{"id":10006263,"date":"2022-08-21T05:39:27","date_gmt":"2022-08-20T21:39:27","guid":{"rendered":"https:\/\/ityet.com\/?p=10006263"},"modified":"2022-08-21T05:39:27","modified_gmt":"2022-08-20T21:39:27","slug":"%e4%bb%8e%e4%b8%80%e6%9d%a1%e6%9b%b4%e6%96%b0sql%e7%9a%84%e6%89%a7%e8%a1%8c%e8%bf%87%e7%a8%8b%e7%aa%a5%e6%8e%a2innodb%e4%b9%8bredolog","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006263","title":{"rendered":"\u4ece\u4e00\u6761\u66f4\u65b0SQL\u7684\u6267\u884c\u8fc7\u7a0b\u7aa5\u63a2InnoDB\u4e4bREDOLOG"},"content":{"rendered":"<p><strong>1 \u524d\u8a00<\/strong><\/p>\n<p>\u6570\u636e\u5e93\u4e3a\u4e86\u53d6\u5f97\u66f4\u597d\u7684\u8bfb\u5199\u6027\u80fd\uff0cInnoDB\u4f1a\u5c06\u6570\u636e\u7f13\u5b58\u5728\u5185\u5b58\u4e2d\uff08InnoDB Buffer Pool\uff09\uff0c\u5bf9\u78c1\u76d8\u6570\u636e\u7684\u4fee\u6539\u4e5f\u4f1a\u843d\u540e\u4e8e\u5185\u5b58\uff0c\u8fd9\u65f6\u5982\u679c\u8fdb\u7a0b\u6216\u673a\u5668\u5d29\u6e83\uff0c\u4f1a\u5bfc\u81f4\u5185\u5b58\u6570\u636e\u4e22\u5931\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u5e93\u672c\u8eab\u7684\u4e00\u81f4\u6027\u548c\u6301\u4e45\u6027\uff0cInnoDB\u7ef4\u62a4\u4e86REDO LOG\u3002\u4fee\u6539Page\u4e4b\u524d\u9700\u8981\u5148\u5c06\u4fee\u6539\u7684\u5185\u5bb9\u8bb0\u5f55\u5230REDO\u4e2d\uff0c\u5e76\u4fdd\u8bc1REDO LOG\u65e9\u4e8e\u5bf9\u5e94\u7684Page\u843d\u76d8\uff0c\u4e5f\u5c31\u662f\u5e38\u8bf4\u7684WAL\uff0cWrite Ahead Log\u3002\u5f53\u6545\u969c\u53d1\u751f\u5bfc\u81f4\u5185\u5b58\u6570\u636e\u4e22\u5931\u540e\uff0cInnoDB\u4f1a\u5728\u91cd\u542f\u65f6\uff0c\u901a\u8fc7\u91cd\u653eREDO\uff0c\u5c06Page\u6062\u590d\u5230\u5d29\u6e83\u524d\u7684\u72b6\u6001\u3002<\/p>\n<p><strong>2 MYSQL\u66f4\u65b0\u8bed\u53e5\u7684\u6267\u884c\u8fc7\u7a0b<\/strong><\/p>\n<p><strong>2.1 MYSQL\u7684\u4f53\u7cfb\u7ed3\u6784<\/strong><br \/>\u5927\u4f53\u6765\u8bf4\uff0cMySQL \u53ef\u4ee5\u5206\u4e3a \u5ba2\u6237\u7aef\u3001Server\u5c42\u548c\u5b58\u50a8\u5f15\u64ce\u5c42\u4e09\u5927\u90e8\u5206\uff0c\u5982\u56fe\u6240\u793a\u3002<br \/>Server \u5c42\u5305\u62ec\u8fde\u63a5\u5668\u3001\u67e5\u8be2\u7f13\u5b58\u3001\u5206\u6790\u5668\u3001\u4f18\u5316\u5668\u3001\u6267\u884c\u5668\u7b49\uff0c\u6db5\u76d6 MySQL \u7684\u5927\u591a\u6570\u6838\u5fc3\u670d\u52a1\u529f\u80fd\uff0c\u4ee5\u53ca\u6240\u6709\u7684\u5185\u7f6e\u51fd\u6570\uff08\u5982\u65e5\u671f\u3001\u65f6\u95f4\u3001\u6570\u5b66\u548c\u52a0\u5bc6\u51fd\u6570\u7b49\uff09\uff0c\u6240\u6709\u8de8\u5b58\u50a8\u5f15\u64ce\u7684\u529f\u80fd\u90fd\u5728\u8fd9\u4e00\u5c42\u5b9e\u73b0\uff0c\u6bd4\u5982\u5b58\u50a8\u8fc7\u7a0b\u3001\u89e6\u53d1\u5668\u3001\u89c6\u56fe\u7b49\u3002<\/p>\n<p>\u5b58\u50a8\u5f15\u64ce\u5c42\u8d1f\u8d23\u6570\u636e\u7684\u5b58\u50a8\u548c\u63d0\u53d6\u3002\u5176\u67b6\u6784\u6a21\u5f0f\u662f\u63d2\u4ef6\u5f0f\u7684\uff0c\u652f\u6301 