{"id":181284,"date":"2024-11-09T15:46:25","date_gmt":"2024-11-09T07:46:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/181284\/"},"modified":"2024-11-09T15:46:26","modified_gmt":"2024-11-09T07:46:26","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%ab%e4%ba%8b%e5%8b%99%e9%8e%96%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e4%ba%8b%e5%8b%99%e9%8e%96%e6%98%af%e4%bb%80%e9%ba%bc%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/181284\/","title":{"rendered":"\u6df1\u5165\u7406\u89e3\u6578\u64da\u5eab\u4e8b\u52d9\u9396\uff08\u6578\u64da\u5eab\u4e8b\u52d9\u9396\u662f\u4ec0\u9ebc\uff09"},"content":{"rendered":"<h1 id=\"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3%e6%95%b8%e6%93%9a%e5%ba%ab%e4%ba%8b%e5%8b%99%e9%8e%96%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e4%ba%8b%e5%8b%99%e9%8e%96%e6%98%af%e4%bb%80%e9%ba%bc%ef%bc%89-nQrRSKXrrM\">\u6df1\u5165\u7406\u89e3\u6578\u64da\u5eab\u4e8b\u52d9\u9396\uff08\u6578\u64da\u5eab\u4e8b\u52d9\u9396\u662f\u4ec0\u9ebc\uff09<\/h1>\n<p>\u5728\u73fe\u4ee3\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\uff0c\u6578\u64da\u5eab\u4e8b\u52d9\u9396\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6982\u5ff5\u3002\u5b83\u5011\u7528\u65bc\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\uff0c\u7279\u5225\u662f\u5728\u591a\u7528\u6236\u74b0\u5883\u4e2d\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eab\u4e8b\u52d9\u9396\u7684\u57fa\u672c\u6982\u5ff5\u3001\u985e\u578b\u53ca\u5176\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e4%ba%8b%e5%8b%99%e9%8e%96%ef%bc%9f-nQrRSKXrrM\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u4e8b\u52d9\u9396\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u4e8b\u52d9\u9396\u662f\u7528\u65bc\u63a7\u5236\u5c0d\u6578\u64da\u5eab\u8cc7\u6e90\u7684\u8a2a\u554f\u7684\u4e00\u7a2e\u6a5f\u5236\u3002\u7576\u591a\u500b\u7528\u6236\u6216\u61c9\u7528\u7a0b\u5e8f\u540c\u6642\u8a66\u5716\u8a2a\u554f\u6216\u4fee\u6539\u540c\u4e00\u6578\u64da\u6642\uff0c\u9396\u53ef\u4ee5\u9632\u6b62\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u767c\u751f\u3002\u9396\u7684\u4e3b\u8981\u76ee\u7684\u662f\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\uff0c\u907f\u514d\u51fa\u73fe\u7af6\u722d\u689d\u4ef6\uff08race condition\uff09\u548c\u6b7b\u9396\uff08deadlock\uff09\u7b49\u554f\u984c\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e4%ba%8b%e5%8b%99%e9%8e%96%e7%9a%84%e9%a1%9e%e5%9e%8b-nQrRSKXrrM\">\u6578\u64da\u5eab\u4e8b\u52d9\u9396\u7684\u985e\u578b<\/h2>\n<p>\u6578\u64da\u5eab\u4e8b\u52d9\u9396\u4e3b\u8981\u5206\u70ba\u4ee5\u4e0b\u5e7e\u7a2e\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u5171\u4eab\u9396\uff08Shared Lock\uff09<\/strong>: \u5141\u8a31\u591a\u500b\u4e8b\u52d9\u540c\u6642\u8b80\u53d6\u6578\u64da\uff0c\u4f46\u4e0d\u5141\u8a31\u4fee\u6539\u3002\u7576\u4e00\u500b\u4e8b\u52d9\u6301\u6709\u5171\u4eab\u9396\u6642\uff0c\u5176\u4ed6\u4e8b\u52d9\u4e5f\u53ef\u4ee5\u7372\u5f97\u5171\u4eab\u9396\uff0c\u4f46\u4e0d\u80fd\u7372\u5f97\u6392\u4ed6\u9396\u3002<\/li>\n<li><strong>\u6392\u4ed6\u9396\uff08Exclusive Lock\uff09<\/strong>: \u5141\u8a31\u4e00\u500b\u4e8b\u52d9\u5c0d\u6578\u64da\u9032\u884c\u8b80\u53d6\u548c\u4fee\u6539\u3002\u7576\u4e00\u500b\u4e8b\u52d9\u6301\u6709\u6392\u4ed6\u9396\u6642\uff0c\u5176\u4ed6\u4e8b\u52d9\u7121\u6cd5\u7372\u5f97\u4efb\u4f55\u985e\u578b\u7684\u9396\u3002<\/li>\n<li><strong>\u610f\u5411\u9396\uff08Intent Lock\uff09<\/strong>: \u7528\u65bc\u8868\u660e\u4e00\u500b\u4e8b\u52d9\u6253\u7b97\u5728\u66f4\u4f4e\u5c64\u7d1a\u7684\u7c92\u5ea6\u4e0a\u7372\u5f97\u9396\u3002\u610f\u5411\u9396\u5206\u70ba\u610f\u5411\u5171\u4eab\u9396\uff08IS\uff09\u548c\u610f\u5411\u6392\u4ed6\u9396\uff08IX\uff09\uff0c\u7528\u65bc\u5354\u8abf\u4e0d\u540c\u5c64\u7d1a\u7684\u9396\u3002<\/li>\n<li><strong>\u81ea\u52d5\u9396\uff08Automatic