{"id":74503,"date":"2024-10-15T22:30:18","date_gmt":"2024-10-15T14:30:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/74503\/"},"modified":"2024-10-15T22:30:18","modified_gmt":"2024-10-15T14:30:18","slug":"mysql-innodb%e5%bc%95%e6%93%8e%e4%b8%ad%e5%b0%8f%e5%bf%83count%e9%99%b7%e9%98%b1","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/74503\/","title":{"rendered":"MySQL InnoDB\u5f15\u64ce\u4e2d\u5c0f\u5fc3count(*)\u9677\u9631"},"content":{"rendered":"<h1 id=\"mysql-innodb%e5%bc%95%e6%93%8e%e4%b8%ad%e5%b0%8f%e5%bf%83count%e9%99%b7%e9%98%b1-MpmquTEuwC\">MySQL InnoDB\u5f15\u64ce\u4e2d\u5c0f\u5fc3count(*)\u9677\u9631<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u8cc7\u6599\u5eab\u6642\uff0c<code>count(*)<\/code>\u662f\u4e00\u500b\u5e38\u898b\u7684\u805a\u5408\u51fd\u6578\uff0c\u7528\u65bc\u8a08\u7b97\u8868\u4e2d\u884c\u7684\u6578\u91cf\u3002\u96d6\u7136\u9019\u500b\u51fd\u6578\u770b\u4f3c\u7c21\u55ae\uff0c\u4f46\u5728InnoDB\u5f15\u64ce\u4e2d\u4f7f\u7528\u6642\u537b\u53ef\u80fd\u6703\u9047\u5230\u4e00\u4e9b\u6027\u80fd\u554f\u984c\u548c\u9677\u9631\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u4e9b\u6f5b\u5728\u7684\u554f\u984c\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\uff0c\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u4f7f\u7528<code>count(*)<\/code>\u3002<\/p>\n<h2 id=\"innodb%e5%bc%95%e6%93%8e%e7%9a%84%e7%89%b9%e6%80%a7-MpmquTEuwC\">InnoDB\u5f15\u64ce\u7684\u7279\u6027<\/h2>\n<p>InnoDB\u662fMySQL\u7684\u9ed8\u8a8d\u5b58\u5132\u5f15\u64ce\uff0c\u5177\u6709\u4e8b\u52d9\u652f\u6301\u3001\u884c\u7d1a\u9396\u5b9a\u548c\u5916\u9375\u7d04\u675f\u7b49\u7279\u6027\u3002\u9019\u4e9b\u7279\u6027\u4f7f\u5f97InnoDB\u5728\u8655\u7406\u9ad8\u4f75\u767c\u7684\u61c9\u7528\u6642\u8868\u73fe\u51fa\u8272\u3002\u7136\u800c\uff0c\u9019\u4e9b\u7279\u6027\u4e5f\u4f7f\u5f97<code>count(*)<\/code>\u7684\u6027\u80fd\u53d7\u5230\u5f71\u97ff\u3002<\/p>\n<h2 id=\"count%e7%9a%84%e6%80%a7%e8%83%bd%e5%95%8f%e9%a1%8c-MpmquTEuwC\">count(*)\u7684\u6027\u80fd\u554f\u984c<\/h2>\n<p>\u5728InnoDB\u4e2d\uff0c<code>count(*)<\/code>\u7684\u57f7\u884c\u65b9\u5f0f\u8207\u5176\u4ed6\u5b58\u5132\u5f15\u64ce\u6709\u6240\u4e0d\u540c\u3002\u7576\u57f7\u884c<code>SELECT COUNT(*) FROM table_name;<\/code>\u6642\uff0cInnoDB\u9700\u8981\u6383\u63cf\u6574\u500b\u8868\u4f86\u8a08\u7b97\u884c\u6578\uff0c\u9019\u5728\u6578\u64da\u91cf\u8f03\u5927\u6642\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/p>\n<h3 id=\"%e8%a1%8c%e9%8e%96%e8%88%87%e6%ad%bb%e9%8e%96-MpmquTEuwC\">\u884c\u9396\u8207\u6b7b\u9396<\/h3>\n<p>\u7531\u65bcInnoDB\u4f7f\u7528\u884c\u7d1a\u9396\u5b9a\uff0c\u7576\u591a\u500b\u4e8b\u52d9\u540c\u6642\u57f7\u884c<code>count(*)<\/code>\u67e5\u8a62\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u9396\u7af6\u722d\uff0c\u9032\u800c\u5f15\u767c\u6b7b\u9396\u3002\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u6703\u53d7\u5230\u56b4\u91cd\u5f71\u97ff\uff0c\u751a\u81f3\u53ef\u80fd\u5c0e\u81f4\u61c9\u7528\u7a0b\u5e8f\u7684\u5d29\u6f70\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95%e7%9a%84%e5%bd%b1%e9%9f%bf-MpmquTEuwC\">\u4f7f\u7528\u7d22\u5f15\u7684\u5f71\u97ff<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c<code>count(*)<\/code>\u53ef\u4ee5\u5229\u7528\u7d22\u5f15\u4f86\u63d0\u9ad8\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5982\u679c\u8868\u4e2d\u6709\u4e00\u500b\u4e3b\u9375\u6216\u552f\u4e00\u7d22\u5f15\uff0c\u5247\u53ef\u4ee5\u4f7f\u7528<code>SELECT