{"id":27226,"date":"2024-11-24T09:10:26","date_gmt":"2024-11-24T01:10:26","guid":{"rendered":"https:\/\/fwq.ai\/blog\/27226\/"},"modified":"2024-11-24T09:10:26","modified_gmt":"2024-11-24T01:10:26","slug":"%e5%b9%b6%e5%8f%91%e8%af%b7%e6%b1%82%e4%b8%8b%e7%9a%84%e6%95%b0%e6%8d%ae%e5%ba%93%e9%94%81%ef%bc%9a%e5%85%88%e5%88%a0%e7%bc%93%e5%ad%98%e8%bf%98%e6%98%af%e5%85%88%e6%9b%b4%e6%96%b0%e6%95%b0%e6%8d%ae-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/27226\/","title":{"rendered":"\u5e76\u53d1\u8bf7\u6c42\u4e0b\u7684\u6570\u636e\u5e93\u9501\uff1a\u5148\u5220\u7f13\u5b58\u8fd8\u662f\u5148\u66f4\u65b0\u6570\u636e\u5e93\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173121390469681.jpg\" class=\"aligncenter\" title=\"\u5e76\u53d1\u8bf7\u6c42\u4e0b\u7684\u6570\u636e\u5e93\u9501\uff1a\u5148\u5220\u7f13\u5b58\u8fd8\u662f\u5148\u66f4\u65b0\u6570\u636e\u5e93\uff1f\u63d2\u56fe\" alt=\"\u5e76\u53d1\u8bf7\u6c42\u4e0b\u7684\u6570\u636e\u5e93\u9501\uff1a\u5148\u5220\u7f13\u5b58\u8fd8\u662f\u5148\u66f4\u65b0\u6570\u636e\u5e93\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>\u6570\u636e\u5e93\u9501\u673a\u5236\u63a2\u79d8\uff1a\u5e76\u53d1\u5220\u9664\u7f13\u5b58\u4e0e\u66f4\u65b0\u6570\u636e\u5e93\u65f6\u7684\u8fd0\u4f5c\u539f\u7406<\/strong><\/p>\n<p><strong>\u95ee\u9898<\/strong><\/p>\n<p>\u5728\u5904\u7406\u65f6\uff0c\u5bf9\u4e8e\u5148\u5220\u9664\u7f13\u5b58\u8fd8\u662f\u5148\u66f4\u65b0\u6570\u636e\u5e93\u8fd9\u4e2a\u95ee\u9898\uff0c\u65f6\u5e8f\u56fe\u7684\u7ed8\u5236\u6709\u52a9\u4e8e\u7406\u89e3\u6570\u636e\u5e93\u9501\u673a\u5236\u7684\u4f5c\u7528\u3002\u4f46\u662f\uff0c\u5bf9\u4e8e\u6570\u636e\u5e93\u9501\u7684\u5b9e\u9645\u8fd0\u4f5c\u65b9\u5f0f\u662f\u5426\u5b58\u5728\u8bef\u89e3\uff1f<\/p>\n<p><strong>\u89e3\u6790<\/strong><\/p>\n<p>\u4ece\u7ed8\u5236\u7684\u65f6\u5e8f\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c\u9488\u5bf9\u4e0d\u540c\u7684\u6570\u636e\u5e93\u64cd\u4f5c\uff0c\u9501\u7684\u8fd0\u4f5c\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li> <strong>\u66f4\u65b0\u64cd\u4f5c (Thread 1):<\/strong> \u52a0\u4e0a<strong>\u72ec\u5360\u9501<\/strong>\uff0c\u9632\u6b62\u5176\u4ed6\u7ebf\u7a0b\u540c\u65f6\u66f4\u65b0\u76f8\u540c\u6570\u636e\u3002<\/li>\n<li> <strong>\u8bfb\u64cd\u4f5c (Thread 2):<\/strong> \u4f7f\u7528<strong>\u975e\u9501\u5b9a\u8bfb<\/strong>\uff0c\u4e0d\u52a0\u9501\uff0c\u56e0\u6b64\u53ef\u4ee5\u4e0e\u66f4\u65b0\u64cd\u4f5c\u540c\u65f6\u8fdb\u884c\u3002<\/li>\n<li> <strong>select &#8230; for update (Thread 3):<\/strong> \u52a0\u4e0a<strong>\u6392\u4ed6\u9501<\/strong>\uff0c\u7981\u6b62\u5176\u4ed6\u7ebf\u7a0b\u66f4\u65b0\u6570\u636e\uff0c\u76f4\u5230\u91ca\u653e\u9501\u3002<\/li>\n<\/ul>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0cMySQL\u9ed8\u8ba4\u7684\u8bfb\u64cd\u4f5c\u662f<strong>\u975e\u9501\u5b9a\u8bfb<\/strong>\uff0c\u4e5f\u79f0\u4e3a<strong>\u5feb\u7167\u8bfb<\/strong>\uff0c\u5176\u4e0d\u4f1a\u5bf9\u6570\u636e\u52a0\u9501\u3002\u56e0\u6b64\uff0c\u5c3d\u7ba1\u66f4\u65b0\u64cd\u4f5c\u5904\u4e8e\u72ec\u5360\u9501\u72b6\u6001\uff0c\u4f46\u67e5\u8be2\u64cd\u4f5c\u4ecd\u53ef\u4ee5\u540c\u65f6\u8fdb\u884c\u3002<\/p>\n<p><strong>MVCC\u673a\u5236<\/strong><\/p>\n<p>MySQL\u91c7\u7528<strong>\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236 (MVCC)<\/strong> \u673a\u5236\u6765\u89e3\u51b3\u5e76\u53d1\u95ee\u9898\u3002\u901a\u8fc7\u4fdd\u5b58\u6570\u636e\u7684\u6bcf\u4e2a\u5386\u53f2\u7248\u672c\uff0cMVCC\u5141\u8bb8\u8bfb\u64cd\u4f5c\u5728\u4e0d\u52a0\u9501\u7684\u60c5\u51b5\u4e0b\u67e5\u770b\u6570\u636e\u5e93\u7684\u7279\u5b9a\u65f6\u95f4\u70b9\u3002<\/p>\n<p><strong>\u65f6\u5e8f\u56fe\u5206\u6790<\/strong><\/p>\n<p>\u6839\u636e\u63d0\u4f9b\u7684\u65f6\u5e8f\u56fe\uff0c\u53ef\u4ee5\u5224\u5b9a\u5bf9\u6570\u636e\u5e93\u9501\u7684\u7406\u89e3\u57fa\u672c\u6b63\u786e\u3002\u5e76\u53d1\u5220\u9664\u7f13\u5b58\u548c\u66f4\u65b0\u6570\u636e\u5e93\u65f6\uff0c\u4f1a\u51fa\u73b0\u4ee5\u4e0b\u60c5\u51b5\uff1a<\/p>\n<ol>\n<li>Thread 1 \u5bf9\u6570\u636e\u8fdb\u884c\u66f4\u65b0\u64cd\u4f5c\uff0c\u52a0\u4e0a\u72ec\u5360\u9501\u3002<\/li>\n<li>Thread 2 \u5bf9\u6570\u636e\u8fdb\u884c\u67e5\u8be2\u64cd\u4f5c\uff0c\u7531\u4e8e\u91c7\u7528\u975e\u9501\u5b9a\u8bfb\uff0c\u56e0\u6b64\u53ef\u4ee5\u5feb\u901f\u8fd4\u56de\u7ed3\u679c\u3002<\/li>\n<li>Thread 3 \u5bf9\u6570\u636e\u6267\u884c select &#8230; for update \u64cd\u4f5c\uff0c\u52a0\u4e0a\u6392\u4ed6\u9501\uff0c\u5bfc\u81f4\u5176\u4ed6\u7ebf\u7a0b\u5fc5\u987b\u7b49\u5f85\u3002<\/li>\n<\/ol>\n<p>\u56e0\u6b64\uff0c\u540c\u65f6\u8fdb\u884c\u7684\u8bfb\u548c\u66f4\u65b0\u64cd\u4f5c\u5e76\u4e0d\u4f1a\u8fdd\u53cd\u9501\u673a\u5236\u7684\u539f\u5219\u3002\u53ea\u6709\u5f53\u9700\u8981\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u65f6\uff0c\u624d\u9700\u8981\u4f7f\u7528\u6392\u4ed6\u9501\u3002<\/p>