{"id":64,"date":"2023-02-21T08:48:21","date_gmt":"2023-02-21T08:48:21","guid":{"rendered":"https:\/\/blessingcr.com\/?p=64"},"modified":"2023-02-21T08:48:23","modified_gmt":"2023-02-21T08:48:23","slug":"%e4%ba%8b%e5%8a%a1%e9%9a%94%e7%a6%bb%e7%ba%a7%e5%88%ab","status":"publish","type":"post","link":"https:\/\/blessingcr.com\/?p=64","title":{"rendered":"\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"_MeXWdmjh\">\u5e76\u53d1\u5e26\u6765\u7684\u95ee\u9898<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u810f\u8bfb\uff08Dirty read\uff09:<\/strong>&nbsp;\u5f53\u4e00\u4e2a\u4e8b\u52a1\u6b63\u5728\u8bbf\u95ee\u6570\u636e\u5e76\u4e14\u5bf9\u6570\u636e\u8fdb\u884c\u4e86\u4fee\u6539\uff0c\u800c\u8fd9\u79cd\u4fee\u6539\u8fd8\u6ca1\u6709\u63d0\u4ea4\u5230\u6570\u636e\u5e93\u4e2d\uff0c\u8fd9\u65f6\u53e6\u5916\u4e00\u4e2a\u4e8b\u52a1\u4e5f\u8bbf\u95ee\u4e86\u8fd9\u4e2a\u6570\u636e\uff0c\u7136\u540e\u4f7f\u7528\u4e86\u8fd9\u4e2a\u6570\u636e\u3002\u56e0\u4e3a\u8fd9\u4e2a\u6570\u636e\u662f\u8fd8\u6ca1\u6709\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u90a3\u4e48\u53e6\u5916\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u5230\u7684\u8fd9\u4e2a\u6570\u636e\u662f\u201c\u810f\u6570\u636e\u201d\uff0c\u4f9d\u636e\u201c\u810f\u6570\u636e\u201d\u6240\u505a\u7684\u64cd\u4f5c\u53ef\u80fd\u662f\u4e0d\u6b63\u786e\u7684\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4e22\u5931\u4fee\u6539\uff08Lost to modify\uff09:<\/strong>&nbsp;\u6307\u5728\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u53d6\u4e00\u4e2a\u6570\u636e\u65f6\uff0c\u53e6\u5916\u4e00\u4e2a\u4e8b\u52a1\u4e5f\u8bbf\u95ee\u4e86\u8be5\u6570\u636e\uff0c\u90a3\u4e48\u5728\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u4fee\u6539\u4e86\u8fd9\u4e2a\u6570\u636e\u540e\uff0c\u7b2c\u4e8c\u4e2a\u4e8b\u52a1\u4e5f\u4fee\u6539\u4e86\u8fd9\u4e2a\u6570\u636e\u3002\u8fd9\u6837\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u5185\u7684\u4fee\u6539\u7ed3\u679c\u5c31\u88ab\u4e22\u5931\uff0c\u56e0\u6b64\u79f0\u4e3a\u4e22\u5931\u4fee\u6539\u3002 \u4f8b\u5982\uff1a\u4e8b\u52a1 1 \u8bfb\u53d6\u67d0\u8868\u4e2d\u7684\u6570\u636e A=20\uff0c\u4e8b\u52a1 2 \u4e5f\u8bfb\u53d6 A=20\uff0c\u4e8b\u52a1 1 \u4fee\u6539 A=A-1\uff0c\u4e8b\u52a1 2 \u4e5f\u4fee\u6539 A=A-1\uff0c\u6700\u7ec8\u7ed3\u679c A=19\uff0c\u4e8b\u52a1 1 \u7684\u4fee\u6539\u88ab\u4e22\u5931\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4e0d\u53ef\u91cd\u590d\u8bfb\uff08Unrepeatable read\uff09:<\/strong>&nbsp;\u6307\u5728\u4e00\u4e2a\u4e8b\u52a1\u5185\u591a\u6b21\u8bfb\u540c\u4e00\u6570\u636e\u3002\u5728\u8fd9\u4e2a\u4e8b\u52a1\u8fd8\u6ca1\u6709\u7ed3\u675f\u65f6\uff0c\u53e6\u4e00\u4e2a\u4e8b\u52a1\u4e5f\u8bbf\u95ee\u8be5\u6570\u636e\u3002\u90a3\u4e48\uff0c\u5728\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u7684\u4e24\u6b21\u8bfb\u6570\u636e\u4e4b\u95f4\uff0c\u7531\u4e8e\u7b2c\u4e8c\u4e2a\u4e8b\u52a1\u7684\u4fee\u6539\u5bfc\u81f4\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u4e24\u6b21\u8bfb\u53d6\u7684\u6570\u636e\u53ef\u80fd\u4e0d\u592a\u4e00\u6837\u3002\u8fd9\u5c31\u53d1\u751f\u4e86\u5728\u4e00\u4e2a\u4e8b\u52a1\u5185\u4e24\u6b21\u8bfb\u5230\u7684\u6570\u636e\u662f\u4e0d\u4e00\u6837\u7684\u60c5\u51b5\uff0c\u56e0\u6b64\u79f0\u4e3a\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5e7b\u8bfb\uff08Phantom