{"id":6364,"date":"2024-07-18T20:14:47","date_gmt":"2024-07-18T12:14:47","guid":{"rendered":"https:\/\/t.n-years.com\/?p=6364"},"modified":"2024-07-18T20:14:47","modified_gmt":"2024-07-18T12:14:47","slug":"%e6%95%b0%e6%8d%ae%e5%ba%93%e8%a1%8c%e9%94%81%e3%80%81%e5%88%97%e9%94%81%e5%8f%8a%e5%ae%9e%e7%8e%b0%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/t.n-years.com\/?p=6364","title":{"rendered":"\u6570\u636e\u5e93\u884c\u9501\u3001\u5217\u9501\u53ca\u5b9e\u73b0\u539f\u7406"},"content":{"rendered":"<p>\u884c\u9501\u548c\u5217\u9501\u662f\u6570\u636e\u5e93\u9501\u673a\u5236\u7684\u4e00\u90e8\u5206\uff0c\u7528\u4e8e\u63a7\u5236\u5e76\u53d1\u8bbf\u95ee\uff0c\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u5e76\u9632\u6b62\u51b2\u7a81\u3002\u4e0b\u9762\u662f\u5bf9\u884c\u9501\u548c\u5217\u9501\u7684\u8be6\u7ec6\u89e3\u91ca\u4ee5\u53ca\u5176\u5b9e\u73b0\u539f\u7406\u3002<\/p>\n<h3>\u884c\u9501\uff08Row Lock\uff09<\/h3>\n<p><strong>\u5b9a\u4e49<\/strong>\uff1a<br \/>\n\u884c\u9501\u662f\u4e00\u79cd\u7c92\u5ea6\u8f83\u5c0f\u7684\u9501\u673a\u5236\uff0c\u5b83\u9501\u5b9a\u6570\u636e\u5e93\u8868\u4e2d\u7684\u5355\u884c\u8bb0\u5f55\uff0c\u4ee5\u9632\u6b62\u5176\u4ed6\u4e8b\u52a1\u5728\u540c\u4e00\u65f6\u95f4\u4fee\u6539\u76f8\u540c\u7684\u884c\u3002\u8fd9\u79cd\u9501\u673a\u5236\u5728\u5904\u7406\u5e76\u53d1\u64cd\u4f5c\u65f6\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u5e76\u53d1\u6027\u548c\u6027\u80fd\u3002<\/p>\n<p><strong>\u7c7b\u578b<\/strong>\uff1a<\/p>\n<ul>\n<li><strong>\u5171\u4eab\u9501\uff08S\u9501\uff0cShared Lock\uff09<\/strong>\uff1a\u5141\u8bb8\u591a\u4e2a\u4e8b\u52a1\u540c\u65f6\u8bfb\u53d6\u4e00\u884c\uff0c\u4f46\u4e0d\u5141\u8bb8\u4fee\u6539\u3002<\/li>\n<li><strong>\u6392\u4ed6\u9501\uff08X\u9501\uff0cExclusive Lock\uff09<\/strong>\uff1a\u4e0d\u5141\u8bb8\u5176\u4ed6\u4e8b\u52a1\u8bfb\u53d6\u6216\u4fee\u6539\u88ab\u9501\u5b9a\u7684\u884c\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u73b0\u539f\u7406<\/strong>\uff1a<br \/>\n\u884c\u9501\u901a\u5e38\u7531\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff08DBMS\uff09\u5185\u90e8\u5b9e\u73b0\uff0c\u901a\u8fc7\u5728\u8bb0\u5f55\u4e0a\u8bbe\u7f6e\u6807\u8bb0\u6765\u5b9e\u73b0\u3002\u4ee5\u4e0b\u662f\u5e38\u89c1\u6570\u636e\u5e93\u4e2d\u7684\u884c\u9501\u5b9e\u73b0\u65b9\u6cd5\uff1a<\/p>\n<ol>\n<li>\n<p><strong>Oracle<\/strong>\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528\u884c\u7ea7\u9501\uff08Row-level Locking\uff09\uff0c\u901a\u8fc7\u5728\u6570\u636e\u5757\u4e2d\u7684\u884c\u9996\u90e8\u52a0\u9501\u6807\u8bb0\u6765\u5b9e\u73b0\u3002<\/li>\n<li>\u4f7f\u7528\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff08MVCC\uff09\uff0c\u4fdd\u8bc1\u8bfb\u53d6\u64cd\u4f5c\u4e0d\u53d7\u5199\u5165\u9501\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>MySQL\uff08InnoDB\u5f15\u64ce\uff09<\/strong>\uff1a<\/p>\n<ul>\n<li>InnoDB \u4f7f\u7528\u884c\u9501\uff08\u57fa\u4e8e\u7d22\u5f15\u7684\u9501\uff09\uff0c\u901a\u8fc7\u5728\u805a\u7c07\u7d22\u5f15\uff08Clustered Index\uff09\u4e0a\u7684\u8bb0\u5f55\u52a0\u9501\u5b9e\u73b0\u3002<\/li>\n<li>\u652f\u6301 MVCC\uff0c\u8bfb\u53d6\u64cd\u4f5c\u4e0d\u4f1a\u963b\u585e\u5199\u5165\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p><strong>\u793a\u4f8b<\/strong>\uff1a<\/p>\n<pre><code class=\"language-sql\">-- \u5f00\u542f\u4e8b\u52a1\nSTART TRANSACTION;\n\n-- \u4e3a\u884c\u6dfb\u52a0\u6392\u4ed6\u9501\nSELECT * FROM employees WHERE employee_id = 1 FOR UPDATE;\n\n-- \u63d0\u4ea4\u4e8b\u52a1\nCOMMIT;<\/code><\/pre>\n<h3>\u5217\u9501\uff08Column Lock\uff09<\/h3>\n<p><strong>\u5b9a\u4e49<\/strong>\uff1a<br \/>\n\u5217\u9501\u662f\u4e00\u79cd\u7c92\u5ea6\u66f4\u5c0f\u7684\u9501\u673a\u5236\uff0c\u5b83\u9501\u5b9a\u6570\u636e\u5e93\u8868\u4e2d\u7684\u67d0\u4e00\u5217\u3002\u5217\u9501\u7684\u4f7f\u7528\u76f8\u5bf9\u8f83\u5c11\uff0c\u56e0\u4e3a\u9501\u5b9a\u5355\u4e2a\u5217\u7684\u5f00\u9500\u8f83\u9ad8\uff0c\u4e14\u5b9e\u73b0\u590d\u6742\u3002<\/p>\n<p><strong>\u7c7b\u578b<\/strong>\uff1a<\/p>\n<ul>\n<li><strong>\u5171\u4eab\u9501\uff08S\u9501\uff09<\/strong>\uff1a\u5141\u8bb8\u591a\u4e2a\u4e8b\u52a1\u540c\u65f6\u8bfb\u53d6\u4e00\u5217\uff0c\u4f46\u4e0d\u5141\u8bb8\u4fee\u6539\u3002<\/li>\n<li><strong>\u6392\u4ed6\u9501\uff08X\u9501\uff09<\/strong>\uff1a\u4e0d\u5141\u8bb8\u5176\u4ed6\u4e8b\u52a1\u8bfb\u53d6\u6216\u4fee\u6539\u88ab\u9501\u5b9a\u7684\u5217\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u73b0\u539f\u7406<\/strong>\uff1a<br \/>\n\u5217\u9501\u5728\u4e00\u4e9b\u6570\u636e\u5e93\u7cfb\u7edf\u4e2d\u652f\u6301\u6709\u9650\uff0c\u901a\u5e38\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u5b9e\u73b0\uff1a<\/p>\n<ol>\n<li>\n<p><strong>\u7ec6\u7c92\u5ea6\u9501\uff08Fine-grained Locking\uff09<\/strong>\uff1a<\/p>\n<ul>\n<li>\u7ec6\u7c92\u5ea6\u9501\u5728\u6570\u636e\u6a21\u578b\u6216\u4e1a\u52a1\u903b\u8f91\u5c42\u5b9e\u73b0\uff0c\u800c\u4e0d\u662f\u6570\u636e\u5e93\u5c42\u3002\u4f8b\u5982\uff0c\u901a\u8fc7\u5e94\u7528\u7a0b\u5e8f\u63a7\u5236\u5217\u7684\u5e76\u53d1\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>\u6570\u636e\u5e93\u81ea\u5b9a\u4e49\u5b9e\u73b0<\/strong>\uff1a<\/p>\n<ul>\n<li>\u4e00\u4e9b\u6570\u636e\u5e93\u7cfb\u7edf\u53ef\u4ee5\u901a\u8fc7\u81ea\u5b9a\u4e49\u9501\u673a\u5236\u5b9e\u73b0\u5217\u9501\uff0c\u4f46\u8fd9\u901a\u5e38\u9700\u8981\u5927\u91cf\u7684\u5f00\u53d1\u548c\u7ef4\u62a4\u5de5\u4f5c\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p><strong>\u793a\u4f8b<\/strong>\uff1a<br \/>\n\u5927\u591a\u6570\u6570\u636e\u5e93\u4e0d\u76f4\u63a5\u652f\u6301\u5217\u9501\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u6a21\u62df\uff1a<\/p>\n<pre><code class=\"language-sql\">-- \u5047\u8bbe\u6709\u4e00\u5f20 employees \u8868\uff0c\u9700\u8981\u9501\u5b9a salary \u5217\n-- \u4f7f\u7528\u5e94\u7528\u7a0b\u5e8f\u63a7\u5236\u5e76\u53d1\u8bbf\u95ee<\/code><\/pre>\n<h3>\u603b\u7ed3<\/h3>\n<p><strong>\u884c\u9501\uff08Row Lock\uff09<\/strong>\uff1a<\/p>\n<ul>\n<li>\u9501\u5b9a\u5355\u884c\u8bb0\u5f55\u3002<\/li>\n<li>\u63d0\u9ad8\u5e76\u53d1\u6027\u548c\u6027\u80fd\u3002<\/li>\n<li>\u5e38\u89c1\u4e8e\u5927\u591a\u6570\u6570\u636e\u5e93\u7cfb\u7edf\uff0c\u5982 Oracle\u3001MySQL\uff08InnoDB\uff09\u3002<\/li>\n<\/ul>\n<p><strong>\u5217\u9501\uff08Column Lock\uff09<\/strong>\uff1a<\/p>\n<ul>\n<li>\u9501\u5b9a\u5355\u5217\u6570\u636e\u3002<\/li>\n<li>\u5b9e\u73b0\u590d\u6742\u4e14\u5f00\u9500\u5927\uff0c\u8f83\u5c11\u4f7f\u7528\u3002<\/li>\n<li>\u53ef\u4ee5\u901a\u8fc7\u7ec6\u7c92\u5ea6\u9501\u6216\u81ea\u5b9a\u4e49\u5b9e\u73b0\u3002<\/li>\n<\/ul>\n<p>\u6570\u636e\u5e93\u9501\u673a\u5236\u7684\u8bbe\u8ba1\u9700\u8981\u5728\u6570\u636e\u4e00\u81f4\u6027\u548c\u7cfb\u7edf\u6027\u80fd\u4e4b\u95f4\u8fdb\u884c\u6743\u8861\u3002\u9009\u62e9\u5408\u9002\u7684\u9501\u673a\u5236\u53ef\u4ee5\u63d0\u9ad8\u7cfb\u7edf\u7684\u5e76\u53d1\u6027\uff0c\u51cf\u5c11\u6570\u636e\u51b2\u7a81\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u884c\u9501\u548c\u5217\u9501\u662f\u6570\u636e\u5e93\u9501\u673a\u5236\u7684\u4e00\u90e8\u5206\uff0c\u7528\u4e8e\u63a7\u5236\u5e76\u53d1\u8bbf\u95ee\uff0c\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u5e76\u9632\u6b62\u51b2\u7a81\u3002\u4e0b\u9762\u662f\u5bf9\u884c\u9501\u548c\u5217\u9501\u7684\u8be6\u7ec6\u89e3\u91ca\u4ee5\u53ca&#8230; <\/p>\n<div class=\"read-more navbutton\"><a href=\"https:\/\/t.n-years.com\/?p=6364\">\u9605\u8bfb\u66f4\u591a<i class=\"fa fa-angle-double-right\"><\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[123],"tags":[108],"class_list":["post-6364","post","type-post","status-publish","format-standard","hentry","category-123","tag-108"],"_links":{"self":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6364","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6364"}],"version-history":[{"count":1,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6364\/revisions"}],"predecessor-version":[{"id":6365,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6364\/revisions\/6365"}],"wp:attachment":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6364"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6364"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6364"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}