{"id":8777,"date":"2023-05-01T22:37:03","date_gmt":"2023-05-01T14:37:03","guid":{"rendered":"https:\/\/www.orczhou.com\/?p=8777"},"modified":"2023-05-01T22:37:46","modified_gmt":"2023-05-01T14:37:46","slug":"mysql-8-0-invisible-indexes","status":"publish","type":"post","link":"https:\/\/www.orczhou.com\/index.php\/2023\/05\/mysql-8-0-invisible-indexes\/","title":{"rendered":"MySQL\u7684\u4e0d\u53ef\u89c1\u7d22\u5f15"},"content":{"rendered":"\n<p>\u4e0d\u53ef\u89c1\u7d22\u5f15\uff08Invisible Indexes\uff09MySQL 8.0\u4e4b\u540e\u5f15\u5165\u7684\u4e00\u4e2a\u91cd\u8981\u7279\u6027\u3002\u4e5f\u53ef\u4ee5\u5e2e\u52a9DBA\u6216\u8005\u5f00\u53d1\u8005\u66f4\u597d\u7684\u7ba1\u7406\u548c\u7ef4\u62a4\u6570\u636e\u5e93\u7684\u7d22\u5f15\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u4e0d\u53ef\u89c1\u7d22\u5f15\u7684\u4e00\u4e9b\u5e38\u89c1\u4f7f\u7528\u573a\u666f\u548c\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u66f4\u52a0\u5b89\u5168\u7684\u5220\u9664\u6ca1\u7528\u7684\u7d22\u5f15<\/h4>\n\n\n\n<p>\u901a\u5e38\uff0c\u7ebf\u4e0a\u8fd0\u884c\u65f6\u95f4\u8f83\u957f\u7684\u7cfb\u7edf\uff0c\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\u4f7f\u7528\u7edf\u8ba1\u4fe1\u606f\u77e5\u9053\u54ea\u4e9b\u7d22\u5f15\u662f\u4ece\u6765\u4e0d\u88ab\u4f7f\u7528\u7684\uff0c\u4f46\u4f9d\u65e7\u4f1a\u5360\u7528\u78c1\u76d8\u7a7a\u95f4\uff0c\u5e76\u4e14\u4f1a\u5f71\u54cd\u7cfb\u7edf\u7684\u5199\u5165\/\u66f4\u65b0\/\u5220\u9664\u64cd\u4f5c\u7684\u6027\u80fd\u3002\u4f46\u662f\u5220\u9664\u7d22\u5f15\u7684\u64cd\u4f5c\uff0c\u6709\u65f6\u5019\u4e5f\u4f1a\u5e26\u6765\u610f\u60f3\u4e0d\u5230\u7684\u7cfb\u7edf\u6027\u80fd\u4e0b\u964d\uff0c\u6240\u4ee5\uff0c\u5728\u6b63\u5f0f\u5220\u9664\u4e4b\u524d\uff0c\u53ef\u4ee5\u5148\u5c06\u7d22\u5f15\u4fee\u6539\u4e3a\u4e0d\u53ef\u7528\uff0c\u5f85\u89c2\u5bdf\u6570\u65e5\u540e\u518d\u8fdb\u884c\u5220\u9664\uff0c\u4f1a\u66f4\u52a0\u5b89\u5168\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u6027\u80fd\u5206\u6790<\/h4>\n\n\n\n<p>\u6709\u65f6\u5019\u5728\u5bf9\u7ebf\u4e0a\u7cfb\u7edf\u8fdb\u884cSQL\u6027\u80fd\u5206\u6790\u65f6\uff0c\u6709\u65f6\u5019\u4e3a\u4e86\u6392\u9664\u67d0\u4e9b\u7d22\u5f15\u5bf9\u67e5\u8be2\u6027\u80fd\u5f71\u54cd\u65f6\uff0c\u53ef\u4ee5\u6682\u65f6\u7684\u5c06\u67d0\u4e9b\u7d22\u5f15\u6682\u65f6\u6807\u8bb0\u4e3a\u4e0d\u53ef\u7528\uff0c\u518d\u7edf\u8ba1\u6b64\u65f6\u7684SQL\u6267\u884c\u65f6\u957f\u4e0e\u6027\u80fd\u3002\u7136\u540e\uff0c\u518d\u5c06\u7d22\u5f15\u7f6e\u4e3a\u53ef\u89c1\uff0c\u518d\u6b21\u6267\u884cSQL\uff0c\u5e76\u7edf\u8ba1\u6267\u884c\u65f6\u957f\u4e0e\u6027\u80fd\u3002<\/p>\n\n\n\n<p>\u901a\u8fc7\u8fd9\u6837\u5bf9\u6bd4\uff0c\u53ef\u4ee5\u975e\u5e38\u7b80\u5355\u76f4\u89c2\u3001\u91cf\u5316\u7684\u89c2\u5bdf\u5230\u7d22\u5f15\u5bf9\u5bf9\u4e8e\u5177\u4f53SQL\u6027\u80fd\u7684\u63d0\u5347\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u4e0d\u53ef\u89c1\u7d22\u5f15\u4f9d\u65e7\u4f1a\u6709\u7ef4\u62a4\u6210\u672c<\/h4>\n\n\n\n<p>\u867d\u7136\u4e0d\u53ef\u89c1\u7d22\u5f15\u4e0d\u4f1a\u88ab\u67e5\u8be2\u4f18\u5316\u5668\u4f7f\u7528\uff0c\u4f46\u5728\u5bf9\u6570\u636e\u8fdb\u884cDML\u64cd\u4f5c\uff08\u5982\uff1a\u63d2\u5165\u3001\u66f4\u65b0\u3001\u5220\u9664\uff09\u65f6\u4ecd\u4f1a\u88ab\u7ef4\u62a4\u3002\u8