{"id":174855,"date":"2024-11-08T00:19:21","date_gmt":"2024-11-07T16:19:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/174855\/"},"modified":"2024-11-08T00:19:22","modified_gmt":"2024-11-07T16:19:22","slug":"%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%b7mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e6%98%af%e5%90%a6%e5%bb%ba%e7%ab%8b%e4%ba%86%e7%b4%a2%e5%bc%95%ef%bc%9f-mysql%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%a4%e6%96%b7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/174855\/","title":{"rendered":"\u5982\u4f55\u5224\u65b7MySQL\u6578\u64da\u5eab\u662f\u5426\u5efa\u7acb\u4e86\u7d22\u5f15\uff1f (mysql\u6578\u64da\u5eab\u5224\u65b7\u7d22\u5f15\u5efa\u7acb)"},"content":{"rendered":"

\u5982\u4f55\u5224\u65b7MySQL\u6578\u64da\u5eab\u662f\u5426\u5efa\u7acb\u4e86\u7d22\u5f15\uff1f<\/h1>\n

\u5728\u4f7f\u7528MySQL\u6578\u64da\u5eab\u6642\uff0c\u7d22\u5f15\u7684\u5efa\u7acb\u5c0d\u65bc\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002\u7d22\u5f15\u53ef\u4ee5\u52a0\u901f\u6578\u64da\u6aa2\u7d22\uff0c\u6e1b\u5c11\u67e5\u8a62\u6642\u9593\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u7136\u800c\uff0c\u5982\u4f55\u5224\u65b7\u4e00\u500bMySQL\u6578\u64da\u5eab\u662f\u5426\u5df2\u7d93\u5efa\u7acb\u4e86\u7d22\u5f15\u5462\uff1f\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u7a2e\u6709\u6548\u7684\u65b9\u6cd5\u4f86\u6aa2\u67e5MySQL\u6578\u64da\u5eab\u4e2d\u7684\u7d22\u5f15\u60c5\u6cc1\u3002<\/p>\n

1. \u4f7f\u7528SHOW INDEX\u547d\u4ee4<\/h2>\n

\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u4f7f\u7528MySQL\u7684\u5167\u5efa\u547d\u4ee4SHOW INDEX\u3002\u9019\u500b\u547d\u4ee4\u53ef\u4ee5\u986f\u793a\u6307\u5b9a\u8868\u7684\u6240\u6709\u7d22\u5f15\u4fe1\u606f\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u8a72\u547d\u4ee4\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n

