\u54c8\u55bd\uff01\u4eca\u5929\u5fc3\u8840\u6765\u6f6e\u7ed9\u5927\u5bb6\u5e26\u6765\u4e86\u300aRedis\u6301\u4e45\u5316\u539f\u7406\u5b9e\u4f8b\u5206\u6790\u300b<\/span>\uff0c\u60f3\u5fc5\u5927\u5bb6\u5e94\u8be5\u5bf9\u6570\u636e\u5e93<\/span>\u90fd\u4e0d\u964c\u751f\u5427\uff0c\u90a3\u4e48\u9605\u8bfb\u672c\u6587\u5c31\u90fd\u4e0d\u4f1a\u5f88\u56f0\u96be\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<\/span>\uff0c\u82e5\u662f\u4f60\u6b63\u5728\u5b66\u4e60\u6570\u636e\u5e93<\/span>\uff0c\u5343\u4e07\u522b\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u4f60\uff01<\/p>\n Redis\u662f\u4e00\u4e2a\u5185\u5b58\u6570\u636e\u5e93\uff0c\u6240\u6709\u7684\u6570\u636e\u5c06\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d\uff0c\u8fd9\u4e0e\u4f20\u7edf\u7684MySQL\u3001Oracle\u3001SqlServer\u7b49\u5173\u7cfb\u578b\u6570\u636e\u5e93\u76f4\u63a5\u628a\u6570\u636e\u4fdd\u5b58\u5230\u786c\u76d8\u76f8\u6bd4\uff0cRedis\u7684\u8bfb\u5199\u6548\u7387\u975e\u5e38\u9ad8\u3002\u4f46\u662f\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d\u4e5f\u6709\u4e00\u4e2a\u5f88\u5927\u7684\u7f3a\u9677\uff0c\u4e00\u65e6\u65ad\u7535\u6216\u8005\u5b95\u673a\uff0c\u5185\u5b58\u6570\u636e\u5e93\u4e2d\u7684\u5185\u5bb9\u5c06\u4f1a\u5168\u90e8\u4e22\u5931\u3002\u4e3a\u4e86\u5f25\u8865\u8fd9\u4e00\u7f3a\u9677\uff0cRedis\u63d0\u4f9b\u4e86\u628a\u5185\u5b58\u6570\u636e\u6301\u4e45\u5316\u5230\u786c\u76d8\u6587\u4ef6\uff0c\u4ee5\u53ca\u901a\u8fc7\u5907\u4efd\u6587\u4ef6\u6765\u6062\u590d\u6570\u636e\u7684\u529f\u80fd\uff0c\u5373Redis\u6301\u4e45\u5316\u673a\u5236\u3002<\/p>\n Redis\u652f\u6301\u4e24\u79cd\u65b9\u5f0f\u7684\u6301\u4e45\u5316\uff1aRDB\u5feb\u7167\u548cAOF\u3002<\/p>\n RDB\u5feb\u7167\u7528\u5b98\u65b9\u7684\u8bdd\u6765\u8bf4\uff1aRDB\u6301\u4e45\u5316\u65b9\u6848\u662f\u6309\u7167\u6307\u5b9a\u65f6\u95f4\u95f4\u9694\u5bf9\u4f60\u7684\u6570\u636e\u96c6\u751f\u6210\u7684\u65f6\u95f4\u70b9\u5feb\u7167\uff08point-to-time snapshot\uff09\u3002\u5b83\u4ee5\u7d27\u7f29\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\u4fdd\u5b58Redis\u6570\u636e\u5e93\u67d0\u4e00\u65f6\u523b\u6240\u6709\u6570\u636e\u5bf9\u8c61\u7684\u5185\u5b58\u5feb\u7167\uff0c\u53ef\u7528\u4e8eRedis\u7684\u6570\u636e\u5907\u4efd\u3001\u8f6c\u79fb\u4e0e\u6062\u590d\u3002\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u4ecd\u662f\u5b98\u65b9\u7684\u9ed8\u8ba4\u652f\u6301\u65b9\u6848\u3002<\/p>\n \u65e2\u7136\u8bf4RDB\u662fRedis\u4e2d\u6570\u636e\u96c6\u7684\u65f6\u95f4\u70b9\u5feb\u7167\uff0c\u90a3\u6211\u4eec\u5148\u7b80\u5355\u4e86\u89e3\u4e00\u4e0bRedis\u5185\u7684\u6570\u636e\u5bf9\u8c61\u5728\u5185\u5b58\u4e2d\u662f\u5982\u4f55\u5b58\u50a8\u4e0e\u7ec4\u7ec7\u7684\u3002<\/p>\n \u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cRedis\u4e2d\u670916\u4e2a\u6570\u636e\u5e93\uff0c\u7f16\u53f7\u4ece0-15\uff0c\u6bcf\u4e2aRedis\u6570\u636e\u5e93\u4f7f\u7528\u4e00\u4e2a \u5f53\u7136\uff0c\u8fd9\u4e2a\u524d\u63d0\u65f6\u6211\u4eec\u4e0a\u9762\u7684\u5047\u8bbe\u6210\u7acb\uff0c\u5426\u5219\u9762\u5bf9\u4e00\u4e2a\u65f6\u523b\u53d8\u5316\u7684\u6570\u636e\u96c6\uff0c\u6211\u4eec\u65e0\u4ece\u4e0b\u624b\u3002\u6211\u4eec\u77e5\u9053Redis\u4e2d\u5ba2\u6237\u7aef\u547d\u4ee4\u5904\u7406\u662f\u5355\u7ebf\u7a0b\u6a21\u578b\uff0c\u5982\u679c\u628a\u6301\u4e45\u5316\u4f5c\u4e3a\u4e00\u4e2a\u547d\u4ee4\u5904\u7406\uff0c\u90a3\u6570\u636e\u96c6\u80af\u5b9a\u65f6\u5904\u4e8e\u9759\u6b62\u72b6\u6001\u3002\u53e6\u5916\uff0c\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u7684fork()\u51fd\u6570\u521b\u5efa\u7684\u5b50\u8fdb\u7a0b\u53ef\u83b7\u5f97\u4e0e\u7236\u8fdb\u7a0b\u4e00\u81f4\u7684\u5185\u5b58\u6570\u636e\uff0c\u76f8\u5f53\u4e8e\u83b7\u53d6\u4e86\u5185\u5b58\u6570\u636e\u526f\u672c\uff1bfork\u5b8c\u6210\u540e\uff0c\u7236\u8fdb\u7a0b\u8be5\u5e72\u561b\u5e72\u561b\uff0c\u6301\u4e45\u5316\u72b6\u6001\u7684\u5de5\u4f5c\u4ea4\u7ed9\u5b50\u8fdb\u7a0b\u5c31\u884c\u4e86\u3002<\/p>\n \u5f88\u663e\u7136\uff0c\u7b2c\u4e00\u79cd\u60c5\u51b5\u4e0d\u53ef\u53d6\uff0c\u6301\u4e45\u5316\u5907\u4efd\u4f1a\u5bfc\u81f4\u77ed\u65f6\u95f4\u5185Redis\u670d\u52a1\u4e0d\u53ef\u7528\uff0c\u8fd9\u5bf9\u4e8e\u9ad8HA\u7684\u7cfb\u7edf\u6765\u8bb2\u662f\u65e0\u6cd5\u5bb9\u5fcd\u7684\u3002\u6240\u4ee5\uff0c\u7b2c\u4e8c\u79cd\u65b9\u5f0f\u662fRDB\u6301\u4e45\u5316\u7684\u4e3b\u8981\u5b9e\u8df5\u65b9\u5f0f\u3002\u7531\u4e8efork\u5b50\u8fdb\u7a0b\u540e\uff0c\u7236\u8fdb\u7a0b\u6570\u636e\u4e00\u76f4\u5728\u53d8\u5316\uff0c\u5b50\u8fdb\u7a0b\u5e76\u4e0d\u4e0e\u7236\u8fdb\u7a0b\u540c\u6b65\uff0cRDB\u6301\u4e45\u5316\u5fc5\u7136\u65e0\u6cd5\u4fdd\u8bc1\u5b9e\u65f6\u6027\uff1bRDB\u6301\u4e45\u5316\u5b8c\u6210\u540e\u53d1\u751f\u65ad\u7535\u6216\u5b95\u673a\uff0c\u4f1a\u5bfc\u81f4\u90e8\u5206\u6570\u636e\u4e22\u5931\uff1b\u5907\u4efd\u9891\u7387\u51b3\u5b9a\u4e86\u4e22\u5931\u6570\u636e\u91cf\u7684\u5927\u5c0f\uff0c\u63d0\u9ad8\u5907\u4efd\u9891\u7387\uff0c\u610f\u5473\u7740fork\u8fc7\u7a0b\u6d88\u8017\u8f83\u591a\u7684CPU\u8d44\u6e90\uff0c\u4e5f\u4f1a\u5bfc\u81f4\u8f83\u5927\u7684\u78c1\u76d8I\/O\u3002<\/p>\n \u5728Redis\u5185\u5b8c\u6210RDB\u6301\u4e45\u5316\u7684\u65b9\u6cd5\u6709rdbSave\u548crdbSaveBackground\u4e24\u4e2a\u51fd\u6570\u65b9\u6cd5\uff08\u6e90\u7801\u6587\u4ef6rdb.c\u4e2d\uff09\uff0c\u5148\u7b80\u5355\u8bf4\u4e0b\u4e24\u8005\u5dee\u522b\uff1a<\/p>\n rdbSave\uff1a\u662f\u540c\u6b65\u6267\u884c\u7684\uff0c\u65b9\u6cd5\u8c03\u7528\u540e\u5c31\u4f1a\u7acb\u523b\u542f\u52a8\u6301\u4e45\u5316\u6d41\u7a0b\u3002\u7531\u4e8eRedis\u662f\u5355\u7ebf\u7a0b\u6a21\u578b\uff0c\u6301\u4e45\u5316\u8fc7\u7a0b\u4e2d\u4f1a\u963b\u585e\uff0cRedis\u65e0\u6cd5\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\uff1b<\/p>\n<\/li>\n rdbSaveBackground\uff1a\u662f\u540e\u53f0\uff08\u5f02\u6b65\uff09\u6267\u884c\u7684\uff0c\u8be5\u65b9\u6cd5\u4f1afork\u51fa\u5b50\u8fdb\u7a0b\uff0c\u771f\u6b63\u7684\u6301\u4e45\u5316\u8fc7\u7a0b\u662f\u5728\u5b50\u8fdb\u7a0b\u4e2d\u6267\u884c\u7684\uff08\u8c03\u7528rdbSave\uff09\uff0c\u4e3b\u8fdb\u7a0b\u4f1a\u7ee7\u7eed\u63d0\u4f9b\u670d\u52a1\uff1b<\/p>\n<\/li>\n<\/ul>\n RDB\u6301\u4e45\u5316\u7684\u89e6\u53d1\u5fc5\u7136\u79bb\u4e0d\u5f00\u4ee5\u4e0a\u4e24\u4e2a\u65b9\u6cd5\uff0c\u89e6\u53d1\u7684\u65b9\u5f0f\u5206\u4e3a\u624b\u52a8\u548c\u81ea\u52a8\u3002\u624b\u52a8\u89e6\u53d1\u5bb9\u6613\u7406\u89e3\uff0c\u662f\u6307\u6211\u4eec\u901a\u8fc7Redis\u5ba2\u6237\u7aef\u4eba\u4e3a\u7684\u5bf9Redis\u670d\u52a1\u7aef\u53d1\u8d77\u6301\u4e45\u5316\u5907\u4efd\u6307\u4ee4\uff0c\u7136\u540eRedis\u670d\u52a1\u7aef\u5f00\u59cb\u6267\u884c\u6301\u4e45\u5316\u6d41\u7a0b\uff0c\u8fd9\u91cc\u7684\u6307\u4ee4\u6709save\u548cbgsave\u3002\u81ea\u52a8\u89e6\u53d1\u662fRedis\u6839\u636e\u81ea\u8eab\u8fd0\u884c\u8981\u6c42\uff0c\u5728\u6ee1\u8db3\u9884\u8bbe\u6761\u4ef6\u65f6\u81ea\u52a8\u89e6\u53d1\u7684\u6301\u4e45\u5316\u6d41\u7a0b\uff0c\u81ea\u52a8\u89e6\u53d1\u7684\u573a\u666f\u6709\u5982\u4e0b\u51e0\u4e2a\uff08\u6458\u81ea\u8fd9\u7bc7\u6587\u7ae0\uff09\uff1a<\/p>\n serverCron\u4e2d \u4ece\u8282\u70b9\u5168\u91cf\u590d\u5236\u65f6\uff0c\u4e3b\u8282\u70b9\u53d1\u9001rdb\u6587\u4ef6\u7ed9\u4ece\u8282\u70b9\u5b8c\u6210\u590d\u5236\u64cd\u4f5c\uff0c\u4e3b\u8282\u70b9\u4f1a\u51fa\u53d1bgsave\uff1b<\/p>\n<\/li>\n \u6267\u884c \u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff08\u672a\u5f00\u542fAOF\uff09\u6267\u884cshutdown\u547d\u4ee4\u65f6\uff0c\u81ea\u52a8\u6267\u884cbgsave\uff1b<\/p>\n<\/li>\n<\/ul>\n \u7ed3\u5408\u6e90\u7801\u53ca\u53c2\u8003\u6587\u7ae0\uff0c\u6211\u6574\u7406\u4e86RDB\u6301\u4e45\u5316\u6d41\u7a0b\u6765\u5e2e\u52a9\u5927\u5bb6\u6709\u4e2a\u6574\u4f53\u7684\u4e86\u89e3\uff0c\u7136\u540e\u518d\u4ece\u4e00\u4e9b\u7ec6\u8282\u8fdb\u884c\u8bf4\u660e\u3002 \u81ea\u52a8\u89e6\u53d1\u7684RDB\u6301\u4e45\u5316\u662f\u901a\u8fc7rdbSaveBackground\u4ee5\u5b50\u8fdb\u7a0b\u65b9\u5f0f\u6267\u884c\u7684\u6301\u4e45\u5316\u7b56\u7565\uff1b<\/p>\n<\/li>\n \u624b\u52a8\u89e6\u53d1\u662f\u4ee5\u5ba2\u6237\u7aef\u547d\u4ee4\u65b9\u5f0f\u89e6\u53d1\u7684\uff0c\u5305\u542bsave\u548cbgsave\u4e24\u4e2a\u547d\u4ee4\uff0c\u5176\u4e2dsave\u547d\u4ee4\u662f\u5728Redis\u7684\u547d\u4ee4\u5904\u7406\u7ebf\u7a0b\u4ee5\u963b\u585e\u7684\u65b9\u5f0f\u8c03\u7528 \u81ea\u52a8\u89e6\u53d1\u6d41\u7a0b\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u94fe\u8def\uff0c\u6db5\u76d6\u4e86rdbSaveBackground\u3001rdbSave\u7b49\uff0c\u63a5\u4e0b\u6765\u6211\u4ee5serverCron\u4e3a\u4f8b\u5206\u6790\u4e00\u4e0b\u6574\u4e2a\u6d41\u7a0b\u3002<\/p>\n