fd9\u610f\u5473\u7740\u4e0d\u53ef\u89c1\u7d22\u5f15\u53ef\u80fd\u4f1a\u5bf9\u6570\u636e\u5e93\u6027\u80fd\u4ea7\u751f\u4e00\u5b9a\u5f71\u54cd\u3002\u5728\u4f7f\u7528\u4e0d\u53ef\u89c1\u7d22\u5f15\u8fdb\u884c\u6027\u80fd\u6d4b\u8bd5\u6216\u5206\u6790\u65f6\uff0c\u8bf7\u52a1\u5fc5\u6743\u8861\u8fd9\u4e00\u70b9\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u4e0d\u5efa\u8bae\u957f\u671f\u4fdd\u7559\u4e0d\u53ef\u89c1\u7d22\u5f15<\/h4>\n\n\n\n<p>\u5982\u679c\u786e\u5b9a\u67d0\u4e2a\u4e0d\u53ef\u89c1\u7d22\u5f15\u5bf9\u67e5\u8be2\u6027\u80fd\u6ca1\u6709\u5e2e\u52a9\uff0c\u5efa\u8bae\u5c3d\u65e9\u5220\u9664\u8be5\u7d22\u5f15\uff0c\u4ee5\u8282\u7701\u5b58\u50a8\u7a7a\u95f4\u548c\u51cf\u5c0f\u7ef4\u62a4\u6210\u672c\u3002\u5426\u5219\uff0c\u8be5\u7d22\u5f15\u5bf9\u7cfb\u7edf\u6027\u80fd\u6ca1\u6709\u8d77\u5230\u4efb\u4f55\u6b63\u9762\u4f5c\u7528\uff0c\u53cd\u800c\u4f1a\u5360\u7528\u7a7a\u95f4\uff0c\u5e76\u5f71\u54cdDML\u7684\u6027\u80fd\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u4f18\u5316\u5668\u9009\u9879\u53ef\u4ee5\u8ba9\u4e0d\u53ef\u89c1\u7d22\u5f15\u751f\u6548<\/h4>\n\n\n\n<p>\u5728\u4f18\u5316\u5668\u9009\u9879\uff08<a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/server-system-variables.html#sysvar_optimizer_switch\">optimizer_switch<\/a>\uff09\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u6253\u5f00\u6807\u8bb0\u4f4d\uff08use_invisible_indexes\uff09\uff0c\u6765\u5f3a\u5236\u4f18\u5316\u5668\u5ffd\u7565\u7d22\u5f15\u7684\u4e0d\u53ef\u89c1\u5c5e\u6027\uff0c\u8fd9\u5728\u589e\u52a0\u4e86SQL\u6027\u80fd\u8c03\u8bd5\u65f6\u7684\u7075\u6d3b\u6027\u3002<\/p>\n\n\n\n<p>\u53ef\u4ee5\u901a\u8fc7SELECT\/SHOW\u547d\u4ee4\u67e5\u8be2\u4f18\u5316\u5668\u9009\u9879\uff0c\u4e5f\u53ef\u7528\u901a\u8fc7SET\u547d\u4ee4\u53d8\u66f4\u8be5\u9009\u9879\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">SET [GLOBAL|SESSION] optimizer_switch='command[,command]...';\n\nSET SESSION optimizer_switch = 'use_invisible_indexes=ON';<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0d\u53ef\u89c1\u7d22\u5f15\uff08Invisible Indexes\uff09MySQL 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\u53ef\u4ee5\u901a\u8fc7SELECT\/SHOW\u547d\u4ee4\u67e5\u8be2\u4f18\u5316\u5668\u9009\u9879\uff0c\u4e5f\u53ef\u7528\u901a\u8fc7SET\u547d\u4ee4\u53d8\u66f4\u8be5\u9009\u9879\uff1a<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"a-temp-temp","format":"standard","meta":{"_eb_attr":"","inline_featured_image":false,"_tocer_settings":[],"footnotes":""},"categories":[6],"tags":[],"class_list":["post-8777","post","type-post","status-publish","format-standard","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts\/8777","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/comments?post=8777"}],"version-history":[{"count":3,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts\/8777\/revisions"}],"predecessor-version":[{"id":8780,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts\/8777\/revisions\/8780"}],"wp:attachment":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/media?parent=8777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/categories?post=8777"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/tags?post=8777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}