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>\u901a\u8fc7\u5bf9\u65f6\u5e8f\u56fe\u7684\u5206\u6790\u548c\u6570\u636e\u5e93\u9501\u673a\u5236\u7684\u6df1\u5165\u7406\u89e3\uff0c\u53ef\u4ee5\u66f4\u6e05\u6670\u5730\u628a\u63e1\u5e76\u53d1\u8bf7\u6c42\u5904\u7406\u4e2d\u7684\u9501\u7b56\u7565\uff0c\u4e3a\u6570\u636e\u5e93\u8bbe\u8ba1\u548c\u4f18\u5316\u63d0\u4f9b\u4f9d\u636e\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u4e0b\u7684\u6570\u636e\u5e93\u9501\uff1a\u5148\u5220\u7f13\u5b58\u8fd8\u662f\u5148\u66f4\u65b0\u6570\u636e\u5e93\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6570\u636e\u5e93\u9501\u673a\u5236\u63a2\u79d8\uff1a\u5e76\u53d1\u5220\u9664\u7f13\u5b58\u4e0e\u66f4\u65b0\u6570\u636e\u5e93\u65f6\u7684\u8fd0\u4f5c\u539f\u7406 \u95ee\u9898 \u5728\u5904\u7406\u65f6\uff0c\u5bf9\u4e8e\u5148\u5220\u9664\u7f13\u5b58\u8fd8\u662f\u5148\u66f4\u65b0\u6570\u636e\u5e93\u8fd9\u4e2a\u95ee\u9898\uff0c\u65f6\u5e8f\u56fe\u7684\u7ed8\u5236\u6709\u52a9\u4e8e\u7406\u89e3\u6570\u636e\u5e93\u9501\u673a\u5236\u7684\u4f5c\u7528\u3002\u4f46\u662f\uff0c\u5bf9\u4e8e\u6570\u636e\u5e93\u9501\u7684\u5b9e\u9645\u8fd0\u4f5c\u65b9\u5f0f\u662f\u5426\u5b58\u5728\u8bef\u89e3\uff1f \u89e3\u6790 \u4ece\u7ed8\u5236\u7684\u65f6\u5e8f\u56fe\u53ef\u4ee5\u770b\u51fa\uff0c\u9488\u5bf9\u4e0d\u540c\u7684\u6570\u636e\u5e93\u64cd\u4f5c\uff0c\u9501\u7684\u8fd0\u4f5c\u65b9\u5f0f\u5982\u4e0b\uff1a \u66f4\u65b0\u64cd\u4f5c (Thread 1): \u52a0\u4e0a\u72ec\u5360\u9501\uff0c\u9632\u6b62\u5176\u4ed6\u7ebf\u7a0b\u540c\u65f6\u66f4\u65b0\u76f8\u540c\u6570\u636e\u3002 \u8bfb\u64cd\u4f5c (Thread 2): \u4f7f\u7528\u975e\u9501\u5b9a\u8bfb\uff0c\u4e0d\u52a0\u9501\uff0c\u56e0\u6b64\u53ef\u4ee5\u4e0e\u66f4\u65b0\u64cd\u4f5c\u540c\u65f6\u8fdb\u884c\u3002 select &#8230; for update (Thread 3): \u52a0\u4e0a\u6392\u4ed6\u9501\uff0c\u7981\u6b62\u5176\u4ed6\u7ebf\u7a0b\u66f4\u65b0\u6570\u636e\uff0c\u76f4\u5230\u91ca\u653e\u9501\u3002 \u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0cMySQL\u9ed8\u8ba4\u7684\u8bfb\u64cd\u4f5c\u662f\u975e\u9501\u5b9a\u8bfb\uff0c\u4e5f\u79f0\u4e3a\u5feb\u7167\u8bfb\uff0c\u5176\u4e0d\u4f1a\u5bf9\u6570\u636e\u52a0\u9501\u3002\u56e0\u6b64\uff0c\u5c3d\u7ba1\u66f4\u65b0\u64cd\u4f5c\u5904\u4e8e\u72ec\u5360\u9501\u72b6\u6001\uff0c\u4f46\u67e5\u8be2\u64cd\u4f5c\u4ecd\u53ef\u4ee5\u540c\u65f6\u8fdb\u884c\u3002 MVCC\u673a\u5236 MySQL\u91c7\u7528\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236 (MVCC) \u673a\u5236\u6765\u89e3\u51b3\u5e76\u53d1\u95ee\u9898\u3002\u901a\u8fc7\u4fdd\u5b58\u6570\u636e\u7684\u6bcf\u4e2a\u5386\u53f2\u7248\u672c\uff0cMVCC\u5141\u8bb8\u8bfb\u64cd\u4f5c\u5728\u4e0d\u52a0\u9501\u7684\u60c5\u51b5\u4e0b\u67e5\u770b\u6570\u636e\u5e93\u7684\u7279\u5b9a\u65f6\u95f4\u70b9\u3002 \u65f6\u5e8f\u56fe\u5206\u6790 \u6839\u636e\u63d0\u4f9b\u7684\u65f6\u5e8f\u56fe\uff0c\u53ef\u4ee5\u5224\u5b9a\u5bf9\u6570\u636e\u5e93\u9501\u7684\u7406\u89e3\u57fa\u672c\u6b63\u786e\u3002\u5e76\u53d1\u5220\u9664\u7f13\u5b58\u548c\u66f4\u65b0\u6570\u636e\u5e93\u65f6\uff0c\u4f1a\u51fa\u73b0\u4ee5\u4e0b\u60c5\u51b5\uff1a Thread 1 \u5bf9\u6570\u636e\u8fdb\u884c\u66f4\u65b0\u64cd\u4f5c\uff0c\u52a0\u4e0a\u72ec\u5360\u9501\u3002 Thread 2 \u5bf9\u6570\u636e\u8fdb\u884c\u67e5\u8be2\u64cd\u4f5c\uff0c\u7531\u4e8e\u91c7\u7528\u975e\u9501\u5b9a\u8bfb\uff0c\u56e0\u6b64\u53ef\u4ee5\u5feb\u901f\u8fd4\u56de\u7ed3\u679c\u3002 Thread 3 \u5bf9\u6570\u636e\u6267\u884c select &#8230; for update \u64cd\u4f5c\uff0c\u52a0\u4e0a\u6392\u4ed6\u9501\uff0c\u5bfc\u81f4\u5176\u4ed6\u7ebf\u7a0b\u5fc5\u987b\u7b49\u5f85\u3002 \u56e0\u6b64\uff0c\u540c\u65f6\u8fdb\u884c\u7684\u8bfb\u548c\u66f4\u65b0\u64cd\u4f5c\u5e76\u4e0d\u4f1a\u8fdd\u53cd\u9501\u673a\u5236\u7684\u539f\u5219\u3002\u53ea\u6709\u5f53\u9700\u8981\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u65f6\uff0c\u624d\u9700\u8981\u4f7f\u7528\u6392\u4ed6\u9501\u3002 \u7ed3\u8bba \u901a\u8fc7\u5bf9\u65f6\u5e8f\u56fe\u7684\u5206\u6790\u548c\u6570\u636e\u5e93\u9501\u673a\u5236\u7684\u6df1\u5165\u7406\u89e3\uff0c\u53ef\u4ee5\u66f4\u6e05\u6670\u5730\u628a\u63e1\u5e76\u53d1\u8bf7\u6c42\u5904\u7406\u4e2d\u7684\u9501\u7b56\u7565\uff0c\u4e3a\u6570\u636e\u5e93\u8bbe\u8ba1\u548c\u4f18\u5316\u63d0\u4f9b\u4f9d\u636e\u3002 \u4ee5\u4e0a\u5c31\u662f\u4e0b\u7684\u6570\u636e\u5e93\u9501\uff1a\u5148\u5220\u7f13\u5b58\u8fd8\u662f\u5148\u66f4\u65b0\u6570\u636e\u5e93\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-27226","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/27226","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=27226"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/27226\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=27226"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=27226"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=27226"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}