{"id":1605,"date":"2022-11-19T17:20:26","date_gmt":"2022-11-19T09:20:26","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1605"},"modified":"2022-11-27T12:40:57","modified_gmt":"2022-11-27T04:40:57","slug":"mysql%e9%80%bb%e8%be%91%e6%9e%b6%e6%9e%84%e3%80%81sql%e6%89%a7%e8%a1%8c%e6%b5%81%e7%a8%8b%e3%80%81mysql8-0%e5%92%8c5-7%e4%b8%adsql%e6%89%a7%e8%a1%8c%e6%b5%81%e7%a8%8b%e7%9a%84%e6%bc%94%e7%a4%ba","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1605","title":{"rendered":"MySQL\u903b\u8f91\u67b6\u6784\u3001SQL\u6267\u884c\u6d41\u7a0b\u3001MySQL8.0\u548c5.7\u4e2dSQL\u6267\u884c\u6d41\u7a0b\u7684\u6f14\u793a\u3001Oracle\u4e2dSQL\u6267\u884c\u6d41\u7a0b_\u7f13\u51b2\u6c60\u7684\u4f7f\u7528"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code># \u7b2c04\u7ae0_\u903b\u8f91\u67b6\u6784\r\n\r\n# 1. \u903b\u8f91\u67b6\u6784\u5256\u6790\r\n\r\n# 1.3 \u7b2c1\u5c42\uff1a\u8fde\u63a5\u5c42\r\n\r\n# \u7cfb\u7edf\uff08\u5ba2\u6237\u7aef\uff09\u8bbf\u95ee MySQL \u670d\u52a1\u5668\u524d\uff0c\u505a\u7684\u7b2c\u4e00\u4ef6\u4e8b\u5c31\u662f\u5efa\u7acb TCP \u8fde\u63a5\u3002\r\n\r\n# \u7ecf\u8fc7\u4e09\u6b21\u63e1\u624b\u5efa\u7acb\u8fde\u63a5\u6210\u529f\u540e\uff0c MySQL \u670d\u52a1\u5668\u5bf9 TCP \u4f20\u8f93\u8fc7\u6765\u7684\u8d26\u53f7\u5bc6\u7801\u505a\u8eab\u4efd\u8ba4\u8bc1\u3001\u6743\u9650\u83b7\u53d6\u3002\r\n#     \u7528\u6237\u540d\u6216\u5bc6\u7801\u4e0d\u5bf9\uff0c\u4f1a\u6536\u5230\u4e00\u4e2aAccess denied for user\u9519\u8bef\uff0c\u5ba2\u6237\u7aef\u7a0b\u5e8f\u7ed3\u675f\u6267\u884c\r\n#     \u7528\u6237\u540d\u5bc6\u7801\u8ba4\u8bc1\u901a\u8fc7\uff0c\u4f1a\u4ece\u6743\u9650\u8868\u67e5\u51fa\u8d26\u53f7\u62e5\u6709\u7684\u6743\u9650\u4e0e\u8fde\u63a5\u5173\u8054\uff0c\u4e4b\u540e\u7684\u6743\u9650\u5224\u65ad\u903b\u8f91\uff0c\u90fd\u5c06\u4f9d\u8d56\u4e8e\u6b64\u65f6\u8bfb\u5230\u7684\u6743\u9650\r\n\r\n# TCP \u8fde\u63a5\u6536\u5230\u8bf7\u6c42\u540e\uff0c\u5fc5\u987b\u8981\u5206\u914d\u7ed9\u4e00\u4e2a\u7ebf\u7a0b\u4e13\u95e8\u4e0e\u8fd9\u4e2a\u5ba2\u6237\u7aef\u7684\u4ea4\u4e92\u3002\u6240\u4ee5\u8fd8\u4f1a\u6709\u4e2a\u7ebf\u7a0b\u6c60\uff0c\u53bb\u8d70\u540e\u9762\u7684\u6d41\u7a0b\u3002\r\n# \u6bcf\u4e00\u4e2a\u8fde\u63a5\u4ece\u7ebf\u7a0b\u6c60\u4e2d\u83b7\u53d6\u7ebf\u7a0b\uff0c\u7701\u53bb\u4e86\u521b\u5efa\u548c\u9500\u6bc1\u7ebf\u7a0b\u7684\u5f00\u9500\u3002\r\n\r\n# 1.4 \u7b2c2\u5c42\uff1a\u670d\u52a1\u5c42\r\n\r\n# SQL Interface: SQL\u63a5\u53e3\r\n#     \u63a5\u6536\u7528\u6237\u7684SQL\u547d\u4ee4\uff0c\u5e76\u4e14\u8fd4\u56de\u7528\u6237\u9700\u8981\u67e5\u8be2\u7684\u7ed3\u679c\u3002\u6bd4\u5982SELECT ... FROM\u5c31\u662f\u8c03\u7528SQLInterface\r\n#     MySQL\u652f\u6301DML\uff08\u6570\u636e\u64cd\u4f5c\u8bed\u8a00\uff09\u3001DDL\uff08\u6570\u636e\u5b9a\u4e49\u8bed\u8a00\uff09\u3001\u5b58\u50a8\u8fc7\u7a0b\u3001\u89c6\u56fe\u3001\u89e6\u53d1\u5668\u3001\u81ea\u5b9a\u4e49\u51fd\u6570\u7b49\u591a\u79cdSQL\u8bed\u8a00\u63a5\u53e3\r\n\r\n# Parser: \u89e3\u6790\u5668\r\n#     \u5728\u89e3\u6790\u5668\u4e2d\u5bf9 SQL \u8bed\u53e5\u8fdb\u884c\u8bed\u6cd5\u5206\u6790\u3001\u8bed\u4e49\u5206\u6790\u3002\u5c06SQL\u8bed\u53e5\u5206\u89e3\u6210\u6570\u636e\u7ed3\u6784\uff0c\u5e76\u5c06\u8fd9\u4e2a\u7ed3\u6784\u4f20\u9012\u5230\u540e\u7eed\u6b65\u9aa4\uff0c\r\n# \u4ee5\u540eSQL\u8bed\u53e5\u7684\u4f20\u9012\u548c\u5904\u7406\u5c31\u662f\u57fa\u4e8e\u8fd9\u4e2a\u7ed3\u6784\u7684\u3002\u5982\u679c\u5728\u5206\u89e3\u6784\u6210\u4e2d\u9047\u5230\u9519\u8bef\uff0c\u90a3\u4e48\u5c31\u8bf4\u660e\u8fd9\u4e2aSQL\u8bed\u53e5\u662f\u4e0d\u5408\u7406\u7684\u3002\r\n#     \u5728SQL\u547d\u4ee4\u4f20\u9012\u5230\u89e3\u6790\u5668\u7684\u65f6\u5019\u4f1a\u88ab\u89e3\u6790\u5668\u9a8c\u8bc1\u548c\u89e3\u6790\uff0c\u5e76\u4e3a\u5176\u521b\u5efa \u8bed\u6cd5\u6811 \uff0c\u5e76\u6839\u636e\u6570\u636e\u5b57\u5178\u4e30\u5bcc\u67e5\u8be2\u8bed\u6cd5\u6811\uff0c\r\n# \u4f1a \u9a8c\u8bc1\u8be5\u5ba2\u6237\u7aef\u662f\u5426\u5177\u6709\u6267\u884c\u8be5\u67e5\u8be2\u7684\u6743\u9650 \u3002\u521b\u5efa\u597d\u8bed\u6cd5\u6811\u540e\uff0cMySQL\u8fd8\u4f1a\u5bf9SQl\u67e5\u8be2\u8fdb\u884c\u8bed\u6cd5\u4e0a\u7684\u4f18\u5316\uff0c\r\n# \u8fdb\u884c\u67e5\u8be2\u91cd\u5199\u3002\r\n\r\n# Optimizer: \u67e5\u8be2\u4f18\u5316\u5668\r\n#     SQL\u8bed\u53e5\u5728\u8bed\u6cd5\u89e3\u6790\u4e4b\u540e\u3001\u67e5\u8be2\u4e4b\u524d\u4f1a\u4f7f\u7528\u67e5\u8be2\u4f18\u5316\u5668\u786e\u5b9a SQL \u8bed\u53e5\u7684\u6267\u884c\u8def\u5f84\uff0c\u751f\u6210\u4e00\u4e2a\u6267\u884c\u8ba1\u5212 \u3002\r\n#     \u8fd9\u4e2a\u6267\u884c\u8ba1\u5212\u8868\u660e\u5e94\u8be5 \u4f7f\u7528\u54ea\u4e9b\u7d22\u5f15 \u8fdb\u884c\u67e5\u8be2\uff08\u5168\u8868\u68c0\u7d22\u8fd8\u662f\u4f7f\u7528\u7d22\u5f15\u68c0\u7d22\uff09\uff0c\u8868\u4e4b\u95f4\u7684\u8fde\u63a5\u987a\u5e8f\u5982\u4f55\uff0c\r\n# \u6700\u540e\u4f1a\u6309\u7167\u6267\u884c\u8ba1\u5212\u4e2d\u7684\u6b65\u9aa4\u8c03\u7528\u5b58\u50a8\u5f15\u64ce\u63d0\u4f9b\u7684\u65b9\u6cd5\u6765\u771f\u6b63\u7684\u6267\u884c\u67e5\u8be2\uff0c\u5e76\u5c06\u67e5\u8be2\u7ed3\u679c\u8fd4\u56de\u7ed9\u7528\u6237\u3002\r\n#     \u5b83\u4f7f\u7528\u201c \u9009\u53d6-\u6295\u5f71-\u8fde\u63a5 \u201d\u7b56\u7565\u8fdb\u884c\u67e5\u8be2\u3002\u4f8b\u5982\uff1a\r\n#     SELECT id,name FROM student WHERE gender = '\u5973';\r\n#     \u8fd9\u4e2aSELECT\u67e5\u8be2\u5148\u6839\u636eWHERE\u8bed\u53e5\u8fdb\u884c \u9009\u53d6 \uff0c\u800c\u4e0d\u662f\u5c06\u8868\u5168\u90e8\u67e5\u8be2\u51fa\u6765\u4ee5\u540e\u518d\u8fdb\u884cgender\u8fc7\u6ee4\u3002\r\n# \u8fd9\u4e2aSELECT\u67e5\u8be2\u5148\u6839\u636eid\u548cname\u8fdb\u884c\u5c5e\u6027 \u6295\u5f71 \uff0c\u800c\u4e0d\u662f\u5c06\u5c5e\u6027\u5168\u90e8\u53d6\u51fa\u4ee5\u540e\u518d\u8fdb\u884c\u8fc7\u6ee4\uff0c\r\n# \u5c06\u8fd9\u4e24\u4e2a\u67e5\u8be2\u6761\u4ef6 \u8fde\u63a5 \u8d77\u6765\u751f\u6210\u6700\u7ec8\u67e5\u8be2\u7ed3\u679c\u3002\r\n\r\n# Caches &amp; Buffers\uff1a \u67e5\u8be2\u7f13\u5b58\u7ec4\u4ef6\r\n#     MySQL\u5185\u90e8\u7ef4\u6301\u7740\u4e00\u4e9bCache\u548cBuffer\uff0c\u6bd4\u5982Query Cache\u7528\u6765\u7f13\u5b58\u4e00\u6761SELECT\u8bed\u53e5\u7684\u6267\u884c\u7ed3\u679c\uff0c\r\n# \u5982\u679c\u80fd\u591f\u5728\u5176\u4e2d\u627e\u5230\u5bf9\u5e94\u7684\u67e5\u8be2\u7ed3\u679c\uff0c\u90a3\u4e48\u5c31\u4e0d\u5fc5\u518d\u8fdb\u884c\u67e5\u8be2\u89e3\u6790\u3001\u4f18\u5316\u548c\u6267\u884c\u7684\u6574\u4e2a\u8fc7\u7a0b\u4e86\uff0c\u76f4\u63a5\u5c06\u7ed3\u679c\u53cd\u9988\u7ed9\u5ba2\u6237\u7aef\u3002\r\n#     \u8fd9\u4e2a\u7f13\u5b58\u673a\u5236\u662f\u7531\u4e00\u7cfb\u5217\u5c0f\u7f13\u5b58\u7ec4\u6210\u7684\u3002\u6bd4\u5982\u8868\u7f13\u5b58\uff0c\u8bb0\u5f55\u7f13\u5b58\uff0ckey\u7f13\u5b58\uff0c\u6743\u9650\u7f13\u5b58\u7b49 \u3002\r\n#     \u8fd9\u4e2a\u67e5\u8be2\u7f13\u5b58\u53ef\u4ee5\u5728 \u4e0d\u540c\u5ba2\u6237\u7aef\u4e4b\u95f4\u5171\u4eab \u3002\r\n#     \u4eceMySQL 5.7.20\u5f00\u59cb\uff0c\u4e0d\u63a8\u8350\u4f7f\u7528\u67e5\u8be2\u7f13\u5b58\uff0c\u5e76\u5728 MySQL 8.0\u4e2d\u5220\u9664 \u3002\r\n\r\n# 1.5 \u7b2c3\u5c42\uff1a\u5f15\u64ce\u5c42\r\n\r\n# \u63d2\u4ef6\u5f0f\u5b58\u50a8\u5f15\u64ce\u5c42\uff08 Storage Engines\uff09\uff0c\u771f\u6b63\u7684\u8d1f\u8d23\u4e86MySQL\u4e2d\u6570\u636e\u7684\u5b58\u50a8\u548c\u63d0\u53d6\uff0c\r\n# \u5bf9\u7269\u7406\u670d\u52a1\u5668\u7ea7\u522b\u7ef4\u62a4\u7684\u5e95\u5c42\u6570\u636e\u6267\u884c\u64cd\u4f5c\uff0c\u670d\u52a1\u5668\u901a\u8fc7API\u4e0e\u5b58\u50a8\u5f15\u64ce\u8fdb\u884c\u901a\u4fe1\u3002\u4e0d\u540c\u7684\u5b58\u50a8\u5f15\u64ce\u5177\u6709\u7684\u529f\u80fd\u4e0d\u540c\uff0c\r\n# \u8fd9\u6837\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u81ea\u5df1\u7684\u5b9e\u9645\u9700\u8981\u8fdb\u884c\u9009\u53d6\u3002\r\n\r\nSHOW ENGINES;\r\n\r\n# 1.6 \u5b58\u50a8\u5c42\r\n\r\n# \u6240\u6709\u7684\u6570\u636e\uff0c\u6570\u636e\u5e93\u3001\u8868\u7684\u5b9a\u4e49\uff0c\u8868\u7684\u6bcf\u4e00\u884c\u7684\u5185\u5bb9\uff0c\u7d22\u5f15\uff0c\u90fd\u662f\u5b58\u5728 \u6587\u4ef6\u7cfb\u7edf \u4e0a\uff0c\u4ee5 \u6587\u4ef6 \u7684\u65b9\u5f0f\u5b58\u5728\u7684\uff0c\r\n# \u5e76\u5b8c\u6210\u4e0e\u5b58\u50a8\u5f15\u64ce\u7684\u4ea4\u4e92\u3002\u5f53\u7136\u6709\u4e9b\u5b58\u50a8\u5f15\u64ce\u6bd4\u5982InnoDB\uff0c\u4e5f\u652f\u6301\u4e0d\u4f7f\u7528\u6587\u4ef6\u7cfb\u7edf\u76f4\u63a5\u7ba1\u7406\u88f8\u8bbe\u5907\uff0c\r\n# \u4f46\u73b0\u4ee3\u6587\u4ef6\u7cfb\u7edf\u7684\u5b9e\u73b0\u4f7f\u5f97\u8fd9\u6837\u505a\u6ca1\u6709\u5fc5\u8981\u4e86\u3002\u5728\u6587\u4ef6\u7cfb\u7edf\u4e4b\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528\u672c\u5730\u78c1\u76d8\uff0c\r\n# \u53ef\u4ee5\u4f7f\u7528DAS\u3001NAS\u3001SAN\u7b49\u5404\u79cd\u5b58\u50a8\u7cfb\u7edf\u3002\r\n\r\nSHOW VARIABLES LIKE '%datadir%';\r\n\r\n# 1.7 \u5c0f\u7ed3\r\n\r\n# \u7b80\u5316\u4e3a\u4e09\u5c42\u7ed3\u6784\uff1a\r\n# 