{"id":7276,"date":"2023-11-28T18:22:22","date_gmt":"2023-11-28T10:22:22","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=7276"},"modified":"2023-11-28T18:27:27","modified_gmt":"2023-11-28T10:27:27","slug":"mysql-zhong-suo-yin-fu-gai-hui-biao-deng-zhe-xie-l","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/mysql-zhong-suo-yin-fu-gai-hui-biao-deng-zhe-xie-l\/","title":{"rendered":"MySQL\u4e2d\u7d22\u5f15\u8986\u76d6\u3001\u56de\u8868\u7b49\u8fd9\u4e9b\uff0c\u4e86\u89e3\u8fc7\u5417\uff1f"},"content":{"rendered":"<p>\u7d22\u5f15\u7c7b\u578b<br \/>\n\u7d22\u5f15\u7c7b\u578b\u5206\u4e3a\u4e3b\u952e\u7d22\u5f15\u548c\u975e\u4e3b\u952e\u7d22\u5f15\u3002(\u4e00\u5b9a\u8981\u7262\u8bb0\uff0c\u662f\u600e\u4e48\u5b58\u50a8\u6570\u636e\u7684)<br \/>\n1\u3001  \u4e3b\u952e\u7d22\u5f15\u7684\u53f6\u5b50\u8282\u70b9\u5b58\u7684\u662f\u6574\u884c\u6570\u636e\u3002\u5728InnoDB\u91cc\uff0c\u4e3b\u952e\u7d22\u5f15\u4e5f\u88ab\u79f0\u4e3a\u805a\u7c07\u7d22\u5f15(clustered index)\u3002<br \/>\n2\u3001  \u975e\u4e3b\u952e\u7d22\u5f15\u7684\u53f6\u5b50\u8282\u70b9\u5185\u5bb9\u662f\u4e3b\u952e\u7684\u503c\u3002\u5728InnoDB\u91cc\uff0c\u975e\u4e3b\u952e\u7d22\u5f15\u4e5f\u88ab\u79f0\u4e3a\u4e8c\u7ea7\u7d22\u5f15<br \/>\n(secondary index)\u3002<br \/>\n\u805a\u7c07\u7d22\u5f15<br \/>\n\u805a\u7c07\u7d22\u5f15\u9ed8\u8ba4\u662f\u4e3b\u952e\uff0c\u5982\u679c\u8868\u4e2d\u6ca1\u6709\u5b9a\u4e49\u4e3b\u952e\uff0cInnoDB\u4f1a\u9009\u62e9\u4e00\u4e2a\u552f\u4e00\u7684\u975e\u7a7a\u7d22\u5f15\u4ee3\u66ff\u3002\u5982\u679c\u6ca1\u6709\u8fd9\u6837\u7684\u7d22\u5f15\uff0cInnoDB\u4f1a\u9690\u5f0f\u5b9a\u4e49\u4e00\u4e2a\u4e3b\u952e\u6765\u4f5c\u4e3a\u805a\u7c07\u7d22\u5f15\u3002<br \/>\n\u56e0\u4e3aB+TREE\u7684\u539f\u56e0\uff0c\u6700\u597d\u4f7f\u7528\u8fde\u7eed\u7684\u6574\u6570\u5b57\u6bb5\uff0c\u66f4\u597d\u786e\u5b9a\u67e5\u627e\u8bbf\u95ee\u8303\u56f4<br \/>\n\u56de\u8868<br \/>\n\u6839\u636e\u4e0a\u9762\u7684\u7d22\u5f15\u7ed3\u6784\u8bf4\u660e\uff0c\u4e3b\u952e\u7d22\u5f15\u548c\u666e\u901a\u7d22\u5f15\u7684\u67e5\u8be2\u533a\u522b<br \/>\n1\u3001  \u5982\u679c\u8bed\u53e5\u662fselect * from T where ID=500,\u5373\u4e3b\u952e\u67e5\u8be2\u65b9\u5f0f\uff0c\u5219\u53ea\u9700\u8981\u635c\u7d22ID\u8fd9\u68f5B+ \u6811\uff1b<br \/>\n2\u3001  \u5982\u679c\u8bed\u53e5\u662fselect * from T where k=5,\u5373\u666e\u901a\u7d22\u5f15\u67e5\u8be2\u65b9\u5f0f\uff0c\u5219\u9700\u8981\u5148\u641c\u7d22k\u7d22\u5f15\u6811\uff0c\u5f97\u5230ID\u7684\u503c\u4e3a500,\u518d\u5230ID\u7d22\u5f15\u6811\u635c\u7d22\u4e00\u6b21\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u79f0\u4e3a\u56de\u8868\u3002<br \/>\n\u8986\u76d6\u7d22\u5f15<br \/>\n\u5982\u679c\u6267\u884c\u7684\u8bed\u53e5\u662fselect ID from T where k between 3 and 5,\u8fd9\u65f6\u53ea\u9700\u8981\u67e5ID\u7684\u503c\uff0c \u800cID\u7684\u503c\u5df2\u7ecf\u5728k\u7d22\u5f15\u6811\u4e0a\u4e86\uff0c\u56e0\u6b64\u53ef\u4ee5\u76f4\u63a5\u63d0\u4f9b\u67e5\u8be2\u7ed3\u679c\uff0c\u4e0d\u9700\u8981\u56de\u8868\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728 \u8fd9\u4e2a\u67e5\u8be2\u91cc\u9762\uff0c\u7d22\u5f15k\u5df2\u7ecf\u201c\u8986\u76d6\u4e86\u201d\u6211\u4eec\u7684\u67e5\u8be2\u9700\u6c42\uff0c\u6211\u4eec\u79f0\u4e3a\u8986\u76d6\u7d22\u5f15\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7d22\u5f15\u7c7b\u578b \u7d22\u5f15\u7c7b\u578b\u5206\u4e3a\u4e3b\u952e\u7d22\u5f15\u548c\u975e\u4e3b\u952e\u7d22\u5f15\u3002(\u4e00\u5b9a\u8981\u7262\u8bb0\uff0c\u662f\u600e\u4e48\u5b58\u50a8\u6570\u636e\u7684) 1\u3001 \u4e3b\u952e\u7d22\u5f15\u7684\u53f6\u5b50\u8282\u70b9\u5b58\u7684\u662f\u6574 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[102],"tags":[],"class_list":["post-7276","post","type-post","status-publish","format-standard","hentry","category-db"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/7276","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=7276"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/7276\/revisions"}],"predecessor-version":[{"id":7285,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/7276\/revisions\/7285"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=7276"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=7276"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=7276"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}