{"id":1760,"date":"2020-07-01T04:23:49","date_gmt":"2020-06-30T20:23:49","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1760"},"modified":"2020-07-01T04:23:49","modified_gmt":"2020-06-30T20:23:49","slug":"mysql-%e5%9f%ba%e6%9c%ac%e6%9e%b6%e6%9e%84%e4%b8%8e%e6%97%a5%e5%bf%97%e4%b8%a4%e9%98%b6%e6%ae%b5%e6%8f%90%e4%ba%a4","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1760","title":{"rendered":"MySQL \u57fa\u672c\u67b6\u6784\u4e0e\u65e5\u5fd7\u4e24\u9636\u6bb5\u63d0\u4ea4"},"content":{"rendered":"<h1 data-v-0b1a4f9a=\\\"\\\"><span style=\\\"font-size: 1.38462rem;\\\">MySQL\u57fa\u672c\u67b6\u6784<\/span><\/h1>\n<div data-v-0b1a4f9a=\\\"\\\" data-id=\\\"5cdfc567f265da1bce3d9fa8\\\">\n<figure><img src=\\\"https:\/\/user-gold-cdn.xitu.io\/2019\/5\/18\/16ac9e356d1ab227?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\\\" data-src=\\\"https:\/\/user-gold-cdn.xitu.io\/2019\/5\/18\/16ac9e356d1ab227?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\\\" data-width=\\\"500\\\" data-height=\\\"912\\\" \/><figcaption><\/figcaption><\/figure>\n<blockquote><p>MySQL\u5927\u81f4\u53ef\u4ee5\u5206\u4e3aServer\u5c42\u548c\u5b58\u50a8\u5f15\u64ce\u5c42<\/p><\/blockquote>\n<p>Server\u5c42\u5305\u62ec\u8fde\u63a5\u5668\uff0c\u67e5\u8be2\u7f13\u5b58\uff0c\u89e3\u6790\u5668\uff0c\u9884\u5904\u7406\u5668\uff0c\u4f18\u5316\u5668\uff0c\u6267\u884c\u5668\u7b49\uff0c\u6240\u6709\u8de8\u5b58\u50a8\u5f15\u64ce\u7684\u529f\u80fd\u90fd\u5728\u8fd9\u4e00\u5c42\u5b9e\u73b0\uff0c\u6bd4\u5982\u5b58\u50a8\u8fc7\u7a0b\uff0c\u89e6\u53d1\u5668\u548c\u89c6\u56fe\u7b49<\/p>\n<h3 data-id=\\\"heading-1\\\">\u8fde\u63a5\u5668<\/h3>\n<ul>\n<li>\u8d1f\u8d23\u8ddf\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\uff0c\u83b7\u53d6\u6743\u9650\uff0c\u7ef4\u6301\u548c\u7ba1\u7406\u8fde\u63a5<\/li>\n<li>\u7528\u6237\u540d\u5bc6\u7801\u9a8c\u8bc1\u901a\u8fc7\u540e\uff0c\u8fde\u63a5\u5668\u4f1a\u5230\u6743\u9650\u8868\u4e2d\u67e5\u8be2\u7528\u6237\u7684\u6743\u9650\uff0c\u4e4b\u540e\u8fd9\u4e2a\u94fe\u63a5\u91cc\u9762\u7684\u6743\u9650\u5224\u65ad\u903b\u8f91\uff0c\u90fd\u4f9d\u8d56\u4e8e\u6b64\u65f6\u8bfb\u53d6\u7684\u6743\u9650\uff1b\u5373\u4f7f\u4f7f\u7528\u7ba1\u7406\u5458\u8d26\u53f7\u5bf9\u7528\u6237\u6743\u9650\u4f5c\u4fee\u6539\uff0c\u4e5f\u4e0d\u4f1a\u5f71\u54cd\u5df2\u5b58\u5728\u7684\u8fde\u63a5\u7684\u6743\u9650<\/li>\n<li>\u53c2\u6570wait_timeout\u63a7\u5236\u670d\u52a1\u5668\u4fdd\u6301\u4e0e\u5ba2\u6237\u7aef\u7684\u7a7a\u95f2\u8fde\u63a5\u7684\u65f6\u957f\uff0c\u9ed8\u8ba4\u503c\u4e3a8\u5c0f\u65f6<\/li>\n<li>\u957f\u8fde\u63a5\u79ef\u7d2f\u5bfc\u81f4MySQL\u5360\u7528\u5185\u5b58\u98de\u6da8\n<ul>\n<li>\u8003\u8651\u5b9a\u671f\u65ad\u5f00\u957f\u8fde\u63a5<\/li>\n<li>MySQL5.7\u4ee5\u540e\uff0c\u6267\u884cmysql_reset_connection\u6765\u91cd\u65b0\u521d\u59cb\u5316\u8fde\u63a5\u8d44\u6e90 (\u6b64\u8fc7\u7a0b\u4e0d\u9700\u8981\u91cd\u8fde\u548c\u91cd\u73b0\u9a8c\u8bc1\u6743\u9650\uff0c\u4f46\u662f\u4f1a\u5c06\u8fde\u63a5\u6062\u590d\u5230\u521a\u521b\u5efa\u5b8c\u6210\u7684\u72b6\u6001)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<blockquote><p>MySQL :: MySQL 5.7 Reference Manual :: 27.8.7.60 mysql_reset_connection()\u00a0<a href=\\\"https:\/\/dev.mysql.com\/doc\/refman\/5.7\/en\/mysql-reset-connection.html\\\" target=\\\"_blank\\\" rel=\\\"nofollow noopener noreferrer\\\">dev.mysql.com\/doc\/refman\/\u2026<\/a><\/p><\/blockquote>\n<h3 data-id=\\\"heading-2\\\">\u67e5\u8be2\u7f13\u5b58<\/h3>\n<ul>\n<li>\u5982\u679c\u67e5\u8be2\u6070\u597d\u547d\u4e2d\u67e5\u8be2\u7f13\u5b58\uff0c\u90a3\u4e48\u67e5\u8be2\u4e0d\u4f1a\u88ab\u89e3\u6790\uff0c\u6267\u884c\u8ba1\u5212\u4e0d\u4f1a\u88ab\u751f\u6210\uff0c\u5728\u8fd4\u56de\u67e5\u8be2\u7ed3\u679c\u4e4b\u524d\uff0cMySQL\u4f1a\u68c0\u67e5\u7528\u6237\u7684\u6743\u9650<\/li>\n<li>\u5bf9\u4e00\u5f20\u8868\u7684\u66f4\u65b0\uff0c\u4f1a\u5bfc\u81f4\u8fd9\u5f20\u8868\u7684\u67e5\u8be2\u7f13\u5b58\u88ab\u6e05\u7a7a(\u67e5\u8be2\u7f13\u5b58\u5931\u6548\u9891\u7e41\uff0c\u5f0a\u5927\u4e8e\u5229)<\/li>\n<li>\u63a8\u8350\u6309\u9700\u4f7f\u7528\u67e5\u8be2\u7f13\u5b58\n<ul>\n<li>\u8bbe\u7f6e\u53c2\u6570query_cache_type\u8bbe\u7f6e\u6210DEMAND\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cSQL\u4e0d\u4f7f\u7528\u67e5\u8be2\u7f13\u5b58\uff0c\u901a\u8fc7SQL_CACHE\u663e\u793a\u6307\u5b9a\u4f7f\u7528\u67e5\u8be2\u7f13\u5b58<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<pre>select SQL_CACHE * from T where ID = 10;<\/pre>\n<ul>\n<li>MySQL 8.0\u5df2\u7ecf\u5c06\u67e5\u8be2\u7f13\u5b58\u6574\u5757\u529f\u80fd\u5220\u9664\u6389<\/li>\n<\/ul>\n<h3 data-id=\\\"heading-3\\\">\u89e3\u6790\u5668\uff08\u505a\u4ec0\u4e48\uff09<\/h3>\n<ul>\n<li>\u8bcd\u6cd5\u5206\u6790\uff0c\u8bc6\u522bSQL\u4e2d\u7684\u5b57\u7b26\u4e32\u662f\u4ec0\u4e48<\/li>\n<li>\u8bed\u6cd5\u5206\u6790\n<ul>\n<li>\u5728\u8bcd\u6cd5\u5206\u6790\u7684\u57fa\u7840\u4e0a\uff0c\u6839\u636e\u8bed\u6cd5\u89c4\u5219\uff0c\u5224\u65adSQL\u662f\u5426\u6ee1\u8db3MySQL\u8bed\u6cd5\uff0c\u6700\u540e\u5f97\u5230\u4e00\u68f