u6bd4      \n\nwa:CPU\u82b1\u5728\u7b49\u5f85\u4e0a\u7684\u65f6\u95f4\n\twa\u9ad8\u7684\u539f\u56e0\uff1a\n      1. \u9501\n      2. IO \uff08raid\uff0c\u8fc7\u5ea6\u6761\u5e26\u5316\uff09\n      3. \u7d22\u5f15\n      4. \u7b49\u5f85\u5927\u7684\u5904\u7406\u4e8b\u4ef6\n          \n\u591acpu\u4f7f\u7528\u60c5\u51b5\u76d1\u63a7\uff1a\n\u4e3b\u8981\u5224\u65ad\u6211\u4eeccpu\u591a\u6838\u5fc3\u6709\u6ca1\u6709\u88ab\u5145\u5206\u5229\u7528\u3002\n\u73b0\u8c61\uff1a\u5355\u9897\u5f88\u5fd9\uff0c\u5176\u4ed6\u5f88\u95f2\uff0c\u5bf9\u4e8eMySQL\u6765\u8bb2\uff0c\u6709\u53ef\u80fd\u662f\u5e76\u53d1\u53c2\u6570\u8bbe\u5b9a\u4e0d\u5408\u7406\u5bfc\u81f4\u7684\u3002\n<\/code><\/pre>\n<h2>2.1.2 MEM<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-cpp\" lang=\"cpp\">KiB Mem :  4028432 total,  3774464 free,   116240 used,   137728 buff\/cache\n### 1.2.1 \u540d\u79f0\u4ecb\u7ecd\ntotal :\u603b\u5185\u5b58\u5927\u5c0f\nfree  \uff1a\u7a7a\u95f2\u7684\nused  \uff1a\u5728\u4f7f\u7528\u7684\nbuff\/cache \uff1a\u7f13\u51b2\u533a \u548c \u7f13\u5b58\n    \n    \nglances\n<\/code><\/pre>\n<h3>2.1.3 \u5185\u5b58\u7ba1\u7406\u5b50\u7cfb\u7edf\uff1a<\/h3>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-swift\" lang=\"swift\">slab Allocator\nbuddy system \n\u7a0b\u5e8f=\u6307\u4ee4+\u6570\u636e\n\u5bf9\u4e8epage cache\u6765\u8bb2(OS buffer)\n1. \u5185\u5b58\u7684\u53ef\u7528\u7a7a\u95f4\u7684\u8ba1\u7b97   free +buffer cache \n2. \u5185\u5b58\u56de\u6536(buffer)\u7684\u65b9\u5f0f:\n        (1) \u5199\u5165\u78c1\u76d8\n        (2) swap  \n\u5bf9\u4e8e\u6570\u636e\u5e93\u6765\u8bb2\uff1a\u9700\u8981\u5c06swap\u5c4f\u853d\u6389\n<\/code><\/pre>\n<h2>2.1.4 swap<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-ruby\" lang=\"ruby\">KiB Swap:  2097148 total,  2097148 free,        0 used.  3701464 avail Mem \nLinux 6\u64cd\u4f5c\u7cfb\u7edf\uff0c\u9ed8\u8ba4\u56de\u6536\u7b56\u7565\uff08buffer cache\uff09\uff0c\u4e0d\u7acb\u5373\u56de\u6536\u7b56\u7565\n\u5185\u5b58\u4f7f\u7528\u8fbe\u5230100%-60%\u65f6\u5019\uff0c40% \u4f1a\u4f7f\u7528swap\nLinux 7\u64cd\u4f5c\u7cfb\u7edf\n\u5185\u5b58\u4f7f\u7528\u8fbe\u5230100%-30%\uff0870%\uff09\u65f6\u5019\uff0c\u624d\u4f1a\u65f6\u5019swap\ncat \/proc\/sys\/vm\/swappiness \n30  \necho 0 &gt;\/proc\/sys\/vm\/swappiness    \u7684\u5185\u5bb9\u6539\u62100\uff08\u4e34\u65f6\uff09\nvim \/etc\/sysctl.conf\n\u6dfb\u52a0:\nvm.swappiness=0\nsysctl -p \n<\/code><\/pre>\n<h3>2.2. iostat \u547d\u4ee4<\/h3>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-ruby\" lang=\"ruby\">dd if=\/dev\/zero of=\/tmp\/bigfile bs=1M count=4096\niostat -dm 1\n\u73b0\u8c61\u8bf4\u660e\n1. IO \u9ad8 cpu us \u4e5f\u9ad8,\u5c5e\u4e8e\u6b63\u5e38\u73b0\u8c61\n2. CPU  us\u9ad8  IO\u5f88\u4f4e   ,MySQL \u4e0d\u5728\u505a\u589e\u5220\u6539\u67e5,\u6709\u53ef\u80fd\u662f\u5b58\u50a8\u8fc7\u7a0b,\u51fd\u6570,\u6392\u5e8f,\u5206\u7ec4,\u591a\u8868\u8fde\u63a5\n3. Wait,SYS \u9ad8  , IO\u4f4e:IO\u51fa\u95ee\u9898\u4e86,\u9501\u7b49\u5f85\u8fc7\u591a\u7684\u51e0\u7387\u6bd4\u8f83\u5927. \nIOPS\uff1a\u6bcf\u79d2\u78c1\u76d8\u6700\u591a\u80fd\u591f\u53d1\u751f\u7684IO\u6b21\u6570\uff0c\u8fd9\u662f\u4e2a\u5b9a\u503c \n\u9891\u7e41\u5c0f\u4e8b\u52a1,IOPS\u5f88\u9ad8,\u8fbe\u5230\u9608\u503c,\u53ef\u80fdIO\u541e\u5410\u91cf\u6ca1\u8d85\u8fc7IO\u6700\u5927\u541e\u5410\u91cf.\u65e0\u6cd5\u65b0\u7684IO\u4e86\n\u5b58\u50a8\u89c4\u5212\u6709\u95ee\u9898.\n<\/code><\/pre>\n<h2>2.3 \u6570\u636e\u5e93\u4f18\u5316\u5de5\u5177<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-dart\" lang=\"dart\">    show status  \n    show variables \n    show index  \n    show processlist \n    show slave status\n    show engine innodb status \n    desc \/explain \n        slowlog\n        \n        \n    \u6269\u5c55\u7c7b\u6df1\u5ea6\u4f18\u5316:\n    pt\u7cfb\u5217\n    mysqlslap \n    sysbench \n    information_schema \n    performance_schema\n    sys\n<\/code><\/pre>\n<h1>3. \u4f18\u5316\u601d\u8def\u5206\u89e3<\/h1>\n<h2>3.1 \u786c\u4ef6\u4f18\u5316<\/h2>\n<h2>\u4e3b\u673a<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u771f\u5b9e\u7684\u786c\u4ef6\uff08PC Server\uff09: DELL  R\u7cfb\u5217 \uff0c\u534e\u4e3a\uff0c\u6d6a\u6f6e\uff0cHP\uff0c\u8054\u60f3\n\u4e91\u4ea7\u54c1\uff1aECS\u3001\u6570\u636e\u5e93RDS\u3001DRDS\nIBM \u5c0f\u578b\u673a P6  570  595   P7 720  750 780     P8 \n<\/code><\/pre>\n<h2>CPU\u6839\u636e\u6570\u636e\u5e93\u7c7b\u578b<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">OLTP \nOLAP  \nIO\u5bc6\u96c6\u578b\uff1a\u7ebf\u4e0a\u7cfb\u7edf\uff0cOLTP\u4e3b\u8981\u662fIO\u5bc6\u96c6\u578b\u7684\u4e1a\u52a1\uff0c\u9ad8\u5e76\u53d1\nCPU\u5bc6\u96c6\u578b\uff1a\u6570\u636e\u5206\u6790\u6570\u636e\u5904\u7406\uff0cOLAP\uff0ccpu\u5bc6\u96c6\u578b\u7684\uff0c\u9700\u8981CPU\u9ad8\u8ba1\u7b97\u80fd\u529b\uff08i\u7cfb\u5217\uff0cIBM power\u7cfb\u5217\uff09\nCPU\u5bc6\u96c6\u578b\uff1a I \u7cfb\u5217\u7684\uff0c\u4e3b\u9891\u5f88\u9ad8\uff0c\u6838\u5fc3\u5c11 \nIO\u5bc6\u96c6\u578b\uff1a  E\u7cfb\u5217\uff08\u81f3\u5f3a\uff09\uff0c\u4e3b\u9891\u76f8\u5bf9\u4f4e\uff0c\u6838\u5fc3\u6570\u91cf\u591a\n<\/code><\/pre>\n<h2>\u5185\u5b58<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u5efa\u8bae2-3\u500dcpu\u6838\u5fc3\u6570\u91cf \uff08ECC\uff09\n<\/code><\/pre>\n<h2>\u78c1\u76d8\u9009\u62e9<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-shell\" lang=\"shell\">SATA-III   SAS    Fc    SSD\uff08sata\uff09 pci-e  ssd  Flash\n\u4e3b\u673a RAID\u5361\u7684BBU(Battery Backup Unit)\u5173\u95ed\n<\/code><\/pre>\n<h2>\u5b58\u50a8<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u6839\u636e\u5b58\u50a8\u6570\u636e\u79cd\u7c7b\u7684\u4e0d\u540c\uff0c\u9009\u62e9\u4e0d\u540c\u7684\u5b58\u50a8\u8bbe\u5907\n\u914d\u7f6e\u5408\u7406\u7684RAID\u7ea7\u522b(raid5\u3001raid10\u3001\u70ed\u5907\u76d8)   \nr0 :\u6761\u5e26\u5316 ,\u6027\u80fd\u9ad8\nr1 :\u955c\u50cf\uff0c\u5b89\u5168\nr5 :\u6821\u9a8c+\u6761\u5e26\u5316\uff0c\u5b89\u5168\u8f83\u9ad8+\u6027\u80fd\u8f83\u9ad8\uff08\u8bfb\uff09\uff0c\u5199\u6027\u80fd\u8f83\u4f4e \uff08\u9002\u5408\u4e8e\u8bfb\u591a\u5199\u5c11\uff09\nr10\uff1a\u5b89\u5168+\u6027\u80fd\u90fd\u5f88\u9ad8\uff0c\u6700\u5c11\u56db\u5757\u76d8\uff0c\u6d6a\u8d39\u4e00\u534a\u7684\u7a7a\u95f4\uff08\u9ad8IO\u8981\u6c42\uff09\n<\/code><\/pre>\n<h2>\u7f51\u7edc<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">1\u3001\u786c\u4ef6\u4e70\u597d\u7684\uff08\u5355\u5361\u5355\u53e3\uff09\n2\u3001\u7f51\u5361\u7ed1\u5b9a\uff08bonding\uff09\uff0c\u4ea4\u6362\u673a\u5806\u53e0\n\u4ee5\u4e0a\u95ee\u9898\uff0c\u63d0\u524d\u89c4\u907f\u6389\u3002\n<\/code><\/pre>\n<h2>3.2 \u64cd\u4f5c\u7cfb\u7edf\u4f18\u5316<\/h2>\n<h2>Swap\u8c03\u6574<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-shell\" lang=\"shell\">echo 0 &gt;\/proc\/sys\/vm\/swappiness\u7684\u5185\u5bb9\u6539\u62100\uff08\u4e34\u65f6\uff09\uff0c\n\/etc\/sysctl.conf\n\u4e0a\u6dfb\u52a0vm.swappiness=0\uff08\u6c38\u4e45\uff09\nsysctl -p\n\n\u8fd9\u4e2a\u53c2\u6570\u51b3\u5b9a\u4e86Linux\u662f\u503e\u5411\u4e8e\u4f7f\u7528swap\uff0c\u8fd8\u662f\u503e\u5411\u4e8e\u91ca\u653e\u6587\u4ef6\u7cfb\u7edfcache\u3002\u5728\u5185\u5b58\u7d27\u5f20\u7684\u60c5\u51b5\u4e0b\uff0c\u6570\u503c\u8d8a\u4f4e\u8d8a\u503e\u5411\u4e8e\u91ca\u653e\u6587\u4ef6\u7cfb\u7edfcache\u3002\n\u5f53\u7136\uff0c\u8fd9\u4e2a\u53c2\u6570\u53ea\u80fd\u51cf\u5c11\u4f7f\u7528swap\u7684\u6982\u7387\uff0c\u5e76\u4e0d\u80fd\u907f\u514dLinux\u4f7f\u7528swap\u3002\n\n\u4fee\u6539MySQL\u7684\u914d\u7f6e\u53c2\u6570innodb_flush_method\uff0c\u5f00\u542fO_DIRECT\u6a21\u5f0f\n\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cInnoDB\u7684buffer pool\u4f1a\u76f4\u63a5\u7ed5\u8fc7\u6587\u4ef6\u7cfb\u7edfcache\u6765\u8bbf\u95ee\u78c1\u76d8\uff0c\u4f46\u662fredo log\u4f9d\u65e7\u4f1a\u4f7f\u7528\u6587\u4ef6\u7cfb\u7edfcache\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0cRedo log\u662f\u8986\u5199\u6a21\u5f0f\u7684\uff0c\u5373\u4f7f\u4f7f\u7528\u4e86\u6587\u4ef6\u7cfb\u7edf\u7684cache\uff0c\u4e5f\u4e0d\u4f1a\u5360\u7528\u592a\u591a\n<\/code><\/pre>\n<h2>IO\u8c03\u5ea6\u7b56\u7565<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-shell\" lang=\"shell\">centos 7 \u9ed8\u8ba4\u662fdeadline\ncat   \/sys\/block\/sda\/queue\/scheduler\n\n#\u4e34\u65f6\u4fee\u6539\u4e3adeadline(centos6)\necho deadline &gt;\/sys\/block\/sda\/queue\/scheduler \nvi \/boot\/grub\/grub.conf\n\u66f4\u6539\u5230\u5982\u4e0b\u5185\u5bb9:\nkernel \/boot\/vmlinuz-2.6.18-8.el5 ro root=LABEL=\/ elevator=deadline rhgb quiet\n\nIO \uff1a\n    raid\n    no lvm\n    ext4\u6216xfs\n    ssd\n    IO\u8c03\u5ea6\u7b56\u7565\n\u63d0\u524d\u89c4\u5212\u597d\u4ee5\u4e0a\u6240\u6709\u95ee\u9898\uff0c\u51cf\u8f7bMySQL\u4f18\u5316\u7684\u96be\u5ea6\u3002\n<\/code><\/pre>\n<h2>3.3 \u5e94\u7528\u7aef<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-shell\" lang=\"shell\">1. \u5f00\u53d1\u8fc7\u7a0b\u89c4\u8303,\u6807\u51c6\n2. \u51cf\u5c11\u70c2SQL:\u4e0d\u8d70\u7d22\u5f15,\u590d\u6742\u903b\u8f91,\u5207\u5272\u5927\u4e8b\u52a1.