{"id":928,"date":"2025-04-21T20:47:25","date_gmt":"2025-04-21T12:47:25","guid":{"rendered":"https:\/\/eve2333.top\/?p=928"},"modified":"2025-04-21T20:47:26","modified_gmt":"2025-04-21T12:47:26","slug":"mysql%e6%95%b0%e6%8d%ae%e5%ba%93%e5%85%a5%e9%97%a8%e5%88%b0%e5%a4%a7%e8%9b%87%e5%b0%9a%e7%a1%85%e8%b0%b7%e5%ae%8b%e7%ba%a2%e5%ba%b7%e8%80%81%e5%b8%88%e7%ac%94%e8%ae%b0-%e9%ab%98%e7%ba%a7%e7%af%87-p-14","status":"publish","type":"post","link":"https:\/\/eve2333.top\/?p=928","title":{"rendered":"MySQL\u6570\u636e\u5e93\u5165\u95e8\u5230\u5927\u86c7\u5c1a\u7845\u8c37\u5b8b\u7ea2\u5eb7\u8001\u5e08\u7b14\u8bb0 \u9ad8\u7ea7\u7bc7 part14"},"content":{"rendered":"\n

 \u7b2c14\u7ae0_MySQL\u4e8b\u52a1\u65e5\u5fd7<\/h1>\n\n\n\n

\u4e8b\u52a1\u67094\u79cd\u7279\u6027\uff1a\u539f\u5b50\u6027\u3001\u4e00\u81f4\u6027\u3001\u9694\u79bb\u6027\u548c\u6301\u4e45\u6027\u3002\u90a3\u4e48\u4e8b\u52a1\u7684\u56db\u79cd\u7279\u6027\u5230\u5e95\u662f\u57fa\u4e8e\u4ec0\u4e48\u673a\u5236\u5b9e\u73b0\u5462\uff1f
\u00b7\u4e8b\u52a1\u7684\u9694\u79bb\u6027\u7531\u9501\u673a\u5236\u5b9e\u73b0\u3002
\u00b7\u800c\u4e8b\u52a1\u7684\u539f\u5b50\u6027\u3001\u4e00\u81f4\u6027\u548c\u6301\u4e45\u6027\u7531\u4e8b\u52a1\u7684redo\u65e5\u5fd7\u548cundo\u65e5\u5fd7\u6765\u4fdd\u8bc1\u3002
1.REDOLOG\u79f0\u4e3a\u91cd\u505a\u65e5\u5fd7\uff0c\u63d0\u4f9b\u518d\u5199\u5165\u64cd\u4f5c\uff0c\u6062\u590d\u63d0\u4ea4\u4e8b\u52a1\u4fee\u6539\u7684\u9875\u64cd\u4f5c\uff0c\u7528\u6765\u4fdd\u8bc1\u4e8b\u52a1\u7684\u6301\u4e45\u6027\u3002
2.UNDOLOG\u79f0\u4e3a\u56de\u6eda\u65e5\u5fd7\uff0c\u56de\u6eda\u884c\u8bb0\u5f55\u5230\u67d0\u4e2a\u7279\u5b9a\u7248\u672c\uff0c\u7528\u6765\u4fdd\u8bc1\u4e8b\u52a1\u7684\u539f\u5b50\u6027\u3001\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n

\u6709\u7684DBA\u6216\u8bb8\u4f1a\u8ba4\u4e3aUNDO\u662fREDO\u7684\u9006\u8fc7\u7a0b\uff0c\u5176\u5b9e\u4e0d\u7136\u3002REDO\u548cUNDO\u90fd\u53ef\u4ee5\u89c6\u4e3a\u662f\u4e00\u79cd\u6062\u590d\u64cd\u4f5c\uff0c\u4f46\u662f\uff1a
1.redolog\uff1a\u662f\u5b58\u50a8\u5f15\u64ce\u5c42(innodb)\u751f\u6210\u7684\u65e5\u5fd7\uff0c\u8bb0\u5f55\u7684\u662f\"\u7269\u7406\u7ea7\u522b\"\u4e0a\u7684\u9875\u4fee\u6539\u64cd\u4f5c\uff0c\u6bd4\u5982\u9875\u53f7xxx\u3001\u504f\u79fb\u91cfyy\u5199\u5165\u4e86'zzz\u6570\u636e\u3002\u4e3b\u8981\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u7684\u53ef\u9760\u6027\uff1b
2.undolog\uff1a\u662f\u5b58\u50a8\u5f15\u64ce\u5c42\uff08innodb)\u751f\u6210\u7684\u65e5\u5fd7\uff0c\u8bb0\u5f55\u7684\u662f\u903b\u8f91\u64cd\u4f5c\u65e5\u5fd7\uff0c\u6bd4\u5982\u5bf9\u67d0\u4e00\u884c\u6570\u636e\u8fdb\u884c\u4e86INSERT\u8bed\u53e5\u64cd\u4f5c\uff0c\u90a3\u4e48undolog\u5c31\u8bb0\u5f55\u4e00\u6761\u4e0e\u4e4b\u76f8\u53cd\u7684DELETE\u64cd\u4f5c\u3002\u4e3b\u8981\u7528\u4e8e\u4e8b\u52a1\u7684\u56de\u6eda\uff08undolog\u8bb0\u5f55\u7684\u662f\u6bcf\u4e2a\u4fee\u6539\u64cd\u4f5c\u7684\u9006\u64cd\u4f5c\uff09\u548c\u4e00\u81f4\u6027\u975e\u9501\u5b9a\u8bfb\uff08undo log\u56de\u6eda\u884c\u8bb0\u5f55\u5230\u67d0\u79cd\u7279\u5b9a\u7684\u7248\u672c---MVCC\uff0c\u5373\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236)\u3002<\/p>\n\n\n\n

\n

\u4ece\u5185\u5b58\u5230\u78c1\u76d8\uff0c\u7ecf\u8fc71s\u5b8c\u6210\u64cd\u4f5c\uff0c\u5047\u5982\u5b95\u673a\u4e86\uff0c\u6570\u636e\u65e5\u5fd7\u4ece\u5185\u5b58\u4e2d\u5199\u5165redo\u91cc\u9762\uff0c\u91cd\u542f\u670d\u52a1\u5668\u540e\u5c31\u4eceredo\u91cc\u9762\u5b8c\u6210\u6570\u636e\u7684\u6062\u590d\uff0c<\/p>\n<\/blockquote>\n\n\n\n

\"\"<\/p>\n\n\n\n

1.redo\u65e5\u5fd7<\/h1>\n\n\n\n

InnoDB\u5b58\u50a8\u5f15\u64ce\u662f\u4ee5\u9875\u4e3a\u5355\u4f4d\u6765\u7ba1\u7406\u5b58\u50a8\u7a7a\u95f4\u7684\u3002\u5728\u771f\u6b63\u8bbf\u95ee\u9875\u9762\u4e4b\u524d\uff0c\u9700\u8981\u628a\u5728\u78c1\u76d8\u4e0a\u7684\u9875\u7f13\u5b58\u5230\u5185\u5b58\u4e2d\u7684BufferPool\u4e4b\u540e\u624d\u53ef\u4ee5\u8bbf\u95ee\u3002\u6240\u6709\u7684\u53d8\u66f4\u90fd\u5fc5\u987b\u5148\u66f4\u65b0\u7f13\u51b2\u6c60\u4e2d\u7684\u6570\u636e\uff0c\u7136\u540e\u7f13\u51b2\u6c60\u4e2d\u7684\u810f\u9875\u4f1a\u4ee5\u4e00\u5b9a\u7684\u9891\u7387\u88ab\u5237\u5165\u78c1\u76d8\uff08checkPoint\u673a\u5236\uff09\uff0c\u901a\u8fc7\u7f13\u51b2\u6c60\u6765\u4f18\u5316CPU\u548c\u78c1\u76d8\u4e4b\u95f4\u7684\u9e3f\u6c9f\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u4fdd\u8bc1\u6574\u4f53\u7684\u6027\u80fd\u4e0d\u4f1a\u4e0b\u964d\u592a\u5feb\u3002<\/p>\n\n\n\n

1.1\u4e3a\u4ec0\u4e48\u9700\u8981REDO\u65e5\u5fd7<\/h3>\n\n\n\n

\u4e00\u65b9\u9762\uff0c\u7f13\u51b2\u6c60\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u6d88\u9664CPU\u548c\u78c1\u76d8\u4e4b\u95f4\u7684\u9e3f\u6c9f\uff0ccheckpoint\u673a\u5236\u53ef\u4ee5\u4fdd\u8bc1\u6570\u636e\u7684\u6700\u7ec8\u843d\u76d8\uff0c\u7136\u800c\u7531\u4e8echeckpoint\u5e76\u4e0d\u662f\u6bcf\u6b21\u53d8\u66f4\u7684\u65f6\u5019\u5c31\u89e6\u53d1\u7684\uff0c\u800c\u662fmaster\u7ebf\u7a0b\u9694\u4e00\u6bb5\u65f6\u95f4\u53bb\u5904\u7406\u7684\u3002\u6240\u4ee5\u6700\u574f\u7684\u60c5\u51b5\u5c31\u662f\u4e8b\u52a1\u63d0\u4ea4\u540e\uff0c\u521a\u5199\u5b8c\u7f13\u51b2\u6c60\uff0c\u6570\u636e\u5e93\u5ca9\u673a\u4e86\uff0c\u90a3\u4e48\u8fd9\u6bb5\u6570\u636e\u5c31\u662f\u4e22\u5931\u7684\uff0c\u65e0\u6cd5\u6062\u590d\u3002<\/p>\n\n\n\n

1. \u4fee\u6539\u91cf\u4e0e\u5237\u65b0\u78c1\u76d8\u5de5\u4f5c\u91cf\u4e25\u91cd\u4e0d\u6210\u6bd4\u4f8b
\u6709\u65f6\u5019\u6211\u4eec\u4ec5\u4ec5\u4fee\u6539\u4e86\u67d0\u4e2a\u9875\u9762\u4e2d\u7684\u4e00\u4e2a\u5b57\u8282\uff0c\u4f46\u662f\u6211\u4eec\u77e5\u9053\u5728lnnoDB\u4e2d\u662f\u4ee5\u9875\u4e3a\u5355\u4f4d\u6765\u8fdb\u884c\u78c1\u76d8iO\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u6211\u4eec\u5728\u8be5\u4e8b\u52a1\u63d0\u4ea4\u65f6\u4e0d\u5f97\u4e0d\u5c06\u4e00\u4e2a\u5b8c\u6574\u7684\u9875\u9762\u4ece\u5185\u5b58\u4e2d\u5237\u65b0\u5230\u78c1\u76d8\uff0c\u6211\u4eec\u53c8\u77e5\u9053\u4e00\u4e2a\u9875\u9762\u9ed8\u8ba4\u662f16KB\u5927\u5c0f\uff0c\u53ea\u4fee\u6539\u4e00\u4e2a\u5b57\u8282\u5c31\u8981\u5237\u65b016KB\u7684\u6570\u636e\u5230\u78c1\u76d8\u4e0a\u663e\u7136\u662f\u592a\u5c0f\u9898\u5927\u505a\u4e86\u3002<\/p>\n\n\n\n

2.\u968f\u673aIO\u5237\u65b0\u8f83\u6162
\u4e00\u4e2a\u4e8b\u52a1\u53ef\u80fd\u5305\u542b\u5f88\u591a\u8bed\u53e5\uff0c\u5373\u4f7f\u662f\u4e00\u6761\u8bed\u53e5\u4e5f\u53ef\u80fd\u4fee\u6539\u8bb8\u591a\u9875\u9762\uff0c\u5047\u5982\u8be5\u4e8b\u52a1\u4fee\u6539\u7684\u8fd9\u4e9b\u9875\u9762\u53ef\u80fd\u5e76\u4e0d\u76f8\u90bb\uff0c\u8fd9\u5c31\u610f\u5473\u7740\u5728\u5c06\u67d0\u4e2a\u4e8b\u52a1\u4fee\u6539\u7684BufferPool\u4e2d\u7684\u9875\u9762\u5237\u65b0\u5230\u78c1\u76d8\u65f6\uff0c\u9700\u8981\u8fdb\u884c\u5f88\u591a\u7684\u968f\u673aI0\uff0c\u968f\u673aio\u6bd4\u987a\u5e8fio\u8981\u6162\uff0c\u5c24\u5176\u5bf9\u4e8e\u4f20\u7edf\u7684\u673a\u68b0\u786c\u76d8\u6765\u8bf4\u3002
\u53e6\u4e00\u4e2a\u89e3\u51b3\u7684\u601d\u8def\uff1a\u6211\u4eec\u53ea\u662f\u60f3\u8ba9\u5df2\u7ecf\u63d0\u4ea4\u4e86\u7684\u4e8b\u52a1\u5bf9\u6570\u636e\u5e93\u4e2d\u6570\u636e\u6240\u505a\u7684\u4fee\u6539\u6c38\u4e45\u751f\u6548\uff0c\u5373\u4f7f\u540e\u6765\u7cfb\u7edf\u5d29\u6e83\uff0c\u5728\u91cd\u542f\u540e\u4e5f\u80fd\u628a\u8fd9\u79cd\u4fee\u6539\u6062\u590d\u51fa\u6765\u3002\u6240\u4ee5\u6211\u4eec\u5176\u5b9e\u6ca1\u6709\u5fc5\u8981\u5728\u6bcf\u6b21\u4e8b\u52a1\u63d0\u4ea4\u65f6\u5c31\u628a\u8be5\u4e8b\u52a1\u5728\u5185\u5b58\u4e2d\u4fee\u6539\u8fc7\u7684\u5168\u90e8\u9875\u9762\u5237\u65b0\u5230\u78c1\u76d8\uff0c\u53ea\u9700\u8981\u628a\u4fee\u6539\u4e86\u54ea\u4e9b\u4e1c\u897f\u8bb0\u5f55\u4e00\u4e0b\u5c31\u597d\u3002\u6bd4\u5982\uff0c\u67d0\u4e2a\u4e8b\u52a1\u5c06\u7cfb\u7edf\u8868\u7a7a\u95f4\u4e2d\u7b2c10\u53f7\u9875\u9762\u4e2d\u504f\u79fb\u91cf\u4e3a100\u5904\u7684\u90a3\u4e2a\u5b57\u8282\u7684\u503c1\u6539\u62102\u3002\u6211\u4eec\u53ea\u9700\u8981\u8bb0\u5f55\u4e00\u4e0b\uff1a\u5c06\u7b2c0\u53f7\u8868\u7a7a\u95f4\u768410\u53f7\u9875\u9762\u7684\u504f\u79fb\u91cf\u4e3a100\u5904\u7684\u503c\u66f4\u65b0\u4e3a2\u3002<\/p>\n\n\n\n

