{"id":6842,"date":"2025-08-27T11:13:58","date_gmt":"2025-08-27T03:13:58","guid":{"rendered":"https:\/\/t.n-years.com\/?p=6842"},"modified":"2025-08-27T11:13:58","modified_gmt":"2025-08-27T03:13:58","slug":"mysql-%e7%9a%84-mvcc%ef%bc%88multi-version-concurrency-control%ef%bc%8c%e5%a4%9a%e7%89%88%e6%9c%ac%e5%b9%b6%e5%8f%91%e6%8e%a7%e5%88%b6%ef%bc%89","status":"publish","type":"post","link":"https:\/\/t.n-years.com\/?p=6842","title":{"rendered":"MySQL \u7684 MVCC\uff08Multi-Version Concurrency Control\uff0c\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff09"},"content":{"rendered":"<p>MySQL \u7684 MVCC\uff08Multi-Version Concurrency Control\uff0c\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff09\u662f InnoDB \u5b58\u50a8\u5f15\u64ce\u5b9e\u73b0\u9694\u79bb\u7ea7\u522b\u7684\u6838\u5fc3\u673a\u5236\uff0c\u5b83\u901a\u8fc7\u4fdd\u5b58\u6570\u636e\u7684\u591a\u4e2a\u7248\u672c\uff0c\u5141\u8bb8\u8bfb\u5199\u64cd\u4f5c\u4e0d\u4e92\u76f8\u963b\u585e\uff0c\u4ece\u800c\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u5e76\u53d1\u6027\u80fd\u3002<\/p>\n<h3>MVCC \u7684\u6838\u5fc3\u601d\u60f3<\/h3>\n<ul>\n<li>\u4e3a\u6bcf\u4e2a\u6570\u636e\u884c\u7ef4\u62a4\u591a\u4e2a\u7248\u672c\uff0c\u4e0d\u540c\u4e8b\u52a1\u5728\u8bbf\u95ee\u540c\u4e00\u884c\u6570\u636e\u65f6\uff0c\u53ef\u80fd\u770b\u5230\u4e0d\u540c\u7684\u7248\u672c<\/li>\n<li>\u8bfb\u64cd\u4f5c\u65e0\u9700\u52a0\u9501\uff08\u975e\u9501\u5b9a\u8bfb\uff09\uff0c\u907f\u514d\u4e86\u4f20\u7edf\u9501\u673a\u5236\u4e2d\u8bfb\u963b\u585e\u5199\u3001\u5199\u963b\u585e\u8bfb\u7684\u95ee\u9898<\/li>\n<li>\u901a\u8fc7\u7248\u672c\u53f7\u63a7\u5236\uff0c\u5b9e\u73b0\u4e8b\u52a1\u7684\u9694\u79bb\u6027\uff08\u4e3b\u8981\u652f\u6301 <code>READ COMMITTED<\/code> \u548c <code>REPEATABLE READ<\/code> \u9694\u79bb\u7ea7\u522b\uff09<\/li>\n<\/ul>\n<h3>\u5b9e\u73b0\u5173\u952e\u6280\u672f<\/h3>\n<ol>\n<li>\n<p><strong>\u9690\u85cf\u5217<\/strong><br \/>\nInnoDB \u4e3a\u6bcf\u884c\u6570\u636e\u6dfb\u52a0\u4e86\u4e09\u4e2a\u9690\u85cf\u5217\uff1a<\/p>\n<ul>\n<li><code>DB_TRX_ID<\/code>\uff1a\u8bb0\u5f55\u6700\u540e\u4e00\u6b21\u4fee\u6539\u8be5\u6570\u636e\u7684\u4e8b\u52a1 ID<\/li>\n<li><code>DB_ROLL_PTR<\/code>\uff1a\u56de\u6eda\u6307\u9488\uff0c\u6307\u5411\u8be5\u884c\u6570\u636e\u7684 undo log\uff08\u64a4\u9500\u65e5\u5fd7\uff09<\/li>\n<li><code>DB_ROW_ID<\/code>\uff1a\u884c\u6807\u8bc6\uff08\u5f53\u8868\u6ca1\u6709\u4e3b\u952e\u65f6\u81ea\u52a8\u751f\u6210\uff09<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Undo Log\uff08\u64a4\u9500\u65e5\u5fd7\uff09<\/strong>  <\/p>\n<ul>\n<li>\u7528\u4e8e\u4fdd\u5b58\u6570\u636e\u4fee\u6539\u524d\u7684\u7248\u672c\uff0c\u5f62\u6210\u7248\u672c\u94fe<\/li>\n<li>\u4e8b\u52a1\u56de\u6eda\u65f6\uff0c\u901a\u8fc7 undo log \u6062\u590d\u6570\u636e<\/li>\n<li>MVCC \u901a\u8fc7\u904d\u5386 undo log \u94fe\u67e5\u627e\u7b26\u5408\u5f53\u524d\u4e8b\u52a1\u53ef\u89c1\u6027\u7684\u7248\u672c<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><strong>Read View\uff08\u8bfb\u89c6\u56fe\uff09<\/strong>  <\/p>\n<ul>\n<li>\u4e8b\u52a1\u542f\u52a8\u65f6\u751f\u6210\u7684\u4e00\u4e2a\u6570\u636e\u7ed3\u6784\uff0c\u7528\u4e8e\u5224\u65ad\u6570\u636e\u7248\u672c\u7684\u53ef\u89c1\u6027<\/li>\n<li>\u5305\u542b\u5f53\u524d\u6d3b\u8dc3\u4e8b\u52a1\u7684 