read\uff09:<\/strong>&nbsp;\u5e7b\u8bfb\u4e0e\u4e0d\u53ef\u91cd\u590d\u8bfb\u7c7b\u4f3c\u3002\u5b83\u53d1\u751f\u5728\u4e00\u4e2a\u4e8b\u52a1\uff08T1\uff09\u8bfb\u53d6\u4e86\u51e0\u884c\u6570\u636e\uff0c\u63a5\u7740\u53e6\u4e00\u4e2a\u5e76\u53d1\u4e8b\u52a1\uff08T2\uff09\u63d2\u5165\u4e86\u4e00\u4e9b\u6570\u636e\u65f6\u3002\u5728\u968f\u540e\u7684\u67e5\u8be2\u4e2d\uff0c\u7b2c\u4e00\u4e2a\u4e8b\u52a1\uff08T1\uff09\u5c31\u4f1a\u53d1\u73b0\u591a\u4e86\u4e00\u4e9b\u539f\u672c\u4e0d\u5b58\u5728\u7684\u8bb0\u5f55\uff0c\u5c31\u597d\u50cf\u53d1\u751f\u4e86\u5e7b\u89c9\u4e00\u6837\uff0c\u6240\u4ee5\u79f0\u4e3a\u5e7b\u8bfb\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e0d\u53ef\u91cd\u590d\u8bfb\u548c\u5e7b\u8bfb\u6709\u4ec0\u4e48\u533a\u522b\u5462\uff1f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0d\u53ef\u91cd\u590d\u8bfb\u7684\u91cd\u70b9\u662f\u5185\u5bb9\u4fee\u6539\u6216\u8005\u8bb0\u5f55\u51cf\u5c11\u6bd4\u5982\u591a\u6b21\u8bfb\u53d6\u4e00\u6761\u8bb0\u5f55\u53d1\u73b0\u5176\u4e2d\u67d0\u4e9b\u8bb0\u5f55\u7684\u503c\u88ab\u4fee\u6539\uff1b<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5e7b\u8bfb\u7684\u91cd\u70b9\u5728\u4e8e\u8bb0\u5f55\u65b0\u589e\u6bd4\u5982\u591a\u6b21\u6267\u884c\u540c\u4e00\u6761\u67e5\u8be2\u8bed\u53e5\uff08DQL\uff09\u65f6\uff0c\u53d1\u73b0\u67e5\u5230\u7684\u8bb0\u5f55\u589e\u52a0\u4e86\u3002<\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"_HQSgy4oX\">\u9694\u79bb\u7ea7\u522b<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>READ-UNCOMMITTED(\u8bfb\u53d6\u672a\u63d0\u4ea4)<\/strong>&nbsp;\uff1a \u6700\u4f4e\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5141\u8bb8\u8bfb\u53d6\u5c1a\u672a\u63d0\u4ea4\u7684\u6570\u636e\u53d8\u66f4\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u810f\u8bfb\u3001\u5e7b\u8bfb\u6216\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>READ-COMMITTED(\u8bfb\u53d6\u5df2\u63d0\u4ea4)<\/strong>&nbsp;\uff1a \u5141\u8bb8\u8bfb\u53d6\u5e76\u53d1\u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u963b\u6b62\u810f\u8bfb\uff0c\u4f46\u662f\u5e7b\u8bfb\u6216\u4e0d\u53ef\u91cd\u590d\u8bfb\u4ecd\u6709\u53ef\u80fd\u53d1\u751f\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>REPEATABLE-READ(\u53ef\u91cd\u590d\u8bfb)--\u9ed8\u8ba4\u7ea7\u522b<\/strong> \uff1a \u5bf9\u540c\u4e00\u5b57\u6bb5\u7684\u591a\u6b21\u8bfb\u53d6\u7ed3\u679c\u90fd\u662f\u4e00\u81f4\u7684\uff0c\u9664\u975e\u6570\u636e\u662f\u88ab\u672c\u8eab\u4e8b\u52a1\u81ea\u5df1\u6240\u4fee\u6539\uff0c\u53ef\u4ee5\u963b\u6b62\u810f\u8bfb\u548c\u4e0d\u53ef\u91cd\u590d\u8bfb\uff0c\u4f46\u5e7b\u8bfb\u4ecd\u6709\u53ef\u80fd\u53d1\u751f\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>SERIALIZABLE(\u53ef\u4e32\u884c\u5316)<\/strong>&nbsp;\uff1a \u6700\u9ad8\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5b8c\u5168\u670d\u4ece ACID \u7684\u9694\u79bb\u7ea7\u522b\u3002\u6240\u6709\u7684\u4e8b\u52a1\u4f9d\u6b21\u9010\u4e2a\u6267\u884c\uff0c\u8fd9\u6837\u4e8b\u52a1\u4e4b\u95f4\u5c31\u5b8c\u5168\u4e0d\u53ef\u80fd\u4ea7\u751f\u5e72\u6270\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u8be5\u7ea7\u522b\u53ef\u4ee5\u9632\u6b62\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u4ee5\u53ca\u5e7b\u8bfb\u3002<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><figure