InnoDB\u5f15\u5f15\u64ce\u7684\u4e8b\u52a1\u91c7\u7528\u4e86WAL\u6280\u672f\uff08Write-AheadLogging\uff09\uff0c\u8fd9\u79cd\u6280\u672f\u7684\u601d\u60f3\u5c31\u662f\u5148\u5199\u65e5\u5fd7\uff0c\u518d\u5199\u78c1\u76d8\uff0c\u53ea\u6709\u65e5\u5fd7\u5199\u5165\u6210\u529f\uff0c\u624d\u7b97\u4e8b\u52a1\u63d0\u4ea4\u6210\u529f\uff0c\u8fd9\u91cc\u7684\u65e5\u5fd7\u5c31\u662fredo log\u3002\u5f53\u53d1\u751f\u5ca9\u673a\u4e14\u6570\u636e\u672a\u5237\u5230\u78c1\u76d8\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u901a\u8fc7redolog\u6765\u6062\u590d\uff0c\u4fdd\u8bc1ACID\u4e2d\u7684D\uff0c\u8fd9\u5c31\u662fredo log\u7684\u4f5c\u7528\u3002<\/p>\n\n\n\n

\n

00:03
\u539f\u6587\uff1a
\u4e0d\u662f\u8bf4\u4e86\u54b1\u4eec\u8fd8\u6362\u6210\u7ea2\u8272\u7684\uff0c\u521a\u624d\u4e0d\u662f\u8bf4\u4e86\u8bf4\u8fd9\u4e2a\u662f\u5185\u5b58\u4e2d\u7684\uff0c\u8fd9\u4e2a\u662f\u78c1\u76d8\u54b1\u4eec\u9700\u8981\u4fdd\u8bc1\u4ed6\u4eec\u5c3d\u53ef\u80fd\u4e00\u81f4\u7684\uff0c\u4f60\u5c31\u522b\u4e00\u5b9a\u7684\u9891\u7387\u6216\u8005\u4e00\u6b21\u662f\u4e0d\u662f\u6211\u4eec\u6570\u636e\u4fee\u6539\u4e86\uff0c\u662f\u4e0d\u662f\u9a6c\u4e0a\u6211\u5c31\u53bb\u5c31\u5b9e\u65f6\u7684\u8fd9\u6837\u7684\u53bb\u505a\u4fee\u6539\uff0c\u5c31\u50cf\u6211\u4eec\u8bf4\u7c7b\u4f3c\u4e8e\u6211\u4eec\u4e8b\u52a1\u4e2d\u6267\u884c\u7684SQL\u8bed\u53e5\uff0c\u5176\u5b9e\u6267\u884cSQL\u8bed\u53e5\u5c31\u662f\u8ddf\u6211\u4eec\u5185\u5b58\u4e2d\u7684\u662f\u5427\uff1f\u7136\u540e\u66f4\u65b0\u4e5f\u9a6c\u4e0a\u53bb\u66f4\u65b0\u8fd9\u5757\uff0c\u518d\u6765\u4e00\u6761\u6570\u636e\uff0c\u4e00\u66f4\u65b0\u5185\u5b58\u5bb9\u6613\u6539\u4e5f\u9a6c\u4e0a\u53bb\u6539\uff0c\u662f\u4e0d\u662f\u8fd9\u6837\u7684\u8bdd\u6211\u4eec\u5c3d\u53ef\u80fd\u7684\u53bb\u4fdd\u8bc1\u8fd9\u4e2a\u53eb\u6301\u4e45\u6027\u7684\uff0c\u6bd4\u5982\u8fd9\u5757\u4f60\u63d0\u4ea4\u4e86\u8fd9\u5757\u76f8\u5f53\u4e8e\u7ed3\u675f\u4e86\uff0c\u6211\u4eec\u8fd9\u8fb9\u4e5f\u9a6c\u4e0a\u76f8\u5f53\u4e8e\u662f\u7ed9\u5b83\u786e\u5b9a\u7684\u7ed9\u5b83\u4fdd\u5b58\u4e0b\u6765\uff0c\u5c31\u6210\u8fd9\u6837\u4e00\u4e2a\u7279\u5f81\u4e86\uff0c\u5bf9\u5427\uff1f\u8fd9\u6837\u884c\u4e0d\u884c\uff1f<\/p>\n\n\n\n

00:31
\u539f\u6587\uff1a
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00:53
\u539f\u6587\uff1a
\u597d\u7684\uff0c\u7136\u540e\u4f60\u901a\u8fc7\u4e00\u4e2a\u4e8b\u52a1\u5f53\u4e2d\u7684\u4e00\u4e2aupdate\u7684\u8bed\u53e5\uff0c\u53ea\u6539\u4e86\u9875\u5f53\u4e2d\u7684\u4e00\u4e2a\u5b57\u8282\uff0c\u7136\u540e\u7531\u4e8e\u521a\u624d\u6211\u4eec\u8bf4\u6765\u8bf4\u5185\u5b58\u4e2d\u53ea\u8981\u4e00\u6539\u662f\u4e0d\u662f\u6b64\u5206\u949f\u8981\u6539\uff0c\u63a5\u4e0b\u6765\u7684\u8bdd\u4f60\u662f\u4e0d\u662f\u8981\u628a\u8fd9\u4e00\u9875\u7684\u6570\u636e\u5b8c\u6574\u7684\u9ed8\u8ba4\u54b1\u4eec\u8bf4\u662f16KB\u4e86\uff0c\u6240\u4ee5\u8981\u90fd\u5237\u65b0\u5230\u6211\u4eec\u78c1\u76d8\u4e0a\u3002<\/p>\n\n\n\n

01:05
\u539f\u6587\uff1a
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01:43
\u539f\u6587\uff1a
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02:21
\u539f\u6587\uff1a
\u90a3\u4e48\u5f53\u6211\u4eec\u540e\u8fb9\u4f60\u4e0d\u662f\u4e00\u79d2\u949f\u5237\u76d8\u4e00\u6b21\u5237\u76d8\u4e00\u6b21\u8fd9\u90fd\u6b63\u5e38\uff0c\u8fd9\u90fd\u6ca1\u4e8b\u662f\u5427\uff1f\u4f60\u8fd9\u5757\u5728\u8fd9\u4e2a\u5237\u76d8\u4e4b\u524d\u4f60\u7684\u5185\u5b58\u4e2d\u7684\uff0c\u6570\u636e\u6211\u4eec\u90fd\u662f\u5f80\u8fd9\u5757\u5148\u8bb0\u5f55\uff0c\u4e00\u65e6\u6765\u8bf4\u4f60\u4e00\u79d2\u949f\u7684\u6570\u636e\uff0c\u6211\u4eec\u8fd9\u4e2a\u670d\u52a1\u5668\u7684\u5b95\u673a\u4e86\uff0c\u8fd9\u4e00\u79d2\u949f\u7684\u6570\u636e\u600e\u4e48\u529e\uff1f<\/p>\n\n\n\n

02:32
\u539f\u6587\uff1a
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02:48
\u539f\u6587\uff1a
\u8fd9\u5c31\u662f\u6211\u4eecredo\u5b83\u7684\u4e00\u4e2a\u4f5c\u7528\uff0c\u6211\u4eec\u8fd9\u4ecd\u7136\u53ef\u4ee5\u8003\u8651\uff0c\u6bd4\u5982\u8bf4\u4e00\u79d2\u6765\u53bb\u505a\u4e00\u4e2a\u5237\u76d8\u7684\u64cd\u4f5c\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u4e0d\u53d8\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5f0a\u7aef\u54b1\u4eec\u5c31\u4e5f\u6ca1\u6709\u5448\u73b0\u51fa\u6765\u662f\u5427\uff1f Ok\u3002\u884c\uff0c\u8fd9\u54b1\u4eec\u8bf4redo\u65e5\u5fd7\u7684\u4e00\u4e2a\u4f5c\u7528\uff0c\u8fd9\u91cc\u8fb9\u6211\u4eec\u63d0\u5230\u8fd9\u4e2a\u6280\u672f\u53ebWAL\u6280\u672f\u53ebWrite-Ahead Logging\uff0c loading\u53eb\u4ec0\u4e48\uff1f<\/p>\n\n\n\n

03:03
\u539f\u6587\uff1a
\u53eb\u65e5\u5fd7\u4f18\u5148\u5199\u662f\u5427\uff1f\u8fd8\u6709\u4f18\u5148\u5199\u6216\u8005\u53eb\u4f18\u5148\u5199\u65e5\u5fd7\u7684\u4e00\u4e2a\u6280\u672f\uff0c\u76f8\u5f53\u4e8e\u6211\u4eec\u5bf9\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u6570\u636e\u4f60\u505a\u4e86\u66f4\u6539\u4e4b\u540e\uff0c\u5148\u4e0d\u8981\u60f3\u7740\u53bb\u5237\u65b0\u5230\u6211\u4eec\u78c1\u76d8\u7684\u6587\u4ef6\u4e2d\uff0c\u5148\u628a\u5b83\u4fdd\u5b58\u5728\u8fd9\u4e2a\u65e5\u5fd7\u4e2d\uff0c\u7136\u540e\u4f60\u518d\u8003\u8651\u6211\u4eec\u540e\u7eed\u9700\u8981\u5237\u76d8\u7684\u65f6\u5019\uff0c\u6216\u8005\u9700\u8981\u6062\u590d\u7684\u65f6\u5019\u518d\u53bb\u4f7f\u7528\u3002<\/p>\n\n\n\n

03:18
\u539f\u6587\uff1a
\u6211\u4eec\u540e\u7eed\u4f7f\u7528\u65e5\u5fd7\u7684\u60c5\u51b5\uff0c\u5c31\u4e00\u5b9a\u8981\u5148\u628a\u8fd9\u4e2a\u4e8b\u5f80\u65e5\u5fd7\u653e\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u901f\u5ea6\u5176\u5b9e\u662f\u6bd4\u8f83\u5feb\u7684\uff0c\u901f\u5ea6\u662f\u6bd4\u8f83\u5feb\u7684\uff0c\u4e0b\u8fb9\u8fd9\u4e9b\u81ea\u7136\u800c\u7136\u5c31\u63d0\u5230\u6211\u4eec\u9009\u62e9\u8fd9\u79cd\u65b9\u5f0f\u7684\u4f18\u70b9\u662f\u4ec0\u4e48\u662f\u5427\uff1f\u6bd4\u5982\u8bf4\u597d\u5904\u4ec0\u4e48\u7279\u70b9\u4ec0\u4e48\uff0c\u7b2c\u4e00\u4e2a\u8bf4\u5b83\u964d\u4f4e\u4e86\u6211\u4eec\u5237\u76d8\u7684\u9891\u7387\uff0c\u5c31\u76f8\u5f53\u4e8e\u6211\u4eec\u4e00\u5f00\u59cb\u7b80\u5355\u7c97\u66b4\u7684\u65b9\u5f0f\u6765\u8bb2\u7684\u8bdd\uff0c\u4f60\u5b9e\u65f6\u5237\u6211\u4eec\u8fd9\u662f\u4e0d\u662f\u8fd8\u53ef\u4ee5\u7ef4\u6301\u4e00\u79d2\u949f\u4e00\u5237\uff0c\u8fd9\u4e2a\u662f\u4e0d\u662f\u8981\u66f4\u597d\u4e00\u4e9b\u5bf9\u5427\uff1f\u5176\u4ed6\u7684\u8bdd\u8bf4redo\u5b83\u5360\u7528\u7684\u7a7a\u95f4\u8fd8\u6bd4\u8f83\u5c0f\uff0c\u8fd9\u4e5f\u7b97\u662f\u4e2a\u4f18\u70b9\u3002<\/p>\n\n\n\n

03:39
\u539f\u6587\uff1a
\u867d\u7136\u8bf4\u6211\u4eec\u7684\u5185\u5b58\u4e2d\u7684\uff0c\u6570\u636e\u5148\u628a\u5b83\u4fdd\u5b58\u5728 redo log\u5f53\u4e2d\uff0c\u8bf4\u78c1\u76d8\u7a7a\u95f4\u662f\u4e0d\u662f\u5360\u7528\u4f1a\u6bd4\u8f83\u5927\uff0c\u8fd9\u5757\u60f3\u8bf4\u7684\u662f\u5b83\u5360\u7528\u7a7a\u95f4\u5f88\u5c0f\uff0c\u8fd9\u4e5f\u662f\u5b83\u7684\u4f18\u70b9\u4f18\u70b9\uff0c\u597d\uff0c\u90a3\u4e48\u5b83\u7684\u7279\u70b9\u662f\u4ec0\u4e48\uff1f\u5c31\u662fredo\u65e5\u5fd7\u5b83\u662f\u987a\u5e8f\u5199\u5165\u78c1\u76d8\u7684\uff0c\u6211\u4eec\u628a\u8fd9\u4e2a\u4e8b\u52a1\u5f53\u4e2d\u4f60\u6267\u884c\u7684\u6bcf\u4e00\u4e2a\u8bed\u53e5\u4ea7\u751f\u7684\u5177\u4f53\u7684\u64cd\u4f5c\uff0c\u6211\u4eec\u662f\u6309\u7167\u8fd9\u4e2a\u987a\u5e8f\u8bb0\u5f55\u5728\u6211\u4eecredo\u65e5\u5fd7\u5f53\u4e2d\u7684\uff0c\u5b83\u5176\u5b9e\u4e5f\u662f\u5bf9\u5e94\u7684\u78c1\u76d8\u6587\u4ef6\u4e86\uff0c\u5b83\u5c31\u76f8\u5f53\u4e8e\u662f\u987a\u5e8f\u5199\u51fa\u4e00\u4e2a\u78c1\u76d8\u6587\u4ef6\u987a\u5e8f\u7684IO\u6bd4\u968f\u673aIO\u5b83\u8981\u5feb\u4e00\u4e9b\u3002<\/p>\n\n\n\n

