{"id":74431,"date":"2024-10-15T22:25:45","date_gmt":"2024-10-15T14:25:45","guid":{"rendered":"https:\/\/server.hk\/cnblog\/74431\/"},"modified":"2024-10-15T22:25:45","modified_gmt":"2024-10-15T14:25:45","slug":"mysql-force-index-%e5%bc%b7%e5%88%b6%e7%b4%a2%e5%bc%95%e6%a6%82%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/74431\/","title":{"rendered":"MySQL force Index \u5f37\u5236\u7d22\u5f15\u6982\u8ff0"},"content":{"rendered":"<h1 id=\"mysql-force-index-%e5%bc%b7%e5%88%b6%e7%b4%a2%e5%bc%95%e6%a6%82%e8%bf%b0-BDidcovuFz\">MySQL Force Index \u5f37\u5236\u7d22\u5f15\u6982\u8ff0<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u7a2e\u7528\u65bc\u52a0\u901f\u67e5\u8a62\u7684\u8cc7\u6599\u7d50\u69cb\u3002MySQL \u63d0\u4f9b\u4e86\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u4e26\u4e14\u5141\u8a31\u7528\u6236\u5728\u67e5\u8a62\u4e2d\u5f37\u5236\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\u3002\u9019\u7a2e\u6280\u8853\u7a31\u70ba\u300c\u5f37\u5236\u7d22\u5f15\u300d\uff08Force Index\uff09\uff0c\u5b83\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u512a\u5316\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%bc%b7%e5%88%b6%e7%b4%a2%e5%bc%95%ef%bc%9f-BDidcovuFz\">\u4ec0\u9ebc\u662f\u5f37\u5236\u7d22\u5f15\uff1f<\/h2>\n<p>\u5f37\u5236\u7d22\u5f15\u662f MySQL \u4e2d\u7684\u4e00\u7a2e\u67e5\u8a62\u63d0\u793a\uff0c\u5141\u8a31\u7528\u6236\u6307\u5b9a\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u7279\u5b9a\u7684\u7d22\u5f15\u3002\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u975e\u5e38\u6709\u7528\uff0c\u7279\u5225\u662f\u7576 MySQL \u7684\u67e5\u8a62\u512a\u5316\u5668\u672a\u80fd\u9078\u64c7\u6700\u4f73\u7d22\u5f15\u6642\u3002\u4f7f\u7528\u5f37\u5236\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\uff0c\u6e1b\u5c11\u57f7\u884c\u6642\u9593\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%bc%b7%e5%88%b6%e7%b4%a2%e5%bc%95%e7%9a%84%e6%83%85%e5%a2%83-BDidcovuFz\">\u4f7f\u7528\u5f37\u5236\u7d22\u5f15\u7684\u60c5\u5883<\/h2>\n<p>\u5728\u4ee5\u4e0b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u5f37\u5236\u7d22\u5f15\u53ef\u80fd\u6703\u6709\u6240\u5e6b\u52a9\uff1a<\/p>\n<ul>\n<li><strong>\u67e5\u8a62\u512a\u5316\u5668\u9078\u64c7\u4e0d\u7576\uff1a<\/strong>\u6709\u6642\u5019\uff0cMySQL \u7684\u67e5\u8a62\u512a\u5316\u5668\u53ef\u80fd\u6703\u9078\u64c7\u4e00\u500b\u4e0d\u7406\u60f3\u7684\u7d22\u5f15\uff0c\u5c0e\u81f4\u67e5\u8a62\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<li><strong>\u8907\u96dc\u67e5\u8a62\uff1a<\/strong>\u5728\u6d89\u53ca\u591a\u500b\u8868\u548c\u806f\u63a5\u7684\u8907\u96dc\u67e5\u8a62\u4e2d\uff0c\u5f37\u5236\u4f7f\u7528\u7279\u5b9a\u7d22\u5f15\u53ef\u4ee5\u5e6b\u52a9\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li><strong>\u7279\u5b9a\u67e5\u8a62\u6a21\u5f0f\uff1a<\/strong>\u5982\u679c\u67d0\u4e9b\u67e5\u8a62\u6a21\u5f0f\u7d93\u5e38\u51fa\u73fe\uff0c\u4e26\u4e14\u4f7f\u7528\u7279\u5b9a\u7d22\u5f15\u80fd\u986f\u8457\u63d0\u9ad8\u6027\u80fd\uff0c\u5247\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u5f37\u5236\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8%e5%bc%b7%e5%88%b6%e7%b4%a2%e5%bc%95-BDidcovuFz\">\u5982\u4f55\u4f7f\u7528\u5f37\u5236\u7d22\u5f15<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u4f7f\u7528\u5f37\u5236\u7d22\u5f15\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT * FROM table_name USE INDEX (index_name) WHERE condition;<\/code><\/pre>\n<p>\u9019\u88e1\u7684 <code>USE INDEX<\/code> \u63d0\u793a\u544a\u8a34 MySQL \u4f7f\u7528\u6307\u5b9a\u7684\u7d22\u5f15\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u5177\u9ad4\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre><code>SELECT * FROM employees USE INDEX (idx_last_name) WHERE last_name = 'Smith';<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u67e5\u8a62\u5c07\u5f37\u5236\u4f7f\u7528\u540d\u70ba <code>idx_last_name<\/code> \u7684\u7d22\u5f15\u4f86\u67e5\u627e\u59d3\u6c0f\u70ba\u300cSmith\u300d\u7684\u54e1\u5de5\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-BDidcovuFz\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u5f37\u5236\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u5728\u4f7f\u7528\u6642\u9700\u8981\u8b39\u614e\uff1a<\/p>\n<ul>\n<li><strong>\u53ef\u80fd\u5f71\u97ff\u6027\u80fd\uff1a<\/strong>\u5f37\u5236\u4f7f\u7528\u67d0\u500b\u7d22\u5f15\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u7279\u5225\u662f\u5728\u8cc7\u6599\u91cf\u8b8a\u5316\u6642\u3002<\/li>\n<li><strong>\u7dad\u8b77\u6210\u672c\uff1a<\/strong>\u5982\u679c\u8cc7\u6599\u5eab\u7d50\u69cb\u6216\u7d22\u5f15\u7b56\u7565\u767c\u751f\u8b8a\u5316\uff0c\u5f37\u5236\u7d22\u5f15\u53ef\u80fd\u9700\u8981\u91cd\u65b0\u8a55\u4f30\u548c\u8abf\u6574\u3002<\/li>\n<li><strong>\u4e0d\u9069\u7528\u65bc\u6240\u6709\u67e5\u8a62\uff1a<\/strong>\u4e26\u975e\u6240\u6709\u67e5\u8a62\u90fd\u9069\u5408\u4f7f\u7528\u5f37\u5236\u7d22\u5f15\uff0c\u958b\u767c\u8005\u9700\u8981\u6839\u64da\u5177\u9ad4\u60c5\u6cc1\u9032\u884c\u5224\u65b7\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-BDidcovuFz\">\u7d50\u8ad6<\/h2>\n<p>\u5f37\u5236\u7d22\u5f15\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728 MySQL \u4e2d\u512a\u5316\u67e5\u8a62\u6027\u80fd\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u5f37\u5236\u7d22\u5f15\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728\u7279\u5b9a\u60c5\u6cc1\u4e0b\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u7136\u800c\uff0c\u4f7f\u7528\u6642\u9700\u8b39\u614e\uff0c\u4e26\u6839\u64da\u5be6\u969b\u60c5\u6cc1\u9032\u884c\u8abf\u6574\u3002\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u4f7f\u7528\u5f37\u5236\u7d22\u5f15\uff0c\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u8cc7\u6599\u5eab\u7684\u6574\u9ad4\u6027\u80fd\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3 MySQL \u548c\u5176\u4ed6\u8cc7\u6599\u5eab\u6280\u8853\uff0c\u60a8\u53ef\u4ee5\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\uff0c\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u9084\u662f\u5176\u4ed6 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u63d0\u4f9b\u5c08\u696d\u7684\u652f\u6301\u548c\u5efa\u8b70\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684\u5f37\u5236\u7d22\u5f15\uff08FORCE INDEX\uff09\u7528\u6cd5\uff0c\u63d0\u5347\u67e5\u8a62\u6027\u80fd\uff0c\u512a\u5316\u6578\u64da\u6aa2\u7d22\u6548\u7387\uff0c\u78ba\u4fdd\u6700\u4f73\u57f7\u884c\u8a08\u5283\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-74431","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74431","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=74431"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74431\/revisions"}],"predecessor-version":[{"id":74432,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74431\/revisions\/74432"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=74431"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=74431"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=74431"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}