InnoDB\u3001MyISAM\u3001Memory \u7b49\u591a\u4e2a\u5b58\u50a8\u5f15\u64ce\u3002\u73b0\u5728\u6700\u5e38\u7528\u7684\u5b58\u50a8\u5f15\u64ce\u662f InnoDB\uff0c\u5b83\u4ece MySQL 5.5.5 \u7248\u672c\u5f00\u59cb\u6210\u4e3a\u4e86\u9ed8\u8ba4\u5b58\u50a8\u5f15\u64ce\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042342144\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><strong>2.2 \u66f4\u65b0SQL\u7684\u6267\u884c<\/strong><\/p>\n<p>\u5f53\u6211\u4eec\u6267\u884c\u4e00\u6761\u66f4\u65b0SQL\u65f6\u662f\u5982\u4f55\u6267\u884c\u7684\u5462\uff0c\u4e0b\u9762\u6267\u884c\u4e00\u6761\u7b80\u5355\u7684SQL\u66f4\u65b0\u8bed\u53e5(\u9ed8\u8ba4\u5b58\u50a8\u5f15\u64ceInnoDB)<br \/>update T set c=c+1 where ID=2;<\/p>\n<p><strong>\u7b2c\u4e00\u6b65\uff1a\u8fde\u63a5\u5668<\/strong><br \/>\u5148\u901a\u8fc7\u8fde\u63a5\u5668\u8fde\u63a5\u5230\u8fd9\u4e2a\u6570\u636e\u5e93\u4e0a\u3002\u8fde\u63a5\u5668\u8d1f\u8d23\u8ddf\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\u3001\u6821\u9a8c\u7528\u6237\u540d\u5bc6\u7801\u7684\u6b63\u786e\u6027,\u540c\u65f6\u83b7\u53d6\u8be5\u7528\u6237\u7684\u6743\u9650\u653e\u5230\u7f13\u5b58\u4e2d\u3001\u7ef4\u6301\u548c\u7ba1\u7406\u8fde\u63a5<br \/><strong>\u7b2c\u4e8c\u6b65\uff1a\u7f13\u5b58<\/strong><br \/>\u8fde\u63a5\u5efa\u7acb\u5b8c\u6210\u540e\uff0c\u5982\u679c\u6267\u884c\u7684\u662fSELECT\u67e5\u8be2 \u8bed\u53e5\u4f1a\u67e5\u8be2\u7f13\u5b58\u4e2d\u662f\u5426\u5b58\u5728\u8be5SQL\u7684\u7ed3\u679c\u96c6\uff0c\u5982\u679c\u5b58\u5728\u7ed3\u679c\u5219\u518d\u6821\u9a8c\u7528\u6237\u8868\u548c\u6570\u636e\u7684\u6743\u9650\u6700\u7ec8\u5c06\u67e5\u8be2\u5230\u7684\u7ed3\u679c\u8fd4\u56de\u3002\u5982\u679c\u662fUPDATE\uff0cDELETE\u7b49\u66f4\u65b0\u64cd\u4f5c\uff0c\u90a3\u4e48\u8ddf\u8fd9\u4e2a\u8868\u6709\u5173\u7684\u67e5\u8be2\u7f13\u5b58\u4f1a\u7f6e\u4e3a\u5931\u6548\uff0c\u6240\u4ee5\u8fd9\u6761\u8bed\u53e5\u5c31\u4f1a\u628a\u8868 T \u4e0a\u6240\u6709\u7f13\u5b58\u7ed3\u679c\u90fd\u6e05\u7a7a\u3002<br \/><strong>\u7b2c\u4e09\u6b65\uff1a\u5206\u6790\u5668<\/strong><br \/>\u5982\u679c\u6ca1\u6709\u547d\u4e2d\u67e5\u8be2\u7f13\u5b58\uff0c\u5c31\u8981\u5f00\u59cb\u771f\u6b63\u6267\u884c\u8bed\u53e5\u4e86\u3002\u9996\u5148\uff0cMySQL \u9700\u8981\u77e5\u9053\u4f60\u8981\u505a\u4ec0\u4e48\uff0c\u56e0\u6b64\u9700\u8981\u5bf9 SQL \u8bed\u53e5\u505a\u89e3\u6790\u3002<br \/>\u5206\u6790\u5668\u5148\u4f1a\u505a\u201c\u8bcd\u6cd5\u5206\u6790\u201d\u3002\u4f60\u8f93\u5165\u7684\u662f\u7531\u591a\u4e2a\u5b57\u7b26\u4e32\u548c\u7a7a\u683c\u7ec4\u6210\u7684\u4e00\u6761 SQL \u8bed\u53e5\uff0cMySQL \u9700\u8981\u8bc6\u522b\u51fa\u91cc\u9762\u7684\u5b57\u7b26\u4e32\u5206\u522b\u662f\u4ec0\u4e48\uff0c\u4ee3\u8868\u4ec0\u4e48\u3002\u4f8b\u5982\u8be5\u8bed\u53e5\u4e2dc\u5217\u5728\u8868T\u4e2d\u662f\u5426\u5b58\u5728\u7b49\u3002<br \/>\u505a\u5b8c\u4e86\u8fd9\u4e9b\u8bc6\u522b\u4ee5\u540e\uff0c\u5c31\u8981\u505a\u201c\u8bed\u6cd5\u5206\u6790\u201d\u3002\u6839\u636e\u8bcd\u6cd5\u5206\u6790\u7684\u7ed3\u679c\uff0c\u8bed\u6cd5\u5206\u6790\u5668\u4f1a\u6839\u636e\u8bed\u6cd5\u89c4\u5219\uff0c\u5224\u65ad\u4f60\u8f93\u5165\u7684\u8fd9\u4e2a SQL \u8bed\u53e5\u662f\u5426\u6ee1\u8db3 MySQL \u8bed\u6cd5\u3002\u8be5SQL\u8bed\u53e5\u4e2d\u7684update\u3001where \u7b49\u662f\u5426\u7b26\u5408SQL\u8bed\u6cd5<br \/><strong>\u7b2c\u56db\u6b65\uff1a\u4f18\u5316\u5668<\/strong><br \/>\u7ecf\u8fc7\u4e86\u5206\u6790\u5668\uff0cMySQL \u5c31\u77e5\u9053\u4f60\u8981\u505a\u4ec0\u4e48\u4e86\u3002\u5728\u5f00\u59cb\u6267\u884c\u4e4b\u524d\uff0c\u8fd8\u8981\u5148\u7ecf\u8fc7\u4f18\u5316\u5668\u7684\u5904\u7406\u3002\u4f18\u5316\u5668\u662f\u5728\u8868\u91cc\u9762\u6709\u591a\u4e2a\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u51b3\u5b9a\u4f7f\u7528\u54ea\u4e2a\u7d22\u5f15\uff1b\u6216\u8005\u5728\u4e00\u4e2a\u8bed\u53e5\u6709\u591a\u8868\u5173\u8054\uff08join\uff09\u7684\u65f6\u5019\uff0c\u51b3\u5b9a\u5404\u4e2a\u8868\u7684\u8fde\u63a5\u987a\u5e8f\uff1b\u4f18\u5316\u5668\u51b3\u5b9a\u8981\u4f7f\u7528 ID \u8fd9\u4e2a\u7d22\u5f15\u3002\u6307\u5b9a\u7d22\u5f15\u4e5f\u5c31\u6307\u5b9a\u4e86\u540e\u9762\u7684\u6267\u884c\u5668\u9700\u8981\u8c03\u7528\u5b58\u50a8\u5f15\u64ce\u7684\u54ea\u4e2a\u63a5\u53e3\u8fdb\u884c\u6267\u884c\u3002<br \/><strong>\u7b2c\u4e94\u6b65\uff1a\u6267\u884c\u5668<\/strong><br \/>MySQL \u901a\u8fc7\u5206\u6790\u5668\u77e5\u9053\u4e86\u4f60\u8981\u505a\u4ec0\u4e48\uff0c\u901a\u8fc7\u4f18\u5316\u5668\u77e5\u9053\u4e86\u8be5\u600e\u4e48\u505a\uff0c\u4e8e\u662f\u5c31\u8fdb\u5165\u4e86\u6267\u884c\u5668\u9636\u6bb5\uff0c\u5f00\u59cb\u6267\u884c\u8bed\u53e5\u3002\u5f00\u59cb\u6267\u884c\u7684\u65f6\u5019\uff0c\u8981\u5148\u5224\u65ad\u4e00\u4e0b\u4f60\u5bf9\u8fd9\u4e2a\u8868 T \u6709\u6ca1\u6709\u6267\u884c\u67e5\u8be2\u7684\u6743\u9650\uff0c\u5982\u679c\u6ca1\u6709\uff0c\u5c31\u4f1a\u8fd4\u56de\u6ca1\u6709\u6743\u9650\u7684\u9519\u8bef\u3002\u6267\u884c\u5668\u8d1f\u8d23\u5177\u4f53\u6267\u884c\uff0c\u627e\u5230\u8fd9\u4e00\u884c\uff0c\u7136\u540e\u66f4\u65b0\u3002<br \/><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042342145\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><strong>2.3 InnoDB\u5b58\u50a8\u5f15\u64ce\u5f15\u5165REDOLOG<\/strong><\/p>\n<p>Mysql\u672c\u8eab\u6709\u81ea\u5df1\u7684\u65e5\u5fd7\u8bb0\u5f55binlog(\u5f52\u6863\u65e5\u5fd7:\u5206\u4e3arow\uff0cstatement\u4e24\u79cd\u6a21\u5f0f)\uff0c\u4f46\u662f\u53ea\u4f9d\u9760binlog\u662f\u6ca1\u6709crash-safe\u80fd\u529b\u7684\uff0c\u6240\u4ee5\u5728\u5b58\u50a8\u5f15\u64ce\u5c42InnoDB\u4f7f\u7528\u53e6\u5916\u4e00\u5957\u65e5\u5fd7\u7cfb\u7edfredolog\u6765\u5b9e\u73b0crash-safe\u80fd\u529b\u3002\u540c\u65f6\u4e3a\u4e86\u53d6\u5f97\u66f4\u597d\u7684\u8bfb\u5199\u6027\u80fd\uff0cInnoDB\u4f1a\u5c06\u6570\u636e\u7f13\u5b58\u5728\u5185\u5b58\u4e2d\uff08InnoDB Buffer Pool\uff09\uff0c\u5bf9\u78c1\u76d8\u6570\u636e\u7684\u4fee\u6539\u4e5f\u4f1a\u843d\u540e\u4e8e\u5185\u5b58\uff0c\u8fd9\u65f6\u5982\u679c\u8fdb\u7a0b\u6216\u673a\u5668\u5d29\u6e83\uff0c\u4f1a\u5bfc\u81f4\u5185\u5b58\u6570\u636e\u4e22\u5931\uff0c\u4ece\u800c\u4fdd\u8bc1\u6570\u636e\u5e93\u672c\u8eab\u7684\u4e00\u81f4\u6027\u548c\u6301\u4e45\u6027\u3002\u4fee\u6539Page\u4e4b\u524d\u9700\u8981\u5148\u5c06\u4fee\u6539\u7684\u5185\u5bb9\u8bb0\u5f55\u5230REDO\u4e2d\uff0c\u5e76\u4fdd\u8bc1REDO LOG\u65e9\u4e8e\u5bf9\u5e94\u7684Page\u843d\u76d8\uff0c\u4e5f\u5c31\u662f\u5e38\u8bf4\u7684WAL\uff0cWrite Ahead Log\u3002\u5f53\u6545\u969c\u53d1\u751f\u5bfc\u81f4\u5185\u5b58\u6570\u636e\u4e22\u5931\u540e\uff0cInnoDB\u4f1a\u5728\u91cd\u542f\u65f6\uff0c\u901a\u8fc7\u91cd\u653eREDO\uff0c\u5c06Page\u6062\u590d\u5230\u5d29\u6e83\u524d\u7684\u72b6\u6001\u3002<\/p>\n<p>\u90a3\u4e48\u6211\u4eec\u9700\u8981\u4ec0\u4e48\u6837\u7684REDO\u5462\uff1f<\/p>\n<p>\u9996\u5148\uff0cREDO\u7684\u7ef4\u62a4\u589e\u52a0\u4e86\u4e00\u4efd\u5199\u76d8\u6570\u636e\uff0c\u540c\u65f6\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u6b63\u786e\uff0c\u4e8b\u52a1\u53ea\u6709\u5728\u4ed6\u7684REDO\u5168\u90e8\u843d\u76d8\u624d\u80fd\u8fd4\u56de\u7528\u6237\u6210\u529f\uff0cREDO\u7684\u5199\u76d8\u65f6\u95f4\u4f1a\u76f4\u63a5\u5f71\u54cd\u7cfb\u7edf\u541e\u5410\uff0c\u663e\u800c\u6613\u89c1\uff0cREDO\u7684\u6570\u636e\u91cf\u8981\u5c3d\u91cf\u5c11\u3002\u5176\u6b21\uff0c\u7cfb\u7edf\u5d29\u6e83\u603b\u662f\u53d1\u751f\u5728\u59cb\u6599\u672a\u53ca\u7684\u65f6\u5019\uff0c\u5f53\u91cd\u542f\u91cd\u653eREDO\u65f6\uff0c\u7cfb\u7edf\u5e76\u4e0d\u77e5\u9053\u54ea\u4e9bREDO\u5bf9\u5e94\u7684Page\u5df2\u7ecf\u843d\u76d8\uff0c\u56e0\u6b64REDO\u7684\u91cd\u653e\u5fc5\u987b\u53ef\u91cd\u5165\uff0c\u5373REDO\u64cd\u4f5c\u8981\u4fdd\u8bc1\u5e42\u7b49\u3002\u6700\u540e\uff0c\u4e3a\u4e86\u4fbf\u4e8e\u901a\u8fc7\u5e76\u53d1\u91cd\u653e\u7684\u65b9\u5f0f\u52a0\u5feb\u91cd\u542f\u6062\u590d\u901f\u5ea6\uff0cREDO\u5e94\u8be5\u662f\u57fa\u4e8ePage\u7684\uff0c\u5373\u4e00\u4e2aREDO\u53ea\u6d89\u53ca\u4e00\u4e2aPage\u7684\u4fee\u6539\u3002<\/p>\n<p>\u6570\u636e\u91cf\u5c0f\u662fLogical