04:03
\u539f\u6587\uff1a
\u5176\u6b21\u7684\u8bdd\u8fd9\u91cc\u8fb9\u63d0\u5230\u8bf4\u4e8b\u52a1\u5b83\u6267\u884c\u8fc7\u7a0bredo log\u5b83\u662f\u4e0d\u65ad\u8bb0\u5f55\u7684\uff0c\u8fd9\u662f\u5b83\u7684\u4e00\u4e2a\u7279\u70b9\uff0c\u5c31\u90a3\u4e48\u8fd9\u4e2a\u7279\u70b9\u76f8\u8f83\u4e8e\u6211\u4eec\u540e\u9762\u8981\u8bb2\u7684\u53ebbinlog\u5b83\u662f\u6709\u533a\u522b\u7684\u3002 binlog\u54b1\u4eec\u5148\u6cdb\u6cdb\u8bf4\u4e00\u4e0b\uff0c\u54b1\u4eec\u524d\u9762\u63d0\u5230\u8fc7\u8fd9\u4e2a\u53eb\u4e3b\u52a8\u590d\u5236\uff0c\u8bb2\u5230\u6211\u4eec\u6570\u636e\u5e93\u6574\u4e2a\u8c03\u7684\u65f6\u5019\uff0c\u5982\u679c\u4f60\u5355\u53f0\u4e3b\u673a\u6027\u80fd\u8fbe\u5230\u6781\u9650\u4e86\uff0c\u6211\u4eec\u662f\u4e0d\u662f\u53ef\u4ee5\u4f7f\u7528\u76f8\u5f53\u4e8e\u591a\u53f0\u8fd9\u4e2a\u670d\u52a1\u5668\u662f\u5427\uff1f\u6211\u4eec\u53ef\u4ee5\u6bd4\u5982\u8bf4\u7b80\u5355\u6765\u8bb2\u5c31\u4e00\u5f53\u4e3b\u673a\u4e00\u53f0\u5f53\u4ece\u673a\uff0c\u7136\u540e\u4e3b\u673a\u6765\u8d1f\u8d23\u5199\u7684\u64cd\u4f5c\uff0c\u7136\u540e\u4ece\u673a\u6765\u8d1f\u8d23\u8bfb\u7684\u64cd\u4f5c\uff0c\u8fd9\u65f6\u5019\u4f60\u80af\u5b9a\u8981\u4fdd\u8bc1\u4e3b\u4ece\uff0c\u6570\u636e\u7684\u4e00\u81f4\u6027\uff0c\u5bf9\u5427\uff1f<\/p>\n\n\n\n

04:28
\u539f\u6587\uff1a
\u4f60\u8fd9\u91cc\u8fb9\u5199\u51fa\u4e00\u4e2a\u6570\u636e\u4e4b\u540e\uff0c\u8fd9\u56fe\u8868\u4e2d\u662f\u4e0d\u662f\u5e94\u8be5\u6709\u8fd9\u4e2a\u6570\u636e\uff1f\u8fd9\u662f\u6211\u4eec\u600e\u4e48\u4fdd\u8bc1\uff0c\u6211\u4eec\u5c31\u63d0\u5230\u4e86\u53eb\u505abinlog\uff0c\u540e\u9762\u6211\u4eec\u8bb2\u4e86\u8fd9\u6837\u4e00\u4e2a\u8ba4\u8bc6binlog\u8fd8\u662f\u4e8c\u8fdb\u5236\u7684\u65e5\u5fd7\uff0c\u90a3\u4e48\u8fd9\u4e2a\u4ec0\u4e48\u610f\u601d\uff1f\u5c31\u662f\u6211\u4eec\u4e3b\u673a\u5f53\u4e2d\uff0c\u6bd4\u5982\u4f60\u5199\u4e00\u6761\u8bb0\u5f55\uff0c\u6211\u4eec\u5c31\u5728binlog\u91cc\u9762\u53bb\u505a\u4e00\u4e2a\u8bb0\u5f55\u3002\u7136\u540e\u7684\u8bdd\u6211\u4eec\u73b0\u5728\u4ecebinlog\u65e5\u5fd7\u5f53\u4e2d\u628a\u8fd9\u4e2a\u6570\u636e\u6062\u590d\u8fc7\u6765\u73b0\u5728\u4f60\u4e5f\u52a0\u4e86\u4e00\u5c31\u8fd9\u6837\u7684\u60c5\u51b5\uff0c\u597d\uff0c\u5927\u5bb6\u4f1a\u53d1\u73b0\u8bf4redo log\u600e\u4e48\u611f\u89c9\u8ddf binlog\u597d\u50cf\u4f5c\u7528\u4e00\u6837\u7684\uff0c\u662f\u5427\uff1f\u6709\u70b9\u50cf\u8fd9\u5757\u505a\u4e86\u4ec0\u4e48\u4e8b\uff0c\u6211\u4eec\u8fd9\u8fb9\u90fd\u8bb0\u5f55\u4e00\u4e0b\uff0credo log\u4e3a\u4e86\u4fbf\u4e8e\u6211\u4eec\u53bb\u505a\u4e8b\u52a1\u7684\u4e00\u4e2a\u6301\u4e45\u5316\uff0c\u4f60\u505a\u4ec0\u4e48\u4e86\u662f\u4e0d\u662f\u6211\u4eec\u4e5f\u8bb0\u5f55\u4e00\u4e0b\uff0c\u5927\u5bb6\u6ce8\u610f\u4ed6\u4eec\u4e8c\u8005\u8fd8\u662f\u6709\u533a\u522b\u7684\uff0c\u9996\u5148\u662f\u4e0d\u540c\u7684\u65e5\u5fd7\u6ca1\u6709\u7528\u4e00\u5957\u65e5\u5fd7\u53bb\u505a\uff0c\u5176\u6b21\u7684\u8bdd\u6211\u4eec\u8bf4 redo log\u5b83\u662f\u5728\u5b58\u50a8\u5f15\u64ce\u5c42\u4ea7\u751f\u7684\uff0c\u800cbinlog\u662f\u5728\u6570\u636e\u5c42\u3002<\/p>\n<\/blockquote>\n\n\n\n

\"\"<\/p>\n\n\n\n

 1.2 REDO\u65e5\u5fd7\u7684\u597d\u5904\u3001\u7279\u70b9<\/h3>\n\n\n\n

1.\u597d\u5904
\u00b7redo\u65e5\u5fd7\u964d\u4f4e\u4e86\u5237\u76d8\u9891\u7387
\u00b7redo\u65e5\u5fd7\u5360\u7528\u7684\u7a7a\u95f4\u975e\u5e38\u5c0f
\u5b58\u50a8\u8868\u7a7a\u95f4ID\u3001\u9875\u53f7\u3001\u504f\u79fb\u91cf\u4ee5\u53ca\u9700\u8981\u66f4\u65b0\u7684\u503c\uff0c\u6240\u9700\u7684\u5b58\u50a8\u7a7a\u95f4\u662f\u5f88\u5c0f\u7684\uff0c\u5237\u76d8\u5feb\u3002<\/p>\n\n\n\n

2.\u7279\u70b9<\/h4>\n\n\n\n
    \n
  • \u00b7redo\u65e5\u5fd7\u662f\u987a\u5e8f\u5199\u5165\u78c1\u76d8\u7684
    \u5728\u6267\u884c\u4e8b\u52a1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6bcf\u6267\u884c\u4e00\u6761\u8bed\u53e5\uff0c\u5c31\u53ef\u80fd\u4ea7\u751f\u82e5\u5e72\u6761redo\u65e5\u5fd7\uff0c\u8fd9\u4e9b\u65e5\u5fd7\u662f\u6309\u7167\u4ea7\u751f\u7684\u987a\u5e8f\u5199\u5165\u78c1\u76d8\u7684\uff0c\u4e5f\u5c31\u662f\u4f7f\u7528\u987a\u5e8fio\uff0c\u6548\u7387\u6bd4\u968f\u673aio\u5feb\u3002<\/li>\n\n\n\n
  • \u00b7\u4e8b\u52a1\u6267\u884c\u8fc7\u7a0b\u4e2d\uff0credolog\u4e0d\u65ad\u8bb0\u5f55
    redolog\u8ddfbin log\u7684\u533a\u522b\uff0credolog\u662f\u5b58\u50a8\u5f15\u64ce\u5c42\u4ea7\u751f\u7684\uff0c\u800cbinlog\u662f\u6570\u636e\u5e93\u5c42\u4ea7\u751f\u7684\u3002\u5047\u8bbe\u4e00\u4e2a\u4e8b\u52a1\uff0c\u5bf9\u8868\u505a10\u4e07\u884c\u7684\u8bb0\u5f55\u63d2\u5165\uff0c\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u4e00\u76f4\u4e0d\u65ad\u7684\u5f80redolog\/\u987a\u5e8f\u8bb0\u5f55\uff0c\u800cbinlog\u4e0d\u4f1a\u8bb0\u5f55\uff0c\u76f4\u5230\u8fd9\u4e2a\u4e8b\u52a1\u63d0\u4ea4\uff0c\u624d\u4f1a\u4e00\u6b21\u5199\u5165\u5230binlog\u6587\u4ef6\u4e2d\u3002<\/li>\n<\/ul>\n\n\n\n

