{"id":175085,"date":"2024-11-08T02:34:21","date_gmt":"2024-11-07T18:34:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/175085\/"},"modified":"2024-11-08T02:34:22","modified_gmt":"2024-11-07T18:34:22","slug":"%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%bemysql%e9%8e%96%e7%9a%84%e5%84%aa%e5%8c%96","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/175085\/","title":{"rendered":"\u5982\u4f55\u5be6\u73feMySQL\u9396\u7684\u512a\u5316"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%bemysql%e9%8e%96%e7%9a%84%e5%84%aa%e5%8c%96-AsMYdnsJED\">\u5982\u4f55\u5be6\u73feMySQL\u9396\u7684\u512a\u5316<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u9396\u7684\u4f7f\u7528\u662f\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u7684\u91cd\u8981\u624b\u6bb5\u3002\u7136\u800c\uff0c\u904e\u5ea6\u6216\u4e0d\u7576\u7684\u9396\u5b9a\u6703\u5c0e\u81f4\u6027\u80fd\u74f6\u9838\uff0c\u5f71\u97ff\u61c9\u7528\u7a0b\u5e8f\u7684\u97ff\u61c9\u901f\u5ea6\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u512a\u5316MySQL\u4e2d\u7684\u9396\uff0c\u4ee5\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u6548\u7387\u3002<\/p>\n<h2 id=\"1-%e7%90%86%e8%a7%a3mysql%e9%8e%96%e7%9a%84%e9%a1%9e%e5%9e%8b-AsMYdnsJED\">1. \u7406\u89e3MySQL\u9396\u7684\u985e\u578b<\/h2>\n<p>\u5728\u512a\u5316\u9396\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u4e86\u89e3MySQL\u4e2d\u4e0d\u540c\u985e\u578b\u7684\u9396\u3002\u4e3b\u8981\u6709\u4ee5\u4e0b\u5e7e\u7a2e\uff1a<\/p>\n<ul>\n<li><strong>\u884c\u9396\uff08Row Lock\uff09<\/strong>\uff1a\u53ea\u9396\u5b9a\u7279\u5b9a\u7684\u884c\uff0c\u5141\u8a31\u5176\u4ed6\u884c\u7684\u64cd\u4f5c\uff0c\u9069\u5408\u9ad8\u4f75\u767c\u7684\u5834\u666f\u3002<\/li>\n<li><strong>\u8868\u9396\uff08Table Lock\uff09<\/strong>\uff1a\u9396\u5b9a\u6574\u500b\u8868\uff0c\u9069\u5408\u8b80\u53d6\u64cd\u4f5c\u8f03\u591a\u7684\u5834\u666f\uff0c\u4f46\u6703\u5f71\u97ff\u5176\u4ed6\u64cd\u4f5c\u7684\u4e26\u767c\u6027\u3002<\/li>\n<li><strong>\u610f\u5411\u9396\uff08Intention Lock\uff09<\/strong>\uff1a\u7528\u65bc\u8868\u660e\u67d0\u500b\u4e8b\u52d9\u5c07\u8981\u5c0d\u67d0\u884c\u52a0\u9396\uff0c\u4e3b\u8981\u7528\u65bc\u884c\u9396\u548c\u8868\u9396\u7684\u7d50\u5408\u3002<\/li>\n<\/ul>\n<h2 id=\"2-%e9%8e%96%e7%9a%84%e5%84%aa%e5%8c%96%e7%ad%96%e7%95%a5-AsMYdnsJED\">2. \u9396\u7684\u512a\u5316\u7b56\u7565<\/h2>\n<h3 id=\"2-1-%e6%b8%9b%e5%b0%91%e9%8e%96%e7%9a%84%e7%af%84%e5%9c%8d-AsMYdnsJED\">2.1 \u6e1b\u5c11\u9396\u7684\u7bc4\u570d<\/h3>\n<p>\u5728\u9032\u884c\u6578\u64da\u64cd\u4f5c\u6642\uff0c\u61c9\u76e1\u91cf\u6e1b\u5c11\u9396\u7684\u7bc4\u570d\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u884c\u9396\u800c\u975e\u8868\u9396\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u4e26\u767c\u6027\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>START TRANSACTION;\nSELECT * FROM users WHERE id = 1 FOR UPDATE;\n-- \u9032\u884c\u6578\u64da\u66f4\u65b0\nUPDATE users SET name = '\u65b0\u540d\u5b57' WHERE id = 1;\nCOMMIT;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u4f7f\u7528\u4e86\u884c\u9396\u4f86\u9396\u5b9a\u7279\u5b9a\u7684\u7528\u6236\u884c\uff0c\u9019\u6a23\u5176\u4ed6\u7528\u6236\u7684\u884c\u4ecd\u7136\u53ef\u4ee5\u88ab\u8a2a\u554f\u3002<\/p>\n<h3 id=\"2-2-%e4%bd%bf%e7%94%a8%e5%90%88%e9%81%a9%e7%9a%84%e9%9a%94%e9%9b%a2%e7%b4%9a%e5%88%a5-AsMYdnsJED\">2.2 \u4f7f\u7528\u5408\u9069\u7684\u9694\u96e2\u7d1a\u5225<\/h3>\n<p>MySQL\u652f\u6301\u591a\u7a2e\u4e8b\u52d9\u9694\u96e2\u7d1a\u5225\uff0c\u5305\u62ec\u8b80\u672a\u63d0\u4ea4\u3001\u8b80\u5df2\u63d0\u4ea4\u3001\u53ef\u91cd\u8907\u8b80\u548c\u4e32\u884c\u5316\u3002\u9078\u64c7\u5408\u9069\u7684\u9694\u96e2\u7d1a\u5225\u53ef\u4ee5\u6709\u6548\u6e1b\u5c11\u9396\u7684\u7af6\u722d\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u8b80\u5df2\u63d0\u4ea4\u9694\u96e2\u7d1a\u5225\u53ef\u4ee5\u6e1b\u5c11\u4e0d\u5fc5\u8981\u7684\u9396\u5b9a\uff1a<\/p>\n<pre><code>SET