{"id":173229,"date":"2024-11-07T16:15:24","date_gmt":"2024-11-07T08:15:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/173229\/"},"modified":"2024-11-07T16:15:25","modified_gmt":"2024-11-07T08:15:25","slug":"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e6%95%b8%e6%93%9a%e5%ba%ab%e9%8e%96%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e9%8e%96%e7%9a%84%e5%89%b5%e5%bb%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/173229\/","title":{"rendered":"\u5982\u4f55\u5275\u5efa\u6578\u64da\u5eab\u9396\uff1f (\u6578\u64da\u5eab\u9396\u7684\u5275\u5efa)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e6%95%b8%e6%93%9a%e5%ba%ab%e9%8e%96%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab%e9%8e%96%e7%9a%84%e5%89%b5%e5%bb%ba-VbDUfwIjBv\">\u5982\u4f55\u5275\u5efa\u6578\u64da\u5eab\u9396\uff1f (\u6578\u64da\u5eab\u9396\u7684\u5275\u5efa)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u5eab\u9396\u662f\u4e00\u500b\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u7279\u5225\u662f\u5728\u591a\u7528\u6236\u74b0\u5883\u4e2d\u3002\u6578\u64da\u5eab\u9396\u7684\u4e3b\u8981\u76ee\u7684\u662f\u9632\u6b62\u6578\u64da\u7684\u7af6\u722d\u689d\u4ef6\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u6578\u64da\u5eab\u9396\u7684\u57fa\u672c\u6982\u5ff5\u3001\u985e\u578b\u4ee5\u53ca\u5982\u4f55\u5728\u4e0d\u540c\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u5275\u5efa\u548c\u7ba1\u7406\u9396\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e9%8e%96%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-VbDUfwIjBv\">\u6578\u64da\u5eab\u9396\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u6578\u64da\u5eab\u9396\u662f\u7528\u4f86\u63a7\u5236\u5c0d\u6578\u64da\u5eab\u8cc7\u6e90\u7684\u8a2a\u554f\u7684\u4e00\u7a2e\u6a5f\u5236\u3002\u7576\u591a\u500b\u7528\u6236\u540c\u6642\u8a2a\u554f\u6216\u4fee\u6539\u540c\u4e00\u6578\u64da\u6642\uff0c\u9396\u53ef\u4ee5\u9632\u6b62\u6578\u64da\u7684\u4e0d\u4e00\u81f4\u6027\u3002\u9396\u7684\u4f7f\u7528\u53ef\u4ee5\u78ba\u4fdd\u5728\u4e00\u500b\u4e8b\u52d9\u5b8c\u6210\u4e4b\u524d\uff0c\u5176\u4ed6\u4e8b\u52d9\u7121\u6cd5\u8a2a\u554f\u88ab\u9396\u5b9a\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e9%8e%96%e7%9a%84%e9%a1%9e%e5%9e%8b-VbDUfwIjBv\">\u6578\u64da\u5eab\u9396\u7684\u985e\u578b<\/h2>\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>: \u53ea\u5141\u8a31\u4e00\u500b\u4e8b\u52d9\u8a2a\u554f\u6578\u64da\uff0c\u7121\u8ad6\u662f\u8b80\u53d6\u9084\u662f\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\u67d0\u500b\u5c64\u7d1a\u4e0a\u7372\u5f97\u9396\u3002\u9019\u7a2e\u9396\u901a\u5e38\u7528\u65bc\u591a\u5c64\u6b21\u7684\u9396\u5b9a\u7b56\u7565\u4e2d\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e6%95%b8%e6%93%9a%e5%ba%ab%e9%8e%96-VbDUfwIjBv\">\u5982\u4f55\u5275\u5efa\u6578\u64da\u5eab\u9396<\/h2>\n<p>\u5275\u5efa\u6578\u64da\u5eab\u9396\u7684\u5177\u9ad4\u65b9\u6cd5\u53d6\u6c7a\u65bc\u6240\u4f7f\u7528\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u5275\u5efa\u9396\u7684\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"%e5%9c%a8-mysql-%e4%b8%ad%e5%89%b5%e5%bb%ba%e9%8e%96-VbDUfwIjBv\">\u5728 MySQL \u4e2d\u5275\u5efa\u9396<\/h3>\n<p>\u5728 MySQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>LOCK TABLES<\/code> \u8a9e\u53e5\u4f86\u5275\u5efa\u9396\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>LOCK TABLES my_table WRITE;<\/code><\/pre>\n<p>\u9019\u5c07\u5c0d <code>my_table<\/code> \u8868\u65bd\u52a0\u6392\u4ed6\u9396\uff0c\u5176\u4ed6\u4e8b\u52d9\u5c07\u7121\u6cd5\u8a2a\u554f\u8a72\u8868\u3002\u5b8c\u6210\u64cd\u4f5c\u5f8c\uff0c\u61c9\u4f7f\u7528 <code>UNLOCK TABLES<\/code> \u91cb\u653e\u9396\uff1a<\/p>\n<pre><code>UNLOCK