class=\"mdx-lazyload-container\" style=\"\"><div style=\"padding-top:50%\"><\/div><div class=\"mdx-img-loading-sp mdui-valign\"><div><div class=\"mdui-spinner\"><\/div><\/div><\/div><img class=\"lazyload\" title=\"\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/vipkshttps13.wiz.cn\/editor\/d43a29e0-2b90-11ed-a050-f704bb07f03a\/7479e927-d8c8-432a-ac82-6cd1b173a0b8\/resources\/6f30kjQ7ufqpLU_l_Fjqiq-txdPObDe056PA7jUU-ls.png?token=W.F9G02DWS5b-0Gi4p_Nl0JcaVuOLEelUtphTzPzkq2mJ-P3pPw8itvb9C-YOC-A8\" alt=\"https:\/\/vipkshttps13.wiz.cn\/editor\/d43a29e0-2b90-11ed-a050-f704bb07f03a\/7479e927-d8c8-432a-ac82-6cd1b173a0b8\/resources\/6f30kjQ7ufqpLU_l_Fjqiq-txdPObDe056PA7jUU-ls.png?token=W.F9G02DWS5b-0Gi4p_Nl0JcaVuOLEelUtphTzPzkq2mJ-P3pPw8itvb9C-YOC-A8\"><\/figure><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><\/li>\n<\/ul>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"_mmvfhnzc\">\u9694\u79bb\u5b9e\u73b0\u65b9\u5f0f<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">MySQL \u7684\u9694\u79bb\u7ea7\u522b\u57fa\u4e8e\u9501\u548c MVCC \u673a\u5236\u5171\u540c\u5b9e\u73b0\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SERIALIZABLE \u9694\u79bb\u7ea7\u522b\uff0c\u662f\u901a\u8fc7\u9501\u6765\u5b9e\u73b0\u7684\u3002\u9664\u4e86 SERIALIZABLE \u9694\u79bb\u7ea7\u522b\uff0c\u5176\u4ed6\u7684\u9694\u79bb\u7ea7\u522b\u90fd\u662f\u57fa\u4e8e MVCC \u5b9e\u73b0\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u8fc7\uff0c SERIALIZABLE \u4e4b\u5916\u7684\u5176\u4ed6\u9694\u79bb\u7ea7\u522b\u53ef\u80fd\u4e5f\u9700\u8981\u7528\u5230\u9501\u673a\u5236\uff0c\u5c31\u6bd4\u5982 REPEATABLE-READ \u5728\u5f53\u524d\u8bfb\u60c5\u51b5\u4e0b\u9700\u8981\u4f7f\u7528\u52a0\u9501\u8bfb\u6765\u4fdd\u8bc1\u4e0d\u4f1a\u51fa\u73b0\u5e7b\u8bfb\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5e76\u53d1\u5e26\u6765\u7684\u95ee\u9898 \u4e0d\u53ef\u91cd\u590d\u8bfb\u548c\u5e7b\u8bfb\u6709\u4ec0\u4e48\u533a\u522b\u5462\uff1f \u9694\u79bb\u7ea7\u522b \u9694\u79bb\u5b9e\u73b0\u65b9\u5f0f MySQL \u7684\u9694\u79bb\u7ea7\u522b\u57fa\u4e8e\u9501\u548c MVC [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[29,33],"class_list":["post-64","post","type-post","status-publish","format-standard","hentry","category-mysql","tag-mysql","tag-33"],"_links":{"self":[{"href":"https:\/\/blessingcr.com\/index.php?rest_route=\/wp\/v2\/posts\/64","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blessingcr.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blessingcr.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blessingcr.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blessingcr.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=64"}],"version-history":[{"count":1,"href":"https:\/\/blessingcr.com\/index.php?rest_route=\/wp\/v2\/posts\/64\/revisions"}],"predecessor-version":[{"id":65,"href":"https:\/\/blessingcr.com\/index.php?rest_route=\/wp\/v2\/posts\/64\/revisions\/65"}],"wp:attachment":[{"href":"https:\/\/blessingcr.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=64"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blessingcr.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=64"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blessingcr.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=64"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}