{"id":163709,"date":"2024-11-05T01:46:24","date_gmt":"2024-11-04T17:46:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/163709\/"},"modified":"2024-11-05T01:46:25","modified_gmt":"2024-11-04T17:46:25","slug":"%e8%a7%a3%e6%b1%basql%e6%95%b8%e6%93%9a%e5%ba%ab%e7%aa%81%e7%84%b6%e8%ae%8a%e6%85%a2%e7%9a%84%e5%95%8f%e9%a1%8c-sql%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%8d%e5%ae%9a%e6%99%82%e8%ae%8a%e6%85%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/163709\/","title":{"rendered":"\u89e3\u6c7aSQL\u6578\u64da\u5eab\u7a81\u7136\u8b8a\u6162\u7684\u554f\u984c (sql\u6578\u64da\u5eab\u4e0d\u5b9a\u6642\u8b8a\u6162)"},"content":{"rendered":"

\u89e3\u6c7aSQL\u6578\u64da\u5eab\u7a81\u7136\u8b8a\u6162\u7684\u554f\u984c<\/h1>\n

\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cSQL\u6578\u64da\u5eab\u662f\u8a31\u591a\u61c9\u7528\u7a0b\u5e8f\u548c\u7db2\u7ad9\u7684\u6838\u5fc3\u7d44\u4ef6\u3002\u7136\u800c\uff0c\u96a8\u8457\u6642\u9593\u7684\u63a8\u79fb\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u53ef\u80fd\u6703\u51fa\u73fe\u4e0b\u964d\uff0c\u5c0e\u81f4\u67e5\u8a62\u901f\u5ea6\u8b8a\u6162\u3002\u9019\u7a2e\u60c5\u6cc1\u4e0d\u50c5\u5f71\u97ff\u7528\u6236\u9ad4\u9a57\uff0c\u9084\u53ef\u80fd\u5c0d\u696d\u52d9\u904b\u71df\u9020\u6210\u8ca0\u9762\u5f71\u97ff\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5c0e\u81f4SQL\u6578\u64da\u5eab\u6027\u80fd\u4e0b\u964d\u7684\u5e38\u898b\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n

\u5e38\u898b\u539f\u56e0<\/h2>\n

1. \u67e5\u8a62\u6548\u7387\u4f4e\u4e0b<\/h3>\n

\u4e0d\u7576\u7684\u67e5\u8a62\u8a2d\u8a08\u662f\u5c0e\u81f4\u6578\u64da\u5eab\u6027\u80fd\u4e0b\u964d\u7684\u4e3b\u8981\u539f\u56e0\u4e4b\u4e00\u3002\u8907\u96dc\u7684\u67e5\u8a62\u3001\u7f3a\u4e4f\u7d22\u5f15\u6216\u4e0d\u5408\u7406\u7684JOIN\u64cd\u4f5c\u90fd\u53ef\u80fd\u5c0e\u81f4\u67e5\u8a62\u57f7\u884c\u6642\u9593\u904e\u9577\u3002<\/p>\n