1. \u8fde\u63a5\u5c42\uff1a\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u5efa\u7acb\u8fde\u63a5\uff0c\u5ba2\u6237\u7aef\u53d1\u9001 SQL \u81f3\u670d\u52a1\u5668\u7aef\uff1b\r\n# 2. SQL \u5c42\uff08\u670d\u52a1\u5c42\uff09\uff1a\u5bf9 SQL \u8bed\u53e5\u8fdb\u884c\u67e5\u8be2\u5904\u7406\uff1b\u4e0e\u6570\u636e\u5e93\u6587\u4ef6\u7684\u5b58\u50a8\u65b9\u5f0f\u65e0\u5173\uff1b\r\n# 3. \u5b58\u50a8\u5f15\u64ce\u5c42\uff1a\u4e0e\u6570\u636e\u5e93\u6587\u4ef6\u6253\u4ea4\u9053\uff0c\u8d1f\u8d23\u6570\u636e\u7684\u5b58\u50a8\u548c\u8bfb\u53d6\u3002\r\n\r\n# 2. SQL\u6267\u884c\u6d41\u7a0b\r\n\r\n# MySQL\u7684\u67e5\u8be2\u6d41\u7a0b\uff1a\r\n\r\n# 1. \u67e5\u8be2\u7f13\u5b58\uff1aServer \u5982\u679c\u5728\u67e5\u8be2\u7f13\u5b58\u4e2d\u53d1\u73b0\u4e86\u8fd9\u6761 SQL \u8bed\u53e5\uff0c\u5c31\u4f1a\u76f4\u63a5\u5c06\u7ed3\u679c\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\uff1b\u5982\u679c\u6ca1\u6709\uff0c\r\n# \u5c31\u8fdb\u5165\u5230\u89e3\u6790\u5668\u9636\u6bb5\u3002\u9700\u8981\u8bf4\u660e\u7684\u662f\uff0c\u56e0\u4e3a\u67e5\u8be2\u7f13\u5b58\u5f80\u5f80\u6548\u7387\u4e0d\u9ad8\uff0c\u6240\u4ee5\u5728 MySQL8.0 \u4e4b\u540e\u5c31\u629b\u5f03\u4e86\u8fd9\u4e2a\u529f\u80fd\u3002\r\n\r\n# \u67e5\u8be2\u7f13\u5b58 8.0\u5df2\u79fb\u9664\r\nSHOW VARIABLES LIKE '%query_cache_type';\r\n\r\nSHOW STATUS LIKE 'Qcache%';\r\n\r\n# \u67e5\u8be2\u7f13\u5b58\u662f\u63d0\u524d\u628a\u67e5\u8be2\u7ed3\u679c\u7f13\u5b58\u8d77\u6765\uff0c\u8fd9\u6837\u4e0b\u6b21\u4e0d\u9700\u8981\u6267\u884c\u5c31\u53ef\u4ee5\u76f4\u63a5\u62ff\u5230\u7ed3\u679c\u3002\u9700\u8981\u8bf4\u660e\u7684\u662f\uff0c\r\n# \u5728MySQL \u4e2d\u7684\u67e5\u8be2\u7f13\u5b58\uff0c\u4e0d\u662f\u7f13\u5b58\u67e5\u8be2\u8ba1\u5212\uff0c\u800c\u662f\u67e5\u8be2\u5bf9\u5e94\u7684\u7ed3\u679c\u3002\u8fd9\u5c31\u610f\u5473\u7740\u67e5\u8be2\u5339\u914d\u7684 \u9c81\u68d2\u6027\u5927\u5927\u964d\u4f4e \uff0c\r\n# \u53ea\u6709 \u76f8\u540c\u7684\u67e5\u8be2\u64cd\u4f5c\u624d\u4f1a\u547d\u4e2d\u67e5\u8be2\u7f13\u5b58 \u3002\u4e24\u4e2a\u67e5\u8be2\u8bf7\u6c42\u5728\u4efb\u4f55\u5b57\u7b26\u4e0a\u7684\u4e0d\u540c\uff08\u4f8b\u5982\uff1a\u7a7a\u683c\u3001\u6ce8\u91ca\u3001\u5927\u5c0f\u5199\uff09\uff0c\r\n# \u90fd\u4f1a\u5bfc\u81f4\u7f13\u5b58\u4e0d\u4f1a\u547d\u4e2d\u3002\u56e0\u6b64 MySQL \u7684 \u67e5\u8be2\u7f13\u5b58\u547d\u4e2d\u7387\u4e0d\u9ad8 \u3002\r\n\r\n# \u540c\u65f6\uff0c\u5982\u679c\u67e5\u8be2\u8bf7\u6c42\u4e2d\u5305\u542b\u67d0\u4e9b\u7cfb\u7edf\u51fd\u6570\u3001\u7528\u6237\u81ea\u5b9a\u4e49\u53d8\u91cf\u548c\u51fd\u6570\u3001\u4e00\u4e9b\u7cfb\u7edf\u8868\uff0c\u5982 mysql \u3001\r\n# information_schema\u3001 performance_schema \u6570\u636e\u5e93\u4e2d\u7684\u8868\uff0c\u90a3\u8fd9\u4e2a\u8bf7\u6c42\u5c31\u4e0d\u4f1a\u88ab\u7f13\u5b58\u3002\r\n# \u4ee5\u67d0\u4e9b\u7cfb\u7edf\u51fd\u6570\u4e3e\u4f8b\uff0c\u53ef\u80fd\u540c\u6837\u7684\u51fd\u6570\u7684\u4e24\u6b21\u8c03\u7528\u4f1a\u4ea7\u751f\u4e0d\u4e00\u6837\u7684\u7ed3\u679c\uff0c\u6bd4\u5982\u51fd\u6570 