SET Transaction Isolation Level Read UNCOMMITTED<\/p>\n
\u4f7f\u7528\u8fd9\u53e5\u4e1c\u4e1c\u5462\u53ef\u4ee5\u5206\u4e3a\u56db\u79cd\u60c5\u51b5\uff0c\u73b0\u5728\u5c31\u5728\u8fd9\u91cc\u9010\u4e00\u4ecb\u7ecd\uff1a<\/p>\n
\u7b2c\u4e00\u79cd\u60c5\u51b5\uff1a<\/p>\n
READ COMMITTED<\/p>\n
\u8fd9\u53e5\u7684\u4f5c\u7528\u662f\uff1a<\/p>\n
\u6307\u5b9a\u5728\u8bfb\u53d6\u6570\u636e\u65f6\u63a7\u5236\u5171\u4eab\u9501\u4ee5\u907f\u514d\u810f\u8bfb\uff0c\u4f46\u6570\u636e\u53ef\u5728\u4e8b\u52a1\u7ed3\u675f\u524d\u66f4\u6539\uff0c\u4ece\u800c\u4ea7\u751f\u4e0d\u53ef\u91cd\u590d\u8bfb\u53d6\u6216\u5e7b\u50cf\u6570\u636e\u3002\u8be5\u9009\u9879\u662f SQL Server \u7684\u9ed8\u8ba4\u503c\u3002<\/p>\n
\u7b2c\u4e8c\u79cd\u60c5\u51b5\uff1a<\/p>\n
READ UNCOMMITTED<\/p>\n
\u8fd9\u53e5\u7684\u4f5c\u7528\u662f\uff1a<\/p>\n
\u6267\u884c\u810f\u8bfb\u62160\u7ea7\u9694\u79bb\u9501\u5b9a\uff0c\u8fd9\u8868\u793a\u4e0d\u53d1\u51fa\u5171\u4eab\u9501\uff0c\u4e5f\u4e0d\u63a5\u53d7\u6392\u5b83\u9501\u3002\u5f53\u8bbe\u7f6e\u8be5\u9009\u9879\u65f6\uff0c\u53ef\u4ee5\u5bf9\u6570\u636e\u6267\u884c\u672a\u63d0\u4ea4\u8bfb\u6216\u810f\u8bfb\uff1b\u5728\u4e8b\u52a1\u7ed3\u675f\u524d\u53ef\u4ee5\u66f4\u6539\u6570\u636e\u5185\u7684\u6570\u503c\uff0c\u884c\u4e5f\u53ef\u4ee5\u51fa\u73b0\u5728\u6570\u636e\u96c6\u4e2d\u6216\u4ece\u6570\u636e\u96c6\u6d88\u5931\u3002\u8be5\u9009\u9879\u7684\u4f5c\u7528\u4e0e\u5728\u4e8b\u52a1\u5185\u6240\u6709\u8bed\u53e5\u4e2d\u7684\u6240\u6709\u8868\u4e0a\u8bbe\u7f6e NOLOCK \u76f8\u540c\u3002\u8fd9\u662f\u56db\u4e2a\u9694\u79bb\u7ea7\u522b\u4e2d\u9650\u5236\u6700\u5c0f\u7684\u7ea7\u522b\u3002<\/p>\n
\u7b2c\u4e09\u79cd\u60c5\u51b5\uff1a<\/p>\n
REPEATABLE READ<\/p>\n
\u8fd9\u53e5\u7684\u4f5c\u7528\u662f\uff1a<\/p>\n
\u9501\u5b9a\u67e5\u8be2\u4e2d\u4f7f\u7528\u7684\u6240\u6709\u6570\u636e\u4ee5\u9632\u6b62\u5176\u4ed6\u7528\u6237\u66f4\u65b0\u6570\u636e\uff0c\u4f46\u662f\u5176\u4ed6\u7528\u6237\u53ef\u4ee5\u5c06\u65b0\u7684\u5e7b\u50cf\u884c\u63d2\u5165\u6570\u636e\u96c6\uff0c\u4e14\u5e7b\u50cf\u884c\u5305\u62ec\u5728\u5f53\u524d\u4e8b\u52a1\u7684\u540e\u7eed\u8bfb\u53d6\u4e2d\u3002\u56e0\u4e3a\u5e76\u53d1\u4f4e\u4e8e\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\uff0c\u6240\u4ee5\u5e94\u53ea\u5728\u5fc5\u8981\u65f6\u624d\u4f7f\u7528\u8be5\u9009\u9879\u3002<\/p>\n
\u7b2c\u56db\u79cd\u60c5\u51b5\uff1a<\/p>\n
SERIALIZABLE<\/p>\n
\u8fd9\u53e5\u7684\u4f5c\u7528\u662f\uff1a<\/p>\n
\u5728\u6570\u636e\u96c6\u4e0a\u653e\u7f6e\u4e00\u4e2a\u8303\u56f4\u9501\uff0c\u4ee5\u9632\u6b62\u5176\u4ed6\u7528\u6237\u5728\u4e8b\u52a1\u5b8c\u6210\u4e4b\u524d\u66f4\u65b0\u6570\u636e\u96c6\u6216\u5c06\u884c\u63d2\u5165\u6570\u636e\u96c6\u5185\u3002\u8fd9\u662f\u56db\u4e2a\u9694\u79bb\u7ea7\u522b\u4e2d\u9650\u5236\u6700\u5927\u7684\u7ea7\u522b\u3002\u56e0\u4e3a\u5e76\u53d1\u7ea7\u522b\u8f83\u4f4e\uff0c\u6240\u4ee5\u5e94\u53ea\u5728\u5fc5\u8981\u65f6\u624d\u4f7f\u7528\u8be5\u9009\u9879\u3002\u8be5\u9009\u9879\u7684\u4f5c\u7528\u4e0e\u5728\u4e8b\u52a1\u5185\u6240\u6709 SELECT \u8bed\u53e5\u4e2d\u7684\u6240\u6709\u8868\u4e0a\u8bbe\u7f6e HOLDLOCK \u76f8\u540c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
SET Transaction Isolation Level Read UNCOMMITTED\uff0c\u4f7f\u7528\u8fd9\u53e5\u4e1c\u4e1c\u5462\u53ef\u4ee5\u5206\u4e3a\u56db\u79cd\u60c5\u51b5\uff0c\u73b0\u5728\u5c31\u5728\u8fd9\u91cc\u9010\u4e00\u4ecb\u7ecd\u3002<\/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":[45,44,46],"class_list":["post-578","post","type-post","status-publish","format-standard","hentry","category-sql-server","tag-server","tag-sql","tag-46","cat-11-id"],"_links":{"self":[{"href":"https:\/\/vcoo.cc\/blog\/wp-json\/wp\/v2\/posts\/578","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vcoo.cc\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vcoo.cc\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vcoo.cc\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vcoo.cc\/blog\/wp-json\/wp\/v2\/comments?post=578"}],"version-history":[{"count":0,"href":"https:\/\/vcoo.cc\/blog\/wp-json\/wp\/v2\/posts\/578\/revisions"}],"wp:attachment":[{"href":"https:\/\/vcoo.cc\/blog\/wp-json\/wp\/v2\/media?parent=578"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vcoo.cc\/blog\/wp-json\/wp\/v2\/categories?post=578"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vcoo.cc\/blog\/wp-json\/wp\/v2\/tags?post=578"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}