5\u8bed\u6cd5\u6811<\/li>\n<li>\u5bf9\u4e8e\u53ea\u662f\u53c2\u6570\u4e0d\u540c\uff0c\u5176\u4ed6\u5747\u76f8\u540c\u7684sql\uff0c\u5b83\u4eec\u6267\u884c\u65f6\u95f4\u4e0d\u540c\u4f46\u786c\u89e3\u6790\u7684\u65f6\u95f4\u662f\u76f8\u540c\u7684\uff1b\u800c\u540c\u4e00SQL\u968f\u7740\u67e5\u8be2\u6570\u636e\u7684\u53d8\u5316\uff0c\u591a\u6b21\u67e5\u8be2\u6267\u884c\u65f6\u95f4\u53ef\u80fd\u4e0d\u540c\uff0c\u4f46\u786c\u89e3\u6790\u7684\u65f6\u95f4\u662f\u4e0d\u53d8\u7684<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<blockquote><p>\u8bcd\u6cd5\u5206\u6790 -&gt; \u8bed\u6cd5\u5206\u6790\u53ef\u4ee5\u79f0\u4e3a\u786c\u89e3\u6790<\/p><\/blockquote>\n<h3 data-id=\\\"heading-4\\\">\u9884\u5904\u7406\u5668<\/h3>\n<ul>\n<li>\u6839\u636eMySQL\u89c4\u5219\uff0c\u8fdb\u4e00\u6b65\u68c0\u67e5\u8bed\u6cd5\u6811\u662f\u5426\u5408\u6cd5<\/li>\n<\/ul>\n<blockquote><p>\u6bd4\u5982\u68c0\u67e5\u8868\u3001\u6570\u636e\u5217\u662f\u5426\u5b58\u5728\uff1b\u522b\u540d\u662f\u5426\u6709\u6b67\u4e49\u7b49\u7b49<\/p><\/blockquote>\n<h3 data-id=\\\"heading-5\\\">\u4f18\u5316\u5668\uff08\u600e\u4e48\u505a\uff09<\/h3>\n<ul>\n<li>\u4f18\u5316\u5668\u4f1a\u5c06\u8bed\u6cd5\u6811\u8f6c\u5316\u6210\u6267\u884c\u8ba1\u5212\uff08\u53ef\u4ee5\u751f\u6210\u591a\u4e2a\u6267\u884c\u8ba1\u5212\uff09\uff0c\u7136\u540e\u627e\u51fa\u6700\u5408\u9002\u7684\u6267\u884c\u8ba1\u5212\uff08\u6210\u672c\u6700\u5c11\uff09<\/li>\n<li>\u53ef\u4ee5\u901a\u8fc7Last_query_cost\u5f97\u77e5\u67e5\u8be2\u7684\u6210\u672c<\/li>\n<\/ul>\n<figure><img \/>\\&#8221; alt=\\&#8221;\u4f18\u5316\u5668\u8ba4\u4e3a\uff0c\u8fd9\u6761SQL\u5927\u6982\u9700\u8981\u505a1.399\u4e2a\u6570\u636e\u9875\u7684\u968f\u673a\u67e5\u627e\u624d\u80fd\u5b8c\u6210\u67e5\u8be2\\&#8221; data-src=\\&#8221;https:\/\/user-gold-cdn.xitu.io\/2019\/5\/18\/16ac9fad386a635e?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\\&#8221; data-width=\\&#8221;1187\\&#8221; data-height=\\&#8221;415\\&#8221; \/&gt;<figcaption><\/figcaption><\/figure>\n<blockquote><p>\u4e0a\u56fe\u8868\u793a\uff0c\u4f18\u5316\u5668\u8ba4\u4e3a\uff0c\u8fd9\u6761SQL\u5927\u6982\u9700\u8981\u505a1.399\u4e2a\u6570\u636e\u9875\u7684\u968f\u673a\u67e5\u627e\u624d\u80fd\u5b8c\u6210\u67e5\u8be2<\/p><\/blockquote>\n<ul>\n<li>\u53ef\u4ee5\u8bf7\u6c42\u4f18\u5316\u5668\u89e3\u6790\u4f18\u5316\u8fc7\u7a0b\u7684\u5404\u4e2a\u56e0\u7d20\uff08explain