TRANSACTION ISOLATION LEVEL READ COMMITTED;<\/code><\/pre>\n<h3 id=\"2-3-%e9%81%bf%e5%85%8d%e9%95%b7%e6%99%82%e9%96%93%e6%8c%81%e6%9c%89%e9%8e%96-AsMYdnsJED\">2.3 \u907f\u514d\u9577\u6642\u9593\u6301\u6709\u9396<\/h3>\n<p>\u9577\u6642\u9593\u6301\u6709\u9396\u6703\u5c0e\u81f4\u5176\u4ed6\u4e8b\u52d9\u7121\u6cd5\u57f7\u884c\uff0c\u5f9e\u800c\u5f71\u97ff\u6027\u80fd\u3002\u61c9\u8a72\u76e1\u91cf\u7e2e\u77ed\u4e8b\u52d9\u7684\u57f7\u884c\u6642\u9593\uff0c\u4e26\u5728\u4e8b\u52d9\u5b8c\u6210\u5f8c\u7acb\u5373\u91cb\u653e\u9396\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>START TRANSACTION;\n-- \u9032\u884c\u5fc5\u8981\u7684\u64cd\u4f5c\nUPDATE orders SET status = '\u5df2\u767c\u8ca8' WHERE order_id = 123;\nCOMMIT;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u4e8b\u52d9\u7684\u7bc4\u570d\u88ab\u63a7\u5236\u5728\u6700\u5c0f\uff0c\u5f9e\u800c\u6e1b\u5c11\u4e86\u9396\u7684\u6301\u6709\u6642\u9593\u3002<\/p>\n<h3 id=\"2-4-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95%e4%be%86%e6%b8%9b%e5%b0%91%e9%8e%96%e7%ab%b6%e7%88%ad-AsMYdnsJED\">2.4 \u4f7f\u7528\u7d22\u5f15\u4f86\u6e1b\u5c11\u9396\u7af6\u722d<\/h3>\n<p>\u9069\u7576\u7684\u7d22\u5f15\u53ef\u4ee5\u52a0\u901f\u67e5\u8a62\uff0c\u5f9e\u800c\u6e1b\u5c11\u9396\u7684\u7af6\u722d\u3002\u78ba\u4fdd\u5728\u7d93\u5e38\u67e5\u8a62\u7684\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u6e1b\u5c11\u9396\u7684\u6301\u6709\u6642\u9593\u3002<\/p>\n<pre><code>CREATE INDEX idx_user_id ON users (id);<\/code><\/pre>\n<h2 id=\"3-%e7%9b%a3%e6%8e%a7%e5%92%8c%e8%aa%bf%e8%a9%a6%e9%8e%96-AsMYdnsJED\">3. \u76e3\u63a7\u548c\u8abf\u8a66\u9396<\/h2>\n<p>\u4f7f\u7528MySQL\u7684\u6027\u80fd\u76e3\u63a7\u5de5\u5177\uff0c\u5982SHOW PROCESSLIST\u548cINFORMATION_SCHEMA.INNODB_LOCKS\uff0c\u53ef\u4ee5\u5e6b\u52a9\u8b58\u5225\u9396\u7684\u554f\u984c\u3002\u901a\u904e\u9019\u4e9b\u5de5\u5177\uff0c\u53ef\u4ee5\u67e5\u770b\u7576\u524d\u7684\u9396\u5b9a\u60c5\u6cc1\uff0c\u4e26\u627e\u51fa\u53ef\u80fd\u7684\u6027\u80fd\u74f6\u9838\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-AsMYdnsJED\">\u7e3d\u7d50<\/h2>\n<p>\u512a\u5316MySQL\u9396\u7684\u4f7f\u7528\u662f\u63d0\u9ad8\u6578\u64da\u5eab\u6027\u80fd\u7684\u95dc\u9375\u3002\u901a\u904e\u6e1b\u5c11\u9396\u7684\u7bc4\u570d\u3001\u9078\u64c7\u5408\u9069\u7684\u9694\u96e2\u7d1a\u5225\u3001\u907f\u514d\u9577\u6642\u9593\u6301\u6709\u9396\u4ee5\u53ca\u4f7f\u7528\u7d22\u5f15\u4f86\u6e1b\u5c11\u9396\u7af6\u722d\uff0c\u53ef\u4ee5\u6709\u6548\u63d0\u5347\u6578\u64da\u5eab\u7684\u97ff\u61c9\u901f\u5ea6\u548c\u4e26\u767c\u8655\u7406\u80fd\u529b\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u5728\u7a69\u5b9a\u7684\u74b0\u5883\u4e2d\u904b\u884c\uff0c\u9032\u4e00\u6b65\u63d0\u5347\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5982\u4f55\u512a\u5316MySQL\u9396\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\uff0c\u6e1b\u5c11\u9396\u7af6\u722d\uff0c\u78ba\u4fdd\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u548c\u7cfb\u7d71\u7a69\u5b9a\u6027\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-175085","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175085","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=175085"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175085\/revisions"}],"predecessor-version":[{"id":175086,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175085\/revisions\/175086"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=175085"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=175085"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=175085"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}