save\u89c4\u5219\u53ca\u68c0\u67e5<\/p>\n serverCron\u662fRedis\u5185\u7684\u4e00\u4e2a\u5468\u671f\u6027\u51fd\u6570\uff0c\u6bcf\u9694100\u6beb\u79d2\u6267\u884c\u4e00\u6b21\uff0c\u5b83\u7684\u5176\u4e2d\u4e00\u9879\u5de5\u4f5c\u5c31\u662f\uff1a\u6839\u636e\u914d\u7f6e\u6587\u4ef6\u4e2dsave\u89c4\u5219\u6765\u5224\u65ad\u5f53\u524d\u9700\u8981\u8fdb\u884c\u81ea\u52a8\u6301\u4e45\u5316\u6d41\u7a0b\uff0c\u5982\u679c\u6ee1\u8db3\u6761\u4ef6\u5219\u5c1d\u8bd5\u5f00\u59cb\u6301\u4e45\u5316\u3002\u4e86\u89e3\u4e00\u4e0b\u8fd9\u90e8\u5206\u7684\u5b9e\u73b0\u3002<\/p>\n \u5728 \u5982\u679c\u6ca1\u6709\u540e\u53f0\u7684RDB\u6301\u4e45\u5316\u6216AOF\u91cd\u5199\u8fdb\u7a0b\uff0cserverCron\u4f1a\u6839\u636e\u4ee5\u4e0a\u914d\u7f6e\u53ca\u72b6\u6001\u5224\u65ad\u662f\u5426\u9700\u8981\u6267\u884c\u6301\u4e45\u5316\u64cd\u4f5c\uff0c\u5224\u65ad\u4f9d\u636e\u5c31\u662f\u770blastsave\u3001dirty\u662f\u5426\u6ee1\u8db3saveparams\u6570\u7ec4\u4e2d\u7684\u5176\u4e2d\u4e00\u4e2a\u6761\u4ef6\u3002\u5982\u679c\u6709\u4e00\u4e2a\u6761\u4ef6\u5339\u914d\uff0c\u5219\u8c03\u7528rdbSaveBackground\u65b9\u6cd5\uff0c\u6267\u884c\u5f02\u6b65\u6301\u4e45\u5316\u6d41\u7a0b\u3002<\/p>\n rdbSaveBackground<\/p>\n rdbSaveBackground\u662fRDB\u6301\u4e45\u5316\u7684\u8f85\u52a9\u6027\u65b9\u6cd5\uff0c\u4e3b\u8981\u5de5\u4f5c\u662ffork\u5b50\u8fdb\u7a0b\uff0c\u7136\u540e\u6839\u636e\u8c03\u7528\u65b9\uff08\u7236\u8fdb\u7a0b\u6216\u8005\u5b50\u8fdb\u7a0b\uff09\u4e0d\u540c\uff0c\u6709\u4e24\u79cd\u4e0d\u540c\u7684\u6267\u884c\u903b\u8f91\u3002<\/p>\n \u5982\u679c\u8c03\u7528\u65b9\u662f\u7236\u8fdb\u7a0b\uff0c\u5219fork\u51fa\u5b50\u8fdb\u7a0b\uff0c\u4fdd\u5b58\u5b50\u8fdb\u7a0b\u4fe1\u606f\u540e\u76f4\u63a5\u8fd4\u56de\u3002<\/p>\n<\/li>\n \u5982\u679c\u8c03\u7528\u65b9\u662f\u5b50\u8fdb\u7a0b\u5219\u8c03\u7528rdbSave\u6267\u884cRDB\u6301\u4e45\u5316\u903b\u8f91\uff0c\u6301\u4e45\u5316\u5b8c\u6210\u540e\u9000\u51fa\u5b50\u8fdb\u7a0b\u3002<\/p>\n<\/li>\n<\/ul>\n rdbSave\u662f\u771f\u6b63\u6267\u884c\u6301\u4e45\u5316\u7684\u65b9\u6cd5\uff0c\u5b83\u5728\u6267\u884c\u65f6\u5b58\u5728\u5927\u91cf\u7684I\/O\u3001\u8ba1\u7b97\u64cd\u4f5c\uff0c\u8017\u65f6\u3001CPU\u5360\u7528\u8f83\u5927\uff0c\u5728Redis\u7684\u5355\u7ebf\u7a0b\u6a21\u578b\u4e2d\u6301\u4e45\u5316\u8fc7\u7a0b\u4f1a\u6301\u7eed\u5360\u7528\u7ebf\u7a0b\u8d44\u6e90\uff0c\u8fdb\u800c\u5bfc\u81f4Redis\u65e0\u6cd5\u63d0\u4f9b\u5176\u4ed6\u670d\u52a1\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898Redis\u5728rdbSaveBackground\u4e2dfork\u51fa\u5b50\u8fdb\u7a0b\uff0c\u7531\u5b50\u8fdb\u7a0b\u5b8c\u6210\u6301\u4e45\u5316\u5de5\u4f5c\uff0c\u907f\u514d\u4e86\u5360\u7528\u7236\u8fdb\u7a0b\u8fc7\u591a\u7684\u8d44\u6e90\u3002<\/p>\n \u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u7236\u8fdb\u7a0b\u5185\u5b58\u5360\u7528\u8fc7\u5927\uff0cfork\u8fc7\u7a0b\u4f1a\u6bd4\u8f83\u8017\u65f6\uff0c\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u7236\u8fdb\u7a0b\u65e0\u6cd5\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\uff1b\u53e6\u5916\uff0c\u9700\u8981\u7efc\u5408\u8003\u8651\u8ba1\u7b97\u673a\u5185\u5b58\u4f7f\u7528\u91cf\uff0cfork\u5b50\u8fdb\u7a0b\u540e\u4f1a\u5360\u7528\u53cc\u500d\u7684\u5185\u5b58\u8d44\u6e90\uff0c\u9700\u8981\u786e\u4fdd\u5185\u5b58\u591f\u7528\u3002\u901a\u8fc7info stats\u547d\u4ee4\u67e5\u770blatest_fork_usec\u9009\u9879\uff0c\u53ef\u4ee5\u83b7\u53d6\u6700\u8fd1\u4e00\u4e2afork\u4ee5\u64cd\u4f5c\u7684\u8017\u65f6\u3002<\/p>\n rdbSave<\/p>\n Redis\u7684rdbSave\u51fd\u6570\u662f\u771f\u6b63\u8fdb\u884cRDB\u6301\u4e45\u5316\u7684\u51fd\u6570\uff0c\u6d41\u7a0b\u3001\u7ec6\u8282\u8d3c\u591a\uff0c\u6574\u4f53\u6d41\u7a0b\u53ef\u4ee5\u603b\u7ed3\u4e3a\uff1a\u521b\u5efa\u5e76\u6253\u5f00\u4e34\u65f6\u6587\u4ef6\u3001Redis\u5185\u5b58\u6570\u636e\u5199\u5165\u4e34\u65f6\u6587\u4ef6\u3001\u4e34\u65f6\u6587\u4ef6\u5199\u5165\u78c1\u76d8\u3001\u4e34\u65f6\u6587\u4ef6\u91cd\u547d\u540d\u4e3a\u6b63\u5f0fRDB\u6587\u4ef6\u3001\u66f4\u65b0\u6301\u4e45\u5316\u72b6\u6001\u4fe1\u606f\uff08dirty\u3001lastsave\uff09\u3002\u5176\u4e2d\u201cRedis\u5185\u5b58\u6570\u636e\u5199\u5165\u4e34\u65f6\u6587\u4ef6\u201d\u6700\u4e3a\u6838\u5fc3\u548c\u590d\u6742\uff0c\u5199\u5165\u8fc7\u7a0b\u76f4\u63a5\u4f53\u73b0\u4e86RDB\u6587\u4ef6\u7684\u6587\u4ef6\u683c\u5f0f\uff0c\u672c\u7740\u4e00\u56fe\u80dc\u5343\u8a00\u7684\u7406\u5ff5\uff0c\u6211\u6309\u7167\u6e90\u7801\u6d41\u7a0b\u7ed8\u5236\u4e86\u4e0b\u56fe\u3002 \u4e0a\u4e00\u8282\u6211\u4eec\u77e5\u9053RDB\u662f\u4e00\u79cd\u65f6\u95f4\u70b9\uff08point-to-time\uff09\u5feb\u7167\uff0c\u9002\u5408\u6570\u636e\u5907\u4efd\u53ca\u707e\u96be\u6062\u590d\uff0c\u7531\u4e8e\u5de5\u4f5c\u539f\u7406\u7684\u201c\u5148\u5929\u6027\u7f3a\u9677\u201d\u65e0\u6cd5\u4fdd\u8bc1\u5b9e\u65f6\u6027\u6301\u4e45\u5316\uff0c\u8fd9\u5bf9\u4e8e\u7f13\u5b58\u4e22\u5931\u96f6\u5bb9\u5fcd\u7684\u7cfb\u7edf\u6765\u8bf4\u662f\u4e2a\u786c\u4f24\uff0c\u4e8e\u662f\u5c31\u6709\u4e86AOF\u3002<\/p>\n AOF\u662fAppend Only File\u7684\u7f29\u5199\uff0c\u5b83\u662fRedis\u7684\u5b8c\u5168\u6301\u4e45\u5316\u7b56\u7565\uff0c\u4ece1.1\u7248\u672c\u5f00\u59cb\u652f\u6301\uff1b\u8fd9\u91cc\u7684file\u5b58\u50a8\u7684\u662f\u5f15\u8d77Redis\u6570\u636e\u4fee\u6539\u7684\u547d\u4ee4\u96c6\u5408\uff08\u6bd4\u5982\uff1aset\/hset\/del\u7b49\uff09\uff0c\u8fd9\u4e9b\u96c6\u5408\u6309\u7167Redis Server\u7684\u5904\u7406\u987a\u5e8f\u8ffd\u52a0\u5230\u6587\u4ef6\u4e2d\u3002\u5f53\u91cd\u542fRedis\u65f6\uff0cRedis\u5c31\u53ef\u4ee5\u4ece\u5934\u8bfb\u53d6AOF\u4e2d\u7684\u6307\u4ee4\u5e76\u91cd\u653e\uff0c\u8fdb\u800c\u6062\u590d\u5173\u95ed\u524d\u7684\u6570\u636e\u72b6\u6001\u3002<\/p>\n AOF\u6301\u4e45\u5316\u9ed8\u8ba4\u662f\u5173\u95ed\u7684\uff0c\u4fee\u6539redis.conf\u4ee5\u4e0b\u4fe1\u606f\u5e76\u91cd\u542f\uff0c\u5373\u53ef\u5f00\u542fAOF\u6301\u4e45\u5316\u529f\u80fd\u3002<\/p>\n AOF\u672c\u8d28\u662f\u4e3a\u4e86\u6301\u4e45\u5316\uff0c\u6301\u4e45\u5316\u5bf9\u8c61\u662fRedis\u5185\u6bcf\u4e00\u4e2akey\u7684\u72b6\u6001\uff0c\u6301\u4e45\u5316\u7684\u76ee\u7684\u662f\u4e3a\u4e86\u5728Reids\u53d1\u751f\u6545\u969c\u91cd\u542f\u540e\u80fd\u591f\u6062\u590d\u81f3\u91cd\u542f\u524d\u6216\u6545\u969c\u524d\u7684\u72b6\u6001\u3002\u76f8\u6bd4\u4e8eRDB\uff0cAOF\u91c7\u53d6\u7684\u7b56\u7565\u662f\u6309\u7167\u6267\u884c\u987a\u5e8f\u6301\u4e45\u5316\u6bcf\u4e00\u6761\u80fd\u591f\u5f15\u8d77Redis\u4e2d\u5bf9\u8c61\u72b6\u6001\u53d8\u66f4\u7684\u547d\u4ee4\uff0c\u547d\u4ee4\u662f\u6709\u5e8f\u7684\u3001\u6709\u9009\u62e9\u7684\u3002\u628aaof\u6587\u4ef6\u8f6c\u79fb\u81f3\u4efb\u4f55\u4e00\u53f0Redis Server\uff0c\u4ece\u5934\u5230\u5c3e\u6309\u5e8f\u91cd\u653e\u8fd9\u4e9b\u547d\u4ee4\u5373\u53ef\u6062\u590d\u5982\u521d\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n \u9996\u5148\u6267\u884c\u6307\u4ee4 \u56e0\u4e3a\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u80fd\u591f\u5f15\u8d77 \u6700\u672c\u8d28\u7684\u539f\u7406\u7528\u201c\u547d\u4ee4\u91cd\u653e\u201d\u56db\u4e2a\u5b57\u5c31\u53ef\u4ee5\u6982\u62ec\u3002\u4f46\u662f\uff0c\u8003\u8651\u5b9e\u9645\u751f\u4ea7\u73af\u5883\u7684\u590d\u6742\u6027\u53ca\u64cd\u4f5c\u7cfb\u7edf\u7b49\u65b9\u9762\u7684\u9650\u5236\uff0cRedis\u6240\u8981\u8003\u8651\u7684\u5de5\u4f5c\u8981\u6bd4\u8fd9\u4e2a\u4f8b\u5b50\u590d\u6742\u7684\u591a\uff1a<\/p>\n Redis Server\u542f\u52a8\u540e\uff0caof\u6587\u4ef6\u4e00\u76f4\u5728\u8ffd\u52a0\u547d\u4ee4\uff0c\u6587\u4ef6\u4f1a\u8d8a\u6765\u8d8a\u5927\u3002\u6587\u4ef6\u8d8a\u5927\uff0cRedis\u91cd\u542f\u540e\u6062\u590d\u8017\u65f6\u8d8a\u4e45\uff1b\u6587\u4ef6\u592a\u5927\uff0c\u8f6c\u79fb\u5de5\u4f5c\u5c31\u8d8a\u96be\uff1b\u4e0d\u52a0\u7ba1\u7406\uff0c\u53ef\u80fd\u6491\u7206\u786c\u76d8\u3002\u5f88\u663e\u7136\uff0c\u9700\u8981\u5728\u5408\u9002\u7684\u65f6\u673a\u5bf9\u6587\u4ef6\u8fdb\u884c\u7cbe\u7b80\u3002\u4f8b\u5b50\u4e2d\u76845\u6761incr\u6307\u4ee4\u5f88\u660e\u663e\u7684\u53ef\u4ee5\u66ff\u6362\u4e3a\u4e3a\u4e00\u6761 \u4f17\u6240\u5468\u77e5\uff0c\u6587\u4ef6I\/O\u662f\u64cd\u4f5c\u7cfb\u7edf\u6027\u80fd\u7684\u77ed\u677f\uff0c\u4e3a\u4e86\u63d0\u9ad8\u6548\u7387\uff0c\u6587\u4ef6\u7cfb\u7edf\u8bbe\u8ba1\u4e86\u4e00\u5957\u590d\u6742\u7684\u7f13\u5b58\u673a\u5236\uff0cRedis\u64cd\u4f5c\u547d\u4ee4\u7684\u8ffd\u52a0\u64cd\u4f5c\u53ea\u662f\u628a\u6570\u636e\u5199\u5165\u4e86\u7f13\u51b2\u533a\uff08aof_buf\uff09\uff0c\u4ece\u7f13\u51b2\u533a\u5230\u5199\u5165\u7269\u7406\u6587\u4ef6\u5728\u6027\u80fd\u4e0e\u5b89\u5168\u4e4b\u95f4\u6743\u8861\u4f1a\u6709\u4e0d\u540c\u7684\u9009\u62e9\u3002<\/p>\n<\/li>\n \u6587\u4ef6\u538b\u7f29\u5373\u610f\u5473\u7740\u91cd\u5199\uff0c\u91cd\u5199\u65f6\u5373\u53ef\u4f9d\u636e\u5df2\u6709\u7684aof\u6587\u4ef6\u505a\u547d\u4ee4\u6574\u5408\uff0c\u4e5f\u53ef\u4ee5\u5148\u6839\u636e\u5f53\u524dRedis\u5185\u6570\u636e\u7684\u72b6\u6001\u505a\u5feb\u7167\uff0c\u518d\u628a\u5b58\u50a8\u5feb\u7167\u8fc7\u7a0b\u4e2d\u7684\u65b0\u589e\u7684\u547d\u4ee4\u505a\u8ffd\u52a0\u3002<\/p>\n<\/li>\n aof\u5907\u4efd\u540e\u7684\u6587\u4ef6\u662f\u4e3a\u4e86\u6062\u590d\u6570\u636e\uff0c\u7ed3\u5408aof\u6587\u4ef6\u7684\u683c\u5f0f\u3001\u5b8c\u6574\u6027\u7b49\u56e0\u7d20\uff0cRedis\u4e5f\u8981\u8bbe\u8ba1\u4e00\u5957\u5b8c\u6574\u7684\u65b9\u6848\u505a\u652f\u6301\u3002<\/p>\n<\/li>\n<\/ul>\n \u4ece\u6d41\u7a0b\u4e0a\u6765\u770b\uff0cAOF\u7684\u5de5\u4f5c\u539f\u7406\u53ef\u4ee5\u6982\u62ec\u4e3a\u51e0\u4e2a\u6b65\u9aa4\uff1a\u547d\u4ee4\u8ffd\u52a0\uff08append\uff09\u3001\u6587\u4ef6\u5199\u5165\u4e0e\u540c\u6b65\uff08fsync\uff09\u3001\u6587\u4ef6\u91cd\u5199\uff08rewrite\uff09\u3001\u91cd\u542f\u52a0\u8f7d\uff08load\uff09\uff0c\u63a5\u4e0b\u6765\u4f9d\u6b21\u4e86\u89e3\u6bcf\u4e2a\u6b65\u9aa4\u7684\u7ec6\u8282\u53ca\u80cc\u540e\u7684\u8bbe\u8ba1\u54f2\u5b66\u3002 \u547d\u4ee4\u8ffd\u52a0<\/p>\n \u5f53 AOF \u6301\u4e45\u5316\u529f\u80fd\u5904\u4e8e\u6253\u5f00\u72b6\u6001\u65f6\uff0cRedis \u5728\u6267\u884c\u5b8c\u4e00\u4e2a\u5199\u547d\u4ee4\u4e4b\u540e\uff0c\u4f1a\u4ee5\u534f\u8bae\u683c\u5f0f(\u4e5f\u5c31\u662fRESP\uff0c\u5373 Redis \u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u4ea4\u4e92\u7684\u901a\u4fe1\u534f\u8bae )\u628a\u88ab\u6267\u884c\u7684\u5199\u547d\u4ee4\u8ffd\u52a0\u5230 Redis \u670d\u52a1\u7aef\u7ef4\u62a4\u7684 AOF \u7f13\u51b2\u533a\u672b\u5c3e\u3002\u5bf9AOF\u6587\u4ef6\u53ea\u6709\u5355\u7ebf\u7a0b\u7684\u8ffd\u52a0\u64cd\u4f5c\uff0c\u6ca1\u6709seek\u7b49\u590d\u6742\u7684\u64cd\u4f5c\uff0c\u5373\u4f7f\u65ad\u7535\u6216\u5b95\u673a\u4e5f\u4e0d\u5b58\u5728\u6587\u4ef6\u635f\u574f\u98ce\u9669\u3002\u53e6\u5916\uff0c\u4f7f\u7528\u6587\u672c\u534f\u8bae\u597d\u5904\u591a\u591a\uff1a<\/p>\n \u6587\u672c\u534f\u8bae\u6709\u5f88\u597d\u7684\u517c\u5bb9\u6027\uff1b<\/p>\n<\/li>\n \u6587\u672c\u534f\u8bae\u5c31\u662f\u5ba2\u6237\u7aef\u7684\u8bf7\u6c42\u547d\u4ee4\uff0c\u4e0d\u9700\u8981\u4e8c\u6b21\u5904\u7406\uff0c\u8282\u7701\u4e86\u5b58\u50a8\u53ca\u52a0\u8f7d\u65f6\u7684\u5904\u7406\u5f00\u9500\uff1b<\/p>\n<\/li>\n \u6587\u672c\u534f\u8bae\u5177\u6709\u53ef\u8bfb\u6027\uff0c\u65b9\u4fbf\u67e5\u770b\u3001\u4fee\u6539\u7b49\u5904\u7406\u3002<\/p>\n<\/li>\n<\/ul>\n AOF\u7f13\u51b2\u533a\u7c7b\u578b\u4e3aRedis\u81ea\u4e3b\u8bbe\u8ba1\u7684\u6570\u636e\u7ed3\u6784 \u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a\u5982\u679c\u547d\u4ee4\u8ffd\u52a0\u65f6\u6b63\u5728\u8fdb\u884cAOF\u91cd\u5199\uff0c\u8fd9\u4e9b\u547d\u4ee4\u8fd8\u4f1a\u8ffd\u52a0\u5230\u91cd\u5199\u7f13\u51b2\u533a\uff08 \u6587\u4ef6\u5199\u5165\u4e0e\u540c\u6b65<\/p>\n AOF\u6587\u4ef6\u7684\u5199\u5165\u4e0e\u540c\u6b65\u79bb\u4e0d\u5f00\u64cd\u4f5c\u7cfb\u7edf\u7684\u652f\u6301\uff0c\u5f00\u59cb\u4ecb\u7ecd\u4e4b\u524d\uff0c\u6211\u4eec\u9700\u8981\u8865\u5145\u4e00\u4e0bLinux I\/O\u7f13\u51b2\u533a\u76f8\u5173\u77e5\u8bc6\u3002\u786c\u76d8I\/O\u6027\u80fd\u8f83\u5dee\uff0c\u6587\u4ef6\u8bfb\u5199\u901f\u5ea6\u8fdc\u8fdc\u6bd4\u4e0d\u4e0aCPU\u7684\u5904\u7406\u901f\u5ea6\uff0c\u5982\u679c\u6bcf\u6b21\u6587\u4ef6\u5199\u5165\u90fd\u7b49\u5f85\u6570\u636e\u5199\u5165\u786c\u76d8\uff0c\u4f1a\u6574\u4f53\u62c9\u4f4e\u64cd\u4f5c\u7cfb\u7edf\u7684\u6027\u80fd\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u4e86\u5ef6\u8fdf\u5199\uff08delayed write\uff09\u673a\u5236\u6765\u63d0\u9ad8\u786c\u76d8\u7684I\/O\u6027\u80fd\u3002 \u4f20\u7edf\u7684UNIX\u5b9e\u73b0\u5728\u5185\u6838\u4e2d\u8bbe\u6709\u7f13\u51b2\u533a\u9ad8\u901f\u7f13\u5b58\u6216\u9875\u9762\u9ad8\u901f\u7f13\u5b58\uff0c\u5927\u591a\u6570\u78c1\u76d8I\/O\u90fd\u901a\u8fc7\u7f13\u51b2\u8fdb\u884c\u3002 \u5f53\u5c06\u6570\u636e\u5199\u5165\u6587\u4ef6\u65f6\uff0c\u5185\u6838\u901a\u5e38\u5148\u5c06\u8be5\u6570\u636e\u590d\u5236\u5230\u5176\u4e2d\u4e00\u4e2a\u7f13\u51b2\u533a\u4e2d\uff0c\u5982\u679c\u8be5\u7f13\u51b2\u533a\u5c1a\u672a\u5199\u6ee1\uff0c\u5219\u5e76\u4e0d\u5c06\u5176\u6392\u5165\u8f93\u51fa\u961f\u5217\uff0c\u800c\u662f\u7b49\u5f85\u5176\u5199\u6ee1\u6216\u8005\u5f53\u5185\u6838\u9700\u8981\u91cd\u7528\u8be5\u7f13\u51b2\u533a\u4ee5\u4fbf\u5b58\u653e\u5176\u4ed6\u78c1\u76d8\u5757\u6570\u636e\u65f6\uff0c \u518d\u5c06\u8be5\u7f13\u51b2\u6392\u5165\u5230\u8f93\u51fa\u961f\u5217\uff0c\u7136\u540e\u5f85\u5176\u5230\u8fbe\u961f\u9996\u65f6\uff0c\u624d\u8fdb\u884c\u5b9e\u9645\u7684I\/O\u64cd\u4f5c\u3002\u8fd9\u79cd\u8f93\u51fa\u65b9\u5f0f\u5c31\u88ab\u79f0\u4e3a\u5ef6\u8fdf\u5199\u3002<\/p>\n<\/blockquote>\n \u5ef6\u8fdf\u5199\u51cf\u5c11\u4e86\u78c1\u76d8\u8bfb\u5199\u6b21\u6570\uff0c\u4f46\u662f\u5374\u964d\u4f4e\u4e86\u6587\u4ef6\u5185\u5bb9\u7684\u66f4\u65b0\u901f\u5ea6\uff0c\u4f7f\u5f97\u6b32\u5199\u5230\u6587\u4ef6\u4e2d\u7684\u6570\u636e\u5728\u4e00\u6bb5\u65f6\u95f4\u5185\u5e76\u6ca1\u6709\u5199\u5230\u78c1\u76d8\u4e0a\u3002\u5f53\u7cfb\u7edf\u53d1\u751f\u6545\u969c\u65f6\uff0c\u8fd9\u79cd\u5ef6\u8fdf\u53ef\u80fd\u9020\u6210\u6587\u4ef6\u66f4\u65b0\u5185\u5bb9\u7684\u4e22\u5931\u3002\u4e3a\u4e86\u4fdd\u8bc1\u78c1\u76d8\u4e0a\u5b9e\u9645\u6587\u4ef6\u7cfb\u7edf\u4e0e\u7f13\u51b2\u533a\u9ad8\u901f\u7f13\u5b58\u4e2d\u5185\u5bb9\u7684\u4e00\u81f4\u6027\uff0cUNIX\u7cfb\u7edf\u63d0\u4f9b\u4e86sync\u3001fsync\u548cfdatasync\u4e09\u4e2a\u51fd\u6570\u4e3a\u5f3a\u5236\u5199\u5165\u786c\u76d8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n Redis\u6bcf\u6b21\u4e8b\u4ef6\u8f6e\u8bad\u7ed3\u675f\u524d\uff08 always\uff1a\u6bcf\u6b21\u90fd\u8c03\u7528 no\uff1a\u4e0d\u4f1a\u8c03\u7528 everysec\uff1a\u4ec5\u5728\u6ee1\u8db3\u540c\u6b65\u6761\u4ef6\u65f6\u8c03\u7528 \u6ce8\u610f\uff1a\u4e0a\u9762\u4ecb\u7ecd\u7684\u7b56\u7565\u53d7\u914d\u7f6e\u9879 \u5982\u679c \u4e3a\u4e86\u7f13\u89e3\u6b64\u95ee\u9898\uff0c\u53ef\u4ee5\u4f7f\u7528\u8be5\u9009\u9879\uff0c\u4ee5\u9632\u6b62\u5728\u8fdb\u884c \u8bbe\u7f6e\u4e3a \u5982\u679c\u4f60\u7684\u7cfb\u7edf\u6709\u4e0a\u9762\u63cf\u8ff0\u7684\u5ef6\u8fdf\u95ee\u9898\uff0c\u5c31\u628a\u8fd9\u4e2a\u9009\u9879\u8bbe\u7f6e\u4e3a \u6587\u4ef6\u91cd\u5199<\/p>\n \u5982\u524d\u9762\u63d0\u5230\u7684\uff0cRedis\u957f\u65f6\u95f4\u8fd0\u884c\uff0c\u547d\u4ee4\u4e0d\u65ad\u5199\u5165AOF\uff0c\u6587\u4ef6\u4f1a\u8d8a\u6765\u8d8a\u5927\uff0c\u4e0d\u52a0\u63a7\u5236\u53ef\u80fd\u5f71\u54cd\u5bbf\u4e3b\u673a\u7684\u5b89\u5168\u3002<\/p>\n \u4e3a\u4e86\u89e3\u51b3AOF\u6587\u4ef6\u4f53\u79ef\u95ee\u9898\uff0cRedis\u5f15\u5165\u4e86AOF\u6587\u4ef6\u91cd\u5199\u529f\u80fd\uff0c\u5b83\u4f1a\u6839\u636eRedis\u5185\u6570\u636e\u5bf9\u8c61\u7684\u6700\u65b0\u72b6\u6001\u751f\u6210\u65b0\u7684AOF\u6587\u4ef6\uff0c\u65b0\u65e7\u6587\u4ef6\u5bf9\u5e94\u7684\u6570\u636e\u72b6\u6001\u4e00\u81f4\uff0c\u4f46\u662f\u65b0\u6587\u4ef6\u4f1a\u5177\u6709\u8f83\u5c0f\u7684\u4f53\u79ef\u3002\u91cd\u5199\u65e2\u51cf\u5c11\u4e86AOF\u6587\u4ef6\u5bf9\u78c1\u76d8\u7a7a\u95f4\u7684\u5360\u7528\uff0c\u53c8\u53ef\u4ee5\u63d0\u9ad8Redis\u91cd\u542f\u65f6\u6570\u636e\u6062\u590d\u7684\u901f\u5ea6\u3002\u8fd8\u662f\u4e0b\u9762\u8fd9\u4e2a\u4f8b\u5b50\uff0c\u65e7\u6587\u4ef6\u4e2d\u76846\u6761\u547d\u4ee4\u7b49\u540c\u4e8e\u65b0\u6587\u4ef6\u4e2d\u76841\u6761\u547d\u4ee4\uff0c\u538b\u7f29\u6548\u679c\u663e\u800c\u6613\u89c1\u3002 auto-aof-rewrite-percentage\uff1a\u4ee3\u8868\u5f53\u524dAOF\u6587\u4ef6\u5927\u5c0f\uff08aof_current_size\uff09\u548c\u4e0a\u4e00\u6b21\u91cd\u5199\u540eAOF\u6587\u4ef6\u5927\u5c0f\uff08aof_base_size\uff09\u76f8\u6bd4\uff0c\u589e\u957f\u7684\u6bd4\u4f8b\u3002<\/p>\n<\/li>\n auto-aof-rewrite-min-size\uff1a\u8868\u793a\u8fd0\u884c Redis\u542f\u52a8\u65f6\u628a \u624b\u52a8\u89e6\u53d1\u4e0e\u81ea\u52a8\u89e6\u53d1\u7684\u4ee3\u7801\u5982\u4e0b\uff0c\u540c\u6837\u5728\u5468\u671f\u6027\u65b9\u6cd5 