{"id":1833,"date":"2022-11-27T23:28:32","date_gmt":"2022-11-27T15:28:32","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1833"},"modified":"2023-01-05T18:06:13","modified_gmt":"2023-01-05T10:06:13","slug":"%e4%ba%8b%e5%8a%a1%e7%9a%84acid%e5%b1%9e%e6%80%a7%e5%8f%8a4%e7%a7%8d%e9%9a%94%e7%a6%bb%e7%ba%a7%e5%88%ab","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1833","title":{"rendered":"\u4e8b\u52a1\u7684ACID\u5c5e\u6027\u53ca4\u79cd\u9694\u79bb\u7ea7\u522b"},"content":{"rendered":"\n

6.3 \u4e8b\u52a1\u7684ACID\u5c5e\u6027<\/h3>\n\n\n\n
    \n
  1. \u539f\u5b50\u6027\uff08Atomicity\uff09<\/strong> \u539f\u5b50\u6027\u662f\u6307\u4e8b\u52a1\u662f\u4e00\u4e2a\u4e0d\u53ef\u5206\u5272\u7684\u5de5\u4f5c\u5355\u4f4d\uff0c\u4e8b\u52a1\u4e2d\u7684\u64cd\u4f5c\u8981\u4e48\u90fd\u53d1\u751f\uff0c\u8981\u4e48\u90fd\u4e0d\u53d1\u751f\u3002<\/li>\n\n\n\n
  2. \u4e00\u81f4\u6027\uff08Consistency\uff09<\/strong> \u4e8b\u52a1\u5fc5\u987b\u4f7f\u6570\u636e\u5e93\u4ece\u4e00\u4e2a\u4e00\u81f4\u6027\u72b6\u6001\u53d8\u6362\u5230\u53e6\u5916\u4e00\u4e2a\u4e00\u81f4\u6027\u72b6\u6001\u3002<\/li>\n\n\n\n
  3. \u9694\u79bb\u6027\uff08Isolation\uff09<\/strong> \u4e8b\u52a1\u7684\u9694\u79bb\u6027\u662f\u6307\u4e00\u4e2a\u4e8b\u52a1\u7684\u6267\u884c\u4e0d\u80fd\u88ab\u5176\u4ed6\u4e8b\u52a1\u5e72\u6270\uff0c\u5373\u4e00\u4e2a\u4e8b\u52a1\u5185\u90e8\u7684\u64cd\u4f5c\u53ca\u4f7f\u7528\u7684\u6570\u636e\u5bf9\u5e76\u53d1\u7684\u5176\u4ed6\u4e8b\u52a1\u662f\u9694\u79bb\u7684\uff0c\u5e76\u53d1\u6267\u884c\u7684\u5404\u4e2a\u4e8b\u52a1\u4e4b\u95f4\u4e0d\u80fd\u4e92\u76f8\u5e72\u6270\u3002<\/li>\n\n\n\n
  4. \u6301\u4e45\u6027\uff08Durability\uff09<\/strong> \u6301\u4e45\u6027\u662f\u6307\u4e00\u4e2a\u4e8b\u52a1\u4e00\u65e6\u88ab\u63d0\u4ea4\uff0c\u5b83\u5bf9\u6570\u636e\u5e93\u4e2d\u6570\u636e\u7684\u6539\u53d8\u5c31\u662f\u6c38\u4e45\u6027\u7684\uff0c\u63a5\u4e0b\u6765\u7684\u5176\u4ed6\u64cd\u4f5c\u548c\u6570\u636e\u5e93\u6545\u969c\u4e0d\u5e94\u8be5\u5bf9\u5176\u6709\u4efb\u4f55\u5f71\u54cd\u3002<\/li>\n<\/ol>\n\n\n\n

    6.3.1 \u6570\u636e\u5e93\u7684\u5e76\u53d1\u95ee\u9898<\/h4>\n\n\n\n
      \n
    • \u5bf9\u4e8e\u540c\u65f6\u8fd0\u884c\u7684\u591a\u4e2a\u4e8b\u52a1, \u5f53\u8fd9\u4e9b\u4e8b\u52a1\u8bbf\u95ee\u6570\u636e\u5e93\u4e2d\u76f8\u540c\u7684\u6570\u636e\u65f6, \u5982\u679c\u6ca1\u6709\u91c7\u53d6\u5fc5\u8981\u7684\u9694\u79bb\u673a\u5236, \u5c31\u4f1a\u5bfc\u81f4\u5404\u79cd\u5e76\u53d1\u95ee\u9898:\n
        \n
      • \u810f\u8bfb<\/strong>: \u5bf9\u4e8e\u4e24\u4e2a\u4e8b\u52a1 T1, T2, T1 \u8bfb\u53d6\u4e86\u5df2\u7ecf\u88ab T2 \u66f4\u65b0\u4f46\u8fd8\u6ca1\u6709\u88ab\u63d0\u4ea4<\/strong>\u7684\u5b57\u6bb5\u3002\u4e4b\u540e, \u82e5 T2 \u56de\u6eda, T1\u8bfb\u53d6\u7684\u5185\u5bb9\u5c31\u662f\u4e34\u65f6\u4e14\u65e0\u6548\u7684\u3002<\/li>\n\n\n\n