SELECT * FROM orders WHERE customer_id = 12345;<\/code><\/pre>\n
\u4e0a\u8ff0\u67e5\u8a62\u5728\u6c92\u6709\u9069\u7576\u7d22\u5f15\u7684\u60c5\u6cc1\u4e0b\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u5168\u8868\u6383\u63cf\uff0c\u5f9e\u800c\u5f71\u97ff\u6027\u80fd\u3002\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u53ef\u4ee5\u8003\u616e\u6dfb\u52a0\u7d22\u5f15\uff1a<\/p>\n
CREATE INDEX idx_customer_id ON orders(customer_id);<\/code><\/pre>\n
2. \u6578\u64da\u5eab\u914d\u7f6e\u4e0d\u7576<\/h3>\n
\u6578\u64da\u5eab\u7684\u914d\u7f6e\u53c3\u6578\u5c0d\u6027\u80fd\u6709\u8457\u91cd\u8981\u5f71\u97ff\u3002\u4f8b\u5982\uff0c\u5167\u5b58\u5206\u914d\u3001\u9023\u63a5\u6578\u91cf\u548c\u7de9\u5b58\u8a2d\u7f6e\u7b49\u90fd\u9700\u8981\u6839\u64da\u5be6\u969b\u9700\u6c42\u9032\u884c\u8abf\u6574\u3002\u5982\u679c\u914d\u7f6e\u4e0d\u7576\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u8cc7\u6e90\u6d6a\u8cbb\u6216\u74f6\u9838\u3002<\/p>\n
3. \u786c\u4ef6\u8cc7\u6e90\u4e0d\u8db3<\/h3>\n
\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u539f\u6709\u7684\u786c\u4ef6\u8cc7\u6e90\u53ef\u80fd\u7121\u6cd5\u6eff\u8db3\u9700\u6c42\u3002CPU\u3001\u5167\u5b58\u548c\u78c1\u789fI\/O\u7684\u74f6\u9838\u90fd\u6703\u5c0e\u81f4\u6578\u64da\u5eab\u6027\u80fd\u4e0b\u964d\u3002\u5b9a\u671f\u76e3\u63a7\u786c\u4ef6\u8cc7\u6e90\u7684\u4f7f\u7528\u60c5\u6cc1\u662f\u5fc5\u8981\u7684\u3002<\/p>\n
4. \u6578\u64da\u5eab\u788e\u7247\u5316<\/h3>\n
\u96a8\u8457\u6578\u64da\u7684\u589e\u9577\u548c\u522a\u9664\uff0c\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u9801\u9762\u53ef\u80fd\u6703\u8b8a\u5f97\u788e\u7247\u5316\uff0c\u9019\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\u3002\u5b9a\u671f\u9032\u884c\u6578\u64da\u5eab\u7dad\u8b77\uff0c\u5982\u91cd\u5efa\u7d22\u5f15\u548c\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\uff0c\u53ef\u4ee5\u5e6b\u52a9\u6e1b\u5c11\u788e\u7247\u5316\u7684\u5f71\u97ff\u3002<\/p>\n
ALTER INDEX idx_customer_id REBUILD;<\/code><\/pre>\n
\u89e3\u6c7a\u65b9\u6848<\/h2>\n
1. \u512a\u5316\u67e5\u8a62<\/h3>\n
\u5c0d\u65bc\u6027\u80fd\u8f03\u5dee\u7684\u67e5\u8a62\uff0c\u61c9\u9032\u884c\u5206\u6790\u548c\u512a\u5316\u3002\u4f7f\u7528\u6578\u64da\u5eab\u7684\u67e5\u8a62\u5206\u6790\u5de5\u5177\uff08\u5982EXPLAIN\uff09\u4f86\u6aa2\u67e5\u67e5\u8a62\u8a08\u5283\uff0c\u627e\u51fa\u6027\u80fd\u74f6\u9838\u3002<\/p>\n
2. \u8abf\u6574\u6578\u64da\u5eab\u914d\u7f6e<\/h3>\n
\u6839\u64da\u5be6\u969b\u4f7f\u7528\u60c5\u6cc1\uff0c\u8abf\u6574\u6578\u64da\u5eab\u7684\u914d\u7f6e\u53c3\u6578\u3002\u4f8b\u5982\uff0c\u589e\u52a0\u7de9\u5b58\u5927\u5c0f\u6216\u8abf\u6574\u6700\u5927\u9023\u63a5\u6578\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n
3. \u5347\u7d1a\u786c\u4ef6<\/h3>\n
\u5982\u679c\u767c\u73fe\u786c\u4ef6\u8cc7\u6e90\u4e0d\u8db3\uff0c\u53ef\u4ee5\u8003\u616e\u5347\u7d1a\u786c\u4ef6\uff0c\u4f8b\u5982\u589e\u52a0\u5167\u5b58\u6216\u4f7f\u7528\u66f4\u5feb\u7684SSD\u4f86\u63d0\u9ad8I\/O\u6027\u80fd\u3002<\/p>\n
4. \u5b9a\u671f\u7dad\u8b77<\/h3>\n
\u5b9a\u671f\u9032\u884c\u6578\u64da\u5eab\u7dad\u8b77\u5de5\u4f5c\uff0c\u5305\u62ec\u91cd\u5efa\u7d22\u5f15\u3001\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\u548c\u6e05\u7406\u904e\u671f\u6578\u64da\uff0c\u4ee5\u4fdd\u6301\u6578\u64da\u5eab\u7684\u5065\u5eb7\u72c0\u614b\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
SQL\u6578\u64da\u5eab\u6027\u80fd\u4e0b\u964d\u662f\u4e00\u500b\u5e38\u898b\u554f\u984c\uff0c\u4f46\u901a\u904e\u9069\u7576\u7684\u67e5\u8a62\u512a\u5316\u3001\u914d\u7f6e\u8abf\u6574\u3001\u786c\u4ef6\u5347\u7d1a\u548c\u5b9a\u671f\u7dad\u8b77\uff0c\u53ef\u4ee5\u6709\u6548\u89e3\u6c7a\u9019\u4e9b\u554f\u984c\u3002\u4fdd\u6301\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\u4e0d\u50c5\u80fd\u63d0\u5347\u7528\u6236\u9ad4\u9a57\uff0c\u9084\u80fd\u4fc3\u9032\u696d\u52d9\u7684\u7a69\u5b9a\u767c\u5c55\u3002\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u652f\u6301\u6216\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u6216\u96f2\u4f3a\u670d\u5668<\/a>\u4f86\u63d0\u5347\u60a8\u7684\u6578\u64da\u5eab\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u89e3\u6c7aSQL\u6578\u64da\u5eab\u7a81\u7136\u8b8a\u6162\u7684\u554f\u984c\uff0c\u63a2\u7d22\u5e38\u898b\u539f\u56e0\u53ca\u6709\u6548\u7684\u512a\u5316\u7b56\u7565\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\uff0c\u78ba\u4fdd\u7a69\u5b9a\u904b\u884c\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-163709","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/163709","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=163709"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/163709\/revisions"}],"predecessor-version":[{"id":163710,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/163709\/revisions\/163710"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=163709"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=163709"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=163709"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}