AOF\u6587\u4ef6\u91cd\u5199\u7684\u6d41\u7a0b\u662f\u4ec0\u4e48\uff1f\u542c\u8bf4Redis\u652f\u6301\u6df7\u5408\u6301\u4e45\u5316\uff0c\u5bf9AOF\u6587\u4ef6\u91cd\u5199\u6709\u4ec0\u4e48\u5f71\u54cd\uff1f<\/strong><\/p>\n \u4ece4.0\u7248\u672c\u5f00\u59cb\uff0cRedis\u5728AOF\u6a21\u5f0f\u4e2d\u5f15\u5165\u4e86\u6df7\u5408\u6301\u4e45\u5316\u65b9\u6848\uff0c\u5373\uff1a\u7eafAOF\u65b9\u5f0f\u3001RDB+AOF\u65b9\u5f0f\uff0c\u8fd9\u4e00\u7b56\u7565\u7531\u914d\u7f6e\u53c2\u6570 no\uff1a\u6309\u7167AOF\u683c\u5f0f\u5199\u5165\u547d\u4ee4\uff0c\u4e0e4.0\u524d\u7248\u672c\u65e0\u5dee\u522b\uff1b<\/p>\n<\/li>\n yes\uff1a\u5148\u6309\u7167RDB\u683c\u5f0f\u5199\u5165\u6570\u636e\u72b6\u6001\uff0c\u7136\u540e\u628a\u91cd\u5199\u671f\u95f4AOF\u7f13\u51b2\u533a\u7684\u5185\u5bb9\u4ee5AOF\u683c\u5f0f\u5199\u5165\uff0c\u6587\u4ef6\u524d\u534a\u90e8\u5206\u4e3aRDB\u683c\u5f0f\uff0c\u540e\u534a\u90e8\u5206\u4e3aAOF\u683c\u5f0f\u3002<\/p>\n<\/li>\n<\/ul>\n \u7ed3\u5408\u6e90\u7801\uff086.0\u7248\u672c\uff0c\u6e90\u7801\u592a\u591a\u8fd9\u91cc\u4e0d\u8d34\u51fa\uff0c\u53ef\u53c2\u8003 rewriteAppendOnlyFileBackground\u5f00\u59cb\u6267\u884c\uff0c\u68c0\u67e5\u662f\u5426\u6709\u6b63\u5728\u8fdb\u884c\u7684AOF\u91cd\u5199\u6216RDB\u6301\u4e45\u5316\u5b50\u8fdb\u7a0b\uff1a\u5982\u679c\u6709\uff0c\u5219\u9000\u51fa\u8be5\u6d41\u7a0b\uff1b\u5982\u679c\u6ca1\u6709\uff0c\u5219\u7ee7\u7eed\u521b\u5efa\u63a5\u4e0b\u6765\u7236\u5b50\u8fdb\u7a0b\u95f4\u6570\u636e\u4f20\u8f93\u7684\u901a\u4fe1\u7ba1\u9053\u3002\u6267\u884cfork()\u64cd\u4f5c\uff0c\u6210\u529f\u540e\u7236\u5b50\u8fdb\u7a0b\u5206\u522b\u6267\u884c\u4e0d\u540c\u7684\u6d41\u7a0b\u3002<\/p>\n<\/li>\n \u7236\u8fdb\u7a0b\uff1a<\/p>\n<\/li>\n \u8bb0\u5f55\u5b50\u8fdb\u7a0b\u4fe1\u606f\uff08pid\uff09\u3001\u65f6\u95f4\u6233\u7b49\uff1b<\/p>\n<\/li>\n \u7ee7\u7eed\u54cd\u5e94\u5176\u4ed6\u5ba2\u6237\u7aef\u8bf7\u6c42\uff1b<\/p>\n<\/li>\n \u6536\u96c6AOF\u91cd\u5199\u671f\u95f4\u7684\u547d\u4ee4\uff0c\u8ffd\u52a0\u81f3aof_rewrite_buffer\uff1b<\/p>\n<\/li>\n \u7b49\u5f85\u5e76\u5411\u5b50\u8fdb\u7a0b\u540c\u6b65aof_rewrite_buffer\u7684\u5185\u5bb9\uff1b<\/p>\n<\/li>\n<\/ul>\n \u5b50\u8fdb\u7a0b\uff1a<\/p>\n<\/li>\n \u4fee\u6539\u5f53\u524d\u8fdb\u7a0b\u540d\u79f0\uff0c\u521b\u5efa\u91cd\u5199\u6240\u9700\u7684\u4e34\u65f6\u6587\u4ef6\uff0c\u8c03\u7528rewriteAppendOnlyFile\u51fd\u6570\uff1b<\/p>\n<\/li>\n \u6839\u636e \u4ece\u7236\u8fdb\u7a0b\u63a5\u6536\u589e\u91cfAOF\u547d\u4ee4\uff0c\u4ee5AOF\u65b9\u5f0f\u5199\u5165\u540e\u534a\u90e8\u5206\uff0c\u5e76\u540c\u6b65\u81f3\u786c\u76d8\uff1b<\/p>\n<\/li>\n \u91cd\u547d\u540dAOF\u6587\u4ef6\uff0c\u5b50\u8fdb\u7a0b\u9000\u51fa\u3002<\/p>\n<\/li>\n<\/ul>\n<\/ul>\n Redis\u542f\u52a8\u540e\u901a\u8fc7 \u7406\u8bba\u4e0a\uff0cAOF\u6301\u4e45\u5316\u6bd4RDB\u5177\u6709\u66f4\u597d\u7684\u5b9e\u65f6\u6027\uff0c\u5f53\u5f00\u542f\u4e86AOF\u6301\u4e45\u5316\u65b9\u5f0f\uff0cRedis\u5728\u6570\u636e\u52a0\u8f7d\u65f6\u4f18\u5148\u8003\u8651AOF\u65b9\u5f0f\u3002\u800c\u4e14\uff0cRedis 4.0\u7248\u672c\u540eAOF\u652f\u6301\u4e86\u6df7\u5408\u6301\u4e45\u5316\uff0c\u52a0\u8f7dAOF\u6587\u4ef6\u9700\u8981\u8003\u8651\u7248\u672c\u517c\u5bb9\u6027\u3002Redis\u6570\u636e\u52a0\u8f7d\u6d41\u7a0b\u5982\u4e0b\u56fe\u6240\u793a\uff1a \u5982\u679c\u5728AOF\u547d\u4ee4\u8ffd\u52a0\u8fc7\u7a0b\u4e2d\u53d1\u751f\u5b95\u673a\uff0c\u7531\u4e8e\u5ef6\u8fdf\u5199\u7684\u6280\u672f\u7279\u70b9\uff0cAOF\u7684RESP\u547d\u4ee4\u53ef\u80fd\u4e0d\u5b8c\u6574\uff08\u88ab\u622a\u65ad\uff09\u3002\u9047\u5230\u8fd9\u79cd\u60c5\u51b5\u65f6\uff0cRedis\u4f1a\u6309\u7167\u914d\u7f6e\u9879 yes\uff1a\u5219\u5c3d\u53ef\u80fd\u591a\u7684\u52a0\u8f7d\u6570\u636e\uff0c\u5e76\u4ee5\u65e5\u5fd7\u7684\u65b9\u5f0f\u901a\u77e5\u7528\u6237\uff1b<\/p>\n<\/li>\n no\uff1a\u5219\u4ee5\u7cfb\u7edf\u9519\u8bef\u7684\u65b9\u5f0f\u5d29\u6e83\uff0c\u5e76\u7981\u6b62\u542f\u52a8\uff0c\u9700\u8981\u7528\u6237\u4fee\u590d\u6587\u4ef6\u540e\u518d\u91cd\u542f\u3002<\/p>\n<\/li>\n<\/ul>\n Redis\u63d0\u4f9b\u4e86\u4e24\u79cd\u6301\u4e45\u5316\u7684\u9009\u62e9\uff1aRDB\u652f\u6301\u4ee5\u7279\u5b9a\u7684\u5b9e\u8df5\u95f4\u9694\u4e3a\u6570\u636e\u96c6\u751f\u6210\u65f6\u95f4\u70b9\u5feb\u7167\uff1bAOF\u628aRedis