NOW \uff0c\r\n# \u6bcf\u6b21\u8c03\u7528\u90fd\u4f1a\u4ea7\u751f\u6700\u65b0\u7684\u5f53\u524d\u65f6\u95f4\uff0c\u5982\u679c\u5728\u4e00\u4e2a\u67e5\u8be2\u8bf7\u6c42\u4e2d\u8c03\u7528\u4e86\u8fd9\u4e2a\u51fd\u6570\uff0c\u90a3\u5373\u4f7f\u67e5\u8be2\u8bf7\u6c42\u7684\u6587\u672c\u4fe1\u606f\u90fd\u4e00\u6837\uff0c\r\n# \u90a3\u4e0d\u540c\u65f6\u95f4\u7684\u4e24\u6b21\u67e5\u8be2\u4e5f\u5e94\u8be5\u5f97\u5230\u4e0d\u540c\u7684\u7ed3\u679c\uff0c\u5982\u679c\u5728\u7b2c\u4e00\u6b21\u67e5\u8be2\u65f6\u5c31\u7f13\u5b58\u4e86\uff0c\r\n# \u90a3\u7b2c\u4e8c\u6b21\u67e5\u8be2\u7684\u65f6\u5019\u76f4\u63a5\u4f7f\u7528\u7b2c\u4e00\u6b21\u67e5\u8be2\u7684\u7ed3\u679c\u5c31\u662f\u9519\u8bef\u7684\uff01\r\n\r\n# \u6b64\u5916\uff0c\u65e2\u7136\u662f\u7f13\u5b58\uff0c\u90a3\u5c31\u6709\u5b83 \u7f13\u5b58\u5931\u6548\u7684\u65f6\u5019 \u3002MySQL\u7684\u7f13\u5b58\u7cfb\u7edf\u4f1a\u76d1\u6d4b\u6d89\u53ca\u5230\u7684\u6bcf\u5f20\u8868\uff0c\r\n# \u53ea\u8981\u8be5\u8868\u7684\u7ed3\u6784\u6216\u8005\u6570\u636e\u88ab\u4fee\u6539\uff0c\u5982\u5bf9\u8be5\u8868\u4f7f\u7528\u4e86 INSERT \u3001 UPDATE \u3001 DELETE \u3001 TRUNCATE TABLE \u3001\r\n# ALTER TABLE\u3001DROP TABLE \u6216 DROP DATABASE \u8bed\u53e5\uff0c\r\n# \u90a3\u4f7f\u7528\u8be5\u8868\u7684\u6240\u6709\u9ad8\u901f\u7f13\u5b58\u67e5\u8be2\u90fd\u5c06\u53d8\u4e3a\u65e0\u6548\u5e76\u4ece\u9ad8\u901f\u7f13\u5b58\u4e2d\u5220\u9664\uff01\u5bf9\u4e8e \u66f4\u65b0\u538b\u529b\u5927\u7684\u6570\u636e\u5e93 \u6765\u8bf4\uff0c\r\n# \u67e5\u8be2\u7f13\u5b58\u7684\u547d\u4e2d\u7387\u4f1a\u975e\u5e38\u4f4e\u3002\r\n\r\n# 2. \u89e3\u6790\u5668\uff1a\u5728\u89e3\u6790\u5668\u4e2d\u5bf9 SQL \u8bed\u53e5\u8fdb\u884c\u8bed\u6cd5\u5206\u6790\u3001\u8bed\u4e49\u5206\u6790\u3002\r\n\r\n# \u5206\u6790\u5668\u5148\u505a\u201c \u8bcd\u6cd5\u5206\u6790 \u201d\u3002\u4f60\u8f93\u5165\u7684\u662f\u7531\u591a\u4e2a\u5b57\u7b26\u4e32\u548c\u7a7a\u683c\u7ec4\u6210\u7684\u4e00\u6761 SQL \u8bed\u53e5\uff0c\r\n# MySQL \u9700\u8981\u8bc6\u522b\u51fa\u91cc\u9762\u7684\u5b57\u7b26\u4e32\u5206\u522b\u662f\u4ec0\u4e48\uff0c\u4ee3\u8868\u4ec0\u4e48\u3002 MySQL \u4ece\u4f60\u8f93\u5165\u7684\"select\"\u8fd9\u4e2a\u5173\u952e\u5b57\u8bc6\u522b\u51fa\u6765\uff0c\r\n# \u8fd9\u662f\u4e00\u4e2a\u67e5\u8be2\u8bed\u53e5\u3002\u5b83\u4e5f\u8981\u628a\u5b57\u7b26\u4e32\u201cT\u201d\u8bc6\u522b\u6210\u201c\u8868\u540d T\u201d\uff0c\u628a\u5b57\u7b26\u4e32\u201cID\u201d\u8bc6\u522b\u6210\u201c\u5217 ID\u201d\u3002\r\n\r\n# \u63a5\u7740\uff0c\u8981\u505a\u201c \u8bed\u6cd5\u5206\u6790 \u201d\u3002\u6839\u636e\u8bcd\u6cd5\u5206\u6790\u7684\u7ed3\u679c\uff0c\u8bed\u6cd5\u5206\u6790\u5668\uff08\u6bd4\u5982\uff1aBison\uff09\u4f1a\u6839\u636e\u8bed\u6cd5\u89c4\u5219\uff0c\r\n# \u5224\u65ad\u4f60\u8f93\u5165\u7684\u8fd9\u4e2a SQL \u8bed\u53e5\u662f\u5426 \u6ee1\u8db3 MySQL \u8bed\u6cd5 \u3002\r\n\r\n# \u5982\u679cSQL\u8bed\u53e5\u6b63\u786e\uff0c\u5219\u4f1a\u751f\u6210\u4e00\u4e2a\u8fd9\u6837\u7684\u8bed\u6cd5\u6811\uff1a\r\n\r\n# 3. \u4f18\u5316\u5668\uff1a\u5728\u4f18\u5316\u5668\u4e2d\u4f1a\u786e\u5b9a SQL \u8bed\u53e5\u7684\u6267\u884c\u8def\u5f84\uff0c\u6bd4\u5982\u662f\u6839\u636e \u5168\u8868\u68c0\u7d22 \uff0c\u8fd8\u662f\u6839\u636e \u7d22\u5f15\u68c0\u7d22 \u7b49\u3002\r\n\r\n# \u5728\u67e5\u8be2\u4f18\u5316\u5668\u4e2d\uff0c\u53ef\u4ee5\u5206\u4e3a \u903b\u8f91\u67e5\u8be2 \u4f18\u5316\u9636\u6bb5\u548c \u7269\u7406\u67e5\u8be2 \u4f18\u5316\u9636\u6bb5\u3002\r\n\r\n# 4. \u6267\u884c\u5668\uff1a\r\n\r\n# \u622a\u6b62\u5230\u73b0\u5728\uff0c\u8fd8\u6ca1\u6709\u771f\u6b63\u53bb\u8bfb\u5199\u771f\u5b9e\u7684\u8868\uff0c\u4ec5\u4ec5\u53ea\u662f\u4ea7\u51fa\u4e86\u4e00\u4e2a\u6267\u884c\u8ba1\u5212\u3002\u4e8e\u662f\u5c31\u8fdb\u5165\u4e86 \u6267\u884c\u5668\u9636\u6bb5 \u3002\r\n\r\n# \u5728\u6267\u884c\u4e4b\u524d\u9700\u8981\u5224\u65ad\u8be5\u7528\u6237\u662f\u5426 \u5177\u5907\u6743\u9650 \u3002\u5982\u679c\u6ca1\u6709\uff0c\u5c31\u4f1a\u8fd4\u56de\u6743\u9650\u9519\u8bef\u3002\u5982\u679c\u5177\u5907\u6743\u9650\uff0c\r\n# \u5c31\u6267\u884c SQL\u67e5\u8be2\u5e76\u8fd4\u56de\u7ed3\u679c\u3002\u5728 MySQL8.0 \u4ee5\u4e0b\u7684\u7248\u672c\uff0c\u5982\u679c\u8bbe\u7f6e\u4e86\u67e5\u8be2\u7f13\u5b58\uff0c\u8fd9\u65f6\u4f1a\u5c06\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u7f13\u5b58\u3002\r\n\r\n# \u81f3\u6b64\uff0c\u8fd9\u4e2a\u8bed\u53e5\u5c31\u6267\u884c\u5b8c\u6210\u4e86\u3002\u5bf9\u4e8e\u6709\u7d22\u5f15\u7684\u8868\uff0c\u6267\u884c\u7684\u903b\u8f91\u4e5f\u5dee\u4e0d\u591a\u3002\r\n\r\n# SQL \u8bed\u53e5\u5728 MySQL \u4e2d\u7684\u6d41\u7a0b\u662f\uff1a SQL\u8bed\u53e5\u2192\u67e5\u8be2\u7f13\u5b58\u2192\u89e3\u6790\u5668\u2192\u4f18\u5316\u5668\u2192\u6267\u884c\u5668 \u3002\r\n\r\n# 2.2 MySQL8\u4e2dSQL\u6267\u884c\u539f\u7406\r\n\r\nSELECT @@profiling;\r\n\r\nSELECT @@session.profiling;\r\n\r\nSET PROFILING = 1;\r\n\r\nSELECT @@session.profiling;\r\n\r\nUSE atguigudb;\r\n\r\nSHOW TABLES;\r\n\r\nSELECT * FROM employees;\r\n\r\nSELECT * FROM employees;\r\n\r\nSHOW PROFILES;\r\n\r\nSHOW PROFILE;\r\n\r\nSHOW PROFILE FOR QUERY 7;\r\n\r\nSHOW PROFILE FOR QUERY 6;\r\n\r\n# MySQL5.7\u4e2dSQL\u6267\u884c\u539f\u7406\r\n\r\nSHOW VARIABLES LIKE '%query_cache_type';\r\n\r\nSELECT @@profiling;\r\n\r\nSET PROFILING = 1;\r\n\r\nSELECT @@profiling;\r\n\r\nSHOW DATABASES;\r\n\r\nUSE atguigudb;\r\n\r\nSHOW TABLES;\r\n\r\nSELECT * FROM departments;\r\n\r\nSELECT * FROM departments;\r\n\r\nSHOW PROFILES;\r\n\r\nSHOW PROFILE FOR QUERY 7;\r\n\r\nSHOW PROFILE FOR QUERY 8;\r\n\r\nSELECT * FROM departments WHERE department_id = 10;\r\n\r\nSELECT * FROM departments WHERE department_id =   10;\r\n\r\nSHOW PROFILES;\r\n\r\nSHOW PROFILE FOR QUERY 10;\r\n\r\nSHOW PROFILE FOR QUERY 11;\r\n\r\n# 3. \u6570\u636e\u5e93\u7f13\u51b2\u6c60(buffer pool)\r\n\r\n# InnoDB \u5b58\u50a8\u5f15\u64ce\u662f\u4ee5\u9875\u4e3a\u5355\u4f4d\u6765\u7ba1\u7406\u5b58\u50a8\u7a7a\u95f4\u7684\uff0c\r\n# \u6211\u4eec\u8fdb\u884c\u7684\u589e\u5220\u6539\u67e5\u64cd\u4f5c\u5176\u5b9e\u672c\u8d28\u4e0a\u90fd\u662f\u5728\u8bbf\u95ee\u9875\u9762\uff08\u5305\u62ec\u8bfb\u9875\u9762\u3001\u5199\u9875\u9762\u3001\u521b\u5efa\u65b0\u9875\u9762\u7b49\u64cd\u4f5c\uff09\u3002\r\n# \u800c\u78c1\u76d8 I\/O \u9700\u8981\u6d88\u8017\u7684\u65f6\u95f4\u5f88\u591a\uff0c\u800c\u5728\u5185\u5b58\u4e2d\u8fdb\u884c\u64cd\u4f5c\uff0c\u6548\u7387\u5219\u4f1a\u9ad8\u5f88\u591a\uff0c\r\n# \u4e3a\u4e86\u80fd\u8ba9\u6570\u636e\u8868\u6216\u8005\u7d22\u5f15\u4e2d\u7684\u6570\u636e\u968f\u65f6\u88ab\u6211\u4eec\u6240\u7528\uff0cDBMS \u4f1a\u7533\u8bf7 \u5360\u7528\u5185\u5b58\u6765\u4f5c\u4e3a\u6570\u636e\u7f13\u51b2\u6c60 \uff0c\r\n# \u5728\u771f\u6b63\u8bbf\u95ee\u9875\u9762\u4e4b\u524d\uff0c\u9700\u8981\u628a\u5728\u78c1\u76d8\u4e0a\u7684\u9875\u7f13\u5b58\u5230\u5185\u5b58\u4e2d\u7684 Buffer Pool \u4e4b\u540e\u624d\u53ef\u4ee5\u8bbf\u95ee\u3002\r\n\r\n# \u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\u53ef\u4ee5\u8ba9\u78c1\u76d8\u6d3b\u52a8\u6700\u5c0f\u5316\uff0c\u4ece\u800c \u51cf\u5c11\u4e0e\u78c1\u76d8\u76f4\u63a5\u8fdb\u884c I\/O \u7684\u65f6\u95f4 \u3002\u8981\u77e5\u9053\uff0c\r\n# \u8fd9\u79cd\u7b56\u7565\u5bf9\u63d0\u5347 SQL \u8bed\u53e5\u7684\u67e5\u8be2\u6027\u80fd\u6765\u8bf4\u81f3\u5173\u91cd\u8981\u3002\u5982\u679c\u7d22\u5f15\u7684\u6570\u636e\u5728\u7f13\u51b2\u6c60\u91cc\uff0c\u90a3\u4e48\u8bbf\u95ee\u7684\u6210\u672c\u5c31\u4f1a\u964d\u4f4e\u5f88\u591a\u3002\r\n\r\n# 3.1 \u7f13\u51b2\u6c60 vs \u67e5\u8be2\u7f13\u5b58\r\n# \u7f13\u51b2\u6c60\u548c\u67e5\u8be2\u7f13\u5b58\u662f\u4e00\u4e2a\u4e1c\u897f\u5417\uff1f\u4e0d\u662f\u3002\r\n\r\n# 1. \u7f13\u51b2\u6c60\uff08Buffer Pool\uff09\r\n# \u9996\u5148\u6211\u4eec\u9700\u8981\u4e86\u89e3\u5728 InnoDB \u5b58\u50a8\u5f15\u64ce\u4e2d\uff0c\u7f13\u51b2\u6c60\u90fd\u5305\u62ec\u4e86\u54ea\u4e9b\u3002\r\n# \u5728 InnoDB \u5b58\u50a8\u5f15\u64ce\u4e2d\u6709\u4e00\u90e8\u5206\u6570\u636e\u4f1a\u653e\u5230\u5185\u5b58\u4e2d\uff0c\u7f13\u51b2\u6c60\u5219\u5360\u4e86\u8fd9\u90e8\u5206\u5185\u5b58\u7684\u5927\u90e8\u5206\uff0c\r\n# \u5b83\u7528\u6765\u5b58\u50a8\u5404\u79cd\u6570\u636e\u7684\u7f13\u5b58\r\n\r\n# \u7f13\u5b58\u6c60\u7684\u91cd\u8981\u6027\uff1a\r\n# \u7f13\u5b58\u539f\u5219\uff1a\r\n# \u201c \u4f4d\u7f6e * \u9891\u6b21 \u201d\u8fd9\u4e2a\u539f\u5219\uff0c\u53ef\u4ee5\u5e2e\u6211\u4eec\u5bf9 I\/O \u8bbf\u95ee\u6548\u7387\u8fdb\u884c\u4f18\u5316\u3002\r\n\r\n# \u9996\u5148\uff0c\u4f4d\u7f6e\u51b3\u5b9a\u6548\u7387\uff0c\u63d0\u4f9b\u7f13\u51b2\u6c60\u5c31\u662f\u4e3a\u4e86\u5728\u5185\u5b58\u4e2d\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u6570\u636e\u3002\r\n\r\n# \u5176\u6b21\uff0c\u9891\u6b21\u51b3\u5b9a\u4f18\u5148\u7ea7\u987a\u5e8f\u3002\u56e0\u4e3a\u7f13\u51b2\u6c60\u7684\u5927\u5c0f\u662f\u6709\u9650\u7684\uff0c\u6bd4\u5982\u78c1\u76d8\u6709 