    1.3 redo \u7684\u7ec4\u6210<\/h3>\n\n\n\n

    \"\"<\/p>\n\n\n\n

    \u53c2\u6570\u8bbe\u7f6e\uff1ainnodb_log_buffer_size\uff1a\nredo log buffer\u5927\u5c0f\uff0c\u9ed8\u8ba416M\uff0c\u6700\u5927\u503c\u662f4096M\uff0c\u6700\u5c0f\u503c\u4e3a1M\u3002\nmysql> show variables like '%innodb_log_buffer_size%';\n\n| Variable_name|Value|\n|innodb_log_buffer_size | 16777216 |\n\n\u91cd\u505a\u65e5\u5fd7\u6587\u4ef6\uff08redologfile\uff09\uff0c\u4fdd\u5b58\u5728\u786c\u76d8\u4e2d\uff0c\u662f\u6301\u4e45\u7684\u3002\nREDo\u65e5\u5fd7\u6587\u4ef6\u5982\u56fe\u6240\u793a\uff0c\u5176\u4e2d\u7684ib_logfile0\u548cib_logfile1\u5373\u4e3aREDo\u65e5\u5fd7\u3002<\/code><\/pre>\n\n\n\n
    <\/p>\n\n\n\n
    \u00a0\"\"<\/p>\n\n\n\n
    \u7b2c1\u6b65\uff1a\u5148\u5c06\u539f\u59cb\u6570\u636e\u4ece\u78c1\u76d8\u4e2d\u8bfb\u5165\u5185\u5b58\u4e2d\u6765\uff0c\u4fee\u6539\u6570\u636e\u7684\u5185\u5b58\u62f7\u8d1d
    \u7b2c2\u6b65\uff1a\u751f\u6210\u4e00\u6761\u91cd\u505a\u65e5\u5fd7\u5e76\u5199\u5165redologbuffer\uff0c\u8bb0\u5f55\u7684\u662f\u6570\u636e\u88ab\u4fee\u6539\u540e\u7684\u503c
    \u7b2c3\u6b65\uff1a\u5f53\u4e8b\u52a1commit\u65f6\uff0c\u5c06redologbuffer\u4e2d\u7684\u5185\u5bb9\u5237\u65b0\u5230redologfile\uff0c\u5bf9redologfile\u91c7\u7528\u8ffd\u52a0\u5199\u7684\u65b9\u5f0f
    \u7b2c4\u6b65\uff1a\u5b9a\u671f\u5c06\u5185\u5b58\u4e2d\u4fee\u6539\u7684\u6570\u636e\u5237\u65b0\u5230\u78c1\u76d8\u4e2d<\/p>\n\n\n\n
    Write-AheadLog\uff08\u9884\u5148\u65e5\u5fd7\u6301\u4e45\u5316\uff09\uff1a\u5728\u6301\u4e45\u5316\u4e00\u4e2a\u6570\u636e\u9875\u4e4b\u524d\uff0c\u5148\u5c06\u5185\u5b58\u4e2d\u76f8\u5e94\u7684\u65e5\u5fd7\u9875\u6301\u4e45\u5316\u3002<\/p>\n\n\n\n
    1.5 redolog\u7684\u5237\u76d8\u7b56\u7565<\/h3>\n\n\n\n
    redolog\u7684\u5199\u5165\u5e76\u4e0d\u662f\u76f4\u63a5\u5199\u5165\u78c1\u76d8\u7684\uff0cInnoDB\u5f15\u5f15\u64ce\u4f1a\u5728\u5199redolog\u7684\u65f6\u5019\u5148\u5199redologbuffer\uff0c\u4e4b\u540e\u4ee5\u4e00\u5b9a\u7684\u9891\u7387
    \u5237\u5165\u5230\u771f\u6b63\u7684redologfile\u4e2d\u3002\u8fd9\u91cc\u7684\u4e00\u5b9a\u9891\u7387\u600e\u4e48\u770b\u5f85\u5462\uff1f\u8fd9\u5c31\u662f\u6211\u4eec\u8981\u8bf4\u7684\u5237\u76d8\u7b56\u7565\u3002<\/p>\n\n\n\n
    \u6ce8\u610f\uff0credologbuffer\u5237\u76d8\u5230redologfile\u7684\u8fc7\u7a0b\u5e76\u4e0d\u662f\u771f\u6b63\u7684\u5237\u5230\u78c1\u76d8\u4e2d\u53bb\uff0c\u53ea\u662f\u5237\u5165\u5230\u6587\u4ef6\u7cfb\u7edf\u7f13\u5b58\uff08page cache\uff09\u4e2d\u53bb\uff08\u8fd9\u662f\u73b0\u4ee3\u64cd\u4f5c\u7cfb\u7edf\u4e3a\u4e86\u63d0\u9ad8\u6587\u4ef6\u5199\u5165\u6548\u7387\u505a\u7684\u4e00\u4e2a\u4f18\u5316\uff09\uff0c\u771f\u6b63\u7684\u5199\u5165\u4f1a\u4ea4\u7ed9\u7cfb\u7edf\u81ea\u5df2\u6765\u51b3\u5b9a\uff08\u6bd4\u5982pagecache\u8db3\u591f\u5927\u4e86\uff09\u3002\u90a3\u4e48\u5bf9\u4e8eInnoDB\u6765\u8bf4\u5c31\u5b58\u5728\u4e00\u4e2a\u95ee\u9898\uff0c\u5982\u679c\u4ea4\u7ed9\u7cfb\u7edf\u6765\u540c\u6b65\uff0c\u540c\u6837\u5982\u679c\u7cfb\u7edf\u5ca9\u673a\uff0c\u90a3\u4e48\u6570\u636e\u4e5f\u4e22\u5931\u4e86\uff08\u867d\u7136\u6574\u4e2a\u7cfb\u7edf\u5b95\u673a\u7684\u6982\u7387\u8fd8\u662f\u6bd4\u8f83\u5c0f\u7684\uff09\u3002<\/p>\n\n\n\n
    \u9488\u5bf9\u8fd9\u79cd\u60c5\u51b5\uff0cInnoDB\u7ed9\u51fainnodb_flush_log_at_trx_commit\u53c2\u6570\uff0c\u8be5\u53c2\u6570\u63a7\u5236commit\u63d0\u4ea4\u4e8b\u52a1\u65f6\uff0c\u5982\u4f55\u5c06redolog buffer\u4e2d\u7684\u65e5\u5fd7\u5237\u65b0\u5230redolog file\u4e2d\u3002\u5b83\u652f\u6301\u4e09\u79cd\u7b56\u7565\uff1a<\/p>\n\n\n\n
      \n
    1. \u8bbe\u7f6e\u4e3a0\uff1a\u8868\u793a\u6bcf\u6b21\u4e8b\u52a1\u63d0\u4ea4\u65f6\u4e0d\u8fdb\u884c\u5237\u76d8\u64cd\u4f5c\u3002\uff08\u7cfb\u7edf\u9ed8\u8ba4masterthread\u6bcf\u96941s\u8fdb\u884c\u4e00\u6b21\u91cd\u505a\u65e5\u5fd7\u7684\u540c\u6b65\uff09<\/li>\n\n\n\n
    2. \u8bbe\u7f6e\u4e3a1\uff1a\u8868\u793a\u6bcf\u6b21\u4e8b\u52a1\u63d0\u4ea4\u65f6\u90fd\u5c06\u8fdb\u884c\u540c\u6b65\uff0c\u5237\u76d8\u64cd\u4f5c\uff08\u9ed8\u8ba4\u503c\uff09<\/li>\n\n\n\n
    3. \u8bbe\u7f6e\u4e3a2\uff1a\u8868\u793a\u6bcf\u6b21\u4e8b\u52a1\u63d0\u4ea4\u65f6\u90fd\u53ea\u628aredologbuffer\u5185\u5bb9\u5199\u5165page cache\uff0c\u4e0d\u8fdb\u884c\u540c\u6b65\u3002\u7531os\u81ea\u5df1\u51b3\u5b9a\u4ec0\u4e48\u65f6\u5019\u540c\u6b65\u5230\u78c1\u76d8\u6587\u4ef6\u3002<\/li>\n<\/ol>\n\n\n\n
       \u9664\u4e86\u540e\u53f0\u7ebf\u7a0b\u6bcf\u79d21\u6b21\u7684\u8f6e\u8be2\u64cd\u4f5c\uff0c\u8fd8\u6709\u4e00\u79cd\u60c5\u51b5\uff0c\u5f53edologbuffer\u5360\u7528\u7684\u7a7a\u95f4\u5373\u5c06\u8fbe\u5230innodb_log_buffer_size\uff08\u8fd9\u4e2a\u53c2\u6570\u9ed8\u8ba4\u662f16M\uff09\u7684\u4e00\u534a\u7684\u65f6\u5019\uff0c\u540e\u53f0\u7ebf\u7a0b\u4f1a\u4e3b\u52a8\u5237\u76d8\u3002<\/p>\n\n\n\n
      \"\"<\/p>\n\n\n\n
      \n
       \u5c0f\u7ed3\uff1ainnodb_flush_log_at_trx_commit=1
      \u4e3a1\u65f6\uff0c\u53ea\u8981\u4e8b\u52a1\u63d0\u4ea4\u6210\u529f\uff0credolog\u8bb0\u5f55\u5c31\u4e00\u5b9a\u5728\u786c\u76d8\u91cc\uff0c\u4e0d\u4f1a\u6709\u4efb\u4f55\u6570\u636e\u4e22\u5931\u3002
      \u5982\u679c\u4e8b\u52a1\u6267\u884c\u671f\u95f4MySQL\u6302\u4e86\u6216\u5ca9\u673a\uff0c\u8fd9\u90e8\u5206\u65e5\u5fd7\u4e22\u4e86\uff0c\u4f46\u662f\u4e8b\u52a1\u5e76\u6ca1\u6709\u63d0\u4ea4\uff0c\u6240\u4ee5\u65e5\u5fd7\u4e22\u4e86\u4e5f\u4e0d\u4f1a\u6709\u635f\u5931\u3002\u53ef\u4ee5\u4fdd\u8bc1ACID\u7684D\uff0c\u6570\u636e\u7edd\u5bf9\u4e0d\u4f1a\u4e22\u5931\uff0c\u4f46\u662f\u6548\u7387\u6700\u5dee\u7684\u3002
      \u5efa\u8bae\u4f7f\u7528\u9ed8\u8ba4\u503c\uff0c\u867d\u7136\u64cd\u4f5c\u7cfb\u7edf\u5ca9\u673a\u7684\u6982\u7387\u7406\u8bba\u5c0f\u4e8e\u6570\u636e\u5e93\u5ca9\u673a\u7684\u6982\u7387\uff0c\u4f46\u662f\u4e00\u822c\u65e2\u7136\u4f7f\u7528\u4e86\u4e8b\u52a1\uff0c\u90a3\u4e48\u6570\u636e\u7684\u5b89\u5168\u76f8\u5bf9\u6765\u8bf4\u66f4\u91cd\u8981\u4e9b\u3002<\/p>\n<\/blockquote>\n\n\n\n
      \"\"<\/p>\n\n\n\n
      \"\"<\/p>\n\n\n\n
      \n
      \u5c0f\u7ed3\uff1ainnodb_flush_log_at_trx_commit=0<\/p>\n\n\n\n
      \u4e3a0\u65f6\uff0cmasterthread\u4e2d\u6bcf1\u79d2\u8fdb\u884c\u4e00\u6b21\u91cd\u505a\u65e5\u5fd7\u7684fsync\u64cd\u4f5c\uff0c\u56e0\u6b64\u5b9e\u4f8bcrash\u6700\u591a\u4e22\u59311\u79d2\u949f\u5185\u7684\u4e8b\u52a1\u3002\uff08masterthread\u662f\u8d1f\u8d23\u5c06\u7f13\u51b2\u6c60\u4e2d\u7684\u6570\u636e\u5f02\u6b65\u5237\u65b0\u5230\u78c1\u76d8\uff0c\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\uff09
      \u6570\u503c0\u7684\u8bdd\uff0c\u662f\u4e00\u79cd\u6298\u4e2d\u7684\u505a\u6cd5\uff0c\u5b83\u7684io\u6548\u7387\u7406\u8bba\u662f\u9ad8\u4e8e1\u7684\uff0c\u4f4e\u4e8e2\u7684\uff0c\u8fd9\u79cd\u7b56\u7565\u4e5f\u6709\u4e22\u5931\u6570\u636e\u7684\u98ce\u9669\uff0c\u4e5f\u65e0\u6cd5\u4fdd\u8bc1D\u3002<\/p>\n<\/blockquote>\n\n\n\n
      #10-\u4e8b\u52a1\u65e5\u5fd7\n\nUSE atguigudb3;\n\nCREATE TABLE test_load(\na INT,\nb CHAR(80)\n)ENGINE=INNODB;\n\n\n#\u521b\u5efa\u5b58\u50a8\u8fc7\u7a0b\uff0c\u7528\u4e8e\u5411test_load\u4e2d\u6dfb\u52a0\u6570\u636e\nDELIMITER\/\/\nCREATE PROCEDURE p_load(COUNT INT UNSIGNED)\nBEGIN\nDECLARE s INT UNSIGNED DEFAULT 1;\nDECLARE c CHAR(80)DEFAULT REPEAT('a',80);\nWHILE s<=COUNT DO\nINSERT INTO test_load SELECT NULL,c;\nCOMMIT;\nSET s=s+1;\nEND WHILE;\nEND \/\/\nDELIMITER;\n\n#\u6d4b\u8bd51\uff1a\n#\u8bbe\u7f6e\u5e76\u67e5\u770b\uff1ainnodb_flush_log_at_trx_commit\n\nSHOW VARIABLES LIKE 'innodb_flush_log_at_trx_commit';\n\n#set GLOBAL innodb_flush_log_at_trx_commit = 1;\n\n#\u8c03\u7528\u5b58\u50a8\u8fc7\u7a0b\nCALL p_load(30000); #1min 28sec\n\n#\u6d4b\u8bd52\uff1a\nTRUNCATE TABLE test_load;\n\nSELECT COUNT(*) FROM test_load;\n\nSET GLOBAL innodb_flush_log_at_trx_commit = 0;\n\nSHOW VARIABLES LIKE 'innodb_flush_log_at_trx_commit';\n\n#\u8c03\u7528\u5b58\u50a8\u8fc7\u7a0b\nCALL p_load(30000); #37.945 sec\n\n#\u6d4b\u8bd53\uff1a\nTRUNCATE TABLE test_load;\n\nSELECT COUNT(*) FROM test_load;\n\nSET GLOBAL innodb_flush_log_at_trx_commit = 2;\n\nSHOW VARIABLES LIKE 'innodb_flush_log_at_trx_commit';\n\n#\u8c03\u7528\u5b58\u50a8\u8fc7\u7a0b\nCALL p_load(30000); #45.173 sec<\/code><\/pre>\n\n\n\n