      • \u4e0d\u53ef\u91cd\u590d\u8bfb<\/strong>: \u5bf9\u4e8e\u4e24\u4e2a\u4e8b\u52a1T1, T2, T1 \u8bfb\u53d6\u4e86\u4e00\u4e2a\u5b57\u6bb5, \u7136\u540e T2 \u66f4\u65b0<\/strong>\u4e86\u8be5\u5b57\u6bb5\u3002\u4e4b\u540e, T1\u518d\u6b21\u8bfb\u53d6\u540c\u4e00\u4e2a\u5b57\u6bb5, \u503c\u5c31\u4e0d\u540c\u4e86\u3002<\/li>\n\n\n\n
      • \u5e7b\u8bfb<\/strong>: \u5bf9\u4e8e\u4e24\u4e2a\u4e8b\u52a1T1, T2, T1 \u4ece\u4e00\u4e2a\u8868\u4e2d\u8bfb\u53d6\u4e86\u4e00\u4e2a\u5b57\u6bb5, \u7136\u540e T2 \u5728\u8be5\u8868\u4e2d\u63d2\u5165<\/strong>\u4e86\u4e00\u4e9b\u65b0\u7684\u884c\u3002\u4e4b\u540e, \u5982\u679c T1 \u518d\u6b21\u8bfb\u53d6\u540c\u4e00\u4e2a\u8868, \u5c31\u4f1a\u591a\u51fa\u51e0\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n
      • \u6570\u636e\u5e93\u4e8b\u52a1\u7684\u9694\u79bb\u6027<\/strong>: \u6570\u636e\u5e93\u7cfb\u7edf\u5fc5\u987b\u5177\u6709\u9694\u79bb\u5e76\u53d1\u8fd0\u884c\u5404\u4e2a\u4e8b\u52a1\u7684\u80fd\u529b, \u4f7f\u5b83\u4eec\u4e0d\u4f1a\u76f8\u4e92\u5f71\u54cd, \u907f\u514d\u5404\u79cd\u5e76\u53d1\u95ee\u9898\u3002<\/li>\n\n\n\n
      • \u4e00\u4e2a\u4e8b\u52a1\u4e0e\u5176\u4ed6\u4e8b\u52a1\u9694\u79bb\u7684\u7a0b\u5ea6\u79f0\u4e3a\u9694\u79bb\u7ea7\u522b\u3002\u6570\u636e\u5e93\u89c4\u5b9a\u4e86\u591a\u79cd\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b, \u4e0d\u540c\u9694\u79bb\u7ea7\u522b\u5bf9\u5e94\u4e0d\u540c\u7684\u5e72\u6270\u7a0b\u5ea6, \u9694\u79bb\u7ea7\u522b\u8d8a\u9ad8, \u6570\u636e\u4e00\u81f4\u6027\u5c31\u8d8a\u597d, \u4f46\u5e76\u53d1\u6027\u8d8a\u5f31\u3002<\/strong><\/li>\n<\/ul>\n\n\n\n

        6.3.2 \u56db\u79cd\u9694\u79bb\u7ea7\u522b<\/h4>\n\n\n\n
          \n
        • \u6570\u636e\u5e93\u63d0\u4f9b\u76844\u79cd\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff1a<\/li>\n<\/ul>\n\n\n\n
          \"\"<\/div><\/figure>\n\n\n\n
            \n
          • Oracle \u652f\u6301\u7684 2 \u79cd\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff1aREAD COMMITED<\/strong>, SERIALIZABLE\u3002 Oracle \u9ed8\u8ba4\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u4e3a: READ COMMITED<\/strong> \u3002<\/li>\n\n\n\n
          • Mysql \u652f\u6301 4 \u79cd\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u3002Mysql \u9ed8\u8ba4\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u4e3a: REPEATABLE READ\u3002<\/strong><\/li>\n<\/ul>\n\n\n\n

            6.3.3 \u5728MySql\u4e2d\u8bbe\u7f6e\u9694\u79bb\u7ea7\u522b<\/h4>\n\n\n\n
              \n
            • \u6bcf\u542f\u52a8\u4e00\u4e2a mysql \u7a0b\u5e8f, \u5c31\u4f1a\u83b7\u5f97\u4e00\u4e2a\u5355\u72ec\u7684\u6570\u636e\u5e93\u8fde\u63a5. \u6bcf\u4e2a\u6570\u636e\u5e93\u8fde\u63a5\u90fd\u6709\u4e00\u4e2a\u5168\u5c40\u53d8\u91cf @@tx_isolation, \u8868\u793a\u5f53\u524d\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u3002<\/li>\n\n\n\n