sql\uff09<\/li>\n<li>\u5728\u8868\u91cc\u9762\u6709\u591a\u4e2a\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u51b3\u5b9a\u4f7f\u7528\u90a3\u4e2a\u7d22\u5f15<\/li>\n<li>\u901a\u8fc7\u7279\u6b8a\u7684\u5173\u952e\u5b57\u63d0\u793a\u4f18\u5316\u5668\uff0c\u53ef\u4ee5\u5f71\u54cd\u4f18\u5316\u5668\u7684\u51b3\u7b56\u8fc7\u7a0b\uff08\u4f8b\u5982\uff1afor index\uff09<\/li>\n<li>\u4f18\u5316\u5668\u9636\u6bb5\u5b8c\u6210\u540e\uff0c\u6267\u884c\u8ba1\u5212\u5c31\u786e\u5b9a\u4e0b\u6765\u4e86<\/li>\n<li>\u4f18\u5316\u5668\u6709\u65f6\u5019\u4f1a\u9009\u62e9\u9519\u8bef\u7684\u6267\u884c\u8ba1\u5212\n<ul>\n<li>\u7d22\u5f15\u7edf\u8ba1\u4fe1\u606f\u4e0d\u51c6<\/li>\n<li>\u4f18\u5316\u5668\u7406\u89e3\u7684\u6700\u4f18\u6267\u884c\u8ba1\u5212\u4e0d\u4e00\u5b9a\u662f\u54cd\u5e94\u6700\u5feb\u7684\u6267\u884c\u8ba1\u5212<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3 data-id=\\\"heading-6\\\">\u5b58\u50a8\u5f15\u64ce\u5c42<\/h3>\n<ul>\n<li>\u8d1f\u8d23\u6570\u636e\u7684\u5b58\u50a8\u548c\u63d0\u53d6\uff0c\u63d2\u4ef6\u5f0f\u7684\u67b6\u6784\u6a21\u5f0f\uff0c\u652f\u6301InnoDB\uff0cMyISAM\u7b49\u591a\u4e2a\u5b58\u50a8\u5f15\u64ce<\/li>\n<li>\u4e0d\u540c\u7684\u5b58\u50a8\u5f15\u64ce\u5171\u7528\u540c\u4e00\u4e2aServer\u5c42<\/li>\n<\/ul>\n<h2 data-id=\\\"heading-7\\\">redo log<\/h2>\n<blockquote><p>InnoDB\u5f15\u64ce\u72ec\u6709\u7684\u65e5\u5fd7\uff0c\u5b58\u50a8\u5f15\u64ce\u5c42\u65e5\u5fd7<\/p><\/blockquote>\n<ul>\n<li>\u5f53\u6709\u4e00\u6761\u8bb0\u5f55\u9700\u8981\u66f4\u65b0\u7684\u65f6\u5019\uff0cInnoDB\u5f15\u64ce\u4f1a\u66f4\u65b0\u5185\u5b58\uff0c\u5e76\u628a\u8bb0\u5f55\u5199\u5230redo log\u91cc\u9762\uff0c\u7136\u540e\u5728\u9002\u5f53\u7684\u65f6\u5019\uff0c\u5c06\u8fd9\u4e2a\u64cd\u4f5c\u8bb0\u5f55\u66f4\u65b0\u5230\u78c1\u76d8<\/li>\n<li>redo log\u7684\u5927\u5c0f\u662f\u56fa\u5b9a\u7684\n<ul>\n<li>write pos\u662f\u5f53\u524d\u8bb0\u5f55\u7684\u4f4d\u7f6e\uff0c\u4e00\u8fb9\u5199\u4e00\u8fb9\u540e\u79fb\uff0c\u5199\u5230\u672b\u5c3e\u53c8\u4ece\u5934\u5f00\u59cb<\/li>\n<li>check point\u662f\u5f53\u524d\u8981\u64e6\u9664\u7684\u4f4d\u7f6e\uff0c\u540c\u6837\u4e5f\u662f\u5f80\u540e\u79fb\u52a8\u5e76\u4e14\u5faa\u73af\uff0c\u64e6\u9664\u8bb0\u5f55\uff0c\u5148\u628a\u65e5\u5fd7\u66f4\u65b0\u5230\u78c1\u76d8\u4e2d<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<figure><img src=\\\"https:\/\/user-gold-cdn.xitu.io\/2019\/5\/18\/16aca11c419c16b6?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\\\" data-src=\\\"https:\/\/user-gold-cdn.xitu.io\/2019\/5\/18\/16aca11c419c16b6?