      \u800c\u9488\u5bf9\u4e0a\u8ff0\u5b58\u50a8\u8fc7\u7a0b\uff0c\u4e3a\u4e86\u63d0\u9ad8\u4e8b\u52a1\u7684\u63d0\u4ea4\u6027\u80fd\uff0c\u5e94\u8be5\u5728\u5c063\u4e07\u884c\u8bb0\u5f55\u63d2\u5165\u8868\u540e\u8fdb\u884c\u4e00\u6b21\u7684COMMIT\u64cd\u4f5c\uff0c\u800c\u4e0d\u662f\u6bcf\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\u540e\u8fdb\u884c\u4e00\u6b21COMMIT\u64cd\u4f5c\u3002\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\u53ef\u4ee5\u4f7f\u4e8b\u52a1\u65b9\u6cd5\u5728rollback\u65f6\u56de\u6eda\u5230\u4e8b\u52a1\u6700\u5f00\u59cb\u7684\u786e\u5b9a\u72b6\u6001\u3002\u5efa\u8bae\u8fd8\u662f\u90091\u7ef4\u6301\u4e8b\u7269\u7684acid\u6027<\/strong><\/p>\n\n\n\n
       1.7 \u5199\u5165redo log buffer<\/h3>\n\n\n\n
      \u8fc7\u7a0b 1. \u8865\u5145\u6982\u5ff5\uff1aMini-Transaction MySQL\u628a\u5bf9\u5e95\u5c42\u9875\u9762\u4e2d\u7684\u4e00\u6b21\u539f\u5b50\u8bbf\u95ee\u7684\u8fc7\u7a0b\u79f0\u4e4b\u4e3a\u4e00\u4e2aMini-Transaction\uff0c\u7b80\u79f0mtr\uff0c\u6bd4\u5982\uff0c\u5411\u67d0\u4e2a\u7d22\u5f15\u5bf9\u5e94\u7684B+\u6811\u4e2d\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\u7684\u8fc7\u7a0b\u5c31\u662f\u4e00\u4e2aMini-Transaction\u3002\u4e00\u4e2a\u6240\u8c13\u7684mtr\u53ef\u4ee5\u5305\u542b\u4e00\u7ec4redo\u65e5\u5fd7\uff0c\u5728\u8fdb\u884c\u5d29\u6e83\u6062\u590d\u65f6\u8fd9\u4e00\u7ec4redo\u65e5\u5fd7\u4f5c\u4e3a\u4e00\u4e2a\u4e0d\u53ef\u5206\u5272\u7684\u6574\u4f53\u3002 \u4e00\u4e2a\u4e8b\u52a1\u53ef\u4ee5\u5305\u542b\u82e5\u5e72\u6761\u8bed\u53e5\uff0c\u6bcf\u4e00\u6761\u8bed\u53e5\u5176\u5b9e\u662f\u7531\u82e5\u5e72\u4e2amtr\u7ec4\u6210\uff0c\u6bcf\u4e00\u4e2amtr\u53c8\u53ef\u4ee5\u5305\u542b\u82e5\u5e72\u6761redo\u65e5\u5fd7\uff0c\u753b\u4e2a\u56fe\u8868\u793a\u5b83\u4eec\u7684\u5173\u7cfb\u5c31\u662f\u8fd9\u6837\uff1a\"\"<\/p>\n\n\n\n
      \"\"<\/p>\n\n\n\n
       \u4e00\u4e2amtr\u6267\u884c\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u4ea7\u751f\u82e5\u5e72\u6761redo\u65e5\u5fd7\uff0c\u8fd9\u4e9bredo\u65e5\u5fd7\u662f\u4e00\u4e2a\u4e0d\u53ef\u5206\u5272\u7684\u7ec4\u201d\uff0c\u6240\u4ee5\u5176\u5b9e\u5e76\u4e0d\u662f\u6bcf\u751f\u6210\u4e00\u6761redo\u65e5\u5fd7\uff0c\u5c31\u5c06\u5176\u63d2\u5165\u5230logbuffer\u4e2d\uff0c\u800c\u662f\u6bcf\u4e2amtr\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u4ea7\u751f\u7684\u65e5\u5fd7\u5148\u6682\u65f6\u5b58\u5230\u4e00\u4e2a\u5730\u65b9\uff0c\u5f53\u8be5mtr\u7ed3\u675f\u7684\u65f6\u5019\uff0c\u5c06\u8fc7\u7a0b\u4e2d\u4ea7\u751f\u7684\u4e00\u7ec4redo\u65e5\u5fd7\u518d\u5168\u90e8\u590d\u5236\u5230logbuffer\u4e2d\u3002\u6211\u4eec\u73b0\u5728\u5047\u8bbe\u6709\u4e24\u4e2a\u540d\u4e3aT1\u3001T2\u7684\u4e8b\u52a1\uff0c\u6bcf\u4e2a\u4e8b\u52a1\u90fd\u5305\u542b2\u4e2amtr\uff0c\u6211\u4eec\u7ed9\u8fd9\u51e0\u4e2amtr\u547d\u540d\u4e00\u4e0b\uff1a<\/p>\n\n\n\n
      \u00b7\u4e8b\u52a1T1\u7684\u4e24\u4e2amtr\u5206\u522b\u79f0\u4e3amtr_T1_1\u548cmtr_T1_2\u3002\uff08\u8fd9\u4e24\u4e2a\u5b9e\u9645\u4e0a\u662f\u53ef\u4ee5\u4e0d\u5916\u6298\u7684\uff09
      \u00b7\u4e8b\u52a1T2\u7684\u4e24\u4e2amtr\u5206\u522b\u79f0\u4e3amtr_T2_1\u548cmtr_T2_2\u3002
      \u6bcf\u4e2amtr\u90fd\u4f1a\u4ea7\u751f\u4e00\u7ec4redo\u65e5\u5fd7\uff0c<\/p>\n\n\n\n
      \u00a0\u4e0d\u540c\u7684\u4e8b\u52a1\u53ef\u80fd\u662f\u5e76\u53d1\u6267\u884c\u7684\uff0c\u6240\u4ee5T1\u3001T2\u4e4b\u95f4\u7684mtr\u53ef\u80fd\u662f\u4ea4\u66ff\u6267\u884c\u7684\u3002\u6bcf\u5f53\u4e00\u4e2amtr\u6267\u884c\u5b8c\u6210\u65f6\uff0c\u4f34\u968f\u8be5mtr\u751f\u6210\u7684\u4e00\u7ec4redo\u65e5\u5fd7\u5c31\u9700\u8981\u88ab\u590d\u5236\u5230logbuffer\u4e2d\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e0d\u540c\u4e8b\u52a1\u7684mtr\u53ef\u80fd\u662f\u4ea4\u66ff\u5199\u5165logbuffer\u7684\uff0c\u6211\u4eec\u753b\u4e2a\u793a\u610f\u56fe\uff08\u4e3a\u4e86\u7f8e\u89c2\uff0c\u6211\u4eec\u628a\u4e00\u4e2amtr\u4e2d\u4ea7\u751f\u7684\u6240\u6709\u7684redo\u65e5\u5fd7\u5f53\u4f5c\u4e00\u4e2a\u6574\u4f53\u6765\u753b\uff09\uff1a\"\"<\/p>\n\n\n\n
      3.redologblock\u7684\u7ed3\u6784\u56fe<\/h4>\n\n\n\n
      \u4e00\u4e2aredologblock\u662f\u7531\u65e5\u5fd7\u5934\u3001\u65e5\u5fd7\u4f53\u3001\u65e5\u5fd7\u5c3e\u7ec4\u6210\u3002\u65e5\u5fd7\u5934\u5360\u752812\u5b57\u8282\uff0c\u65e5\u5fd7\u5c3e\u5360\u75288\u5b57\u8282\uff0c\u6240\u4ee5\u4e00\u4e2ablock\u771f\u6b63\u80fd\u5b58\u50a8\u7684\u6570\u636e\u5c31\u662f512-12-8=492\u5b57\u8282\u3002<\/p>\n\n\n\n
      \u4e3a\u4ec0\u4e48\u4e00\u4e2ablock\u8bbe\u8ba1\u6210512\u5b57\u8282\uff1f
      \u8fd9\u4e2a\u548c\u78c1\u76d8\u7684\u6247\u533a\u6709\u5173\uff0c\u673a\u68b0\u78c1\u76d8\u9ed8\u8ba4\u7684\u6247\u533a\u5c31\u662f512\u5b57\u8282\uff0c\u5982\u679c\u4f60\u8981\u5199\u5165\u7684\u6570\u636e\u5927\u4e8e512\u5b57\u8282\uff0c\u90a3\u4e48\u8981\u5199\u5165\u7684\u6247\u533a\u80af\u5b9a\u4e0d\u6b62\u4e00\u4e2a\uff0c\u8fd9\u65f6\u5c31\u8981\u6d89\u53ca\u5230\u76d8\u7247\u7684\u8f6c\u52a8\uff0c\u627e\u5230\u4e0b\u4e00\u4e2a\u6247\u533a\uff0c\u5047\u8bbe\u73b0\u5728\u9700\u8981\u5199\u5165\u4e24\u4e2a\u6247\u533aA\u548cB\uff0c\u5982\u679c\u6247\u533aA\u5199\u5165\u6210\u529f\uff0c\u800c\u6247\u533aB\u5199\u5165\u5931\u8d25\uff0c\u90a3\u4e48\u5c31\u4f1a\u51fa\u73b0\u975e\u539f\u5b50\u6027\u7684\u5199\u5165\uff0c\u800c\u5982\u679c\u6bcf\u6b21\u53ea\u5199\u5165\u548c\u6247\u533a\u7684\u5927\u5c0f\u4e00\u6837\u7684512\u5b57\u8282\uff0c\u90a3\u4e48\u6bcf\u6b21\u7684\u5199\u5165\u90fd\u662f\u539f\u5b50\u6027\u7684\u3002 <\/p>\n\n\n\n
      1.8 redo log file<\/h3>\n\n\n\n
      1. \u76f8\u5173\u53c2\u6570\u8bbe\u7f6e<\/h4>\n\n\n\n
      - innodb_log_group_home_dir\uff1a\u6307\u5b9a redo log \u6587\u4ef6\u7ec4\u6240\u5728\u7684\u8def\u5f84\uff0c\u9ed8\u8ba4\u503c\u4e3a .\/\uff0c\u8868\u793a\u5728\u6570\u636e\u5e93\u7684\u6570\u636e\u76ee\u5f55\u4e0b\u3002MySQL\u7684\u9ed8\u8ba4\u6570\u636e\u76ee\u5f55\uff08\/var\/lib\/mysql\uff09\u4e0b\u9ed8\u8ba4\u6709\u4e24\u4e2a\u540d\u4e3a ib_logfile0 \u548c ib_logfile1 \u7684\u6587\u4ef6\uff0clog buffer\u4e2d\u7684\u65e5\u5fd7\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u5c31\u662f\u5237\u65b0\u5230\u8fd9\u4e24\u4e2a\u78c1\u76d8\u6587\u4ef6\u4e2d\u3002\u6b64redo\u65e5\u5fd7\u6587\u4ef6\u4f4d\u7f6e\u8fd8\u53ef\u4ee5\u4fee\u6539\u3002
      - innodb_log_files_in_group\uff1a\u6307\u660eredo log file\u7684\u4e2a\u6570\uff0c\u547d\u540d\u65b9\u5f0f\u5982\uff1aib_logfile0, iblogfile1... iblogfilen\u3002\u9ed8\u8ba42\u4e2a\uff0c\u6700\u5927100\u4e2a\u3002<\/p>\n\n\n\n
      mysql> show variables like 'innodb_log_files_in_group';
      +-------------------------+-------+
      | Variable_name          | Value |
      +-------------------------+-------+
      | innodb_log_files_in_group | 2     |
      +-------------------------+-------+
      #ib_logfile0
      #ib_logfile1<\/p>\n\n\n\n
      - innodb_flush_log_at_trx_commit\uff1a\u63a7\u5236 redo log \u5237\u65b0\u5230\u78c1\u76d8\u7684\u7b56\u7565\uff0c\u9ed8\u8ba4\u4e3a1\u3002
      - innodb_log_file_size\uff1a\u5355\u4e2a redo log \u6587\u4ef6\u8bbe\u7f6e\u5927\u5c0f\uff0c\u9ed8\u8ba4\u503c\u4e3a 48M\u3002\u6700\u5927\u503c\u4e3a512G\uff0c\u6ce8\u610f\u6700\u5927\u503c\u6307\u7684\u662f\u6574\u4e2a redo log \u7cfb\u5217\u6587\u4ef6\u4e4b\u548c\uff0c\u5373\uff08innodb_log_files_in_group * innodb_log_file_size\uff09\u4e0d\u80fd\u5927\u4e8e\u6700\u5927\u503c512G\u3002<\/p>\n\n\n\n
      mysql> show variables like 'innodb_log_file_size';
      +-------------------------+------------+
      | Variable_name          | Value      |
      +-------------------------+------------+
      | innodb_log_file_size    | 50331648   |
      +-------------------------+------------+
      mysql<\/p>\n\n\n\n
      \u6839\u636e\u4e1a\u52a1\u4fee\u6539\u5176\u5927\u5c0f\uff0c\u4ee5\u4fbf\u5bb9\u7eb3\u8f83\u5927\u7684\u4e8b\u52a1\u3002\u7f16\u8f91my.cnf\u6587\u4ef6\u5e76\u91cd\u542f\u6570\u636e\u5e93\u751f\u6548\uff0c\u5982\u4e0b\u6240\u793a<\/p>\n\n\n\n
      [root@localhost ~]# vim \/etc\/my.cnf
      innodb_log_file_size=200M<\/p>\n\n\n\n
      \u5728\u6570\u636e\u5e93\u5b9e\u4f8b\u66f4\u65b0\u6bd4\u8f83\u9891\u7e41\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u9002\u5f53\u52a0\u5927 redo log \u7ec4\u6570\u548c\u5927\u5c0f\u3002\u4f46\u4e5f\u4e0d\u63a8\u8350 redo log \u8bbe\u7f6e\u8fc7\u5927\uff0c\u5728MySQL\u5d29\u6e83\u6062\u590d\u65f6\u4f1a\u91cd\u65b0\u6267\u884cREDO\u65e5\u5fd7\u4e2d\u7684\u8bb0\u5f55\u3002<\/p>\n\n\n\n
      \"\"<\/p>\n\n\n\n
       3.checkpoint<\/h4>\n\n\n\n
      \u5728\u6574\u4e2a\u65e5\u5fd7\u6587\u4ef6\u7ec4\u4e2d\u8fd8\u6709\u4e24\u4e2a\u91cd\u8981\u7684\u5c5e\u6027\uff0c\u5206\u522b\u662f write pos\u3001checkpoint