ID \u5217\u8868\u3001\u6700\u5c0f\u6d3b\u8dc3\u4e8b\u52a1 ID\u3001\u6700\u5927\u4e8b\u52a1 ID \u7b49\u4fe1\u606f<\/li>\n<li>\u4e0d\u540c\u9694\u79bb\u7ea7\u522b\u751f\u6210 Read View \u7684\u65f6\u673a\u4e0d\u540c\uff1a\n<ul>\n<li><code>READ COMMITTED<\/code>\uff1a\u6bcf\u6b21\u67e5\u8be2\u65f6\u751f\u6210\u65b0\u7684 Read View<\/li>\n<li><code>REPEATABLE READ<\/code>\uff1a\u4e8b\u52a1\u542f\u52a8\u65f6\u751f\u6210\u4e00\u6b21 Read View\uff0c\u540e\u7eed\u67e5\u8be2\u590d\u7528<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3>\u53ef\u89c1\u6027\u5224\u65ad\u89c4\u5219<\/h3>\n<p>\u5bf9\u4e8e\u67d0\u4e2a\u6570\u636e\u7248\u672c\u7684 <code>DB_TRX_ID<\/code>\uff08\u4fee\u6539\u4e8b\u52a1 ID\uff09\uff1a<\/p>\n<ol>\n<li>\u82e5\u5c0f\u4e8e Read View \u4e2d\u7684\u6700\u5c0f\u6d3b\u8dc3\u4e8b\u52a1 ID \u2192 \u8be5\u7248\u672c\u53ef\u89c1<\/li>\n<li>\u82e5\u5927\u4e8e\u7b49\u4e8e Read View \u4e2d\u7684\u6700\u5927\u4e8b\u52a1 ID \u2192 \u8be5\u7248\u672c\u4e0d\u53ef\u89c1<\/li>\n<li>\u82e5\u5728\u6d3b\u8dc3\u4e8b\u52a1 ID \u5217\u8868\u4e2d \u2192 \u8be5\u7248\u672c\u4e0d\u53ef\u89c1\uff08\u5c5e\u4e8e\u672a\u63d0\u4ea4\u4e8b\u52a1\u4fee\u6539\uff09<\/li>\n<li>\u82e5\u4e0d\u5728\u6d3b\u8dc3\u4e8b\u52a1 ID \u5217\u8868\u4e2d \u2192 \u8be5\u7248\u672c\u53ef\u89c1\uff08\u5c5e\u4e8e\u5df2\u63d0\u4ea4\u4e8b\u52a1\u4fee\u6539\uff09<\/li>\n<\/ol>\n<h3>\u4f5c\u7528\u4e0e\u4f18\u52bf<\/h3>\n<ul>\n<li><strong>\u8bfb\u5199\u4e0d\u51b2\u7a81<\/strong>\uff1a\u8bfb\u64cd\u4f5c\u65e0\u9700\u52a0\u9501\uff0c\u5199\u64cd\u4f5c\u53ea\u9501\u5b9a\u5fc5\u8981\u7684\u884c<\/li>\n<li><strong>\u63d0\u9ad8\u5e76\u53d1\u6027\u80fd<\/strong>\uff1a\u591a\u4e2a\u4e8b\u52a1\u53ef\u540c\u65f6\u8bfb\u5199\u6570\u636e\u5e93\uff0c\u51cf\u5c11\u9501\u7ade\u4e89<\/li>\n<li><strong>\u652f\u6301\u4e0d\u540c\u9694\u79bb\u7ea7\u522b<\/strong>\uff1a\u901a\u8fc7 Read View \u751f\u6210\u65f6\u673a\u7684\u63a7\u5236\uff0c\u5b9e\u73b0 <code>READ COMMITTED<\/code> \u548c <code>REPEATABLE READ<\/code><\/li>\n<\/ul>\n<p>MVCC \u662f InnoDB \u5b9e\u73b0\u9ad8\u5e76\u53d1\u7684\u5173\u952e\uff0c\u5b83\u4e0e\u9501\u673a\u5236\uff08\u5982\u884c\u9501\u3001\u8868\u9501\uff09\u914d\u5408\uff0c\u5171\u540c\u4fdd\u969c\u4e86\u4e8b\u52a1\u7684 ACID \u7279\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL \u7684 MVCC\uff08Multi-Version Concurrency Control\uff0c\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff09&#8230; <\/p>\n<div class=\"read-more navbutton\"><a href=\"https:\/\/t.n-years.com\/?p=6842\">\u9605\u8bfb\u66f4\u591a<i class=\"fa fa-angle-double-right\"><\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[123],"tags":[],"class_list":["post-6842","post","type-post","status-publish","format-standard","hentry","category-123"],"_links":{"self":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6842"}],"version-history":[{"count":1,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6842\/revisions"}],"predecessor-version":[{"id":6843,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6842\/revisions\/6843"}],"wp:attachment":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}