\n3. \u907f\u514d\u4e1a\u52a1\u903b\u8f91\u9519\u8bef,\u907f\u514d\u9501\u4e89\u7528.\n\u8fd9\u4e2a\u9636\u6bb5,\u9700\u8981\u6211\u4eecDBA\u6df1\u5165\u4e1a\u52a1,\u6216\u8005\u8981\u548c\u5f00\u53d1\u4eba\u5458\\\u4e1a\u52a1\u4eba\u5458\u914d\u5408\u5b9e\u73b0\n\n\u4f18\u5316,\u6700\u6839\u672c\u7684\u662f\"\u4f18\u5316\"\u4eba.\n                    ----oldguo      \n<\/code><\/pre>\n<h1>4. MySQL\u53c2\u6570\u4f18\u5316\u6d4b\u8bd5<\/h1>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-csharp\" lang=\"csharp\">\u865a\u62df\u673avm12.5\uff0cOS centos 6.9\uff08\u7cfb\u7edf\u5df2\u4f18\u5316\uff09\uff0ccpu*4\uff08I5 4440 3.1GHZ\uff09,MEM*4GB ,HardDisk:SSD\n\n\u6a21\u62df\u6570\u636e\u5e93\u6570\u636e\ndrop database if exists oldboy;\ncreate database oldboy charset utf8mb4 collate utf8mb4_bin;\nuse oldboy;\ncreate table t_100w (id int,num int,k1 char(2),k2 char(4),dt timestamp);\ndelimiter \/\/\ncreate  procedure rand_data(in num int)\nbegin\ndeclare str char(62) default 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';\ndeclare str2 char(2);\ndeclare str4 char(4);\ndeclare i int default 0;\nwhile i&lt;num do\nset str2=concat(substring(str,1+floor(rand()*61),1),substring(str,1+floor(rand()*61),1));\nset str4=concat(substring(str,1+floor(rand()*61),2),substring(str,1+floor(rand()*61),2));\nset i=i+1;\ninsert into t_100w values (i,floor(rand()*num),str2,str4,now());\nend while;\nend;\n\/\/\ndelimiter ;\n\u63d2\u5165100w\u6761\u6570\u636e\uff1a\ncall rand_data(10000000);\ncommit;\n\nmysqlslap --defaults-file=\/etc\/my.cnf \\\n--concurrency=100 --iterations=1 --create-schema='oldboy' \\\n--query=\"select * from oldboy.t1000w where k2='FGCD'\" engine=innodb \\\n--number-of-queries=200 -uroot -p123 -verbose\n<\/code><\/pre>\n<h1>5. \u4f18\u5316\u7ec6\u8282\uff1a<\/h1>\n<h2>5.1 \u53c2\u6570\u4f18\u5316<\/h2>\n<h2>Max_connections <strong>*<\/strong><\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-ruby\" lang=\"ruby\">\uff081\uff09\u7b80\u4ecb\nMysql\u7684\u6700\u5927\u8fde\u63a5\u6570\uff0c\u5982\u679c\u670d\u52a1\u5668\u7684\u5e76\u53d1\u8bf7\u6c42\u91cf\u6bd4\u8f83\u5927\uff0c\u53ef\u4ee5\u8c03\u9ad8\u8fd9\u4e2a\u503c\uff0c\u5f53\u7136\u8fd9\u662f\u8981\u5efa\u7acb\u5728\u673a\u5668\u80fd\u591f\u652f\u6491\u7684\u60c5\u51b5\u4e0b\uff0c\u56e0\u4e3a\u5982\u679c\u8fde\u63a5\u6570\u8d8a\u6765\u8d8a\u591a\uff0cmysql\u4f1a\u4e3a\u6bcf\u4e2a\u8fde\u63a5\u63d0\u4f9b\u7f13\u51b2\u533a\uff0c\u5c31\u4f1a\u5f00\u9500\u7684\u8d8a\u591a\u7684\u5185\u5b58\uff0c\u6240\u4ee5\u9700\u8981\u9002\u5f53\u7684\u8c03\u6574\u8be5\u503c\uff0c\u4e0d\u80fd\u968f\u4fbf\u53bb\u63d0\u9ad8\u8bbe\u503c\u3002\n\uff082\uff09\u5224\u65ad\u4f9d\u636e\nshow variables like 'max_connections';\n    +-----------------+-------+\n    | Variable_name   | Value |\n    +-----------------+-------+\n    | max_connections | 151   |\n    +-----------------+-------+\nshow status like 'Max_used_connections';\n    +----------------------+-------+\n    | Variable_name        | Value |\n    +----------------------+-------+\n    | Max_used_connections | 101   |\n    +----------------------+-------+\n\n\uff083\uff09\u4fee\u6539\u65b9\u5f0f\u4e3e\u4f8b\nvim \/etc\/my.cnf \nMax_connections=1024\n\n\u8865\u5145:\n    1.\u5f00\u542f\u6570\u636e\u5e93\u65f6,\u6211\u4eec\u53ef\u4ee5\u4e34\u65f6\u8bbe\u7f6e\u4e00\u4e2a\u6bd4\u8f83\u5927\u7684\u6d4b\u8bd5\u503c\n    2.\u89c2\u5bdfshow status like 'Max_used_connections';\u53d8\u5316\n    3.\u5982\u679cmax_used_connections\u8ddfmax_connections\u76f8\u540c,\n    \u90a3\u4e48\u5c31\u662fmax_connections\u8bbe\u7f6e\u8fc7\u4f4e\u6216\u8005\u8d85\u8fc7\u670d\u52a1\u5668\u7684\u8d1f\u8f7d\u4e0a\u9650\u4e86\uff0c\n    \u4f4e\u4e8e10%\u5219\u8bbe\u7f6e\u8fc7\u5927. \n<\/code><\/pre>\n<h2>back_log ***<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-dart\" lang=\"dart\">\uff081\uff09\u7b80\u4ecb\nmysql\u80fd\u6682\u5b58\u7684\u8fde\u63a5\u6570\u91cf\uff0c\u5f53\u4e3b\u8981mysql\u7ebf\u7a0b\u5728\u4e00\u4e2a\u5f88\u77ed\u65f6\u95f4\u5185\u5f97\u5230\u975e\u5e38\u591a\u7684\u8fde\u63a5\u8bf7\u6c42\u65f6\u5019\u5b83\u5c31\u4f1a\u8d77\u4f5c\u7528\uff0c\u5982\u679cmysql\u7684\u8fde\u63a5\u6570\u636e\u8fbe\u5230max_connections\u65f6\u5019\uff0c\u65b0\u6765\u7684\u8bf7\u6c42\u5c06\u4f1a\u88ab\u5b58\u5728\u5806\u6808\u4e2d\uff0c\u7b49\u5f85\u67d0\u4e00\u8fde\u63a5\u91ca\u653e\u8d44\u6e90\uff0c\u8be5\u63a8\u6808\u7684\u6570\u91cf\u53caback_log,\u5982\u679c\u7b49\u5f85\u8fde\u63a5\u7684\u6570\u91cf\u8d85\u8fc7back_log\uff0c\u5c06\u4e0d\u88ab\u6388\u4e88\u8fde\u63a5\u8d44\u6e90\u3002\nback_log\u503c\u6307\u51fa\u5728mysql\u6682\u65f6\u505c\u6b62\u56de\u7b54\u65b0\u8bf7\u6c42\u4e4b\u524d\u7684\u77ed\u65f6\u95f4\u5185\u6709\u591a\u5c11\u4e2a\u8bf7\u6c42\u53ef\u4ee5\u88ab\u5b58\u5728\u63a8\u6808\u4e2d\uff0c\u53ea\u6709\u5982\u679c\u671f\u671b\u5728\u4e00\u4e2a\u77ed\u65f6\u95f4\u5185\u6709\u5f88\u591a\u8fde\u63a5\u7684\u65f6\u5019\u9700\u8981\u589e\u52a0\u5b83\n\uff082\uff09\u5224\u65ad\u4f9d\u636e\nshow full processlist\n\u53d1\u73b0\u5927\u91cf\u7684\u5f85\u8fde\u63a5\u8fdb\u7a0b\u65f6\uff0c\u5c31\u9700\u8981\u52a0\u5927back_log\u6216\u8005\u52a0\u5927max_connections\u7684\u503c\n\uff083\uff09\u4fee\u6539\u65b9\u5f0f\u4e3e\u4f8b\nvim \/etc\/my.cnf \nback_log=1024\n<\/code><\/pre>\n<h2>wait_timeout\u548cinteractive_timeout <strong><\/strong><\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-dart\" lang=\"dart\">\uff081\uff09\u7b80\u4ecb\nwait_timeout\uff1a\u6307\u7684\u662fmysql\u5728\u5173\u95ed\u4e00\u4e2a\u975e\u4ea4\u4e92\u7684\u8fde\u63a5\u4e4b\u524d\u6240\u8981\u7b49\u5f85\u7684\u79d2\u6570\ninteractive_timeout\uff1a\u6307\u7684\u662fmysql\u5728\u5173\u95ed\u4e00\u4e2a\u4ea4\u4e92\u7684\u8fde\u63a5\u4e4b\u524d\u6240\u9700\u8981\u7b49\u5f85\u7684\u79d2\u6570\uff0c\u6bd4\u5982\u6211\u4eec\u5728\u7ec8\u7aef\u4e0a\u8fdb\u884cmysql\u7ba1\u7406\uff0c\u4f7f\u7528\u7684\u5373\u4f7f\u4ea4\u4e92\u7684\u8fde\u63a5\uff0c\u8fd9\u65f6\u5019\uff0c\u5982\u679c\u6ca1\u6709\u64cd\u4f5c\u7684\u65f6\u95f4\u8d85\u8fc7\u4e86interactive_time\u8bbe\u7f6e\u7684\u65f6\u95f4\u5c31\u4f1a\u81ea\u52a8\u7684\u65ad\u5f00\uff0c\u9ed8\u8ba4\u7684\u662f28800\uff0c\u53ef\u8c03\u4f18\u4e3a7200\u3002\nwait_timeout:\u5982\u679c\u8bbe\u7f6e\u592a\u5c0f\uff0c\u90a3\u4e48\u8fde\u63a5\u5173\u95ed\u7684\u5c31\u5f88\u5feb\uff0c\u4ece\u800c\u4f7f\u4e00\u4e9b\u6301\u4e45\u7684\u8fde\u63a5\u4e0d\u8d77\u4f5c\u7528\n\uff082\uff09\u8bbe\u7f6e\u5efa\u8bae\n\u5982\u679c\u8bbe\u7f6e\u592a\u5927\uff0c\u5bb9\u6613\u9020\u6210\u8fde\u63a5\u6253\u5f00\u65f6\u95f4\u8fc7\u957f\uff0c\u5728show processlist\u65f6\u5019\uff0c\u80fd\u770b\u5230\u5f88\u591a\u7684\u8fde\u63a5 \uff0c\u4e00\u822c\u5e0c\u671bwait_timeout\u5c3d\u53ef\u80fd\u4f4e\n\uff083\uff09\u4fee\u6539\u65b9\u5f0f\u4e3e\u4f8b\nwait_timeout=60\ninteractive_timeout=1200\n\u957f\u8fde\u63a5\u7684\u5e94\u7528\uff0c\u4e3a\u4e86\u4e0d\u53bb\u53cd\u590d\u7684\u56de\u6536\u548c\u5206\u914d\u8d44\u6e90\uff0c\u964d\u4f4e\u989d\u5916\u7684\u5f00\u9500\u3002\n\u4e00\u822c\u6211\u4eec\u4f1a\u5c06wait_timeout\u8bbe\u5b9a\u6bd4\u8f83\u5c0f\uff0cinteractive_timeout\u8981\u548c\u5e94\u7528\u5f00\u53d1\u4eba\u5458\u6c9f\u901a\u957f\u94fe\u63a5\u7684\u5e94\u7528\u662f\u5426\u5f88\u591a\u3002\u5982\u679c\u4ed6\u9700\u8981\u957f\u94fe\u63a5\uff0c\u90a3\u4e48\u8fd9\u4e2a\u503c\u53ef\u4ee5\u4e0d\u9700\u8981\u8c03\u6574\u3002\n\u53e6\u5916\u8fd8\u53ef\u4ee5\u4f7f\u7528\u7c7b\u5916\u7684\u53c2\u6570\u5f25\u8865\u3002\n<\/code><\/pre>\n<h2>5.4 