{"id":326746,"date":"2021-02-07T19:16:59","date_gmt":"2021-02-07T11:16:59","guid":{"rendered":"http:\/\/4563.org\/?p=326746"},"modified":"2021-02-07T19:16:59","modified_gmt":"2021-02-07T11:16:59","slug":"innodb-rr-%e9%9a%94%e7%a6%bb%e7%ba%a7%e5%88%ab%e4%b8%8b%e7%9a%84%e5%b0%8f%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=326746","title":{"rendered":"innodb RR \u9694\u79bb\u7ea7\u522b\u4e0b\u7684\u5c0f\u95ee\u9898"},"content":{"rendered":"
\n
\n
\n

innodb RR \u9694\u79bb\u7ea7\u522b\u4e0b\u7684\u5c0f\u95ee\u9898 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : whatevers <\/span> <\/i> 0<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

1 \u3001read_view \u4e2d\u7ef4\u62a4\u4e86\u7cfb\u7edf\u4e2d\u6d3b\u8dc3\u4e8b\u52a1\u96c6\u5408\u7684\u5feb\u7167\uff0c\u8fd9\u4e9b\u6d3b\u8dc3\u4e8b\u52a1 ID \u7684\u6700\u5c0f\u503c\u4e3a up_limit_id\uff0c\u6700\u5927\u503c\u4e3a low_limit_id \uff1b SELECT \u64cd\u4f5c\u8fd4\u56de\u7ed3\u679c\u7684\u53ef\u89c1\u6027\u662f\u7531\u4ee5\u4e0b\u89c4\u5219\u51b3\u5b9a\u7684\uff1a<\/p>\n