COUNT(primary_key) FROM table_name;<\/code>\u4f86\u8a08\u7b97\u884c\u6578\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u5168\u8868\u6383\u63cf\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-MpmquTEuwC\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li><strong>\u4f7f\u7528\u7d22\u5f15\uff1a<\/strong>\u5982\u524d\u6240\u8ff0\uff0c\u5229\u7528\u7d22\u5f15\u4f86\u8a08\u7b97\u884c\u6578\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li><strong>\u8003\u616e\u4f7f\u7528<code>count(1)<\/code>\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528<code>count(1)<\/code>\u53ef\u80fd\u6703\u6bd4<code>count(*)<\/code>\u66f4\u5feb\uff0c\u56e0\u70ba\u5b83\u4e0d\u9700\u8981\u6aa2\u67e5\u6bcf\u4e00\u884c\u7684\u6240\u6709\u5217\u3002<\/li>\n<li><strong>\u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab\uff1a<\/strong>\u5b9a\u671f\u57f7\u884c<code>OPTIMIZE TABLE<\/code>\u53ef\u4ee5\u5e6b\u52a9\u6e1b\u5c11\u788e\u7247\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li><strong>\u4f7f\u7528\u5feb\u7167\u6216\u7de9\u5b58\uff1a<\/strong>\u5c0d\u65bc\u983b\u7e41\u67e5\u8a62\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u5feb\u7167\u6216\u7de9\u5b58\u6280\u8853\u4f86\u6e1b\u5c11\u5c0d\u6578\u64da\u5eab\u7684\u76f4\u63a5\u67e5\u8a62\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-MpmquTEuwC\">\u7d50\u8ad6<\/h2>\n<p>\u5728\u4f7f\u7528MySQL InnoDB\u5f15\u64ce\u6642\uff0c<code>count(*)<\/code>\u96d6\u7136\u662f\u4e00\u500b\u7c21\u55ae\u7684\u67e5\u8a62\uff0c\u4f46\u5176\u80cc\u5f8c\u537b\u96b1\u85cf\u8457\u8a31\u591a\u6027\u80fd\u9677\u9631\u3002\u4e86\u89e3\u9019\u4e9b\u554f\u984c\u4e26\u63a1\u53d6\u76f8\u61c9\u7684\u6700\u4f73\u5be6\u8e10\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u5728\u8655\u7406\u5927\u6578\u64da\u91cf\u6642\u63d0\u9ad8\u61c9\u7528\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684<code>VPS<\/code>\u89e3\u6c7a\u65b9\u6848\uff0c\u7121\u8ad6\u662f\u7528\u65bc\u6578\u64da\u5eab\u9084\u662f\u5176\u4ed6\u61c9\u7528\uff0c\u8acb\u8003\u616e\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\u3002\u6211\u5011\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u9748\u6d3b\u7684\u914d\u7f6e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL InnoDB\u5f15\u64ce\u4e2dcount(*)\u7684\u9677\u9631\uff0c\u907f\u514d\u6027\u80fd\u95ee\u9898\uff0c\u4f18\u5316\u67e5\u8be2\u6548\u7387\uff0c\u63d0\u5347\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u51c6\u786e\u6027\u4e0e\u901f\u5ea6\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-74503","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74503","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=74503"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74503\/revisions"}],"predecessor-version":[{"id":74504,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/74503\/revisions\/74504"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=74503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=74503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=74503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}