TABLES;<\/code><\/pre>\n<h3 id=\"%e5%9c%a8-postgresql-%e4%b8%ad%e5%89%b5%e5%bb%ba%e9%8e%96-VbDUfwIjBv\">\u5728 PostgreSQL \u4e2d\u5275\u5efa\u9396<\/h3>\n<p>\u5728 PostgreSQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>SELECT FOR UPDATE<\/code> \u4f86\u5275\u5efa\u6392\u4ed6\u9396\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>BEGIN;\nSELECT * FROM my_table WHERE id = 1 FOR UPDATE;<\/code><\/pre>\n<p>\u9019\u5c07\u9396\u5b9a\u67e5\u8a62\u7d50\u679c\u4e2d\u7684\u884c\uff0c\u76f4\u5230\u4e8b\u52d9\u7d50\u675f\u3002<\/p>\n<h3 id=\"%e5%9c%a8-sql-server-%e4%b8%ad%e5%89%b5%e5%bb%ba%e9%8e%96-VbDUfwIjBv\">\u5728 SQL Server \u4e2d\u5275\u5efa\u9396<\/h3>\n<p>\u5728 SQL Server \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>WITH (UPDLOCK)<\/code> \u4f86\u5275\u5efa\u5171\u4eab\u9396\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM my_table WITH (UPDLOCK) WHERE id = 1;<\/code><\/pre>\n<p>\u9019\u5c07\u5c0d\u9078\u5b9a\u7684\u884c\u65bd\u52a0\u5171\u4eab\u9396\uff0c\u9632\u6b62\u5176\u4ed6\u4e8b\u52d9\u4fee\u6539\u3002<\/p>\n<h2 id=\"%e9%8e%96%e7%9a%84%e7%ae%a1%e7%90%86%e8%88%87%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-VbDUfwIjBv\">\u9396\u7684\u7ba1\u7406\u8207\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u4f7f\u7528\u6578\u64da\u5eab\u9396\u6642\uff0c\u61c9\u9075\u5faa\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\uff0c\u4ee5\u907f\u514d\u6b7b\u9396\u548c\u6027\u80fd\u554f\u984c\uff1a<\/p>\n<ul>\n<li>\u76e1\u91cf\u6e1b\u5c11\u9396\u7684\u6301\u6709\u6642\u9593\uff0c\u5feb\u901f\u5b8c\u6210\u4e8b\u52d9\u3002<\/li>\n<li>\u907f\u514d\u5728\u9577\u6642\u9593\u904b\u884c\u7684\u4e8b\u52d9\u4e2d\u6301\u6709\u9396\u3002<\/li>\n<li>\u4f7f\u7528\u9069\u7576\u7684\u9396\u985e\u578b\uff0c\u6839\u64da\u9700\u8981\u9078\u64c7\u5171\u4eab\u9396\u6216\u6392\u4ed6\u9396\u3002<\/li>\n<li>\u5b9a\u671f\u76e3\u63a7\u9396\u7684\u4f7f\u7528\u60c5\u6cc1\uff0c\u53ca\u6642\u8abf\u6574\u9396\u7b56\u7565\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-VbDUfwIjBv\">\u7e3d\u7d50<\/h2>\n<p>\u6578\u64da\u5eab\u9396\u662f\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u7684\u91cd\u8981\u5de5\u5177\u3002\u901a\u904e\u4e86\u89e3\u4e0d\u540c\u985e\u578b\u7684\u9396\u53ca\u5176\u5728\u5404\u7a2e\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\u7684\u5be6\u73fe\u65b9\u5f0f\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u5eab\u7684\u4e26\u767c\u8a2a\u554f\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\u53ef\u4ee5\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u53ef\u9760\u7684\u6578\u64da\u7ba1\u7406\u80fd\u529b\u3002\u7121\u8ad6\u662f\u9078\u64c7 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u90fd\u80fd\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u5f37\u6709\u529b\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5275\u5efa\u6578\u64da\u5eab\u9396\u4ee5\u4fdd\u8b77\u6578\u64da\u5b8c\u6574\u6027\uff0c\u907f\u514d\u4e26\u767c\u8a2a\u554f\u554f\u984c\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u5b89\u5168\u6027\u548c\u4e00\u81f4\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-173229","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173229","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=173229"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173229\/revisions"}],"predecessor-version":[{"id":173230,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/173229\/revisions\/173230"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=173229"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=173229"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=173229"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}