SHOW INDEX FROM \u8868\u540d;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cusers\u201d\u7684\u8868\uff0c\u53ef\u4ee5\u9019\u6a23\u67e5\u8a62\uff1a<\/p>\n
SHOW INDEX FROM users;<\/code><\/pre>\n
\u57f7\u884c\u5f8c\uff0cMySQL\u6703\u8fd4\u56de\u4e00\u500b\u7d50\u679c\u96c6\uff0c\u5176\u4e2d\u5305\u542b\u7d22\u5f15\u7684\u540d\u7a31\u3001\u985e\u578b\u3001\u552f\u4e00\u6027\u3001\u5217\u540d\u7b49\u4fe1\u606f\u3002\u9019\u4e9b\u4fe1\u606f\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u4e86\u89e3\u8a72\u8868\u662f\u5426\u5df2\u7d93\u5efa\u7acb\u4e86\u7d22\u5f15\uff0c\u4ee5\u53ca\u7d22\u5f15\u7684\u5177\u9ad4\u60c5\u6cc1\u3002<\/p>\n
2. \u4f7f\u7528INFORMATION_SCHEMA<\/h2>\n
\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u67e5\u8a62INFORMATION_SCHEMA\u6578\u64da\u5eab\u4e2d\u7684TABLE_CONSTRAINTS\u548cKEY_COLUMN_USAGE\u8868\u3002\u9019\u4e9b\u8868\u63d0\u4f9b\u4e86\u6709\u95dc\u6578\u64da\u5eab\u4e2d\u6240\u6709\u8868\u7684\u7d04\u675f\u548c\u7d22\u5f15\u7684\u8a73\u7d30\u4fe1\u606f\u3002\u4ee5\u4e0b\u662f\u67e5\u8a62\u7d22\u5f15\u7684\u793a\u4f8b\uff1a<\/p>\n
SELECT * \nFROM INFORMATION_SCHEMA.STATISTICS \nWHERE TABLE_SCHEMA = '\u6578\u64da\u5eab\u540d' AND TABLE_NAME = '\u8868\u540d';<\/code><\/pre>\n
\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u6307\u5b9a\u6578\u64da\u5eab\u548c\u8868\u7684\u6240\u6709\u7d22\u5f15\u4fe1\u606f\uff0c\u5305\u62ec\u7d22\u5f15\u7684\u540d\u7a31\u3001\u5217\u540d\u3001\u7d22\u5f15\u985e\u578b\u7b49\u3002<\/p>\n
3. \u4f7f\u7528EXPLAIN\u547d\u4ee4<\/h2>\n
EXPLAIN\u547d\u4ee4\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u5206\u6790\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u5f9e\u800c\u5224\u65b7\u662f\u5426\u4f7f\u7528\u4e86\u7d22\u5f15\u3002\u7576\u6211\u5011\u5728\u57f7\u884c\u67e5\u8a62\u6642\uff0c\u53ef\u4ee5\u5728\u67e5\u8a62\u524d\u52a0\u4e0aEXPLAIN\u95dc\u9375\u5b57\uff1a<\/p>\n
EXPLAIN SELECT * FROM users WHERE age = 30;<\/code><\/pre>\n
\u57f7\u884c\u5f8c\uff0cMySQL\u6703\u8fd4\u56de\u4e00\u500b\u7d50\u679c\u96c6\uff0c\u5176\u4e2d\u5305\u542b\u6709\u95dc\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\u7684\u4fe1\u606f\u3002\u5982\u679c\u67e5\u8a62\u4f7f\u7528\u4e86\u7d22\u5f15\uff0c\u5247\u5728\u7d50\u679c\u4e2d\u6703\u986f\u793a\u4f7f\u7528\u7684\u7d22\u5f15\u540d\u7a31\uff0c\u9019\u6a23\u6211\u5011\u5c31\u53ef\u4ee5\u5224\u65b7\u7d22\u5f15\u662f\u5426\u6709\u6548\u3002<\/p>\n
4. \u4f7f\u7528\u6027\u80fd\u5206\u6790\u5de5\u5177<\/h2>\n
\u9664\u4e86\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u9084\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u6027\u80fd\u5206\u6790\u5de5\u5177\u4f86\u6aa2\u67e5\u7d22\u5f15\u7684\u4f7f\u7528\u60c5\u6cc1\u3002\u4f8b\u5982\uff0cMySQL\u7684\u6162\u67e5\u8a62\u65e5\u8a8c\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u8b58\u5225\u672a\u4f7f\u7528\u7d22\u5f15\u7684\u67e5\u8a62\uff0c\u5f9e\u800c\u9032\u4e00\u6b65\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\u3002\u555f\u7528\u6162\u67e5\u8a62\u65e5\u8a8c\u5f8c\uff0c\u53ef\u4ee5\u901a\u904e\u5206\u6790\u65e5\u8a8c\u6587\u4ef6\u4f86\u627e\u51fa\u54ea\u4e9b\u67e5\u8a62\u672a\u80fd\u6709\u6548\u5229\u7528\u7d22\u5f15\u3002<\/p>\n
5. \u5b9a\u671f\u6aa2\u67e5\u548c\u512a\u5316\u7d22\u5f15<\/h2>\n
\u5728\u6578\u64da\u5eab\u904b\u884c\u904e\u7a0b\u4e2d\uff0c\u6578\u64da\u7684\u589e\u522a\u6539\u6703\u5f71\u97ff\u7d22\u5f15\u7684\u6709\u6548\u6027\u3002\u56e0\u6b64\uff0c\u5b9a\u671f\u6aa2\u67e5\u548c\u512a\u5316\u7d22\u5f15\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u53ef\u4ee5\u4f7f\u7528OPTIMIZE TABLE\u547d\u4ee4\u4f86\u91cd\u5efa\u7d22\u5f15\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff1a<\/p>\n
OPTIMIZE TABLE \u8868\u540d;<\/code><\/pre>\n
\u9019\u6a23\u7684\u64cd\u4f5c\u53ef\u4ee5\u6e05\u7406\u788e\u7247\uff0c\u63d0\u5347\u7d22\u5f15\u7684\u6548\u7387\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u5224\u65b7MySQL\u6578\u64da\u5eab\u662f\u5426\u5efa\u7acb\u4e86\u7d22\u5f15\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u4e00\u500b\u91cd\u8981\u6b65\u9a5f\u3002\u901a\u904e\u4f7f\u7528SHOW INDEX\u547d\u4ee4\u3001\u67e5\u8a62INFORMATION_SCHEMA\u3001\u4f7f\u7528EXPLAIN\u547d\u4ee4\u4ee5\u53ca\u6027\u80fd\u5206\u6790\u5de5\u5177\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\u6aa2\u67e5\u548c\u512a\u5316\u7d22\u5f15\u3002\u5b9a\u671f\u7684\u6aa2\u67e5\u548c\u512a\u5316\u5c07\u6709\u52a9\u65bc\u4fdd\u6301\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\uff0c\u63d0\u5347\u696d\u52d9\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u5224\u65b7MySQL\u6578\u64da\u5eab\u662f\u5426\u5efa\u7acb\u7d22\u5f15\uff0c\u900f\u904e\u67e5\u8a62\u7cfb\u7d71\u8868\u548c\u4f7f\u7528EXPLAIN\u547d\u4ee4\u4f86\u6aa2\u67e5\u7d22\u5f15\u72c0\u614b\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-174855","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174855","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=174855"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174855\/revisions"}],"predecessor-version":[{"id":174856,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/174855\/revisions\/174856"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=174855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=174855"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=174855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}