            • \u67e5\u770b\u5f53\u524d\u7684\u9694\u79bb\u7ea7\u522b:<\/li>\n<\/ul>\n\n\n\n
              SELECT @@tx_isolation;<\/code><\/pre>\n\n\n\n
                \n
              • \u8bbe\u7f6e\u5f53\u524d mySQL \u8fde\u63a5\u7684\u9694\u79bb\u7ea7\u522b:set transaction isolation level read committed;<\/code><\/li>\n<\/ul>\n\n\n\n
                set  transaction isolation level read committed;<\/code><\/pre>\n\n\n\n
                  \n
                • \u8bbe\u7f6e\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u5168\u5c40\u7684\u9694\u79bb\u7ea7\u522b:set global transaction isolation level read committed;<\/code><\/li>\n<\/ul>\n\n\n\n
                  set global transaction isolation level read committed;<\/code><\/pre>\n\n\n\n
                    \n
                  • \u8865\u5145\u64cd\u4f5c\uff1a\n
                      \n
                    • \u521b\u5efamysql\u6570\u636e\u5e93\u7528\u6237\uff1acreate user tom identified by 'abc123';<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
                      create user tom identified by 'abc123';<\/code><\/pre>\n\n\n\n
                        \n
                      • \u6388\u4e88\u6743\u9650<\/li>\n<\/ul>\n\n\n\n
                        #\u6388\u4e88\u901a\u8fc7\u7f51\u7edc\u65b9\u5f0f\u767b\u5f55\u7684tom\u7528\u6237\uff0c\u5bf9\u6240\u6709\u5e93\u6240\u6709\u8868\u7684\u5168\u90e8\u6743\u9650\uff0c\u5bc6\u7801\u8bbe\u4e3aabc123.\ngrant all privileges on *.* to tom@'%'  identified by 'abc123'; \n\n #\u7ed9tom\u7528\u6237\u4f7f\u7528\u672c\u5730\u547d\u4ee4\u884c\u65b9\u5f0f\uff0c\u6388\u4e88qaqaqdb\u8fd9\u4e2a\u5e93\u4e0b\u7684\u6240\u6709\u8868\u7684\u63d2\u5220\u6539\u67e5\u7684\u6743\u9650\u3002\ngrant select,insert,delete,update on qaqaqdb.* to tom@localhost identified by 'abc123'; \n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
                        6.3 \u4e8b\u52a1\u7684ACID\u5c5e\u6027 6.3.1 \u6570\u636e\u5e93\u7684\u5e76\u53d1\u95ee\u9898 6.3.2 \u56db\u79cd\u9694\u79bb\u7ea7\u522b 6.3.3 \u5728MySql\u4e2d […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[48],"class_list":["post-1833","post","type-post","status-publish","format-standard","hentry","category-jdbc-code","tag-jdbc"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1833"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1833"}],"version-history":[{"count":2,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1833\/revisions"}],"predecessor-version":[{"id":3250,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1833\/revisions\/3250"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1833"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1833"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1833"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}