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\\\" data-width=\\\"466\\\" data-height=\\\"423\\\" \/><figcaption><\/figcaption><\/figure>\n<blockquote><p>\u6709\u4e86redo log\uff0cinnodb\u53ef\u4ee5\u4fdd\u8bc1\uff0c\u6570\u636e\u5e93\u53d1\u751f\u5f02\u5e38\u91cd\u542f\uff0c\u4e4b\u524d\u63d0\u4ea4\u7684\u8bb0\u5f55\u90fd\u4e0d\u4f1a\u4e22\u5931\uff08\u5d29\u6e83\u6062\u590d\u80fd\u529b\uff0ccrash-safe\uff09<\/p><\/blockquote>\n<h2 data-id=\\\"heading-8\\\">bin log<\/h2>\n<ul>\n<li>Server\u5c42\u7684\u65e5\u5fd7\uff0c\u53ea\u80fd\u7528\u4e8e\u5f52\u6863\uff0c\uff0c\u6ca1\u6709carsh-safe\u80fd\u529b<\/li>\n<\/ul>\n<blockquote><p>\u4e4b\u540e\u518d\u4ecb\u7ecd\u66f4\u52a0\u8be6\u7ec6\u7684\u4fe1\u606f<\/p><\/blockquote>\n<h2 data-id=\\\"heading-9\\\">redo log\u8ddfbin log\u7684\u533a\u522b<\/h2>\n<ol>\n<li>redo log\u662fInnoDB\u7279\u6709\u7684\uff1bbinlog\u662fServer\u5c42\u5b9e\u73b0\u7684\uff0c\u6240\u6709\u5b58\u50a8\u5f15\u64ce\u90fd\u53ef\u4ee5\u4f7f\u7528<\/li>\n<li>redo log\u662f\u7269\u7406\u65e5\u5fd7\uff0c\u8bb0\u5f55\u201c\u67d0\u4e2a\u6570\u636e\u9875\u4e0a\u7684\u4fee\u6539\u201d\uff1bbinlog\u662f\u903b\u8f91\u65e5\u5fd7\uff0c\u8bb0\u5f55\u8bed\u53e5\u7684\u539f\u59cb\u903b\u8f91<\/li>\n<li>redo log\u662f\u5faa\u73af\u5199\u7684\uff0c\u7a7a\u95f4\u56fa\u5b9a\uff1bbinlog\u662f\u53ef\u4ee5\u8ffd\u52a0\u5199\u5165\u7684\uff0c\u4e0d\u4f1a\u8986\u76d6\u4ee5\u524d\u7684\u65e5\u5fd7<\/li>\n<\/ol>\n<h2 data-id=\\\"heading-10\\\">\u4e00\u6761\u66f4\u65b0\u8bed\u53e5\u7684\u6267\u884c\u6d41\u7a0b<\/h2>\n<figure><img src=\\\"https:\/\/user-gold-cdn.xitu.io\/2019\/5\/18\/16aca158bd2eef8c?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\\\" data-src=\\\"https:\/\/user-gold-cdn.xitu.io\/2019\/5\/18\/16aca158bd2eef8c?imageView2\/0\/w\/1280\/h\/960\/format\/webp\/ignore-error\/1\\\" data-width=\\\"455\\\" data-height=\\\"774\\\" \/><figcaption><\/figcaption><\/figure>\n<blockquote><p>\u901a\u8fc7\u65e5\u5fd7\u4e24\u9636\u6bb5\u63d0\u4ea4\uff0c\u53ef\u4ee5\u4fdd\u8bc1redo log\u548cbin log\u7684\u903b\u8f91\u4e00\u81f4<\/p><\/blockquote>\n<ul>\n<li>\u5982\u679c\u4e8b\u52a1\u5728\u2460\u5904\u5954\u6e83\u4e86\uff0c\u4e8b\u52a1\u4f1a\u56de\u6eda<\/li>\n<li>\u5982\u679c\u4e8b\u52a1\u5728\u2461\u5904\u5954\u6e83\u4e86\uff0c\u7531\u4e8eredo log\u5904\u4e8eprepare\u9636\u6bb5\uff0c\u5e76\u4e14binlog\u4e5f\u5df2\u7ecf\u5199\u5165\uff0c\u90a3\u4e48\u5728\u6062\u590d\u4e8b\u52a1\u7684\u65f6\u5019\uff0c\u4f1a\u81ea\u52a8commit<\/li>\n<\/ul>\n<h2 data-id=\\\"heading-11\\\">Write-Ahead 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