Lock\uff09<\/strong>: \u6578\u64da\u5eab\u7cfb\u7d71\u5728\u57f7\u884c\u4e8b\u52d9\u6642\u81ea\u52d5\u7ba1\u7406\u7684\u9396\uff0c\u901a\u5e38\u4e0d\u9700\u8981\u7528\u6236\u624b\u52d5\u5e72\u9810\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%8e%96%e7%9a%84%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86-nQrRSKXrrM\">\u9396\u7684\u5de5\u4f5c\u539f\u7406<\/h2>\n<p>\u7576\u4e00\u500b\u4e8b\u52d9\u9700\u8981\u8a2a\u554f\u6578\u64da\u6642\uff0c\u5b83\u9996\u5148\u6703\u8acb\u6c42\u76f8\u61c9\u7684\u9396\u3002\u5982\u679c\u9396\u53ef\u7528\uff0c\u5247\u4e8b\u52d9\u5c07\u7372\u5f97\u9396\u4e26\u53ef\u4ee5\u9032\u884c\u64cd\u4f5c\uff1b\u5982\u679c\u9396\u4e0d\u53ef\u7528\uff0c\u5247\u4e8b\u52d9\u5c07\u88ab\u963b\u585e\uff0c\u76f4\u5230\u9396\u88ab\u91cb\u653e\u3002\u9019\u7a2e\u6a5f\u5236\u78ba\u4fdd\u4e86\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002<\/p>\n<pre><code>\n-- \u7372\u53d6\u5171\u4eab\u9396\u7684 SQL \u793a\u4f8b\nBEGIN TRANSACTION;\nSELECT * FROM users WITH (NOLOCK);\nCOMMIT;\n\n-- \u7372\u53d6\u6392\u4ed6\u9396\u7684 SQL \u793a\u4f8b\nBEGIN TRANSACTION;\nUPDATE users SET name = 'John' WHERE id = 1;\nCOMMIT;\n<\/code><\/pre>\n<h2 id=\"%e9%8e%96%e7%9a%84%e5%bd%b1%e9%9f%bf-nQrRSKXrrM\">\u9396\u7684\u5f71\u97ff<\/h2>\n<p>\u96d6\u7136\u9396\u5728\u4fdd\u8b77\u6578\u64da\u5b8c\u6574\u6027\u65b9\u9762\u81f3\u95dc\u91cd\u8981\uff0c\u4f46\u5b83\u5011\u4e5f\u53ef\u80fd\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u3002\u4f8b\u5982\uff0c\u904e\u591a\u7684\u9396\u53ef\u80fd\u6703\u5c0e\u81f4\u4e8b\u52d9\u7684\u5ef6\u9072\uff0c\u751a\u81f3\u6b7b\u9396\u60c5\u6cc1\u7684\u767c\u751f\u3002\u70ba\u4e86\u6e1b\u5c11\u9019\u4e9b\u554f\u984c\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u901a\u5e38\u6703\u5be6\u65bd\u4e00\u4e9b\u7b56\u7565\uff0c\u5982\u9396\u8d85\u6642\u548c\u6b7b\u9396\u6aa2\u6e2c\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-nQrRSKXrrM\">\u7d50\u8ad6<\/h2>\n<p>\u6578\u64da\u5eab\u4e8b\u52d9\u9396\u662f\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u7684\u95dc\u9375\u6a5f\u5236\u3002\u7406\u89e3\u4e0d\u540c\u985e\u578b\u7684\u9396\u53ca\u5176\u5de5\u4f5c\u539f\u7406\uff0c\u5c0d\u65bc\u8a2d\u8a08\u9ad8\u6548\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u81f3\u95dc\u91cd\u8981\u3002\u5728\u591a\u7528\u6236\u74b0\u5883\u4e2d\uff0c\u5408\u7406\u4f7f\u7528\u9396\u53ef\u4ee5\u6709\u6548\u907f\u514d\u6578\u64da\u885d\u7a81\u548c\u4e0d\u4e00\u81f4\u7684\u554f\u984c\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u6280\u8853\u554f\u984c\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\u3002\u6211\u5011\u63d0\u4f9b\u5404\u7a2e <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u60a8\u7684\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5e8f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u7406\u89e3\u6578\u64da\u5eab\u4e8b\u52d9\u9396\u7684\u6982\u5ff5\u3001\u985e\u578b\u53ca\u5176\u5728\u6578\u64da\u4e00\u81f4\u6027\u548c\u4e26\u767c\u63a7\u5236\u4e2d\u7684\u91cd\u8981\u6027\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\u5b89\u5168\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-181284","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/181284","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=181284"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/181284\/revisions"}],"predecessor-version":[{"id":181285,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/181284\/revisions\/181285"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=181284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=181284"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=181284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}