200G\uff0c\u4f46\u662f\u5185\u5b58\u53ea\u6709 16G\uff0c\r\n# \u7f13\u51b2\u6c60\u5927\u5c0f\u53ea\u6709 1G\uff0c\u5c31\u65e0\u6cd5\u5c06\u6240\u6709\u6570\u636e\u90fd\u52a0\u8f7d\u5230\u7f13\u51b2\u6c60\u91cc\uff0c\u8fd9\u65f6\u5c31\u6d89\u53ca\u5230\u4f18\u5148\u7ea7\u987a\u5e8f\uff0c\r\n# \u4f1a \u4f18\u5148\u5bf9\u4f7f\u7528\u9891\u6b21\u9ad8\u7684\u70ed\u6570\u636e\u8fdb\u884c\u52a0\u8f7d \u3002\r\n\r\nSELECT * FROM employees;\r\n\r\n# 2. \u67e5\u8be2\u7f13\u5b58\r\n\r\n# \u90a3\u4e48\u4ec0\u4e48\u662f\u67e5\u8be2\u7f13\u5b58\u5462\uff1f\r\n\r\n# \u67e5\u8be2\u7f13\u5b58\u662f\u63d0\u524d\u628a \u67e5\u8be2\u7ed3\u679c\u7f13\u5b58 \u8d77\u6765\uff0c\u8fd9\u6837\u4e0b\u6b21\u4e0d\u9700\u8981\u6267\u884c\u5c31\u53ef\u4ee5\u76f4\u63a5\u62ff\u5230\u7ed3\u679c\u3002\u9700\u8981\u8bf4\u660e\u7684\u662f\uff0c\r\n# \u5728MySQL \u4e2d\u7684\u67e5\u8be2\u7f13\u5b58\uff0c\u4e0d\u662f\u7f13\u5b58\u67e5\u8be2\u8ba1\u5212\uff0c\u800c\u662f\u67e5\u8be2\u5bf9\u5e94\u7684\u7ed3\u679c\u3002\u56e0\u4e3a\u547d\u4e2d\u6761\u4ef6\u82db\u523b\uff0c\r\n# \u800c\u4e14\u53ea\u8981\u6570\u636e\u8868\u53d1\u751f\u53d8\u5316\uff0c\u67e5\u8be2\u7f13\u5b58\u5c31\u4f1a\u5931\u6548\uff0c\u56e0\u6b64\u547d\u4e2d\u7387\u4f4e\u3002\r\n\r\n# 3.2 \u7f13\u51b2\u6c60\u5982\u4f55\u8bfb\u53d6\u6570\u636e\r\n\r\n# \u7f13\u51b2\u6c60\u7ba1\u7406\u5668\u4f1a\u5c3d\u91cf\u5c06\u7ecf\u5e38\u4f7f\u7528\u7684\u6570\u636e\u4fdd\u5b58\u8d77\u6765\uff0c\u5728\u6570\u636e\u5e93\u8fdb\u884c\u9875\u9762\u8bfb\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\r\n# \u9996\u5148\u4f1a\u5224\u65ad\u8be5\u9875\u9762\u662f\u5426\u5728\u7f13\u51b2\u6c60\u4e2d\uff0c\u5982\u679c\u5b58\u5728\u5c31\u76f4\u63a5\u8bfb\u53d6\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\r\n# \u5c31\u4f1a\u901a\u8fc7\u5185\u5b58\u6216\u78c1\u76d8\u5c06\u9875\u9762\u5b58\u653e\u5230\u7f13\u51b2\u6c60\u4e2d\u518d\u8fdb\u884c\u8bfb\u53d6\u3002\r\n\r\n\r\n# \u67e5\u770b\/\u8bbe\u7f6e\u7f13\u51b2\u6c60\u7684\u5927\u5c0f\r\n\r\nSHOW VARIABLES LIKE 'innodb_buffer_pool_size';\r\n\r\nSET GLOBAL INNODB_BUFFER_POOL_SIZE = 268435456;\r\n\r\nSHOW VARIABLES LIKE 'innodb_buffer_pool_instances';<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[47],"class_list":["post-1605","post","type-post","status-publish","format-standard","hentry","category-mysql-code","tag-mysql"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1605"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1605"}],"version-history":[{"count":2,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1605\/revisions"}],"predecessor-version":[{"id":1674,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1605\/revisions\/1674"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1605"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1605"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1605"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}