DB_TRX_ID < up_limit_id  -> \u6b64\u8bb0\u5f55\u7684\u6700\u540e\u4e00\u6b21\u4fee\u6539\u5728 read_view \u521b\u5efa\u4e4b\u524d\uff0c\u53ef\u89c1  DB_TRX_ID > low_limit_id   -> \u6b64\u8bb0\u5f55\u7684\u6700\u540e\u4e00\u6b21\u4fee\u6539\u5728 read_view \u521b\u5efa\u4e4b\u540e\uff0c\u4e0d\u53ef\u89c1  ->  \u9700\u8981\u7528 DB_ROLL_PTR \u67e5\u627e undo log(\u6b64\u8bb0\u5f55\u7684\u4e0a\u4e00\u6b21\u4fee\u6539)\uff0c\u7136\u540e\u6839\u636e undo log \u7684 DB_TRX_ID \u518d\u8ba1\u7b97\u4e00\u6b21\u53ef\u89c1\u6027  up_limit_id <= DB_TRX_ID <= low_limit_id -> \u9700\u8981\u8fdb\u4e00\u6b65\u68c0\u67e5 read_view \u4e2d\u662f\u5426\u542b\u6709 DB_TRX_ID  DB_TRX_ID \u2209 read_view  -> \u6b64\u8bb0\u5f55\u7684\u6700\u540e\u4e00\u6b21\u4fee\u6539\u5728 read_view \u521b\u5efa\u4e4b\u524d\uff0c\u53ef\u89c1  DB_TRX_ID \u2208 read_view -> \u6b64\u8bb0\u5f55\u7684\u6700\u540e\u4e00\u6b21\u4fee\u6539\u5728 read_view \u521b\u5efa\u65f6\u5c1a\u672a\u4fdd\u5b58\uff0c\u4e0d\u53ef\u89c1  -> \u9700\u8981\u7528 DB_ROLL_PTR \u67e5\u627e undo log(\u6b64\u8bb0\u5f55\u7684\u4e0a\u4e00\u6b21\u4fee\u6539)\uff0c\u7136\u540e\u6839\u636e undo log \u7684 DB_TRX_ID \u518d\u4ece\u5934\u8ba1\u7b97\u4e00\u6b21\u53ef\u89c1\u6027 <\/code><\/pre>\n
2 \u3001RR \u9694\u79bb\u7ea7\u522b\u4e0b\uff1aread view \u662f\u5728 first touch read \u65f6\u521b\u5efa\u7684\uff0c\u4e5f\u5c31\u662f\u6267\u884c\u4e8b\u52a1\u4e2d\u7684\u7b2c\u4e00\u6761 SELECT \u8bed\u53e5\u7684\u77ac\u95f4\uff0c\u540e\u7eed\u6240\u6709\u7684 SELECT \u90fd\u662f\u590d\u7528\u8fd9\u4e2a read view\uff0c\u6240\u4ee5\u80fd\u4fdd\u8bc1\u6bcf\u6b21\u8bfb\u53d6\u7684\u4e00\u81f4\u6027\uff08\u53ef\u91cd\u590d\u8bfb\u7684\u8bed\u4e49\uff09<\/p>\n
\u6309\u7167\u8fd9\u4e2a\u8bf4\u6cd5\uff0cRR \u9694\u79bb\u7ea7\u522b\u4e0b\u662f\u8bfb\u53d6\u4e0d\u5230\u5176\u4ed6\u4e8b\u52a1\u63d2\u5165\u7684\u6570\u636e\u7684\uff0c\u90a3\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981 next-key lock \u7b97\u6cd5\u52a0\u9501\u6765\u963b\u6b62\u5176\u4ed6\u4e8b\u52a1\u7684\u63d2\u5165\u5462<\/p>\n
\u6c42\u5927\u4f6c\u89e3\u60d1<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (9<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : XiLemon <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 mvcc \u53ef\u4ee5\u89e3\u51b3\u5feb\u7167\u8bfb\u7684\u5e7b\u8bfb\uff0c\u5f53\u524d\u8bfb\u8fd8\u662f\u8981\u7528 Next-key lock \u5427                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : radiocontroller <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 RR \u9694\u79bb\u7ea7\u522b\u4e0b\u662f\u8bfb\u53d6\u4e0d\u5230\u5176\u4ed6\u4e8b\u52a1\u63d2\u5165\u7684\u6570\u636e\u7684                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : radiocontroller <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @radiocontroller RR \u9694\u79bb\u7ea7\u522b\u4e0b\u662f\u8bfb\u53d6\u4e0d\u5230\u5176\u4ed6\u4e8b\u52a1\u63d2\u5165\u7684\u6570\u636e\u7684\uff0c\u8fd9\u91cc\u662f\u5feb\u7167\u8bfb\u3002\u90a3\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981 next-key lock \u7b97\u6cd5\u52a0\u9501\u6765\u963b\u6b62\u5176\u4ed6\u4e8b\u52a1\u7684\u63d2\u5165\u5462\uff0c\u8fd9\u91cc\u662f\u5f53\u524d\u8bfb                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : bringyou <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6211\u611f\u89c9\u662f\u4e3a\u4e86\u89e3\u51b3\u5e7b\u8bfb                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : xixihaha1 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 mvcc \u53ef\u4ee5\u89e3\u51b3\u201c\u5feb\u7167\u8bfb\u201d\u7684\u5e7b\u8bfb\u95ee\u9898\uff0c\u4f46\u662f\u89e3\u51b3\u4e0d\u4e86\u201c\u5f53\u524d\u8bfb\u201d\u7684\u5e7b\u8bfb\u95ee\u9898                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : whatevers <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @XiLemon @radiocontroller \u604d\u7136\u5927\u609f\uff0c\u5ffd\u7565\u4e86\u8bfb\u7684\u4e0a\u4e0b\u6587\uff0c\u591a\u8c22\u4e24\u4f4d\u5927\u4f6c                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : awanganddong <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5907\u6ce8\u4e0b\uff1a<\/p>\n
    \u5f53\u524d\u8bfb
     \u5f53\u524d\u8bfb\u662f\u57fa\u4e8e \u4e34\u952e\u9501\uff08\u884c\u9501 + \u95f4\u6b47\u9501\uff09\u6765\u5b9e\u73b0\u7684\uff0c\u9002\u7528\u4e8e insert\uff0cupdate\uff0cdelete\uff0cselect … for update\uff0cselect … lock in share mode \u8bed\u53e5\uff0c\u4ee5\u53ca\u52a0\u9501\u4e86\u7684 select \u8bed\u53e5\u3002<\/p>\n
     \u66f4\u65b0\u6570\u636e\u65f6\uff0c\u90fd\u662f\u5148\u8bfb\u540e\u5199\uff0c\u800c\u8fd9\u4e2a\u8bfb\uff0c\u5c31\u662f\u5f53\u524d\u8bfb\u3002\u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u8bfb\u53d6\u8be5\u6761\u6570\u636e\u7684\u5df2\u7ecf\u63d0\u4ea4\u7684\u6700\u65b0\u7684\u4e8b\u52a1\uff0c\u751f\u6210\u7684 readView \u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : YouLMAO <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 like share and Subscribe                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : zzkde <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 low_limit_id \u6307\u7684\u4e0d\u662f\u7cfb\u7edf\u4e2d\u6d3b\u8dc3\u4e8b\u52a1\u7684\u6700\u5927 ID\uff0c\u5e94\u8be5\u662f\u7cfb\u7edf\u8981\u751f\u6210\u7684\u4e0b\u4e00\u4e2a\u4e8b\u52a1 ID \u3002\u53ef\u4ee5\u8bd5\u60f3\u8fd9\u79cd\u60c5\u51b5\uff1aReadView \u521b\u5efa\u65f6\uff0c\u7cfb\u7edf\u4e2d\u6d3b\u8dc3\u7684\u6700\u5927\u4e8b\u52a1 ID \u53ef\u80fd\u5df2\u7ecf\u5b58\u5728\u5f88\u4e45\u4e86\uff0c\u8fd9\u671f\u95f4\u4e5f\u4f1a\u63d0\u4ea4\u4e8b\u52a1\uff08\u5728 ReadView \u521b\u5efa\u65f6\u5c31\u5df2\u63d0\u4ea4\uff09\uff0c\u8fd9\u4e9b\u63d0\u4ea4\u4e86\u7684\u4e8b\u52a1\u5e94\u8be5\u662f\u53ef\u89c1\u7684\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    innodb RR \u9694\u79bb\u7ea7\u522b\u4e0b\u7684\u5c0f…<\/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\/326746"}],"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=326746"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/326746\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=326746"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=326746"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=326746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}