key_buffer_size <strong>*<\/strong><\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-dart\" lang=\"dart\">\uff081\uff09\u7b80\u4ecb\nkey_buffer_size\u6307\u5b9a\u7d22\u5f15\u7f13\u51b2\u533a\u7684\u5927\u5c0f\uff0c\u5b83\u51b3\u5b9a\u7d22\u5f15\u5904\u7406\u7684\u901f\u5ea6\uff0c\u5c24\u5176\u662f\u7d22\u5f15\u8bfb\u7684\u901f\u5ea6\n\u300a1\u300b\u6b64\u53c2\u6570\u4e0emyisam\u8868\u7684\u7d22\u5f15\u6709\u5173\uff08myisam\u8868\u7684\u7d22\u5f15\u7f13\u51b2\u533a\uff09\n\u300a2\u300b\u4e34\u65f6\u8868\u7684\u521b\u5efa\u6709\u5173\uff08\u591a\u8868\u94fe\u63a5\u3001\u5b50\u67e5\u8be2\u4e2d\u3001union\uff09\uff08\u4e34\u65f6\u8868\u7684\u7f13\u51b2\u533a\uff09\n     \u5728\u6709\u4ee5\u4e0a\u67e5\u8be2\u8bed\u53e5\u51fa\u73b0\u7684\u65f6\u5019\uff0c\u9700\u8981\u521b\u5efa\u4e34\u65f6\u8868\uff0c\u7528\u5b8c\u4e4b\u540e\u4f1a\u88ab\u4e22\u5f03\n     \u4e34\u65f6\u8868\u6709\u4e24\u79cd\u521b\u5efa\u65b9\u5f0f\uff1a\n                        \u5185\u5b58\u4e2d-------&gt;key_buffer_size\n                        \u78c1\u76d8\u4e0a-------&gt;ibdata1(5.6)\n                                      ibtmp1 (5.7\uff09\n\uff082\uff09\u8bbe\u7f6e\u4f9d\u636e\n\u901a\u8fc7key_read_requests\u548ckey_reads\u53ef\u4ee5\u76f4\u5230key_baffer_size\u8bbe\u7f6e\u662f\u5426\u5408\u7406\u3002\nmysql&gt; show variables like \"key_buffer_size%\";\n+-----------------+---------+\n| Variable_name   | Value   |\n+-----------------+---------+\n| key_buffer_size | 8388608 |\n+-----------------+---------+\n1 row in set (0.00 sec)\n\nmysql&gt; \nmysql&gt; show status like \"key_read%\";\n+-------------------+-------+\n| Variable_name     | Value |\n+-------------------+-------+\n| Key_read_requests | 10    |\n| Key_reads         | 2     |\n+-------------------+-------+\n2 rows in set (0.00 sec)\n\nmysql&gt; \n\u4e00\u5171\u670910\u4e2a\u7d22\u5f15\u8bfb\u53d6\u8bf7\u6c42\uff0c\u67092\u4e2a\u8bf7\u6c42\u5728\u5185\u5b58\u4e2d\u6ca1\u6709\u627e\u5230\u76f4\u63a5\u4ece\u786c\u76d8\u4e2d\u8bfb\u53d6\u7d22\u5f15\n\u63a7\u5236\u5728 5%\u4ee5\u5185 \u3002\n\u6ce8\uff1akey_buffer_size\u53ea\u5bf9myisam\u8868\u8d77\u4f5c\u7528\uff0c\u5373\u4f7f\u4e0d\u4f7f\u7528myisam\u8868\uff0c\u4f46\u662f\u5185\u90e8\u7684\u4e34\u65f6\u78c1\u76d8\u8868\u662fmyisam\u8868\uff0c\u4e5f\u8981\u4f7f\u7528\u8be5\u503c\u3002\n\u53ef\u4ee5\u4f7f\u7528\u68c0\u67e5\u72b6\u6001\u503ccreated_tmp_disk_tables\u5f97\u77e5\uff1a\n\nmysql&gt; show status like \"created_tmp%\";\n+-------------------------+-------+\n| Variable_name           | Value |\n+-------------------------+-------+\n| Created_tmp_disk_tables | 0     |\n| Created_tmp_files       | 6     |\n| Created_tmp_tables      | 1     |\n+-------------------------+-------+\n3 rows in set (0.00 sec)\nmysql&gt; \n\u901a\u5e38\u5730\uff0c\u6211\u4eec\u4e60\u60ef\u4ee5 Created_tmp_tables\/(Created_tmp_disk_tables + Created_tmp_tables)\u8d8a\u9ad8\u8d8a\u597d \nCreated_tmp_disk_tables\/(Created_tmp_disk_tables + Created_tmp_tables) \n\n\u6216\u8005\u5df2\u5404\u81ea\u7684\u4e00\u4e2a\u65f6\u6bb5\u5185\u7684\u5dee\u989d\u8ba1\u7b97\uff0c\u6765\u5224\u65ad\u57fa\u4e8e\u5185\u5b58\u7684\u4e34\u65f6\u8868\u5229\u7528\u7387\u3002\u6240\u4ee5\uff0c\u6211\u4eec\u4f1a\u6bd4\u8f83\u5173\u6ce8 Created_tmp_disk_tables \u662f\u5426\u8fc7\u591a\uff0c\u4ece\u800c\u8ba4\u5b9a\u5f53\u524d\u670d\u52a1\u5668\u8fd0\u884c\u72b6\u51b5\u7684\u4f18\u52a3\u3002\nCreated_tmp_disk_tables\/(Created_tmp_disk_tables + Created_tmp_tables) \n\u63a7\u5236\u57285%-10%\u4ee5\u5185\n\u770b\u4ee5\u4e0b\u4f8b\u5b50\uff1a\n\u5728\u8c03\u7528mysqldump\u5907\u4efd\u6570\u636e\u65f6\uff0c\u5927\u6982\u6267\u884c\u6b65\u9aa4\u5982\u4e0b\uff1a\n180322 17:39:33       7 Connect     root@localhost on\n7 Query       \/*!40100 SET @@SQL_MODE='' *\/\n7 Init DB     guo\n7 Query       SHOW TABLES LIKE 'guo'\n7 Query       LOCK TABLES `guo` READ \/*!32311 LOCAL *\/\n7 Query       SET OPTION SQL_QUOTE_SHOW_CREATE=1\n7 Query       show create table `guo`\n7 Query       show fields from `guo`\n7 Query       show table status like 'guo'\n7 Query       SELECT \/*!40001 SQL_NO_CACHE *\/ * FROM `guo`\n7 Query       UNLOCK TABLES\n7 Quit\n\n\u5176\u4e2d\uff0c\u6709\u4e00\u6b65\u662f\uff1ashow fields from `guo`\u3002\u4eceslow query\u8bb0\u5f55\u7684\u6267\u884c\u8ba1\u5212\u4e2d\uff0c\u53ef\u4ee5\u77e5\u9053\u5b83\u4e5f\u4ea7\u751f\u4e86 Tmp_table_on_disk\u3002\n\n\u6240\u4ee5\u8bf4\uff0c\u4ee5\u4e0a\u516c\u5f0f\u5e76\u4e0d\u80fd\u771f\u6b63\u53cd\u6620\u5230mysql\u91cc\u4e34\u65f6\u8868\u7684\u5229\u7528\u7387\uff0c\u6709\u4e9b\u60c5\u51b5\u4e0b\u4ea7\u751f\u7684 Tmp_table_on_disk \u6211\u4eec\u5b8c\u5168\u4e0d\u7528\u62c5\u5fc3\uff0c\u56e0\u6b64\u6ca1\u5fc5\u8981\u8fc7\u5206\u5173\u6ce8 Created_tmp_disk_tables\uff0c\u4f46\u5982\u679c\u5b83\u7684\u503c\u5927\u7684\u79bb\u8c31\u7684\u8bdd\uff0c\u90a3\u5c31\u597d\u597d\u67e5\u4e00\u4e0b\uff0c\u4f60\u7684\u670d\u52a1\u5668\u5230\u5e95\u90fd\u5728\u6267\u884c\u4ec0\u4e48\u67e5\u8be2\u4e86\u3002 \n\uff083\uff09\u914d\u7f6e\u65b9\u6cd5\nkey_buffer_size=64M\n<\/code><\/pre>\n<h2>query_cache_size ***<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-shell\" lang=\"shell\">\uff081\uff09\u7b80\u4ecb\uff1a\n\u67e5\u8be2\u7f13\u5b58\u7b80\u79f0QC\uff0c\u4f7f\u7528\u67e5\u8be2\u7f13\u51b2\uff0cmysql\u5c06\u67e5\u8be2\u7ed3\u679c\u5b58\u653e\u5728\u7f13\u51b2\u533a\u4e2d\uff0c\u4eca\u540e\u5bf9\u4e8e\u540c\u6837\u7684select\u8bed\u53e5\uff08\u533a\u5206\u5927\u5c0f\u5199\uff09,\u5c06\u76f4\u63a5\u4ece\u7f13\u51b2\u533a\u4e2d\u8bfb\u53d6\u7ed3\u679c\u3002\n\nSQL\u5c42\uff1a\nselect * from t1 where name=:NAME;\nselect * from t1 where name=:NAME;\n\n1\u3001\u67e5\u8be2\u5b8c\u7ed3\u679c\u4e4b\u540e\uff0c\u4f1a\u5bf9SQL\u8bed\u53e5\u8fdb\u884chash\u8fd0\u7b97\uff0c\u5f97\u51fahash\u503c,\u6211\u4eec\u628a\u4ed6\u79f0\u4e4b\u4e3aSQL_ID\n2\u3001\u4f1a\u5c06\u5b58\u50a8\u5f15\u64ce\u8fd4\u56de\u7684\u7ed3\u679c+SQL_ID\u5b58\u50a8\u5230\u7f13\u5b58\u4e2d\u3002\n\n\u5b58\u50a8\u65b9\u5f0f\uff1a\n\u4f8b\u5b50\uff1aselect * from t1  where id=10;      100\u6b21\n\n1\u3001\u5c06select * from t1  where id=10; \u8fdb\u884chash\u8fd0\u7b97\u8ba1\u7b97\u51fa\u4e00\u4e32hash\u503c\uff0c\u6211\u4eec\u628a\u5b83\u79f0\u4e4b\u4e3a\u201cSQL_ID\"\n2\u3001\u5c06\u5b58\u50a8\u5f15\u64ce\u8fd4\u56de\u4e0a\u6765\u7684\u8868\u7684\u5185\u5bb9+SQLID\u5b58\u50a8\u5230\u67e5\u8be2\u7f13\u5b58\u4e2d\n\n\u4f7f\u7528\u65b9\u5f0f\uff1a\n1\u3001\u4e00\u6761SQL\u6267\u884c\u65f6\uff0c\u8fdb\u884chash\u8fd0\u7b97\uff0c\u5f97\u51faSQLID\uff0c\u53bb\u627equery cache\n2\u3001\u5982\u679ccache\u4e2d\u6709\uff0c\u5219\u76f4\u63a5\u8fd4\u56de\u6570\u636e\u884c\uff0c\u5982\u679c\u6ca1\u6709\uff0c\u5c31\u8d70\u539f\u6709\u7684SQL\u6267\u884c\u6d41\u7a0b\n\n\u4e00\u4e2asql\u67e5\u8be2\u5982\u679c\u4ee5select\u5f00\u5934\uff0c\u90a3\u4e48mysql\u670d\u52a1\u5668\u5c06\u5c1d\u8bd5\u5bf9\u5176\u4f7f\u7528\u67e5\u8be2\u7f13\u5b58\u3002\n\u6ce8\uff1a\u4e24\u4e2asql\u8bed\u53e5\uff0c\u53ea\u8981\u60f3\u5dee\u54ea\u6015\u662f\u4e00\u4e2a\u5b57\u7b26\uff08\u5217\u5982\u5927\u5c0f\u5199\u4e0d\u4e00\u6837\uff1b\u591a\u4e00\u4e2a\u7a7a\u683c\u7b49\uff09,\u90a3\u4e48\u8fd9\u4e24\u4e2asql\u5c06\u4f7f\u7528\u4e0d\u540c\u7684\u4e00\u4e2acache\u3002\n\n\uff082\uff09\u5224\u65ad\u4f9d\u636e\nmysql&gt; show status like \"%Qcache%\";\n+-------------------------+---------+\n| Variable_name           | Value   |\n+-------------------------+---------+\n| Qcache_free_blocks      | 1       |\n| Qcache_free_memory      | 1031360 |\n| Qcache_hits             | 0       |\n| Qcache_inserts          | 0       |\n| Qcache_lowmem_prunes    | 0       |\n| Qcache_not_cached       | 2002    |\n| Qcache_queries_in_cache | 0       |\n| Qcache_total_blocks     | 1       |\n+-------------------------+---------+\n8 rows in set (0.00 sec)\n\n---------------------\u72b6\u6001\u8bf4\u660e--------------------\nQcache_free_blocks\uff1a\u7f13\u5b58\u4e2d\u76f8\u90bb\u5185\u5b58\u5757\u7684\u4e2a\u6570\u3002\n\u5982\u679c\u8be5\u503c\u663e\u793a\u8f83\u5927\uff0c\u5219\u8bf4\u660eQuery Cache \u4e2d\u7684\u5185\u5b58\u788e\u7247\u8f83\u591a\u4e86\uff0cFLUSH QUERY