      - write pos \u662f\u5f53\u524d\u8bb0\u5f55\u7684\u4f4d\u7f6e\uff0c\u4e00\u8fb9\u5199\u4e00\u8fb9\u540e\u79fb
      - checkpoint \u662f\u5f53\u524d\u8981\u64e6\u9664\u7684\u4f4d\u7f6e\uff0c\u4e5f\u662f\u5f80\u540e\u63a8\u79fb<\/p>\n\n\n\n
      \u6bcf\u6b21\u5237\u76d8 redo log \u8bb0\u5f55\u5230\u65e5\u5fd7\u6587\u4ef6\u7ec4\u4e2d\uff0cwrite pos \u4f4d\u7f6e\u5c31\u4f1a\u540e\u79fb\u66f4\u65b0\u3002\u6bcf\u6b21 MySQL \u52a0\u8f7d\u65e5\u5fd7\u6587\u4ef6\u7ec4\u6062\u590d\u6570\u636e\u65f6\uff0c\u4f1a\u6e05\u7a7a\u52a0\u8f7d\u8fc7\u7684 redo log \u8bb0\u5f55\uff0c\u5e76\u628a checkpoint \u540e\u79fb\u66f4\u65b0\u3002write pos \u548c checkpoint \u4e4b\u95f4\u7684\u8fd8\u7a7a\u7740\u7684\u90e8\u5206\u53ef\u7528\u6765\u5199\u5165\u65b0\u7684 redo log \u8bb0\u5f55\u3002<\/p>\n\n\n\n
      \u5982\u679c write pos \u8ffd\u4e0a checkpoint\uff0c\u8868\u793a\u65e5\u5fd7\u6587\u4ef6\u7ec4\u6ee1\u4e86\uff0c\u8fd9\u65f6\u5019\u4e0d\u80fd\u518d\u5199\u5165\u65b0\u7684 redo log \u8bb0\u5f55\uff0cMySQL \u5f97\u505c\u4e0b\u6765\uff0c\u6e05\u7a7a\u4e00\u4e9b\u8bb0\u5f55\uff0c\u628a checkpoint \u63a8\u8fdb\u4e00\u4e0b\u3002<\/p>\n\n\n\n
      \n
       \u76f8\u4fe1\u5927\u5bb6\u90fd\u77e5\u9053redolog\u7684\u4f5c\u7528\u548c\u5b83\u7684\u5237\u76d8\u65f6\u673a\u3001\u5b58\u50a8\u5f62\u5f0f\uff1a
      InnoDB\u7684\u66f4\u65b0\u64cd\u4f5c\u91c7\u7528\u7684\u662fWriteAheadLog\uff08\u9884\u5148\u65e5\u5fd7\u6301\u4e45\u5316\uff09\u7b56\u7565\uff0c\u5373\u5148\u5199\u65e5\u5fd7\uff0c\u518d\u5199\u5165\u78c1\u76d8\u3002<\/p>\n<\/blockquote>\n\n\n\n
      \u00a0\"\"<\/p>\n\n\n\n
       2.Undo\u65e5\u5fd7<\/h1>\n\n\n\n
      redolog\u662f\u4e8b\u52a1\u6301\u4e45\u6027\u7684\u4fdd\u8bc1\uff0cundolog\u662f\u4e8b\u52a1\u539f\u5b50\u6027\u7684\u4fdd\u8bc1\u3002\u5728\u4e8b\u52a1\u4e2d\u66f4\u65b0\u6570\u636e\u7684\u524d\u7f6e\u64cd\u4f5c\u5176\u5b9e\u662f\u8981\u5148\u5199\u5165\u4e00\u4e2aundo log\u3002<\/p>\n\n\n\n
       \u6709\u65f6\u4e8b\u52a1\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9519\u8bef\uff0c\u6bd4\u5982\uff0c\u60c5\u51b5\u4e00\uff1a\u4e8b\u52a1\u6267\u884c\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u9047\u5230\u5404\u79cd\u9519\u8bef\uff0c\u6bd4\u5982\u670d\u52a1\u5668\u672c\u8eab\u7684\u9519\u8bef\uff0c\u64cd\u4f5c\u7cfb\u7edf\u9519\u8bef\uff0c\u751a\u81f3\u662f\u7a81\u7136\u65ad\u7535\u5bfc\u81f4\u7684\u9519\u8bef\u3002
      \u60c5\u51b5\u4e8c\uff1a\u7a0b\u5e8f\u5458\u53ef\u4ee5\u5728\u4e8b\u52a1\u6267\u884c\u8fc7\u7a0b\u4e2d\u624b\u52a8\u8f93\u5165ROLLBACK\u8bed\u53e5\u7ed3\u675f\u5f53\u524d\u4e8b\u52a1\u7684\u6267\u884c\u3002<\/p>\n\n\n\n
       \u6bcf\u5f53\u6211\u4eec\u8981\u5bf9\u4e00\u6761\u8bb0\u5f55\u505a\u6539\u52a8\u65f6\uff08\u8fd9\u91cc\u7684\u6539\u52a8\u53ef\u4ee5\u6307INSERT\u3001DELETE\u3001UPDATE\uff09\uff0c\u90fd\u9700\u8981\"\u7559\u4e00\u624b\"-\u4e00\u628a\u56de\u6eda\u65f6\u6240\u9700\u7684\u4e1c\u897f\u8bb0\u4e0b\u6765\u3002\u6bd4\u5982\uff1a<\/p>\n\n\n\n
        \n
      • \u00b7\u4f60\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\u65f6\uff0c\u81f3\u5c11\u8981\u628a\u8fd9\u6761\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\u8bb0\u4e0b\u6765\uff0c\u4e4b\u540e\u56de\u6eda\u7684\u65f6\u5019\u53ea\u9700\u8981\u628a\u8fd9\u4e2a\u4e3b\u952e\u503c\u5bf9\u5e94\u7684\u8bb0\u5f55\u5220\u6389\u5c31\u597d\u4e86\u3002\uff08\u5bf9\u4e8e\u6bcf\u4e2aINSERT\uff0cInnoDB\u5b58\u50a8\u5f15\u64ce\u4f1a\u5b8c\u6210\u4e00\u4e2aDELETE\uff09<\/li>\n\n\n\n
      • \u00b7\u4f60\u5220\u9664\u4e86\u4e00\u6761\u8bb0\u5f55\uff0c\u81f3\u5c11\u8981\u628a\u8fd9\u6761\u8bb0\u5f55\u4e2d\u7684\u5185\u5bb9\u90fd\u8bb0\u4e0b\u6765\uff0c\u8fd9\u6837\u4e4b\u540e\u56de\u6eda\u65f6\u518d\u628a\u7531\u8fd9\u4e9b\u5185\u5bb9\u7ec4\u6210\u7684\u8bb0\u5f55\u63d2\u5165\u5230\u8868\u4e2d\u5c31\u597d\u4e86\u3002\uff08\u5bf9\u4e8e\u6bcf\u4e2aDELETE\uff0cInnoDB\u5b58\u50a8\u5f15\u64ce\u4f1a\u6267\u884c\u4e00\u4e2aINSERT\uff09<\/li>\n\n\n\n
      • \u00b7\u4f60\u4fee\u6539\u4e86\u4e00\u6761\u8bb0\u5f55\uff0c\u81f3\u5c11\u8981\u628a\u4fee\u6539\u8fd9\u6761\u8bb0\u5f55\u524d\u7684\u65e7\u503c\u90fd\u8bb0\u5f55\u4e0b\u6765\uff0c\u8fd9\u6837\u4e4b\u540e\u56de\u6eda\u65f6\u518d\u628a\u8fd9\u6761\u8bb0\u5f55\u66f4\u65b0\u4e3a\u65e7\u503c\u5c31\u597d\u4e86\u3002\uff08\u5bf9\u4e8e\u6bcf\u4e2aUPDATE\uff0cInnoDB\u5b58\u50a8\u5f15\u64ce\u4f1a\u6267\u884c\u4e00\u4e2a\u76f8\u53cd\u7684UPDATE\uff0c\u5c06\u4fee\u6539\u524d\u7684\u884c\u653e\u56de\u53bb\uff09<\/li>\n<\/ul>\n\n\n\n
        MySQL\u628a\u8fd9\u4e9b\u4e3a\u4e86\u56de\u6eda\u800c\u8bb0\u5f55\u7684\u8fd9\u4e9b\u5185\u5bb9\u79f0\u4e4b\u4e3a\u64a4\u9500\u65e5\u5fd7\u6216\u8005\u56de\u6eda\u65e5\u5fd7\uff08\u5373undo log\uff09\u3002\u6ce8\u610f\uff0c\u7531\u4e8e\u67e5\u8be2\u64cd\u4f5c\uff08SELECT\uff09\u5e76\u4e0d\u4f1a\u4fee\u6539\u4efb\u4f55\u7528\u6237\u8bb0\u5f55\uff0c\u6240\u4ee5\u5728\u67e5\u8be2\u64cd\u4f5c\u6267\u884c\u65f6\uff0c\u5e76\u4e0d\u9700\u8981\u8bb0\u5f55\u76f8\u5e94\u7684undo\u65e5\u5fd7\u3002
        \u6b64\u5916\uff0cundolog\u4f1a\u4ea7\u751fredo log\uff0c\u4e5f\u5c31\u662fundo log\u7684\u4ea7\u751f\u4f1a\u4f34\u968f\u7740redo log\u7684\u4ea7\u751f\uff0c\u8fd9\u662f\u56e0\u4e3aundo  log\u4e5f\u9700\u8981\u6301\u4e45\u6027\u7684\u4fdd\u62a4\u3002<\/p>\n\n\n\n
        2.2 Undo\u65e5\u5fd7\u7684\u4f5c\u7528<\/h3>\n\n\n\n
        \u00b7\u4f5c\u75281\uff1a\u56de\u6eda\u6570\u636e
        \u7528\u6237\u5bf9undo\u65e5\u5fd7\u53ef\u80fd\u6709\u8bef\u89e3\uff1aundo\u7528\u4e8e\u5c06\u6570\u636e\u5e93\u7269\u7406\u5730\u6062\u590d\u5230\u6267\u884c\u8bed\u53e5\u6216\u4e8b\u52a1\u4e4b\u524d\u7684\u6837\u5b50\u3002\u4f46\u4e8b\u5b9e\u5e76\u975e\u5982\u6b64\u3002undo\u662f\u903b\u8f91\u65e5\u5fd7\uff0c\u56e0\u6b64\u53ea\u662f\u5c06\u6570\u636e\u5e93\u903b\u8f91\u5730\u6062\u590d\u5230\u539f\u6765\u7684\u6837\u5b50\u3002\u6240\u6709\u4fee\u6539\u90fd\u88ab\u903b\u8f91\u5730\u53d6\u6d88\u4e86\uff0c\u4f46\u662f\u6570\u636e\u7ed3\u6784\u548c\u9875\u672c\u8eab\u5728\u56de\u6eda\u4e4b\u540e\u53ef\u80fd\u5927\u4e0d\u76f8\u540c\u3002
        \u8fd9\u662f\u56e0\u4e3a\u5728\u591a\u7528\u6237\u5e76\u53d1\u7cfb\u7edf\u4e2d\uff0c\u53ef\u80fd\u4f1a\u6709\u6570\u5341\u3001\u6570\u767e\u751a\u81f3\u6570\u5e72\u4e2a\u5e76\u53d1\u4e8b\u52a1\u3002\u6570\u636e\u5e93\u7684\u4e3b\u8981\u4efb\u52a1\u5c31\u662f\u534f\u8c03\u5bf9\u6570\u636e\u8bb0\u5f55\u7684\u5e76\u53d1\u8bbf\u95ee\u3002\u6bd4\u5982\uff0c\u4e00\u4e2a\u4e8b\u52a1\u5728\u4fee\u6539\u5f53\u524d\u4e00\u4e2a\u9875\u4e2d\u67d0\u51e0\u6761\u8bb0\u5f55\uff0c\u540c\u65f6\u8fd8\u6709\u522b\u7684\u4e8b\u52a1\u5728\u5bf9\u540c\u4e00\u4e2a\u9875\u4e2d\u53e6\u51e0\u6761\u8bb0\u5f55\u8fdb\u884c\u4fee\u6539\u3002\u56e0\u6b64\uff0c\u4e0d\u80fd\u5c06\u4e00\u4e2a\u9875\u56de\u6eda\u5230\u4e8b\u52a1\u5f00\u59cb\u7684\u6837\u5b50\uff0c\u56e0\u4e3a\u8fd9\u6837\u4f1a\u5f71\u54cd\u5176\u4ed6\u4e8b\u52a1\u6b63\u5728\u8fdb\u884c\u7684\u5de5\u4f5c\u3002<\/p>\n\n\n\n
        \u00b7\u4f5c\u75282\uff1aMVCC
        undo\u7684\u53e6\u4e00\u4e2a\u4f5c\u7528\u662fMVCC\uff0c\u5373\u5728InnocIB\u5b58\u50a8\u5f15\u5f15\u64ce\u4e2dMVcc\u7684\u5b9e\u73b0\u662f\u901a\u8fc7undo\u6765\u5b8c\u6210\u3002\u5f53\u7528\u6237\u8bfb\u53d6\u4e00\u884c\u8bb0\u5f55\u65f6\uff0c\u82e5\u5360\u7528\u4ee5\u6b64\u5b9e\u73b0\u975e\u9501\u5b9a\u8bfb\u53d6<\/p>\n\n\n\n
         2.3 undo\u7684\u5b58\u50a8\u7ed3\u6784<\/h3>\n\n\n\n
        1.\u56de\u6eda\u6bb5\u4e0eundo\u9875<\/h4>\n\n\n\n
        InnoDB\u5bf9undo log\u7684\u7ba1\u7406\u91c7\u7528\u6bb5\u7684\u65b9\u5f0f\uff0c\u4e5f\u5c31\u662f\u56de\u6eda\u6bb5\uff08rollback segment\uff09\u3002\u6bcf\u4e2a\u56de\u6eda\u6bb5\u8bb0\u5f55\u4e861024\u4e2aundo log segment\uff0c\u800c\u5728\u6bcf\u4e2aundo log segment\u6bb5\u4e2d\u8fdb\u884cundo\u9875\u7684\u7533\u8bf7\u3002<\/p>\n\n\n\n
        - \u5728InnoDB1.1\u7248\u672c\u4e4b\u524d\uff08\u4e0d\u5305\u62ec1.1\u7248\u672c\uff09\uff0c\u53ea\u6709\u4e00\u4e2arollback segment\uff0c\u56e0\u6b64\u652f\u6301\u540c\u65f6\u5728\u7ebf\u7684\u4e8b\u52a1\u9650\u5236\u4e3a1024\u3002\u867d\u7136\u5bf9\u7edd\u5927\u591a\u6570\u7684\u5e94\u7528\u6765\u8bf4\u90fd\u5df2\u7ecf\u591f\u7528\u3002
        - \u4ece1.1\u7248\u672c\u5f00\u59cbInnoDB\u652f\u6301\u6700\u5927128\u4e2arollback segment\uff0c\u6545\u5176\u652f\u6301\u540c\u65f6\u5728\u7ebf\u7684\u4e8b\u52a1\u9650\u5236\u63d0\u9ad8\u5230\u4e86128*1024\u3002<\/p>\n\n\n\n
        mysql> show variables like 'innodb_undo_logs';