Logging\u7684\u4f18\u70b9\uff0c\u800c\u5e42\u7b49\u4ee5\u53ca\u57fa\u4e8ePage\u6b63\u662fPhysical Logging\u7684\u4f18\u70b9\u3002InnoDB\u91c7\u53d6\u4e86\u4e00\u79cd\u79f0\u4e3aPhysiological Logging\u7684\u65b9\u5f0f\uff0c\u6765\u517c\u5f97\u4e8c\u8005\u7684\u4f18\u52bf\u3002\u6240\u8c13Physiological Logging\uff0c\u5c31\u662f\u4ee5Page\u4e3a\u5355\u4f4d\uff0c\u4f46\u5728Page\u5185\u4ee5\u903b\u8f91\u7684\u65b9\u5f0f\u8bb0\u5f55\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u4e00\u79cd\u4f5c\u7528\u4e8ePage\u7c7b\u578b\u7684REDOLOG\u4e2d\u8bb0\u5f55\u4e86\u5bf9Page\u4e2d\u4e00\u4e2aRecord\u7684\u4fee\u6539\uff0c\u65b9\u6cd5\u5982\u4e0b\uff1a<br \/>\uff08Page ID\uff0cRecord Offset\uff0c(Filed 1, Value 1) \u2026 (Filed i, Value i) \u2026 )<br \/>\u5176\u4e2d\uff0cPageID\u6307\u5b9a\u8981\u64cd\u4f5c\u7684Page\u9875\uff0cRecord 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Number\u552f\u4e00\u6807\u8bc6\u4e00\u4e2aPage\u9875\uff0c\u8fd9\u4e09\u9879\u662f\u6240\u6709REDO\u8bb0\u5f55\u90fd\u9700\u8981\u6709\u7684\u5934\u4fe1\u606f\u3002<\/p>\n<p>\u540e\u9762\u7684\u662fMLOG_REC_UPDATE_IN_PLACE\u7c7b\u578b(\u4f5c\u7528\u4e8ePage)\u72ec\u6709\u7684\uff0c\u5176\u4e2dRecord Offset\u7528\u7ed9\u51fa\u8981\u4fee\u6539\u7684\u8bb0\u5f55\u5728Page\u4e2d\u7684\u4f4d\u7f6e\u504f\u79fb\uff0cUpdate Field Count\u8bf4\u660e\u8bb0\u5f55\u91cc\u6709\u51e0\u4e2aField\u8981\u4fee\u6539\uff0c\u7d27\u63a5\u7740\u5bf9\u6bcf\u4e2aField\u7ed9\u51fa\u4e86Field\u7f16\u53f7(Field Number)\uff0c\u6570\u636e\u957f\u5ea6\uff08Field Data Length\uff09\u4ee5\u53ca\u6570\u636e\uff08Filed Data\uff09<\/p>\n<p><strong>3 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[&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-10006263","post","type-post","status-publish","format-standard","hentry"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006263","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10006263"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006263\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10006263"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10006263"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10006263"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}