CACHE\u4f1a\u5bf9\u7f13\u5b58\u4e2d\u7684\u788e\u7247\u8fdb\u884c\u6574\u7406\uff0c\u4ece\u800c\u5f97\u5230\u4e00\u4e2a\u7a7a\u95f2\u5757\u3002\n\u6ce8\uff1a\u5f53\u4e00\u4e2a\u8868\u88ab\u66f4\u65b0\u4e4b\u540e\uff0c\u548c\u5b83\u76f8\u5173\u7684cache \nblocks\u5c06\u88abfree\u3002\u4f46\u662f\u8fd9\u4e2ablock\u4f9d\u7136\u53ef\u80fd\u5b58\u5728\u961f\u5217\u4e2d\uff0c\u9664\u975e\u662f\u5728\u961f\u5217\u7684\u5c3e\u90e8\u3002\u53ef\u4ee5\u7528FLUSH QUERY CACHE\u8bed\u53e5\u6765\u6e05\u7a7afree blocks\n\nQcache_free_memory\uff1aQuery Cache \u4e2d\u76ee\u524d\u5269\u4f59\u7684\u5185\u5b58\u5927\u5c0f\u3002\u901a\u8fc7\u8fd9\u4e2a\u53c2\u6570\u6211\u4eec\u53ef\u4ee5\u8f83\u4e3a\u51c6\u786e\u7684\u89c2\u5bdf\u51fa\u5f53\u524d\u7cfb\u7edf\u4e2d\u7684Query Cache \u5185\u5b58\u5927\u5c0f\u662f\u5426\u8db3\u591f\uff0c\u662f\u9700\u8981\u589e\u52a0\u8fd8\u662f\u8fc7\u591a\u4e86\u3002\n\nQcache_hits\uff1a\u8868\u793a\u6709\u591a\u5c11\u6b21\u547d\u4e2d\u7f13\u5b58\u3002\u6211\u4eec\u4e3b\u8981\u53ef\u4ee5\u901a\u8fc7\u8be5\u503c\u6765\u9a8c\u8bc1\u6211\u4eec\u7684\u67e5\u8be2\u7f13\u5b58\u7684\u6548\u679c\u3002\u6570\u5b57\u8d8a\u5927\uff0c\u7f13\u5b58\u6548\u679c\u8d8a\u7406\u60f3\u3002\n\nQcache_inserts\uff1a\u8868\u793a\u591a\u5c11\u6b21\u672a\u547d\u4e2d\u7136\u540e\u63d2\u5165\uff0c\u610f\u601d\u662f\u65b0\u6765\u7684SQL\u8bf7\u6c42\u5728\u7f13\u5b58\u4e2d\u672a\u627e\u5230\uff0c\u4e0d\u5f97\u4e0d\u6267\u884c\u67e5\u8be2\u5904\u7406\uff0c\u6267\u884c\u67e5\u8be2\u5904\u7406\u540e\u628a\u7ed3\u679cinsert\u5230\u67e5\u8be2\u7f13\u5b58\u4e2d\u3002\u8fd9\u6837\u7684\u60c5\u51b5\u7684\u6b21\u6570\u8d8a\u591a\uff0c\u8868\u793a\u67e5\u8be2\u7f13\u5b58\u5e94\u7528\u5230\u7684\u6bd4\u8f83\u5c11\uff0c\u6548\u679c\u4e5f\u5c31\u4e0d\u7406\u60f3\u3002\u5f53\u7136\u7cfb\u7edf\u521a\u542f\u52a8\u540e\uff0c\u67e5\u8be2\u7f13\u5b58\u662f\u7a7a\u7684\uff0c\u8fd9\u5f88\u6b63\u5e38\u3002\n\nQcache_lowmem_prunes\uff1a\n\u591a\u5c11\u6761Query\u56e0\u4e3a\u5185\u5b58\u4e0d\u8db3\u800c\u88ab\u6e05\u9664\u51faQueryCache\u3002\u901a\u8fc7\u201cQcache_lowmem_prunes\u201d\u548c\u201cQcache_free_memory\u201d\u76f8\u4e92\u7ed3\u5408\uff0c\u80fd\u591f\u66f4\u6e05\u695a\u7684\u4e86\u89e3\u5230\u6211\u4eec\u7cfb\u7edf\u4e2dQuery Cache \u7684\u5185\u5b58\u5927\u5c0f\u662f\u5426\u771f\u7684\u8db3\u591f\uff0c\u662f\u5426\u975e\u5e38\u9891\u7e41\u7684\u51fa\u73b0\u56e0\u4e3a\u5185\u5b58\u4e0d\u8db3\u800c\u6709Query \u88ab\u6362\u51fa\u3002\u8fd9\u4e2a\u6570\u5b57\u6700\u597d\u957f\u65f6\u95f4\u6765\u770b\uff1b\u5982\u679c\u8fd9\u4e2a\u6570\u5b57\u5728\u4e0d\u65ad\u589e\u957f\uff0c\u5c31\u8868\u793a\u53ef\u80fd\u788e\u7247\u975e\u5e38\u4e25\u91cd\uff0c\u6216\u8005\u5185\u5b58\u5f88\u5c11\u3002\uff08\u4e0a\u9762\u7684free_blocks\u548cfree_memory\u53ef\u4ee5\u544a\u8bc9\u60a8\u5c5e\u4e8e\u54ea\u79cd\u60c5\u51b5\uff09\n\nQcache_not_cached\uff1a\u4e0d\u9002\u5408\u8fdb\u884c\u7f13\u5b58\u7684\u67e5\u8be2\u7684\u6570\u91cf\uff0c\u901a\u5e38\u662f\u7531\u4e8e\u8fd9\u4e9b\u67e5\u8be2\u4e0d\u662f SELECT \u8bed\u53e5\u6216\u8005\u7528\u4e86now()\u4e4b\u7c7b\u7684\u51fd\u6570\u3002\n\nQcache_queries_in_cache\uff1a\u5f53\u524dQuery Cache \u4e2dcache \u7684Query \u6570\u91cf\uff1b\nQcache_total_blocks\uff1a\u5f53\u524dQuery Cache \u4e2d\u7684block \u6570\u91cf\uff1b\u3002\nQcache_hits \/ (Qcache_inserts+Qcache_not_cached+Qcache_hits) \n    90\/         10000             0             90\n\n\u5982\u679c\u51fa\u73b0hits\u6bd4\u4f8b\u8fc7\u4f4e\uff0c\u5176\u5b9e\u5c31\u53ef\u4ee5\u5173\u95ed\u67e5\u8be2\u7f13\u5b58\u4e86\u3002\u4f7f\u7528redis\u4e13\u95e8\u7f13\u5b58\u6570\u636e\u5e93\n\nQcache_free_blocks    \u6765\u5224\u65ad\u788e\u7247\nQcache_free_memory   +   Qcache_lowmem_prunes  \u6765\u5224\u65ad\u5185\u5b58\u591f\u4e0d\u591f\nQcache_hits \u591a\u5c11\u6b21\u547d\u4e2d  Qcache_hits \/ (Qcache_inserts+Qcache_not_cached+Qcache_hits)  \n\n\uff083\uff09\u914d\u7f6e\u793a\u4f8b\nmysql&gt; show variables like '%query_cache%' ;\n+------------------------------+---------+\n| Variable_name                | Value   |\n+------------------------------+---------+\n| have_query_cache             | YES     |\n| query_cache_limit            | 1048576 |\n| query_cache_min_res_unit     | 4096    |\n| query_cache_size             | 1048576 |\n| query_cache_type             | OFF     |\n| query_cache_wlock_invalidate | OFF     |\n+------------------------------+---------+\n6 rows in set (0.00 sec)\n\nmysql&gt; \n-------------------\u914d\u7f6e\u8bf4\u660e-------------------------------\n\u4ee5\u4e0a\u4fe1\u606f\u53ef\u4ee5\u770b\u51faquery_cache_type\u4e3aoff\u8868\u793a\u4e0d\u7f13\u5b58\u4efb\u4f55\u67e5\u8be2\n\n\u5404\u5b57\u6bb5\u7684\u89e3\u91ca\uff1a\nquery_cache_limit\uff1a\u8d85\u8fc7\u6b64\u5927\u5c0f\u7684\u67e5\u8be2\u5c06\u4e0d\u7f13\u5b58\nquery_cache_min_res_unit\uff1a\u7f13\u5b58\u5757\u7684\u6700\u5c0f\u5927\u5c0f\uff0cquery_cache_min_res_unit\u7684\u914d\u7f6e\u662f\u4e00\u67c4\u201d\u53cc\u5203\u5251\u201d\uff0c\u9ed8\u8ba4\u662f4KB\uff0c\u8bbe\u7f6e\u503c\u5927\u5bf9\u5927\u6570\u636e\u67e5\u8be2\u6709\u597d\u5904\uff0c\u4f46\u5982\u679c\u4f60\u7684\u67e5\u8be2\u90fd\u662f\u5c0f\u6570\u636e\u67e5\u8be2\uff0c\u5c31\u5bb9\u6613\u9020\u6210\u5185\u5b58\u788e\u7247\u548c\u6d6a\u8d39\u3002\nquery_cache_size\uff1a\u67e5\u8be2\u7f13\u5b58\u5927\u5c0f (\u6ce8\uff1aQC\u5b58\u50a8\u7684\u6700\u5c0f\u5355\u4f4d\u662f1024byte\uff0c\u6240\u4ee5\u5982\u679c\u4f60\u8bbe\u5b9a\u4e86\u4e00\u4e2a\u4e0d\u662f1024\u7684\u500d\u6570\u7684\u503c\uff0c\u8fd9\u4e2a\u503c\u4f1a\u88ab\u56db\u820d\u4e94\u5165\u5230\u6700\u63a5\u8fd1\u5f53\u524d\u503c\u7684\u7b49\u4e8e1024\u7684\u500d\u6570\u7684\u503c\u3002)\n\nquery_cache_type\uff1a\u7f13\u5b58\u7c7b\u578b\uff0c\u51b3\u5b9a\u7f13\u5b58\u4ec0\u4e48\u6837\u7684\u67e5\u8be2\uff0c\u6ce8\u610f\u8fd9\u4e2a\u503c\u4e0d\u80fd\u968f\u4fbf\u8bbe\u7f6e\uff0c\u5fc5\u987b\u8bbe\u7f6e\u4e3a\u6570\u5b57\uff0c\u53ef\u9009\u9879\u76ee\u4ee5\u53ca\u8bf4\u660e\u5982\u4e0b\uff1a\n\u5982\u679c\u8bbe\u7f6e\u4e3a0\uff0c\u90a3\u4e48\u53ef\u4ee5\u8bf4\uff0c\u4f60\u7684\u7f13\u5b58\u6839\u672c\u5c31\u6ca1\u6709\u7528\uff0c\u76f8\u5f53\u4e8e\u7981\u7528\u4e86\u3002\n\u5982\u679c\u8bbe\u7f6e\u4e3a1\uff0c\u5c06\u4f1a\u7f13\u5b58\u6240\u6709\u7684\u7ed3\u679c\uff0c\u9664\u975e\u4f60\u7684select\u8bed\u53e5\u4f7f\u7528SQL_NO_CACHE\u7981\u7528\u4e86\u67e5\u8be2\u7f13\u5b58\u3002\n\u5982\u679c\u8bbe\u7f6e\u4e3a2\uff0c\u5219\u53ea\u7f13\u5b58\u5728select\u8bed\u53e5\u4e2d\u901a\u8fc7SQL_CACHE\u6307\u5b9a\u9700\u8981\u7f13\u5b58\u7684\u67e5\u8be2\u3002\n\n\u4fee\u6539\/etc\/my.cnf,\u914d\u7f6e\u5b8c\u540e\u7684\u90e8\u5206\u6587\u4ef6\u5982\u4e0b\uff1a\nquery_cache_size=128M\nquery_cache_type=1\n<\/code><\/pre>\n<h2>max_connect_errors ***<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">max_connect_errors\u662f\u4e00\u4e2amysql\u4e2d\u4e0e\u5b89\u5168\u6709\u5173\u7684\u8ba1\u6570\u5668\u503c\uff0c\u5b83\u8d1f\u8d23\u963b\u6b62\u8fc7\u591a\u5c1d\u8bd5\u5931\u8d25\u7684\u5ba2\u6237\u7aef\u4ee5\u9632\u6b62\u66b4\u529b\u7834\u89e3\u5bc6\u7801\u7b49\u60c5\u51b5\uff0c\u5f53\u8d85\u8fc7\u6307\u5b9a\u6b21\u6570\uff0cmysql\u670d\u52a1\u5668\u5c06\u7981\u6b62host\u7684\u8fde\u63a5\u8bf7\u6c42\uff0c\u76f4\u5230mysql\u670d\u52a1\u5668\u91cd\u542f\u6216\u901a\u8fc7flush hosts\u547d\u4ee4\u6e05\u7a7a\u6b64host\u7684\u76f8\u5173\u4fe1\u606f max_connect_errors\u7684\u503c\u4e0e\u6027\u80fd\u5e76\u65e0\u592a\u5927\u5173\u7cfb\u3002\n\u4fee\u6539\/etc\/my.cnf\u6587\u4ef6\uff0c\u5728[mysqld]\u4e0b\u9762\u6dfb\u52a0\u5982\u4e0b\u5185\u5bb9\nmax_connect_errors=2000\n<\/code><\/pre>\n<h2>sort_buffer_size ***<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-cpp\" lang=\"cpp\">\uff081\uff09\u7b80\u4ecb\uff1a\n\u6bcf\u4e2a\u9700\u8981\u8fdb\u884c\u6392\u5e8f\u7684\u7ebf\u7a0b\u5206\u914d\u8be5\u5927\u5c0f\u7684\u4e00\u4e2a\u7f13\u51b2\u533a\u3002\u589e\u52a0\u8fd9\u503c\u52a0\u901f\nORDER BY \nGROUP BY\ndistinct\nunion \n\n\uff082\uff09\u914d\u7f6e\u4f9d\u636e\nSort_Buffer_Size\u5e76\u4e0d\u662f\u8d8a\u5927\u8d8a\u597d\uff0c\u7531\u4e8e\u662fconnection\u7ea7\u7684\u53c2\u6570\uff0c\u8fc7\u5927\u7684\u8bbe\u7f6e+\u9ad8\u5e76\u53d1\u53ef\u80fd\u4f1a\u8017\u5c3d\u7cfb\u7edf\u5185\u5b58\u8d44\u6e90\u3002\n\u5217\u5982\uff1a500\u4e2a\u8fde\u63a5\u5c06\u4f1a\u6d88\u8017500*sort_buffer_size\uff082M\uff09=1G\u5185\u5b58\n\uff083\uff09\u914d\u7f6e\u65b9\u6cd5\n \u4fee\u6539\/etc\/my.cnf\u6587\u4ef6\uff0c\u5728[mysqld]\u4e0b\u9762\u6dfb\u52a0\u5982\u4e0b\uff1a\nsort_buffer_size=1M\n<\/code><\/pre>\n<h2>max_allowed_packet <strong>*<\/strong><\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\uff081\uff09\u7b80\u4ecb\uff1a\nmysql\u6839\u636e\u914d\u7f6e\u6587\u4ef6\u4f1a\u9650\u5236\uff0cserver\u63a5\u53d7\u7684\u6570\u636e\u5305\u5927\u5c0f\u3002\n\uff082\uff09\u914d\u7f6e\u4f9d\u636e\uff1a\n\u6709\u65f6\u5019\u5927\u7684\u63d2\u5165\u548c\u66f4\u65b0\u4f1a\u53d7max_allowed_packet\u53c2\u6570\u9650\u5236\uff0c\u5bfc\u81f4\u5199\u5165\u6216\u8005\u66f4\u65b0\u5931\u8d25\uff0c\u66f4\u5927\u503c\u662f1GB\uff0c\u5fc5\u987b\u8bbe\u7f6e1024\u7684\u500d\u6570\n\uff083\uff09\u914d\u7f6e\u65b9\u6cd5\uff1a\nmax_allowed_packet=32M\n<\/code><\/pre>\n<h2>join_buffer_size ***<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-csharp\" lang=\"csharp\">select a.name,b.name from a join b on a.id=b.id where xxxx\n\u7528\u4e8e\u8868\u95f4\u5173\u8054\u7f13\u5b58\u7684\u5927\u5c0f\uff0c\u548csort_buffer_size\u4e00\u6837\uff0c\u8be5\u53c2\u6570\u5bf9\u5e94\u7684\u5206\u914d\u5185\u5b58\u4e5f\u662f\u6bcf\u4e2a\u8fde\u63a5\u72ec\u4eab\u3002\n\u5c3d\u91cf\u5728SQL\u4e0e\u65b9\u9762\u8fdb\u884c\u4f18\u5316\uff0c\u6548\u679c\u8f83\u4e3a\u660e\u663e\u3002\n\u4f18\u5316\u7684\u65b9\u6cd5\uff1a\u5728on\u6761\u4ef6\u5217\u52a0\u7d22\u5f15\uff0c\u81f3\u5c11\u5e94\u5f53\u662f\u6709MUL\u7d22\u5f15\n<\/code><\/pre>\n<h2>thread_cache_size  <strong>*<\/strong><\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-ruby\" lang=\"ruby\">(1)\u7b80\u4ecb\n\u670d\u52a1\u5668\u7ebf\u7a0b\u7f13\u5b58\uff0c\u8fd9\u4e2a\u503c\u8868\u793a\u53ef\u4ee5\u91cd\u65b0\u5229\u7528\u4fdd\u5b58\u5728\u7f13\u5b58\u4e2d\u7ebf\u7a0b\u7684\u6570\u91cf,\u5f53\u65ad\u5f00\u8fde\u63a5\u65f6,\u90a3\u4e48\u5ba2\u6237\u7aef\u7684\u7ebf\u7a0b\u5c06\u88ab\u653e\u5230\u7f13\u5b58\u4e2d\u4ee5\u54cd\u5e94\u4e0b\u4e00\u4e2a\u5ba2\u6237\u800c\u4e0d\u662f\u9500\u6bc1(\u524d\u63d0\u662f\u7f13\u5b58\u6570\u672a\u8fbe\u4e0a\u9650),\u5982\u679c\u7ebf\u7a0b\u91cd\u65b0\u88ab\u8bf7\u6c42\uff0c\u90a3\u4e48\u8bf7\u6c42\u5c06\u4ece\u7f13\u5b58\u4e2d\u8bfb\u53d6,\u5982\u679c\u7f13\u5b58\u4e2d\u662f\u7a7a\u7684\u6216\u8005\u662f\u65b0\u7684\u8bf7\u6c42\uff0c\u90a3\u4e48\u8fd9\u4e2a\u7ebf\u7a0b\u5c06\u88ab\u91cd\u65b0\u521b\u5efa,\u5982\u679c\u6709\u5f88\u591a\u65b0\u7684\u7ebf\u7a0b\uff0c\u589e\u52a0\u8fd9\u4e2a\u503c\u53ef\u4ee5\u6539\u5584\u7cfb\u7edf\u6027\u80fd.\n\uff082\uff09\u914d\u7f6e\u4f9d\u636e\n\u901a\u8fc7\u6bd4\u8f83 Connections \u548c Threads_created \u72b6\u6001\u7684\u53d8\u91cf\uff0c\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a\u53d8\u91cf\u7684\u4f5c\u7528\u3002\n\u8bbe\u7f6e\u89c4\u5219\u5982\u4e0b\uff1a1GB \u5185\u5b58\u914d\u7f6e\u4e3a8\uff0c2GB\u914d\u7f6e\u4e3a16\uff0c3GB\u914d\u7f6e\u4e3a32\uff0c4GB\u6216\u66f4\u9ad8\u5185\u5b58\uff0c\u53ef\u914d\u7f6e\u66f4\u5927\u3002\n\u670d\u52a1\u5668\u5904\u7406\u6b64\u5ba2\u6237\u7684\u7ebf\u7a0b\u5c06\u4f1a\u7f13\u5b58\u8d77\u6765\u4ee5\u54cd\u5e94\u4e0b\u4e00\u4e2a\u5ba2\u6237\u800c\u4e0d\u662f\u9500\u6bc1(\u524d\u63d0\u662f\u7f13\u5b58\u6570\u672a\u8fbe\u4e0a\u9650)\n\n\u8bd5\u56fe\u8fde\u63a5\u5230MySQL(\u4e0d\u7ba1\u662f\u5426\u8fde\u63a5\u6210\u529f)\u7684\u8fde\u63a5\u6570\nmysql&gt;  show status like 'threads_%';\n+-------------------+-------+\n| Variable_name     | Value |\n+-------------------+-------+\n| Threads_cached    | 8     |\n| Threads_connected | 2     |\n| Threads_created   | 4783  |\n| Threads_running   | 1     |\n+-------------------+-------+\n4 rows in set (0.00 sec)\n\nThreads_cached :\u4ee3\u8868\u5f53\u524d\u6b64\u65f6\u6b64\u523b\u7ebf\u7a0b\u7f13\u5b58\u4e2d\u6709\u591a\u5c11\u7a7a\u95f2\u7ebf\u7a0b\u3002\nThreads_connected:\u4ee3\u8868\u5f53\u524d\u5df2\u5efa\u7acb\u8fde\u63a5\u7684\u6570\u91cf\uff0c\u56e0\u4e3a\u4e00\u4e2a\u8fde\u63a5\u5c31\u9700\u8981\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u6240\u4ee5\u4e5f\u53ef\u4ee5\u770b\u6210\u5f53\u524d\u88ab\u4f7f\u7528\u7684\u7ebf\u7a0b\u6570\u3002\nThreads_created:\u4ee3\u8868\u4ece\u6700\u8fd1\u4e00\u6b21\u670d\u52a1\u542f\u52a8\uff0c\u5df2\u521b\u5efa\u7ebf\u7a0b\u7684\u6570\u91cf\uff0c\u5982\u679c\u53d1\u73b0Threads_created\u503c\u8fc7\u5927\u7684\u8bdd\uff0c\u8868\u660eMySQL\u670d\u52a1\u5668\u4e00\u76f4\u5728\u521b\u5efa\u7ebf\u7a0b\uff0c\u8fd9\u4e5f\u662f\u6bd4\u8f83\u8017cpu SYS\u8d44\u6e90\uff0c\u53ef\u4ee5\u9002\u5f53\u589e\u52a0\u914d\u7f6e\u6587\u4ef6\u4e2dthread_cache_size\u503c\u3002\nThreads_running :\u4ee3\u8868\u5f53\u524d\u6fc0\u6d3b\u7684\uff08\u975e\u7761\u7720\u72b6\u6001\uff09\u7ebf\u7a0b\u6570\u3002\u5e76\u4e0d\u662f\u4ee3\u8868\u6b63\u5728\u4f7f\u7528\u7684\u7ebf\u7a0b\u6570\uff0c\u6709\u65f6\u5019\u8fde\u63a5\u5df2\u5efa\u7acb\uff0c\u4f46\u662f\u8fde\u63a5\u5904\u4e8esleep\u72b6\u6001\u3002\n(3)\u914d\u7f6e\u65b9\u6cd5\uff1a\nthread_cache_size=32\n\n\u6574\u7406\uff1a\nThreads_created  \uff1a\u4e00\u822c\u5728\u67b6\u6784\u8bbe\u8ba1\u9636\u6bb5\uff0c\u4f1a\u8bbe\u7f6e\u4e00\u4e2a\u6d4b\u8bd5\u503c\uff0c\u505a\u538b\u529b\u6d4b\u8bd5\u3002\n\u7ed3\u5408zabbix\u76d1\u63a7\uff0c\u770b\u4e00\u6bb5\u65f6\u95f4\u5185\u6b64\u72b6\u6001\u7684\u53d8\u5316\u3002\n\u5982\u679c\u5728\u4e00\u6bb5\u65f6\u95f4\u5185\uff0cThreads_created\u8d8b\u4e8e\u5e73\u7a33\uff0c\u8bf4\u660e\u5bf9\u5e94\u53c2\u6570\u8bbe\u5b9a\u662fOK\u3002\n\u5982\u679c\u4e00\u76f4\u9661\u5ced\u7684\u589e\u957f\uff0c\u6216\u8005\u51fa\u73b0\u5927\u91cf\u5cf0\u503c\uff0c\u90a3\u4e48\u7ee7\u7eed\u589e\u52a0\u6b64\u503c\u7684\u5927\u5c0f\uff0c\u5728\u7cfb\u7edf\u8d44\u6e90\u591f\u7528\u7684\u60c5\u51b5\u4e0b\uff08\u5185\u5b58\uff09\n<\/code><\/pre>\n<h2>innodb_buffer_pool_size  <strong>*<\/strong><\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\uff081\uff09\u7b80\u4ecb\n\u5bf9\u4e8eInnoDB\u8868\u6765\u8bf4\uff0cinnodb_buffer_pool_size\u7684\u4f5c\u7528\u5c31\u76f8\u5f53\u4e8ekey_buffer_size\u5bf9\u4e8eMyISAM\u8868\u7684\u4f5c\u7528\u4e00\u6837\u3002\n\uff082\uff09\u914d\u7f6e\u4f9d\u636e\uff1a\nInnoDB\u4f7f\u7528\u8be5\u53c2\u6570\u6307\u5b9a\u5927\u5c0f\u7684\u5185\u5b58\u6765\u7f13\u51b2\u6570\u636e\u548c\u7d22\u5f15\u3002\n\u5bf9\u4e8e\u5355\u72ec\u7684MySQL\u6570\u636e\u5e93\u670d\u52a1\u5668\uff0c\u6700\u5927\u53ef\u4ee5\u628a\u8be5\u503c\u8bbe\u7f6e\u6210\u7269\u7406\u5185\u5b58\u768480%,\u4e00\u822c\u6211\u4eec\u5efa\u8bae\u4e0d\u8981\u8d85\u8fc7\u7269\u7406\u5185\u5b58\u768470%\u3002\u9ed8\u8ba4128M\n\uff083\uff09\u914d\u7f6e\u65b9\u6cd5\ninnodb_buffer_pool_size=2048M\n<\/code><\/pre>\n<h2>innodb_flush_log_at_trx_commit <strong>**<\/strong><\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-shell\" lang=\"shell\">\uff081\uff09\u7b80\u4ecb\n\u4e3b\u8981\u63a7\u5236\u4e86innodb\u5c06log buffer\u4e2d\u7684\u6570\u636e\u5199\u5165\u65e5\u5fd7\u6587\u4ef6\u5e76flush\u78c1\u76d8\u7684\u65f6\u95f4\u70b9\uff0c\u53d6\u503c\u5206\u522b\u4e3a0\u30011\u30012\u4e09\u4e2a\u3002\n0\uff0c\u8868\u793a\u5f53\u4e8b\u52a1\u63d0\u4ea4\u65f6\uff0c\u4e0d\u505a\u65e5\u5fd7\u5199\u5165\u64cd\u4f5c\uff0c\u800c\u662f\u6bcf\u79d2\u949f\u5c06log buffer\u4e2d\u7684\u6570\u636e\u5199\u5165\u65e5\u5fd7\u6587\u4ef6\u5e76flush\u78c1\u76d8\u4e00\u6b21\uff1b\n1\uff0c\n\u6bcf\u6b21\u4e8b\u52a1\u7684\u63d0\u4ea4\u90fd\u4f1a\u5f15\u8d77redo\u65e5\u5fd7\u6587\u4ef6\u5199\u5165\u3001flush\u78c1\u76d8\u7684\u64cd\u4f5c\uff0c\u786e\u4fdd\u4e86\u4e8b\u52a1\u7684ACID\uff1b\n2\uff0c\u6bcf\u6b21\u4e8b\u52a1\u63d0\u4ea4\u5f15\u8d77\u5199\u5165\u65e5\u5fd7\u6587\u4ef6\u7684\u52a8\u4f5c,\u4f46\u6bcf\u79d2\u949f\u5b8c\u6210\u4e00\u6b21flush\u78c1\u76d8\u64cd\u4f5c\u3002\n\n\uff082\uff09\u914d\u7f6e\u4f9d\u636e\n\u5b9e\u9645\u6d4b\u8bd5\u53d1\u73b0\uff0c\u8be5\u503c\u5bf9\u63d2\u5165\u6570\u636e\u7684\u901f\u5ea6\u5f71\u54cd\u975e\u5e38\u5927\uff0c\u8bbe\u7f6e\u4e3a2\u65f6\u63d2\u516510000\u6761\u8bb0\u5f55\u53ea\u9700\u89812\u79d2\uff0c\u8bbe\u7f6e\u4e3a0\u65f6\u53ea\u9700\u89811\u79d2\uff0c\u800c\u8bbe\u7f6e\u4e3a1\u65f6\u5219\u9700\u8981229\u79d2\u3002\u56e0\u6b64\uff0cMySQL\u624b\u518c\u4e5f\u5efa\u8bae\u5c3d\u91cf\u5c06\u63d2\u5165\u64cd\u4f5c\u5408\u5e76\u6210\u4e00\u4e2a\u4e8b\u52a1\uff0c\u8fd9\u6837\u53ef\u4ee5\u5927\u5e45\u63d0\u9ad8\u901f\u5ea6\u3002\n\u6839\u636eMySQL\u5b98\u65b9\u6587\u6863\uff0c\u5728\u5141\u8bb8\u4e22\u5931\u6700\u8fd1\u90e8\u5206\u4e8b\u52a1\u7684\u5371\u9669\u7684\u524d\u63d0\u4e0b\uff0c\u53ef\u4ee5\u628a\u8be5\u503c\u8bbe\u4e3a0\u62162\u3002\n\uff083\uff09\u914d\u7f6e\u65b9\u6cd5\ninnodb_flush_log_at_trx_commit=1\n\u53cc1\u6807\u51c6\u4e2d\u7684\u4e00\u4e2a1\n<\/code><\/pre>\n<h2>innodb_thread_concurrency  ***<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-dart\" lang=\"dart\">\uff081\uff09\u7b80\u4ecb\n\u6b64\u53c2\u6570\u7528\u6765\u8bbe\u7f6einnodb\u7ebf\u7a0b\u7684\u5e76\u53d1\u6570\u91cf\uff0c\u9ed8\u8ba4\u503c\u4e3a0\u8868\u793a\u4e0d\u9650\u5236\u3002\n\uff082\uff09\u914d\u7f6e\u4f9d\u636e\n\u5728\u5b98\u65b9doc\u4e0a\uff0c\u5bf9\u4e8einnodb_thread_concurrency\u7684\u4f7f\u7528\uff0c\u4e5f\u7ed9\u51fa\u4e86\u4e00\u4e9b\u5efa\u8bae\uff0c\u5982\u4e0b\uff1a\n\u5982\u679c\u4e00\u4e2a\u5de5\u4f5c\u8d1f\u8f7d\u4e2d\uff0c\u5e76\u53d1\u7528\u6237\u7ebf\u7a0b\u7684\u6570\u91cf\u5c0f\u4e8e64\uff0c\u5efa\u8bae\u8bbe\u7f6einnodb_thread_concurrency=0\uff1b\n\u5982\u679c\u5de5\u4f5c\u8d1f\u8f7d\u4e00\u76f4\u8f83\u4e3a\u4e25\u91cd\u751a\u81f3\u5076\u5c14\u8fbe\u5230\u9876\u5cf0\uff0c\u5efa\u8bae\u5148\u8bbe\u7f6einnodb_thread_concurrency=128\uff0c\n\u5e76\u901a\u8fc7\u4e0d\u65ad\u7684\u964d\u4f4e\u8fd9\u4e2a\u53c2\u6570\uff0c96, 80, 64\u7b49\u7b49\uff0c\u76f4\u5230\u53d1\u73b0\u80fd\u591f\u63d0\u4f9b\u6700\u4f73\u6027\u80fd\u7684\u7ebf\u7a0b\u6570\uff0c\n\u4f8b\u5982\uff0c\u5047\u8bbe\u7cfb\u7edf\u901a\u5e38\u670940\u523050\u4e2a\u7528\u6237\uff0c\u4f46\u5b9a\u671f\u7684\u6570\u91cf\u589e\u52a0\u81f360\uff0c70\uff0c\u751a\u81f3200\u3002\u4f60\u4f1a\u53d1\u73b0\uff0c\n\u6027\u80fd\u572880\u4e2a\u5e76\u53d1\u7528\u6237\u8bbe\u7f6e\u65f6\u8868\u73b0\u7a33\u5b9a\uff0c\u5982\u679c\u9ad8\u4e8e\u8fd9\u4e2a\u6570\uff0c\u6027\u80fd\u53cd\u800c\u4e0b\u964d\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\n\u5efa\u8bae\u8bbe\u7f6einnodb_thread_concurrency\u53c2\u6570\u4e3a80\uff0c\u4ee5\u907f\u514d\u5f71\u54cd\u6027\u80fd\u3002\n\u5982\u679c\u4f60\u4e0d\u5e0c\u671bInnoDB\u4f7f\u7528\u7684\u865a\u62dfCPU\u6570\u91cf\u6bd4\u7528\u6237\u7ebf\u7a0b\u4f7f\u7528\u7684\u865a\u62dfCPU\u66f4\u591a\uff08\u6bd4\u598220\u4e2a\u865a\u62dfCPU\uff09\uff0c\n\u5efa\u8bae\u901a\u8fc7\u8bbe\u7f6einnodb_thread_concurrency \u53c2\u6570\u4e3a\u8fd9\u4e2a\u503c\uff08\u4e5f\u53ef\u80fd\u66f4\u4f4e\uff0c\u8fd9\u53d6\u51b3\u4e8e\u6027\u80fd\u4f53\u73b0\uff09\uff0c\n\u5982\u679c\u4f60\u7684\u76ee\u6807\u662f\u5c06MySQL\u4e0e\u5176\u4ed6\u5e94\u7528\u9694\u79bb\uff0c\u4f60\u53ef\u4ee5l\u8003\u8651\u7ed1\u5b9amysqld\u8fdb\u7a0b\u5230\u4e13\u6709\u7684\u865a\u62dfCPU\u3002\n\u4f46\u662f\u9700 \u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fd9\u79cd\u7ed1\u5b9a\uff0c\u5728myslqd\u8fdb\u7a0b\u4e00\u76f4\u4e0d\u662f\u5f88\u5fd9\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u975e\u6700\u4f18\u7684\u786c\u4ef6\u4f7f\u7528\u7387\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\n\u4f60\u53ef\u80fd\u4f1a\u8bbe\u7f6emysqld\u8fdb\u7a0b\u7ed1\u5b9a\u7684\u865a\u62df CPU\uff0c\u5141\u8bb8\u5176\u4ed6\u5e94\u7528\u7a0b\u5e8f\u4f7f\u7528\u865a\u62dfCPU\u7684\u4e00\u90e8\u5206\u6216\u5168\u90e8\u3002\n\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6700\u4f73\u7684innodb_thread_concurrency\u53c2\u6570\u8bbe\u7f6e\u53ef\u4ee5\u6bd4\u865a\u62dfCPU\u7684\u6570\u91cf\u5c0f\u3002\n\u5b9a\u671f\u68c0\u6d4b\u548c\u5206\u6790\u7cfb\u7edf\uff0c\u8d1f\u8f7d\u91cf\u3001\u7528\u6237\u6570\u6216\u8005\u5de5\u4f5c\u73af\u5883\u7684\u6539\u53d8\u53ef\u80fd\u90fd\u9700\u8981\u5bf9innodb_thread_concurrency\u53c2\u6570\u7684\u8bbe\u7f6e\u8fdb\u884c\u8c03\u6574\u3002\n\n128   -----&gt; top  cpu  \n\u8bbe\u7f6e\u6807\u51c6\uff1a\n1\u3001\u5f53\u524d\u7cfb\u7edfcpu\u4f7f\u7528\u60c5\u51b5\uff0c\u5747\u4e0d\u5747\u5300\ntop\n\n2\u3001\u5f53\u524d\u7684\u8fde\u63a5\u6570\uff0c\u6709\u6ca1\u6709\u8fbe\u5230\u9876\u5cf0\nshow status like 'threads_%';\nshow processlist;\n\uff083\uff09\u914d\u7f6e\u65b9\u6cd5\uff1a\ninnodb_thread_concurrency=8\n\u65b9\u6cd5:\n    1. \u770btop ,\u89c2\u5bdf\u6bcf\u4e2acpu\u7684\u5404\u81ea\u7684\u8d1f\u8f7d\u60c5\u51b5\n    2. \u53d1\u73b0\u4e0d\u5e73\u5747,\u5148\u8bbe\u7f6e\u53c2\u6570\u4e3acpu\u4e2a\u6570,\u7136\u540e\u4e0d\u65ad\u589e\u52a0(\u4e00\u500d)\u8fd9\u4e2a\u6570\u503c\n    3. \u4e00\u76f4\u89c2\u5bdftop\u72b6\u6001,\u76f4\u5230\u8fbe\u5230\u6bd4\u8f83\u5747\u5300\u65f6,\u8bf4\u660e\u5df2\u7ecf\u5230\u4f4d\u4e86.\n<\/code><\/pre>\n<h2>innodb_log_buffer_size<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-objectivec\" lang=\"objectivec\">\u6b64\u53c2\u6570\u786e\u5b9a\u4e9b\u65e5\u5fd7\u6587\u4ef6\u6240\u7528\u7684\u5185\u5b58\u5927\u5c0f\uff0c\u4ee5M\u4e3a\u5355\u4f4d\u3002\u7f13\u51b2\u533a\u66f4\u5927\u80fd\u63d0\u9ad8\u6027\u80fd\uff0c\u5bf9\u4e8e\u8f83\u5927\u7684\u4e8b\u52a1\uff0c\u53ef\u4ee5\u589e\u5927\u7f13\u5b58\u5927\u5c0f\u3002\ninnodb_log_buffer_size=128M\n\n\u8bbe\u5b9a\u4f9d\u636e\uff1a\n1\u3001\u5927\u4e8b\u52a1\uff1a \u5b58\u50a8\u8fc7\u7a0b\u8c03\u7528 CALL\n2\u3001\u591a\u4e8b\u52a1\n<\/code><\/pre>\n<h2>innodb_log_file_size = 100M    <strong>*<\/strong><\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u8bbe\u7f6e ib_logfile0  ib_logfile1 \n\u6b64\u53c2\u6570\u786e\u5b9a\u6570\u636e\u65e5\u5fd7\u6587\u4ef6\u7684\u5927\u5c0f\uff0c\u4ee5M\u4e3a\u5355\u4f4d\uff0c\u66f4\u5927\u7684\u8bbe\u7f6e\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd.\ninnodb_log_file_size = 100M\n<\/code><\/pre>\n<h2>innodb_log_files_in_group = 3  <strong>*<\/strong><\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u4e3a\u63d0\u9ad8\u6027\u80fd\uff0cMySQL\u53ef\u4ee5\u4ee5\u5faa\u73af\u65b9\u5f0f\u5c06\u65e5\u5fd7\u6587\u4ef6\u5199\u5230\u591a\u4e2a\u6587\u4ef6\u3002\u63a8\u8350\u8bbe\u7f6e\u4e3a3\n<\/code><\/pre>\n<h2>read_buffer_size = 1M  **<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">MySql\u8bfb\u5165\u7f13\u51b2\u533a\u5927\u5c0f\u3002\u5bf9\u8868\u8fdb\u884c\u987a\u5e8f\u626b\u63cf\u7684\u8bf7\u6c42\u5c06\u5206\u914d\u4e00\u4e2a\u8bfb\u5165\u7f13\u51b2\u533a\uff0cMySql\u4f1a\u4e3a\u5b83\u5206\u914d\u4e00\u6bb5\u5185\u5b58\u7f13\u51b2\u533a\u3002\u5982\u679c\u5bf9\u8868\u7684\u987a\u5e8f\u626b\u63cf\u8bf7\u6c42\u975e\u5e38\u9891\u7e41\uff0c\u5e76\u4e14\u4f60\u8ba4\u4e3a\u9891\u7e41\u626b\u63cf\u8fdb\u884c\u5f97\u592a\u6162\uff0c\u53ef\u4ee5\u901a\u8fc7\u589e\u52a0\u8be5\u53d8\u91cf\u503c\u4ee5\u53ca\u5185\u5b58\u7f13\u51b2\u533a\u5927\u5c0f\u63d0\u9ad8\u5176\u6027\u80fd\u3002\u548c sort_buffer_size\u4e00\u6837\uff0c\u8be5\u53c2\u6570\u5bf9\u5e94\u7684\u5206\u914d\u5185\u5b58\u4e5f\u662f\u6bcf\u4e2a\u8fde\u63a5\u72ec\u4eab\n<\/code><\/pre>\n<h2>read_rnd_buffer_size = 1M **<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">MySql\u7684\u968f\u673a\u8bfb\uff08\u67e5\u8be2\u64cd\u4f5c\uff09\u7f13\u51b2\u533a\u5927\u5c0f\u3002\u5f53\u6309\u4efb\u610f\u987a\u5e8f\u8bfb\u53d6\u884c\u65f6(\u4f8b\u5982\uff0c\u6309\u7167\u6392\u5e8f\u987a\u5e8f)\uff0c\u5c06\u5206\u914d\u4e00\u4e2a\u968f\u673a\u8bfb\u7f13\u5b58\u533a\u3002\u8fdb\u884c\u6392\u5e8f\u67e5\u8be2\u65f6\uff0cMySql\u4f1a\u9996\u5148\u626b\u63cf\u4e00\u904d\u8be5\u7f13\u51b2\uff0c\u4ee5\u907f\u514d\u78c1\u76d8\u641c\u7d22\uff0c\u63d0\u9ad8\u67e5\u8be2\u901f\u5ea6\uff0c\u5982\u679c\u9700\u8981\u6392\u5e8f\u5927\u91cf\u6570\u636e\uff0c\u53ef\u9002\u5f53\u8c03\u9ad8\u8be5\u503c\u3002\u4f46MySql\u4f1a\u4e3a\u6bcf\u4e2a\u5ba2\u6237\u8fde\u63a5\u53d1\u653e\u8be5\u7f13\u51b2\u7a7a\u95f4\uff0c\u6240\u4ee5\u5e94\u5c3d\u91cf\u9002\u5f53\u8bbe\u7f6e\u8be5\u503c\uff0c\u4ee5\u907f\u514d\u5185\u5b58\u5f00\u9500\u8fc7\u5927\u3002\n\u6ce8\uff1a\u987a\u5e8f\u8bfb\u662f\u6307\u6839\u636e\u7d22\u5f15\u7684\u53f6\u8282\u70b9\u6570\u636e\u5c31\u80fd\u987a\u5e8f\u5730\u8bfb\u53d6\u6240\u9700\u8981\u7684\u884c\u6570\u636e\u3002\u968f\u673a\u8bfb\u662f\u6307\u4e00\u822c\u9700\u8981\u6839\u636e\u8f85\u52a9\u7d22\u5f15\u53f6\u8282\u70b9\u4e2d\u7684\u4e3b\u952e\u5bfb\u627e\u5b9e\u9645\u884c\u6570\u636e\uff0c\u800c\u8f85\u52a9\u7d22\u5f15\u548c\u4e3b\u952e\u6240\u5728\u7684\u6570\u636e\u6bb5\u4e0d\u540c\uff0c\u56e0\u6b64\u8bbf\u95ee\u65b9\u5f0f\u662f\u968f\u673a\u7684\u3002\n<\/code><\/pre>\n<h2>bulk_insert_buffer_size = 8M **<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u6279\u91cf\u63d2\u5165\u6570\u636e\u7f13\u5b58\u5927\u5c0f\uff0c\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u63d2\u5165\u6548\u7387\uff0c\u9ed8\u8ba4\u4e3a8M\ntokuDB    percona\nmyrocks   \nRocksDB\nTiDB\nMongoDB\n<\/code><\/pre>\n<h2>binary log  <strong>*<\/strong><\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-kotlin\" lang=\"kotlin\">log-bin=\/data\/mysql-bin\nbinlog_cache_size = 2M \/\/\u4e3a\u6bcf\u4e2asession \u5206\u914d\u7684\u5185\u5b58\uff0c\u5728\u4e8b\u52a1\u8fc7\u7a0b\u4e2d\u7528\u6765\u5b58\u50a8\u4e8c\u8fdb\u5236\u65e5\u5fd7\u7684\u7f13\u5b58, \u63d0\u9ad8\u8bb0\u5f55bin-log\u7684\u6548\u7387\u3002\u6ca1\u6709\u4ec0\u4e48\u5927\u4e8b\u52a1\uff0cdml\u4e5f\u4e0d\u662f\u5f88\u9891\u7e41\u7684\u60c5\u51b5\u4e0b\u53ef\u4ee5\u8bbe\u7f6e\u5c0f\u4e00\u70b9\uff0c\u5982\u679c\u4e8b\u52a1\u5927\u800c\u4e14\u591a\uff0cdml\u64cd\u4f5c\u4e5f\u9891\u7e41\uff0c\u5219\u53ef\u4ee5\u9002\u5f53\u7684\u8c03\u5927\u4e00\u70b9\u3002\u524d\u8005\u5efa\u8bae\u662f--1M\uff0c\u540e\u8005\u5efa\u8bae\u662f\uff1a\u5373 2--4M\nmax_binlog_cache_size = 8M \/\/\u8868\u793a\u7684\u662fbinlog \u80fd\u591f\u4f7f\u7528\u7684\u6700\u5927cache \u5185\u5b58\u5927\u5c0f\nmax_binlog_size= 512M \/\/\u6307\u5b9abinlog\u65e5\u5fd7\u6587\u4ef6\u7684\u5927\u5c0f\uff0c\u5982\u679c\u5f53\u524d\u7684\u65e5\u5fd7\u5927\u5c0f\u8fbe\u5230max_binlog_size\uff0c\u8fd8\u4f1a\u81ea\u52a8\u521b\u5efa\u65b0\u7684\u4e8c\u8fdb\u5236\u65e5\u5fd7\u3002\u4f60\u4e0d\u80fd\u5c06\u8be5\u53d8\u91cf\u8bbe\u7f6e\u4e3a\u5927\u4e8e1GB\u6216\u5c0f\u4e8e4096\u5b57\u8282\u3002\u9ed8\u8ba4\u503c\u662f1GB\u3002\u5728\u5bfc\u5165\u5927\u5bb9\u91cf\u7684sql\u6587\u4ef6\u65f6\uff0c\u5efa\u8bae\u5173\u95edsql_log_bin\uff0c\u5426\u5219\u786c\u76d8\u625b\u4e0d\u4f4f\uff0c\u800c\u4e14\u5efa\u8bae\u5b9a\u671f\u505a\u5220\u9664\u3002\nexpire_logs_days = 7 \/\/\u5b9a\u4e49\u4e86mysql\u6e05\u9664\u8fc7\u671f\u65e5\u5fd7\u7684\u65f6\u95f4\u3002\n\u4e8c\u8fdb\u5236\u65e5\u5fd7\u81ea\u52a8\u5220\u9664\u7684\u5929\u6570\u3002\u9ed8\u8ba4\u503c\u4e3a0,\u8868\u793a\u201c\u6ca1\u6709\u81ea\u52a8\u5220\u9664\u201d\u3002\nlog-bin=\/data\/mysql-bin\nbinlog_format=row \nsync_binlog=1\n\u53cc1\u6807\u51c6(\u57fa\u4e8e\u5b89\u5168\u7684\u63a7\u5236)\uff1a\nsync_binlog=1   \u4ec0\u4e48\u65f6\u5019\u5237\u65b0binlog\u5230\u78c1\u76d8\uff0c\u6bcf\u6b21\u4e8b\u52a1commit\ninnodb_flush_log_at_trx_commit=1\nset sql_log_bin=0;\nshow status like 'com_%';\n<\/code><\/pre>\n<h2>\u5b89\u5168\u53c2\u6570  <strong>*<\/strong><\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-ruby\" lang=\"ruby\">Innodb_flush_method=(O_DIRECT, fsync) \n1\u3001fsync    \uff1a\n\uff081\uff09\u5728\u6570\u636e\u9875\u9700\u8981\u6301\u4e45\u5316\u65f6\uff0c\u9996\u5148\u5c06\u6570\u636e\u5199\u5165OS buffer\u4e2d\uff0c\u7136\u540e\u7531os\u51b3\u5b9a\u4ec0\u4e48\u65f6\u5019\u5199\u5165\u78c1\u76d8\n\uff082\uff09\u5728redo buffuer\u9700\u8981\u6301\u4e45\u5316\u65f6\uff0c\u9996\u5148\u5c06\u6570\u636e\u5199\u5165OS buffer\u4e2d\uff0c\u7136\u540e\u7531os\u51b3\u5b9a\u4ec0\u4e48\u65f6\u5019\u5199\u5165\u78c1\u76d8\n\u4f46\uff0c\u5982\u679cinnodb_flush_log_at_trx_commit=1\u7684\u8bdd\uff0c\u65e5\u5fd7\u8fd8\u662f\u76f4\u63a5\u6bcf\u6b21commit\u76f4\u63a5\u5199\u5165\u78c1\u76d8\n2\u3001 Innodb_flush_method=O_DIRECT\n\uff081\uff09\u5728\u6570\u636e\u9875\u9700\u8981\u6301\u4e45\u5316\u65f6\uff0c\u76f4\u63a5\u5199\u5165\u78c1\u76d8\n\uff082\uff09\u5728redo buffuer\u9700\u8981\u6301\u4e45\u5316\u65f6\uff0c\u9996\u5148\u5c06\u6570\u636e\u5199\u5165OS buffer\u4e2d\uff0c\u7136\u540e\u7531os\u51b3\u5b9a\u4ec0\u4e48\u65f6\u5019\u5199\u5165\u78c1\u76d8\n\u4f46\uff0c\u5982\u679cinnodb_flush_log_at_trx_commit=1\u7684\u8bdd\uff0c\u65e5\u5fd7\u8fd8\u662f\u76f4\u63a5\u6bcf\u6b21commit\u76f4\u63a5\u5199\u5165\u78c1\u76d8\n\n\u6700\u5b89\u5168\u6a21\u5f0f\uff1a\ninnodb_flush_log_at_trx_commit=1\ninnodb_flush_method=O_DIRECT\n\u6700\u9ad8\u6027\u80fd\u6a21\u5f0f\uff1a\ninnodb_flush_log_at_trx_commit=0\ninnodb_flush_method=fsync\n        \n\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u66f4\u504f\u5411\u4e8e\u5b89\u5168\u3002 \n\u201c\u53cc\u4e00\u6807\u51c6\u201d\ninnodb_flush_log_at_trx_commit=1        ***************\nsync_binlog=1                                   ***************\ninnodb_flush_method=O_DIRECT\n<\/code><\/pre>\n<h1>6. \u53c2\u6570\u4f18\u5316\u7ed3\u679c<\/h1>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-tsx\" lang=\"tsx\">[mysqld]\nbasedir=\/data\/mysql\ndatadir=\/data\/mysql\/data\nsocket=\/tmp\/mysql.sock\nlog-error=\/var\/log\/mysql.log\nlog_bin=\/data\/binlog\/mysql-bin\nbinlog_format=row\nskip-name-resolve\nserver-id=52\ngtid-mode=on\nenforce-gtid-consistency=true\nlog-slave-updates=1\nrelay_log_purge=0\nmax_connections=1024\nback_log=128\nwait_timeout=60\ninteractive_timeout=7200\nkey_buffer_size=16M\nquery_cache_size=64M\nquery_cache_type=1\nquery_cache_limit=50M\nmax_connect_errors=20\nsort_buffer_size=2M\nmax_allowed_packet=32M\njoin_buffer_size=2M\nthread_cache_size=200\ninnodb_buffer_pool_size=1024M\ninnodb_flush_log_at_trx_commit=1\ninnodb_log_buffer_size=32M\ninnodb_log_file_size=128M\ninnodb_log_files_in_group=3\nbinlog_cache_size=2M\nmax_binlog_cache_size=8M\nmax_binlog_size=512M\nexpire_logs_days=7\nread_buffer_size=2M\nread_rnd_buffer_size=2M\nbulk_insert_buffer_size=8M\n[client]\nsocket=\/tmp\/mysql.sock  \n        \n\u518d\u6b21\u538b\u529b\u6d4b\u8bd5  \uff1a\n mysqlslap --defaults-file=\/etc\/my.cnf --concurrency=100 --iterations=1 --create-schema='oldboy' --query=\"select * from oldboy.t_100w where k2='FGCD'\" engine=innodb --number-of-queries=200000 -uroot -p123 -verbose\n<\/code><\/pre>\n<h1>7. \u9501\u7684\u76d1\u63a7\u53ca\u5904\u7406<\/h1>\n<h2>7.1 \u9501\u7b49\u5f85\u6a21\u62df<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u6982\u5ff5\uff1a\nRecord Lock \nNext Lock \nGAP Lock\nX \nIX\nS \nIS\n<\/code><\/pre>\n<h2>tx1:<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-php\" lang=\"php\">USE oldboy\nUPDATE t_100w SET k1='av' WHERE id=10;\n## tx2:\nUSE oldboy \nUPDATE  t_100w SET k1='az' WHERE id=10;\n<\/code><\/pre>\n<h2>\u76d1\u63a7\u9501\u72b6\u6001<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/\/\/upload-images.jianshu.io\/upload_images\/16956686-9e1bcd370862c1fa.png?imageMogr2\/auto-orient\/strip|imageView2\/2\/w\/1200\/format\/webp\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>image.png<\/p>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-php\" lang=\"php\">## 1. \u770b\u6709\u6ca1\u6709\u9501\u7b49\u5f85\nSHOW  STATUS LIKE 'innodb_row_lock%';\n---\u5173\u6ce8\u70b9:\nInnodb_row_lock_current_waits :\u5f53\u524d\u6709\u591a\u5c11\u9501\u7b49\u5f85\nInnodb_row_lock_waits\t\t  :\u81ea\u6570\u636e\u5e93\u542f\u52a8\uff0c\u4e00\u5171\u53d1\u751f\u591a\u5c11\u9501\u7b49\u5f85\n\n\n## 2. \u67e5\u770b\u54ea\u4e2a\u4e8b\u52a1\u5728\u7b49\u5f85(\u88ab\u963b\u585e\u4e86)\nUSE information_schema\nSELECT * FROM information_schema.INNODB_TRX WHERE trx_state='LOCK WAIT';\n\ntrx_id : \u88ab\u963b\u585e\u4e8b\u52a1ID\u53f7\ntrx_state : \u5f53\u524d\u4e8b\u52a1\u7684\u72b6\u6001\ntrx_mysql_thread_id:\u8fde\u63a5\u5c42\u7684,\u8fde\u63a5\u7ebf\u7a0bID(SHOW PROCESSLIST ===&gt;Id\u6216trx_id )\ntrx_query : \u5f53\u524d\u88ab\u963b\u585e\u7684\u64cd\u4f5c(\u4e00\u822c\u662f\u8981\u4e22\u7ed9\u5f00\u53d1\u7684)\n<\/code><\/pre>\n<h2>7.3.\u67e5\u770b\u9501\u6e90,\u8c01\u9501\u7684\u6211!