        +----------------------+-------+
        | Variable_name       | Value |
        +----------------------+-------+
        | innodb_undo_logs    | 128   |
        +----------------------+-------+<\/p>\n\n\n\n
        \u867d\u7136InnoDB1.1\u7248\u672c\u652f\u6301\u4e86128\u4e2arollback segment\uff0c\u4f46\u662f\u8fd9\u4e9brollback segment\u90fd\u5b58\u50a8\u4e8e\u5171\u4eab\u8868\u7a7a\u95f4ibdata\u4e2d\u3002\u4eceInnoDB1.2\u7248\u672c\u5f00\u59cb\uff0c\u53ef\u901a\u8fc7\u53c2\u6570\u5bf9rollback segment\u505a\u8fdb\u4e00\u6b65\u7684\u8bbe\u7f6e\u3002\u8fd9\u4e9b\u53c2\u6570\u5305\u62ec\uff1a<\/p>\n\n\n\n
        - innodb_undo_directory\uff1a\u8bbe\u7f6erollback segment\u6587\u4ef6\u6240\u5728\u7684\u8def\u5f84\u3002\u8fd9\u610f\u5473\u7740rollback segment\u53ef\u4ee5\u5b58\u653e\u5728\u5171\u4eab\u8868\u7a7a\u95f4\u4ee5\u5916\u7684\u4f4d\u7f6e\uff0c\u5373\u53ef\u4ee5\u8bbe\u7f6e\u4e3a\u72ec\u7acb\u8868\u7a7a\u95f4\u3002\u8be5\u53c2\u6570\u7684\u9ed8\u8ba4\u503c\u4e3a\u201c\/\u201d\uff0c\u8868\u793a\u5f53\u524dInnoDB\u5b58\u50a8\u5f15\u64ce\u7684\u76ee\u5f55\u3002
        - innodb_undo_logs\uff1a\u8bbe\u7f6erollback segment\u7684\u4e2a\u6570\uff0c\u9ed8\u8ba4\u503c\u4e3a128\u3002\u5728InnoDB1.2\u7248\u672c\u4e2d\uff0c\u8be5\u53c2\u6570\u7528\u6765\u66ff\u6362\u4e4b\u524d\u7248\u672c\u7684\u53c2\u6570innodb_rollback_segments\u3002
        - innodb_undo_tablespaces\uff1a\u8bbe\u7f6e\u6784\u6210rollback segment\u6587\u4ef6\u7684\u6570\u91cf\uff0c\u8fd9\u6837rollback segment\u53ef\u4ee5\u8f83\u4e3a\u5e73\u5747\u5730\u5206\u5e03\u5728\u591a\u4e2a\u6587\u4ef6\u4e2d\u3002\u8bbe\u7f6e\u8be5\u53c2\u6570\u540e\uff0c\u4f1a\u5728\u8def\u5f84innodb_undo_directory\u770b\u5230undo\u4e3a\u524d\u7f00\u7684\u6587\u4ef6\uff0c\u8be5\u6587\u4ef6\u5c31\u4ee3\u8868rollback segment\u6587\u4ef6\u3002<\/p>\n\n\n\n
        undo log\u76f8\u5173\u53c2\u6570\u4e00\u822c\u5f88\u5c11\u6539\u52a8\u3002<\/p>\n\n\n\n
        undo\u5982\u4f55\u91cd\u7528\uff1f<\/h4>\n\n\n\n
         \u5f53\u6211\u4eec\u5f00\u542f\u4e00\u4e2a\u4e8b\u52a1\u9700\u8981\u5199undolog\u7684\u65f6\u5019\uff0c\u5c31\u5f97\u5148\u53bbundologsegment\u4e2d\u53bb\u627e\u5230\u4e00\u4e2a\u7a7a\u95f2\u7684\u4f4d\u7f6e\uff0c\u5f53\u6709\u7a7a\u4f4d\u7684\u65f6\u5019\uff0c\u5c31\u53bb\u7533\u8bf7undo\u9875\uff0c\u5728\u8fd9\u4e2a\u7533\u8bf7\u5230\u7684undo\u9875\u4e2d\u8fdb\u884cundolog\u7684\u5199\u5165\u3002\u6211\u4eec\u77e5\u9053mysq\u9ed8\u8ba4\u4e00\u9875\u7684\u5927\u5c0f\u662f16k\u3002<\/p>\n\n\n\n
        \u4e3a\u6bcf\u4e00\u4e2a\u4e8b\u52a1\u5206\u914d\u4e00\u4e2a\u9875\uff0c\u662f\u975e\u5e38\u6d6a\u8d39\u7684\uff08\u9664\u975e\u4f60\u7684\u4e8b\u52a1\u975e\u5e38\u957f\uff09\uff0c\u5047\u8bbe\u4f60\u7684\u5e94\u7528\u7684TPS\uff08\u6bcf\u79d2\u5904\u7406\u7684\u4e8b\u52a1\u6570\u76ee\uff09\u4e3a1000\uff0c\u90a3\u4e481s\u5c31\u9700\u89811000\u4e2a\u9875\uff0c\u5927\u6982\u9700\u898116M\u7684\u5b58\u50a8\uff0c1\u5206\u949f\u5927\u6982\u9700\u89811G\u7684\u5b58\u50a8\u3002\u5982\u679c\u7167\u8fd9\u6837\u4e0b\u53bb\u9664\u975eMySQL\u6e05\u7406\u7684\u975e\u5e38\u52e4\u5feb\uff0c\u5426\u5219\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\uff0c\u78c1\u76d8\u7a7a\u95f4\u4f1a\u589e\u957f\u7684\u975e\u5e38\u5feb\uff0c\u800c\u4e14\u5f88\u591a\u7a7a\u95f4\u90fd\u662f\u6d6a\u8d39\u7684\u3002<\/p>\n\n\n\n
        \u4e8e\u662fundo\u9875\u5c31\u88ab\u80a1\u8ba1\u7684\u53ef\u4ee5\u91cd\u7528\u4e86\uff0c\u5f53\u4e8b\u52a1\u63d0\u4ea4\u65f6\uff0c\u5e76\u4e0d\u4f1a\u7acb\u523b\u5220\u9664undo\u9875\u3002\u56e0\u4e3a\u91cd\u7528\uff0c\u6240\u4ee5\u8fd9\u4e2aundo\u9875\u53ef\u80fd\u6df7\u6742\u7740\u5176\u4ed6\u4e8b\u52a1\u7684undolog\u3002undolog\u5728commit\u540e\uff0c\u4f1a\u88ab\u653e\u5230\u4e00\u4e2a\u94fe\u8868\u4e2d\uff0c\u7136\u540e\u5224\u65adundo\u9875\u7684\u4f7f\u7528\u7a7a\u95f4\u662f\u5426\u5c0f\u4e8e3\/4\uff0c\u5982\u679c\u5c0f\u4e8e3\/4\u7684\u8bdd\uff0c\u5219\u8868\u793a\u5f53\u524d\u7684undo\u9875\u53ef\u4ee5\u88ab\u91cd\u7528\uff0c\u90a3\u4e48\u5b83\u5c31\u4e0d\u4f1a\u88ab\u56de\u6536\uff0c\u5176\u4ed6\u4e8b\u52a1\u7684undolog\u53ef\u4ee5\u8bb0\u5f55\u5728\u5f53\u524dundo\u9875\u7684\u540e\u9762\u3002\u7531\u4e8eundolog\u662f\u79bb\u6563\u7684\uff0c\u6240\u4ee5\u6e05\u7406\u5bf9\u5e94\u7684\u78c1\u76d8\u7a7a\u95f4\u65f6\uff0c\u6548\u7387\u4e0d\u9ad8\u3002<\/p>\n\n\n\n
        \u80cc\u4e5f\u4e0d\u7528\u80cc\u7684\u5f88\u7ec6\uff0c\u53cd\u6b63\u5927\u591a\u6570\u9762\u8bd5\u5b98\u90fd\u8fd8\u6ca1\u90a3\u4e48\u7ec6\uff0c\u7279\u522b\u8fd9\u91cc\u7684\u5b58\u50a8\u7ed3\u6784\u5565\u7684\uff0c\u53ea\u9700\u8981\u77e5\u9053\u600e\u4e48\u56de\u6eda\u7684\uff0c\u56de\u6eda\u6d89\u53ca\u5230\u4ec0\u4e48\u5927\u7684\u65b9\u9762\u5c31\u53ef\u4ee5\u4e86<\/p>\n\n\n\n
        \"\"\"\"<\/p>\n\n\n\n
         3. \u56de\u6eda\u6bb5\u4e2d\u7684\u6570\u636e\u5206\u7c7b<\/h4>\n\n\n\n
        \u4e8b\u52a1\u63d0\u4ea4\u540e\u5e76\u4e0d\u80fd\u9a6c\u4e0a\u5220\u9664undo log\u53caundo log\u6240\u5728\u7684\u9875\u3002\u8fd9\u662f\u56e0\u4e3a\u53ef\u80fd\u8fd8\u6709\u5176\u4ed6\u4e8b\u52a1\u9700\u8981\u901a\u8fc7undo log\u6765\u5f97\u5230\u884c\u8bb0\u5f55\u4e4b\u524d\u7684\u7248\u672c\u3002\u6545\u4e8b\u52a1\u63d0\u4ea4\u65f6\u5c06undo log\u653e\u5165\u4e00\u4e2a\u94fe\u8868\u4e2d\uff0c\u662f\u5426\u53ef\u4ee5\u6700\u7ec8\u5220\u9664undo log\u53caundo log\u6240\u5728\u9875\u7531purge\u7ebf\u7a0b\u6765\u5224\u65ad\u3002<\/p>\n\n\n\n
        2.4 undo\u7684\u7c7b\u578b<\/h3>\n\n\n\n
          \n
        • \u672a\u63d0\u4ea4\u7684\u56de\u6eda\u6570\u636e(uncommitted undo information)<\/code>\u00a0\u8be5\u6570\u636e\u6240\u5173\u8054\u7684\u4e8b\u52a1\u5e76\u672a\u63d0\u4ea4\uff0c\u7528\u4e8e\u5b9e\u73b0\u8bfb\u4e00\u81f4\u6027\uff0c\u6240\u4ee5\u8be5\u6570\u636e\u4e0d\u80fd\u88ab\u5176\u4ed6\u4e8b\u52a1\u7684\u6570\u636e\u8986\u76d6\u3002<\/li>\n\n\n\n
        • \u5df2\u7ecf\u63d0\u4ea4\u4f46\u672a\u8fc7\u671f\u7684\u56de\u6eda\u6570\u636e(committed undo information)\u00a0<\/code> \u8be5\u6570\u636e\u5173\u8054\u7684\u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\uff0c\u4f46\u662f\u4ecd\u53d7\u5230undo retention\u53c2\u6570\u7684\u4fdd\u6301\u65f6\u95f4\u7684\u5f71\u54cd\u3002<\/li>\n\n\n\n
        • \u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\u5e76\u8fc7\u671f\u7684\u6570\u636e(expired undo information)\u00a0<\/code> \u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\uff0c\u800c\u4e14\u6570\u636e\u4fdd\u5b58\u65f6\u95f4\u5df2\u7ecf\u8d85\u8fc7undo retention\u53c2\u6570\u6307\u5b9a\u7684\u65f6\u95f4\uff0c\u5c5e\u4e8e\u5df2\u7ecf\u8fc7\u671f\u7684\u6570\u636e\u3002\u5f53\u56de\u6eda\u6bb5\u6ee1\u4e86\u4e4b\u540e\uff0c\u4f1a\u4f18\u5148\u8986\u76d6\"\u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\u5e76\u8fc7\u671f\u7684\u6570\u636e\"\u3002<\/li>\n<\/ul>\n\n\n\n
          \u5728InnoDB\u5b58\u50a8\u5f15\u64ce\u4e2d\uff0cundo log\u5206\u4e3a\uff1a<\/p>\n\n\n\n
            \n
          • insert undo log insert undo log\u662f\u6307\u5728insert\u64cd\u4f5c\u4e2d\u4ea7\u751f\u7684undo log\u3002\u56e0\u4e3ainsert\u64cd\u4f5c\u7684\u8bb0\u5f55\uff0c\u53ea\u5bf9\u4e8b\u52a1\u672c\u8eab\u53ef\u89c1\uff0c\u5bf9\u5176\u4ed6\u4e8b\u52a1\u4e0d\u53ef\u89c1(\u8fd9\u662f\u4e8b\u52a1\u9694\u79bb\u6027\u7684\u8981\u6c42)\uff0c\u6545\u8be5undo log\u53ef\u4ee5\u5728\u4e8b\u52a1\u63d0\u4ea4\u540e\u76f4\u63a5\u5220\u9664\u3002\u4e0d\u9700\u8981\u8fdb\u884cpurge\u64cd\u4f5c\u3002<\/li>\n\n\n\n
          • update undo log update undo log\u8bb0\u5f55\u7684\u662f\u5bf9delete\u548cupdate\u64cd\u4f5c\u4ea7\u751f\u7684undo log\u3002\u8be5undo log\u53ef\u80fd\u9700\u8981\u63d0\u4f9bMVCC\u673a\u5236\uff0c\u56e0\u6b64\u4e0d\u80fd\u5728\u4e8b\u52a1\u63d0\u4ea4\u65f6\u5c31\u8fdb\u884c\u5220\u9664\u3002\u63d0\u4ea4\u65f6\u653e\u5165undo log\u94fe\u8868\uff0c\u7b49\u5f85purge\u7ebf\u7a0b\u8fdb\u884c\u6700\u540e\u7684\u5220\u9664\u3002<\/li>\n<\/ul>\n\n\n\n
            2.5 undo log\u7684\u751f\u547d\u5468\u671f<\/h3>\n\n\n\n
            1\uff09\u7b80\u8981\u751f\u6210\u8fc7\u7a0b<\/h4>\n\n\n\n
            \u4ee5\u4e0b\u662fundo+redo\u4e8b\u52a1\u7684\u7b80\u5316\u8fc7\u7a0b<\/p>\n\n\n\n
            \u5047\u8bbe\u67092\u4e2a\u6570\u503c\uff0c\u5206\u522b\u4e3aA=1\u548cB=2\uff0c\u7136\u540e\u5c06A\u4fee\u6539\u4e3a3\uff0cB\u4fee\u6539\u4e3a4<\/p>\n\n\n\n
