{"id":313175,"date":"2021-01-17T06:29:07","date_gmt":"2021-01-16T22:29:07","guid":{"rendered":"http:\/\/4563.org\/?p=313175"},"modified":"2021-01-17T06:29:07","modified_gmt":"2021-01-16T22:29:07","slug":"%e5%a4%a7%e5%ae%b6%e4%bc%81%e4%b8%9a%e5%ae%9e%e9%99%85%e7%94%9f%e4%ba%a7%e4%b8%ad%e6%95%b0%e6%8d%ae%e5%ba%93%e9%83%bd%e5%a6%82%e4%bd%95%e9%85%8d%e7%bd%ae%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=313175","title":{"rendered":"\u5927\u5bb6\u4f01\u4e1a\u5b9e\u9645\u751f\u4ea7\u4e2d\u6570\u636e\u5e93\u90fd\u5982\u4f55\u914d\u7f6e\uff1f"},"content":{"rendered":"
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\u5927\u5bb6\u4f01\u4e1a\u5b9e\u9645\u751f\u4ea7\u4e2d\u6570\u636e\u5e93\u90fd\u5982\u4f55\u914d\u7f6e\uff1f <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : RedBlackTree <\/span> <\/i> 2<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
\u662f\u5426 autocommit\uff0c\u9694\u79bb\u7ea7\u522b\u662f Read Uncommit \u8fd8\u662f Repeatable Read \uff1f
\u4e0a\u6b21\u53bb\u9762\u8bd5\u4eba\u5bb6\u95ee\u6211\uff0c\u8bf4\u9694\u79bb\u7ea7\u522b\uff0c\u6211\u5c31\u8bf4\u4e86\u81ea\u5df1\u7406\u89e3\u7684 RR\uff0cselect \u8fc7\u7a0b\u52a0\u8bfb\u9501\uff0c\u5176\u4ed6\u4e8b\u52a1\u6ca1\u6cd5\u52a0\u5199\u9501\uff0c\u907f\u514d\u5176\u4ed6\u4e8b\u52a1\u4fee\u6539\u6211\u4eec select \u7684\u8bb0\u5f55\u3002\u5bf9\u9762\u5c31\u7b11\u4e86\uff1a\u5355\u5355 select \u5c31\u4f1a\u52a0\u9501\u5417\uff1f\u4f60\u786e\u5b9a\uff1f\u6211\u8bf4\u7406\u8bba\u4e0a\u662f\u8fd9\u6837\u7684\uff0c\u5b9e\u9645\u4e2d Innodb \u901a\u8fc7 MVCC \u6765\u907f\u514d\u52a0\u9501\u3002
\u7136\u540e\u5c31\u662f\u4e00\u6bb5\u65f6\u95f4\u7684\u4e89\u6267\uff0c\u5bf9\u65b9\u8ba4\u4e3a select \u4e0d\u4f1a\u52a0\u9501\uff0c\u6211\u4e5f\u5c31\u91cd\u590d\u81ea\u5df1\u7684\u89c2\u70b9\u3002
\u7136\u540e\u5bf9\u65b9\u95ee\u6211\u4e4b\u524d\u516c\u53f8\u7528\u7684\u9694\u79bb\u7ea7\u522b\u662f\u4ec0\u4e48\uff0c\u6211\u8bf4\u9ed8\u8ba4\u7684 RR \u3002\u95ee\u5230\u5e7b\u8bfb\uff0c\u8bf4\u4f60\u4eec\u662f\u600e\u4e48\u89e3\u51b3\u5e7b\u8bfb\u7684\u3002\u6211\u5c31\u5361\u58f3\u4e86\uff0c\u6ca1\u9047\u5230\u8fc7\u554a\uff0cInnodb \u4e0d\u662f\u4e0d\u4f1a\u5e7b\u8bfb\u5417\u3002\u6700\u540e\u9a74\u5507\u4e0d\u5bf9\u9a6c\u5634\u5730\u626f\u4e86\u534a\u5929\uff0c\u8bf4\u53ef\u4ee5\u501f\u9274 MVCC \u81ea\u5df1\u6dfb\u52a0\u7248\u672c\u5b57\u6bb5\uff0c\u5404\u4e2a\u4e8b\u52a1\u53ea\u64cd\u4f5c\u81ea\u5df1\u7248\u672c\u7684\u8bb0\u5f55\u3002\u6700\u540e\u624d\u660e\u767d\u5bf9\u65b9\u60f3\u5f97\u5230 select for update \u7684\u7b54\u6848\u3002
\u540e\u6765\u53c8\u7ffb\u4e86\u6280\u672f\u5185\u5e55\u90a3\u672c\u4e66\uff0c\u624d\u53d1\u73b0 innodb \u5728 RR \u7ea7\u522b\u4e0b\u624d\u4f1a\u7528 Next-key lock \u89e3\u51b3\u5e7b\u8bfb\uff0c\u800c RC \u7ea7\u522b\u4e0b\u53ea\u6709\u884c\u9501\uff0c\u6240\u4ee5\u4f1a\u6709\u5e7b\u8bfb\u3002
\u81ea\u5df1\u786e\u5b9e\u7f3a\u5c11\u5b9e\u64cd\u7ecf\u9a8c\uff0c\u6240\u4ee5\u60f3\u95ee\u95ee\u5927\u5bb6\u5b9e\u9645\u751f\u4ea7\u73af\u5883\u4e2d\u6570\u636e\u5e93\u600e\u4e48\u8bbe\u7f6e\u7684\u3002 <\/div>\n
\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (3<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
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  • \n
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    \u8cc7\u6df1\u5927\u4f6c : xuanbg <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u9ed8\u8ba4\u914d\u7f6e <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
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    \n
    \u8cc7\u6df1\u5927\u4f6c : louettagfh <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    1. select \u662f\u5426\u52a0\u9501\u8981\u770b\u662f\u4ec0\u4e48\u7c7b\u578b\u7684 select \u8bed\u53e5:
    * \u5feb\u7167\u8bfb\u4e0d\u9700\u8981\u52a0\u9501, MVCC \u7684 undo log \u80fd\u4fdd\u8bc1\u8bfb\u5230\u6b63\u786e\u7684\u6570\u636e.
    * shard mode \u52a0 s \u9501.
    * for update \u52a0 x \u9501.<\/p>\n

    2. InnoDB \u4f7f\u7528 Next-key Lock \u89e3\u51b3\u4e86 RR \u90e8\u5206\u573a\u666f\u4e0b\u7684\u5e7b\u8bfb\uff0c\u4e5f\u4e0d\u662f\u5b8c\u5168\u7684\u907f\u514d\u5e7b\u8bfb. <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
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    \u8cc7\u6df1\u5927\u4f6c : yzbythesea <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6709\u4e00\u8bf4\u4e00\u8fd8\u662f nosql \u7b80\u5355\u3002sql \u8fd9\u79cd\u5c31\u5e94\u8be5\u5728\u751f\u4ea7\u670d\u52a1\u4e0a\u6dd8\u6c70\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"

    \u5927\u5bb6\u4f01\u4e1a\u5b9e\u9645\u751f\u4ea7\u4e2d\u6570\u636e\u5e93\u90fd\u5982\u4f55\u914d\u7f6e…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/313175"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=313175"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/313175\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=313175"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=313175"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=313175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}