<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-shell\" lang=\"shell\">SELECT * FROM sys.innodb_lock_waits;     ## ====&gt;\u88ab\u9501\u7684\u548c\u9501\u5b9a\u5b83\u7684\u4e4b\u95f4\u5173\u7cfb\n\nlocked_table : \u4ea7\u751f\u9501\u7b49\u5f85\u7684\u8868\nlocked_type:\u9501\u7c7b\u578b\uff08recordlock\uff0cgaplock\uff0cnextlock\uff09\nwaiting_trx_id: \u7b49\u5f85\u7684\u4e8b\u52a1id(\u4e0e\u4e0a\u4e2a\u89c6\u56fetrx_id \u5bf9\u5e94)\nwaiting_pid   : \u7b49\u5f85\u7684\u4e8b\u52a1\u7684\u7ebf\u7a0b\u53f7(\u4e0e\u4e0a\u4e2a\u89c6\u56fetrx_mysql_thread_id)\nwaiting_query:\u5f53\u524d\u88ab\u963b\u585e\u7684\u64cd\u4f5c\nwaiting_lock_mode:\u7b49\u5f85\u7684\u7684\u5b9a\u7c7b\u578b\uff08X,S\uff09\nblocking_trx_id : \u9501\u6e90\u7684\u4e8b\u52a1ID \nblocking_pid    : \u9501\u6e90\u7684\u4e8b\u52a1\u8fde\u63a5\u7ebf\u7a0b\u53f7\nsql_kill_blocking_connection:\u5904\u7406\u5efa\u8bae\n<\/code><\/pre>\n<h2>7.4. \u627e\u5230\u9501\u6e90\u7684thread_id<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">SELECT \n    thread_id,\n    NAME,\n    processlist_id\n    FROM performance_schema.threads WHERE processlist_id=15;\n\n====&gt; 41\n<\/code><\/pre>\n<h2>7.5. \u627e\u5230\u9501\u6e90\u7684SQL\u8bed\u53e5<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">-- \u5f53\u524d\u5728\u6267\u884c\u7684\u8bed\u53e5\nSELECT \n\tthread_id,\n    event_name,\n    SQL_text\n\tFROM performance_schema.`events_statements_current` WHERE thread_id=41;\n\n-- \u6267\u884c\u8bed\u53e5\u7684\u5386\u53f2\nSELECT * FROM performance_schema.`events_statements_history` WHERE thread_id=41;\n\n\u5f97\u51fa\u7ed3\u679c,\u4e22\u7ed9\u5f00\u53d1\n\u8868\u4fe1\u606f \n\u88ab\u963b\u585e\u7684\n\u9501\u6e90SQL\n\n\u7ec3\u4e60:\n\u4e00\u952e\u83b7\u5f97\u4ee5\u4e0a\u4fe1\u606f,\u8bf7\u5199\u51fa\u5177\u4f53\u7684SQL\u8bed\u53e5\n1\u3001\u67e5\u770b\u662f\u5426\u6709\u9501\u7b49\u5f85\nSHOW  STATUS LIKE 'innodb_row_lock%';\n2.\u67e5\u770b\u7b49\u5f85\u9501\u7684\u548c\u9501\u6e90\u7684\u4fe1\u606f\nSELECT * FROM sys.innodb_lock_waits;\n3.\u901a\u8fc7\u9501\u6e90\u7684pid\u627e\u5230\u6267\u884cSQL\u7684thread_ id\nSELECT \n    thread_id,\n    NAME,\n    processlist_id\n    FROM performance_schema.threads WHERE processlist_id=15;\n4.\u901a\u8fc7thread_id\u627e\u5230\u5177\u4f53\u7684\u9501\u6e90\u8bed\u53e5\nSELECT \n\tthread_id,\n    event_name,\n    SQL_text\n\tFROM performance_schema.`events_statements_current` WHERE thread_id=41;\n<\/code><\/pre>\n<h2>7.6 \u4f18\u5316\u9879\u76ee:\u9501\u7684\u76d1\u63a7\u53ca\u5904\u7406<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-csharp\" lang=\"csharp\">1. \u80cc\u666f: \n\u786c\u4ef6\u73af\u5883: DELL R720,E\u7cfb\u521716\u6838,48G MEM,SAS*900G*6,RAID10\n\u5728\u4f8b\u884c\u5de1\u68c0\u65f6,\u53d1\u73b09-11\u70b9\u65f6\u95f4\u6bb5\u7684CPU\u538b\u529b\u975e\u5e38\u9ad8(80-90%)\n\n2. \u9879\u76ee\u7684\u804c\u8d23\n    2.1 \u901a\u8fc7top\u8be6\u7ec6\u6392\u67e5,\u53d1\u73b0mysqld\u8fdb\u7a0b\u5360\u6bd4\u8fbe\u5230\u4e86700-800%\n    2.2 \u5176\u4e2d\u6709\u91cf\u7684CPU\u662f\u88ab\u7528\u4f5c\u7684SYS\u548cWAIT,us\u5904\u4e8e\u6b63\u5e38\n    2.3 \u6000\u7591\u662fMySQL \u9501 \u6216\u8005SQL\u8bed\u53e5\u51fa\u4e86\u95ee\u9898\n    2.4 \u7ecf\u8fc7\u6392\u67e5slowlog\u53ca\u9501\u7b49\u5f85\u60c5\u51b5,\u53d1\u73b0\u6709\u5927\u91cf\u9501\u7b49\u5f85\u53ca\u5c11\u91cf\u6162\u8bed\u53e5    \n    (1) pt-query-diagest \u67e5\u770b\u6162\u65e5\u5fd7  \n    (2) \u9501\u7b49\u5f85\u6709\u6ca1\u6709?\n    db03 [(none)]&gt;show status like 'innodb_row_lock%';\n    +-------------------------------+-------+\n    | Variable_name                 | Value |\n    +-------------------------------+-------+\n    | Innodb_row_lock_current_waits | 0     |\n    | Innodb_row_lock_time          | 0     |\n    | Innodb_row_lock_time_avg      | 0     |\n    | Innodb_row_lock_time_max      | 0     |\n    | Innodb_row_lock_waits         | 0     |\n    +-------------------------------+-------+\n    \u60c5\u51b5\u4e00:\n            \u6709100\u591a\u4e2acurrent_waits,\u8bf4\u660e\u5f53\u524d\u5f88\u591a\u9501\u7b49\u5f85\u60c5\u51b5\n    \u60c5\u51b5\u4e8c:\n            1000\u591a\u4e2alock_waits,\u8bf4\u660e\u5386\u53f2\u4e0a\u53d1\u751f\u8fc7\u7684\u9501\u7b49\u5f85\u5f88\u591a\n    2.5 \u67e5\u770b\u90a3\u4e2a\u4e8b\u52a1\u5728\u7b49\u5f85(\u88ab\u963b\u585e\u4e86)\n    2.6 \u67e5\u770b\u9501\u6e90\u4e8b\u52a1\u4fe1\u606f(\u8c01\u9501\u7684\u6211)\n    2.7 \u627e\u5230\u9501\u6e90\u7684thread_id \n    2.8 \u627e\u5230\u9501\u6e90\u7684SQL\u8bed\u53e5\n3. \u627e\u5230\u8bed\u53e5\u4e4b\u540e,\u548c\u5e94\u7528\u5f00\u53d1\u4eba\u5458\u8fdb\u884c\u534f\u5546   \n    (1)\n    \u5f00\u53d1\u4eba\u5458\u63cf\u8ff0,\u6b64\u8bed\u53e5\u662f\u4e8b\u52a1\u6302\u8d77\u5bfc\u81f4\n    \u6211\u4eec\u63d0\u51fa\u5efa\u8bae\u662f\u4e34\u65f6kill \u4f1a\u8bdd,\u6700\u7ec8\u89e3\u51b3\u95ee\u9898\n    (2) \n    \u5f00\u53d1\u4eba\u5458\u67e5\u770b\u540e,\u53d1\u73b0\u662f\u4e1a\u52a1\u903b\u8f91\u95ee\u9898\u5bfc\u81f4\u7684\u6b7b\u9501,\u4ea7\u751f\u4e86\u5927\u91cf\u9501\u7b49\u5f85\n    \u4e34\u65f6\u89e3\u51b3\u65b9\u6848,\u5c06\u963b\u585e\u4e8b\u52a1\u7684\u4f1a\u8bddkill\u6389.\n    \u6700\u7ec8\u89e3\u51b3\u65b9\u6848,\u4fee\u6539\u4ee3\u7801\u4e2d\u7684\u4e1a\u52a1\u903b\u8f91\n\u9879\u76ee\u7ed3\u679c:\n    \u7ecf\u8fc7\u6392\u67e5\u5904\u7406,\u9501\u7b49\u5f85\u7684\u4e2a\u6570\u51cf\u5c1180%.\u89e3\u51b3\u4e86CPU\u6301\u7eed\u5cf0\u503c\u7684\u95ee\u9898.\n    \n\u9501\u76d1\u63a7\u8bbe\u8ba1\u5230\u7684\u547d\u4ee4:\nshow status like 'innodb_rows_lock%'\nselect * from information_schema.innodb_trx;\nselect * from sys.innodb_lock_waits;\nselect * from performance_schema.threads;\nselect * from performance_schema.events_statements_current;\nselect * from performance_schema.events_statements_history;\n<\/code><\/pre>\n<h2>7.7 \u6b7b\u9501\u76d1\u63a7<\/h2>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-dart\" lang=\"dart\">show engine innodb status\\G\nshow variables like '%deadlock%';\nvim \/etc\/my.cnf \ninnodb_print_all_deadlocks = 1  \n<\/code><\/pre>\n<h1>8. \u4e3b\u4ece\u4f18\u5316\uff1a<\/h1>\n<p>&nbsp;<\/p>\n<pre><code class=\"language-go\" lang=\"go\">## 5.7 \u4ece\u5e93\u591a\u7ebf\u7a0bMTS\n\u57fa\u672c\u8981\u6c42:\n5.7\u4ee5\u4e0a\u7684\u7248\u672c(\u5fd8\u8bb0\u5c0f\u7248\u672c)\n\u5fc5\u987b\u5f00\u542fGTID \nbinlog\u5fc5\u987b\u662frow\u6a21\u5f0f  \n\n#\u5f00\u542fGTID\u6a21\u5f0f\ngtid_mode=ON\nenforce_gtid_consistency=ON\nlog_slave_updates=ON\n\n#\u914d\u7f6eslave\u7aef\u7684SQL\u7ebf\u7a0b\u5e76\u53d1\nslave-parallel-type=LOGICAL_CLOCK \t#\u672c\u5730\u65f6\u949f\uff0c\u53ef\u4ee5\u652f\u6301\u57fa\u4e8e\u4e8b\u52a1\u7ea7\u522b\u7684SQL\u5e76\u53d1\u56de\u653e\uff0c\u9ed8\u8ba4\u4e3aDATABASE\nslave-parallel-workers=16\t\t\t#\u5e76\u53d1\u56de\u653e\u7ebf\u7a0b\u6570\u91cf\uff0c\u4e00\u822c\u4e3acpu\u6838\u5fc3\u6570\u7684\u4e00\u534a\n\n#\u63d0\u9ad8master_info\u4ee5\u53carelay_log\u8bfb\u5199\u5b9e\u65f6\u6027\nmaster_info_repository=TABLE\nrelay_log_info_repository=TABLE\n\n#\u5f00\u542frelay_log\u6062\u590d\u529f\u80fd\nrelay_log_recovery=ON\n\n5.7 :\nslave-parallel-type=LOGICAL_CLOCK\nslave-parallel-workers=8\ncpu\u6838\u5fc3\u6570\u4f5c\u4e3a\u6807\u51c6\n\nCHANGE MASTER TO\n  MASTER_HOST='10.0.0.128',\n  MASTER_USER='repl',\n  MASTER_PASSWORD='123',\n  MASTER_PORT=3307,\n  MASTER_AUTO_POSITION=1;\nstart slave;\n<\/code><\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>mysql\u4f18\u5316 1.\u4f18\u5316\u54f2\u5b66 1.1 \u4e3a\u4ec0\u4e48\u4f18\u5316\uff1f &nbsp; \u4e3a\u4e86\u83b7\u5f97\u6210\u5c31\u611f? \u4e3a\u4e86\u8bc1\u5b9e\u6bd4\u7cfb\u7edf\u8bbe\u8ba1\u8005\u66f4\u61c2\u6570 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-78","post","type-post","status-publish","format-standard","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/daishen.ltd\/index.php?rest_route=\/wp\/v2\/posts\/78","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/daishen.ltd\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/daishen.ltd\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/daishen.ltd\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/daishen.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=78"}],"version-history":[{"count":4,"href":"https:\/\/daishen.ltd\/index.php?rest_route=\/wp\/v2\/posts\/78\/revisions"}],"predecessor-version":[{"id":82,"href":"https:\/\/daishen.ltd\/index.php?rest_route=\/wp\/v2\/posts\/78\/revisions\/82"}],"wp:attachment":[{"href":"https:\/\/daishen.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=78"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/daishen.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=78"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/daishen.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=78"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}