            1. start transaction;\n2\uff0e\u8bb0\u5f55A=1\u5230undo log;\n3. update A = 3;\n4\uff0e\u8bb0\u5f55A=3 \u5230redo log;\n5\uff0e\u8bb0\u5f55 B=2\u5230undo loq;\n6. update B = 4;\n7\uff0e\u8bb0\u5f55B = 4\u5230redo log;\n8\uff0e\u5c06redo log\u5237\u65b0\u5230\u78c1\u76d8;\n9. commit<\/code><\/pre>\n\n\n\n
            \u57281-8\u6b65\u9aa4\u7684\u4efb\u610f\u4e00\u6b65\u7cfb\u7edf\u5b95\u673a\uff0c\u4e8b\u52a1\u672a\u63d0\u4ea4\uff0c\u8be5\u4e8b\u52a1\u5c31\u4e0d\u4f1a\u5bf9\u78c1\u76d8\u4e0a\u7684\u6570\u636e\u505a\u4efb\u4f55\u5f71\u54cd\u3002<\/p>\n\n\n\n
            \u5982\u679c\u57288-9\u4e4b\u95f4\u5b95\u673a\u3002<\/p>\n\n\n\n
              \n
            • redo log \u8fdb\u884c\u6062\u590d<\/li>\n\n\n\n
            • \u6216\u8005\u53ef\u4ee5undo log \u53d1\u73b0\u6709\u4e8b\u52a1\u6ca1\u5b8c\u6210\u8fdb\u884c\u56de\u6eda\u3002redo log\u5df2\u7ecf\u6301\u4e45\u5316\uff0c\u53ef\u4ee5\u9009\u62e9\u7ee7\u7eed\u5b8c\u6210\u4e8b\u52a1\u63d0\u4ea4<\/li>\n\n\n\n
            • \u7b2c\u516b\u6b65\u662f\u5237\u7684redolog file\uff0crollback\u64cd\u4f5c\u4e5f\u4f1a\u4ea7\u751fredolog\uff0c\u8fd9\u91cc\u5176\u5b9e\u5c31\u662f\u987a\u5e8f\u6267\u884credolog\u5c31\u53ef\u4ee5\u5b9e\u73b0\u6b63\u786e\u7684\u56de\u6eda\u3002<\/li>\n<\/ul>\n\n\n\n
              \u82e5\u57289\u4e4b\u540e\u7cfb\u7edf\u5b95\u673a\uff0c\u5185\u5b58\u6620\u5c04\u4e2d\u53d8\u66f4\u7684\u6570\u636e\u8fd8\u6765\u4e0d\u53ca\u5237\u56de\u78c1\u76d8\uff0c\u90a3\u4e48\u7cfb\u7edf\u6062\u590d\u4e4b\u540e\uff0c\u53ef\u4ee5\u6839\u636eredo log\u628a\u6570\u636e\u5237\u56de\u78c1\u76d8\u3002<\/p>\n\n\n\n
              \"\"\"\"<\/p>\n\n\n\n
              2\uff09\u8be6\u7ec6\u751f\u6210\u8fc7\u7a0b<\/h4>\n\n\n\n
              \u5bf9\u4e8eInnoDB\u5f15\u64ce\u6765\u8bf4\uff0c\u6bcf\u4e2a\u884c\u8bb0\u5f55\u9664\u4e86\u8bb0\u5f55\u672c\u8eab\u7684\u6570\u636e\u4e4b\u5916\uff0c\u8fd8\u6709\u51e0\u4e2a\u9690\u85cf\u7684\u5217:<\/p>\n\n\n\n
                \n
              • DB_ROW_ID<\/code>: \u5982\u679c\u6ca1\u6709\u4e3a\u8868\u663e\u5f0f\u7684\u5b9a\u4e49\u4e3b\u952e\uff0c\u5e76\u4e14\u8868\u4e2d\u4e5f\u6ca1\u6709\u5b9a\u4e49\u552f\u4e00\u7d22\u5f15\uff0c\u90a3\u4e48InnoDB\u4f1a\u81ea\u52a8\u4e3a\u8868\u6dfb\u52a0\u4e00\u4e2arow_id\u7684\u9690\u85cf\u5217\u4f5c\u4e3a\u4e3b\u952e\u3002<\/li>\n\n\n\n
              • DB_TRX_ID<\/code>\ufe30\u6bcf\u4e2a\u4e8b\u52a1\u90fd\u4f1a\u5206\u914d\u4e00\u4e2a\u4e8b\u52a1ID\uff0c\u5f53\u5bf9\u67d0\u6761\u8bb0\u5f55\u53d1\u751f\u53d8\u66f4\u65f6\uff0c\u5c31\u4f1a\u5c06\u8fd9\u4e2a\u4e8b\u52a1\u7684\u4e8b\u52a1ID\u5199\u5165trx_id\u4e2d\u3002<\/li>\n\n\n\n
              • DB_ROLL_PTR<\/code>:\u56de\u6eda\u6307\u9488\uff0c\u672c\u8d28\u4e0a\u5c31\u662f\u6307\u5411undo log\u7684\u6307\u9488\u3002<\/li>\n<\/ul>\n\n\n\n
                \"\"<\/p>\n\n\n\n
                \u5f53\u6211\u4eec\u6267\u884cINSERT\u65f6\uff1a<\/strong><\/p>\n\n\n\n
                begin; \nINSERT INTO user (name) VALUES (\"tom\");\n<\/code><\/pre>\n\n\n\n
                \u63d2\u5165\u7684\u6570\u636e\u90fd\u4f1a\u751f\u6210\u4e00\u6761insert undo log\uff0c\u5e76\u4e14\u6570\u636e\u7684\u56de\u6eda\u6307\u9488\u4f1a\u6307\u5411\u5b83\u3002undo log\u4f1a\u8bb0\u5f55undo log\u7684\u5e8f\u53f7\u3001\u63d2\u5165\u4e3b\u952e\u7684\u5217\u548c\u503c...\uff0c\u90a3\u4e48\u5728\u8fdb\u884crollback\u7684\u65f6\u5019\uff0c\u901a\u8fc7\u4e3b\u952e\u76f4\u63a5\u628a\u5bf9\u5e94\u7684\u6570\u636e\u5220\u9664\u5373\u53ef\u3002<\/p>\n\n\n\n
                \"\"<\/p>\n\n\n\n
                \u5f53\u6211\u4eec\u6267\u884cUPDATE\u65f6\uff1a<\/strong><\/p>\n\n\n\n
                \u5bf9\u4e8e\u66f4\u65b0\u7684\u64cd\u4f5c\u4f1a\u4ea7\u751fupdate undo log\uff0c\u5e76\u4e14\u4f1a\u5206\u66f4\u65b0\u4e3b\u952e\u7684\u548c\u4e0d\u66f4\u65b0\u4e3b\u952e\u7684\uff0c\u5047\u8bbe\u73b0\u5728\u6267\u884c:<\/p>\n\n\n\n
                UPDATE user SET name= \"Sun\" WHERE id=1;\n<\/code><\/pre>\n\n\n\n
                <\/p>\n\n\n\n
                \"\"<\/p>\n\n\n\n
                \u8fd9\u65f6\u4f1a\u628a\u8001\u7684\u8bb0\u5f55\u5199\u5165\u65b0\u7684undo log\uff0c\u8ba9\u56de\u6eda\u6307\u9488\u6307\u5411\u65b0\u7684undo log\uff0c\u5b83\u7684undo no\u662f1\uff0c\u5e76\u4e14\u65b0\u7684undo log\u4f1a\u6307\u5411\u8001\u7684undo log (undo no=0)\u3002<\/p>\n\n\n\n
                \u5047\u8bbe\u73b0\u5728\u6267\u884c:<\/p>\n\n\n\n
                \"\"<\/figure>\n\n\n\n
                \u5bf9\u4e8e\u66f4\u65b0\u4e3b\u952e\u7684\u64cd\u4f5c\uff0c\u4f1a\u5148\u628a\u539f\u6765\u7684\u6570\u636edeletemark\u6807\u8bc6\u6253\u5f00\uff0c\u8fd9\u65f6\u5e76\u6ca1\u6709\u771f\u6b63\u7684\u5220\u9664\u6570\u636e\uff0c\u771f\u6b63\u7684\u5220\u9664\u4f1a\u4ea4\u7ed9\u6e05\u7406\u7ebf\u7a0b\u53bb\u5224\u65ad\uff0c\u7136\u540e\u5728\u540e\u9762\u63d2\u5165\u4e00\u6761\u65b0\u7684\u6570\u636e\uff0c\u65b0\u7684\u6570\u636e\u4e5f\u4f1a\u4ea7\u751fundo log\uff0c\u5e76\u4e14undo log\u7684\u5e8f\u53f7\u4f1a\u9012\u589e\u3002<\/p>\n\n\n\n
                \u53ef\u4ee5\u53d1\u73b0\u6bcf\u6b21\u5bf9\u6570\u636e\u7684\u53d8\u66f4\u90fd\u4f1a\u4ea7\u751f\u4e00\u4e2aundo log\uff0c\u5f53\u4e00\u6761\u8bb0\u5f55\u88ab\u53d8\u66f4\u591a\u6b21\u65f6\uff0c\u90a3\u4e48\u5c31\u4f1a\u4ea7\u751f\u591a\u6761undo log,undo log\u8bb0\u5f55\u7684\u662f\u53d8\u66f4\u524d\u7684\u65e5\u5fd7\uff0c\u5e76\u4e14\u6bcf\u4e2aundo log\u7684\u5e8f\u53f7\u662f\u9012\u589e\u7684\uff0c\u90a3\u4e48\u5f53\u8981\u56de\u6eda\u7684\u65f6\u5019\uff0c\u6309\u7167\u5e8f\u53f7\u4f9d\u6b21\u5411\u524d\u63a8<\/code>\uff0c\u5c31\u53ef\u4ee5\u627e\u5230\u6211\u4eec\u7684\u539f\u59cb\u6570\u636e\u4e86\u3002<\/p>\n\n\n\n
                3\uff09undo log\u662f\u5982\u4f55\u56de\u6eda\u7684<\/h4>\n\n\n\n
                \u4ee5\u4e0a\u9762\u7684\u4f8b\u5b50\u6765\u8bf4\uff0c\u5047\u8bbe\u6267\u884crollback\uff0c\u90a3\u4e48\u5bf9\u5e94\u7684\u6d41\u7a0b\u5e94\u8be5\u662f\u8fd9\u6837\uff1a<\/p>\n\n\n\n
                \u901a\u8fc7undo no=3\u7684\u65e5\u5fd7\u628aid=2\u7684\u6570\u636e\u5220\u9664<\/p>\n\n\n\n
                \u901a\u8fc7undo no=2\u7684\u65e5\u5fd7\u628aid=1\u7684\u6570\u636e\u7684deletemark\u8fd8\u539f\u62100<\/p>\n\n\n\n
                \u901a\u8fc7undo no=1\u7684\u65e5\u5fd7\u628aid=1\u7684\u6570\u636e\u7684name\u8fd8\u539f\u6210Tom<\/p>\n\n\n\n
                \u901a\u8fc7undo no=0\u7684\u65e5\u5fd7\u628aid=1\u7684\u6570\u636e\u5220\u9664<\/p>\n\n\n\n
                4\uff09undo log\u7684\u5220\u9664<\/h4>\n\n\n\n
                  \n
                • \u9488\u5bf9\u4e8einsert undo log<\/li>\n<\/ul>\n\n\n\n
                  \u56e0\u4e3ainsert\u64cd\u4f5c\u7684\u8bb0\u5f55\uff0c\u53ea\u5bf9\u4e8b\u52a1\u672c\u8eab\u53ef\u89c1\uff0c\u5bf9\u5176\u4ed6\u4e8b\u52a1\u4e0d\u53ef\u89c1\u3002\u6545\u8be5undo log\u53ef\u4ee5\u5728\u4e8b\u52a1\u63d0\u4ea4\u540e\u76f4\u63a5\u5220\u9664\uff0c\u4e0d\u9700\u8981\u8fdb\u884cpurge\u64cd\u4f5c\u3002<\/p>\n\n\n\n
                    \n
                  • \u9488\u5bf9\u4e8eupdate undo log<\/li>\n<\/ul>\n\n\n\n
                    \u8be5undo log\u53ef\u80fd\u9700\u8981\u63d0\u4f9bMVCC\u673a\u5236\uff0c\u56e0\u6b64\u4e0d\u80fd\u5728\u4e8b\u52a1\u63d0\u4ea4\u65f6\u5c31\u8fdb\u884c\u5220\u9664\u3002\u63d0\u4ea4\u65f6\u653e\u5165undo log\u94fe\u8868\uff0c\u7b49\u5f85purge\u7ebf\u7a0b\u8fdb\u884c\u6700\u540e\u7684\u5220\u9664\u3002<\/p>\n\n\n\n
                    \n
                    \u8865\u5145:<\/p>\n\n\n\n
                    purge\u7ebf\u7a0b\u4e24\u4e2a\u4e3b\u8981\u4f5c\u7528\u662f:\u6e05\u7406undo\u9875<\/code>\u548c\u6e05\u9664page\u91cc\u9762\u5e26\u6709Delete_Bit\u6807\u8bc6\u7684\u6570\u636e<\/code>\u884c\u3002\u4ed5InnoDB\u4e2d\uff0c\u4e8b\u52a1\u4e2d\u7684Delete\u64cd\u4f5c\u5b9e\u9645\u4e0a\u5e76\u4e0d\u662f\u771f\u6b63\u7684\u5220\u9664\u6389\u6570\u636e\u884c\uff0c\u800c\u662f\u4e00\u79cdDelete Mark\u64cd\u4f5c\uff0c\u5728\u8bb0\u5f55\u4e0a\u6807\u8bc6Delete_Bit\uff0c\u800c\u4e0d\u5220\u9664\u8bb0\u5f55\u3002\u662f\u4e00\u79cd\"\u5047\u5220\u9664\"\u53ea\u662f\u505a\u4e86\u4e2a\u6807\u8bb0\uff0c\u771f\u6b63\u7684\u5220\u9664\u5de5\u4f5c\u9700\u8981\u540e\u53f0purge\u7ebf\u7a0b\u53bb\u5b8c\u6210\u3002<\/p>\n<\/blockquote>\n\n\n\n
                    2.6 \u5c0f\u7ed3<\/h3>\n\n\n\n
                    \"\"<\/p>\n\n\n\n
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                    <\/p>\n","protected":false},"excerpt":{"rendered":"
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