Server\u6536\u5230\u7684\u6bcf\u6761\u5199\u6307\u4ee4\u6301\u4e45\u5316\u5230\u65e5\u5fd7\u4e2d\uff0c\u5f85Redis\u91cd\u542f\u65f6\u901a\u8fc7\u91cd\u653e\u547d\u4ee4\u6062\u590d\u6570\u636e\u3002\u65e5\u5fd7\u683c\u5f0f\u4e3aRESP\u534f\u8bae\uff0c\u5bf9\u65e5\u5fd7\u6587\u4ef6\u53ea\u505aappend\u64cd\u4f5c\uff0c\u65e0\u635f\u574f\u98ce\u9669\u3002\u5e76\u4e14\u5f53AOF\u6587\u4ef6\u8fc7\u5927\u65f6\u53ef\u4ee5\u81ea\u52a8\u91cd\u5199\u538b\u7f29\u6587\u4ef6\u3002<\/p>\n \u5f53\u7136\uff0c\u5982\u679c\u4f60\u4e0d\u9700\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u6301\u4e45\u5316\uff0c\u4e5f\u53ef\u4ee5\u7981\u7528Redis\u7684\u6301\u4e45\u5316\u529f\u80fd\uff0c\u4f46\u662f\u5927\u591a\u6570\u60c5\u51b5\u5e76\u975e\u5982\u6b64\u3002\u5b9e\u9645\u4e0a\uff0c\u6211\u4eec\u65f6\u6709\u53ef\u80fd\u540c\u65f6\u4f7f\u7528RDB\u548cAOF\u4e24\u79cd\u65b9\u5f0f\u7684\uff0c\u6700\u91cd\u8981\u7684\u5c31\u662f\u6211\u4eec\u8981\u7406\u89e3\u4e24\u8005\u7684\u533a\u522b\uff0c\u4ee5\u4fbf\u5408\u7406\u4f7f\u7528\u3002<\/p>\n RDB\u4f18\u70b9<\/p>\n RDB\u662f\u4e00\u4e2a\u7d27\u51d1\u538b\u7f29\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\uff0c\u4ee3\u8868Redis\u5728\u67d0\u4e00\u4e2a\u65f6\u95f4\u70b9\u4e0a\u7684\u6570\u636e\u5feb\u7167\uff0c\u975e\u5e38\u9002\u5408\u7528\u4e8e\u5907\u4efd\u3001\u5168\u91cf\u590d\u5236\u7b49\u573a\u666f\u3002<\/p>\n<\/li>\n RDB\u5bf9\u707e\u96be\u6062\u590d\u3001\u6570\u636e\u8fc1\u79fb\u975e\u5e38\u53cb\u597d\uff0cRDB\u6587\u4ef6\u53ef\u4ee5\u8f6c\u79fb\u81f3\u4efb\u4f55\u9700\u8981\u7684\u5730\u65b9\u5e76\u91cd\u65b0\u52a0\u8f7d\u3002<\/p>\n<\/li>\n RDB\u662fRedis\u6570\u636e\u7684\u5185\u5b58\u5feb\u7167\uff0c\u6570\u636e\u6062\u590d\u901f\u5ea6\u8f83\u5feb\uff0c\u76f8\u6bd4\u4e8eAOF\u7684\u547d\u4ee4\u91cd\u653e\u6709\u7740\u66f4\u9ad8\u7684\u6027\u80fd\u3002<\/p>\n<\/li>\n<\/ul>\n RDB\u7f3a\u70b9<\/p>\n RDB\u65b9\u5f0f\u65e0\u6cd5\u505a\u5230\u5b9e\u65f6\u6216\u79d2\u7ea7\u6301\u4e45\u5316\u3002\u56e0\u4e3a\u6301\u4e45\u5316\u8fc7\u7a0b\u662f\u901a\u8fc7fork\u5b50\u8fdb\u7a0b\u540e\u7531\u5b50\u8fdb\u7a0b\u5b8c\u6210\u7684\uff0c\u5b50\u8fdb\u7a0b\u7684\u5185\u5b58\u53ea\u662f\u5728fork\u64cd\u4f5c\u90a3\u4e00\u65f6\u523b\u7236\u8fdb\u7a0b\u7684\u6570\u636e\u5feb\u7167\uff0c\u800cfork\u64cd\u4f5c\u540e\u7236\u8fdb\u7a0b\u6301\u7eed\u5bf9\u5916\u670d\u52a1\uff0c\u5185\u90e8\u6570\u636e\u65f6\u523b\u53d8\u66f4\uff0c\u5b50\u8fdb\u7a0b\u7684\u6570\u636e\u4e0d\u518d\u66f4\u65b0\uff0c\u4e24\u8005\u59cb\u7ec8\u5b58\u5728\u5dee\u5f02\uff0c\u6240\u4ee5\u65e0\u6cd5\u505a\u5230\u5b9e\u65f6\u6027\u3002<\/p>\n<\/li>\n RDB\u6301\u4e45\u5316\u8fc7\u7a0b\u4e2d\u7684fork\u64cd\u4f5c\uff0c\u4f1a\u5bfc\u81f4\u5185\u5b58\u5360\u7528\u52a0\u500d\uff0c\u800c\u4e14\u7236\u8fdb\u7a0b\u6570\u636e\u8d8a\u591a\uff0cfork\u8fc7\u7a0b\u8d8a\u957f\u3002<\/p>\n<\/li>\n Redis\u8bf7\u6c42\u9ad8\u5e76\u53d1\u53ef\u80fd\u4f1a\u9891\u7e41\u547d\u4e2dsave\u89c4\u5219\uff0c\u5bfc\u81f4fork\u64cd\u4f5c\u53ca\u6301\u4e45\u5316\u5907\u4efd\u7684\u9891\u7387\u4e0d\u53ef\u63a7\uff1b<\/p>\n<\/li>\n RDB\u6587\u4ef6\u6709\u6587\u4ef6\u683c\u5f0f\u8981\u6c42\uff0c\u4e0d\u540c\u7248\u672c\u7684Redis\u4f1a\u5bf9\u6587\u4ef6\u683c\u5f0f\u8fdb\u884c\u8c03\u6574\uff0c\u5b58\u5728\u8001\u7248\u672c\u65e0\u6cd5\u517c\u5bb9\u65b0\u7248\u672c\u7684\u95ee\u9898\u3002<\/p>\n<\/li>\n<\/ul>\n AOF\u4f18\u70b9<\/p>\n AOF\u6301\u4e45\u5316\u6709\u66f4\u597d\u7684\u5b9e\u65f6\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u9009\u62e9\u4e09\u79cd\u4e0d\u540c\u7684\u65b9\u5f0f\uff08appendfsync\uff09\uff1ano\u3001every second\u3001always\uff0cevery second\u4f5c\u4e3a\u9ed8\u8ba4\u7684\u7b56\u7565\u5177\u6709\u6700\u597d\u7684\u6027\u80fd\uff0c\u6781\u7aef\u60c5\u51b5\u4e0b\u53ef\u80fd\u4f1a\u4e22\u5931\u4e00\u79d2\u7684\u6570\u636e\u3002<\/p>\n<\/li>\n AOF\u6587\u4ef6\u53ea\u6709append\u64cd\u4f5c\uff0c\u65e0\u590d\u6742\u7684seek\u7b49\u6587\u4ef6\u64cd\u4f5c\uff0c\u6ca1\u6709\u635f\u574f\u98ce\u9669\u3002\u5373\u4f7f\u6700\u540e\u5199\u5165\u6570\u636e\u88ab\u622a\u65ad\uff0c\u4e5f\u5f88\u5bb9\u6613\u4f7f\u7528 \u5f53AOF\u6587\u4ef6\u53d8\u5927\u65f6\uff0cRedis\u53ef\u5728\u540e\u53f0\u81ea\u52a8\u91cd\u5199\u3002\u91cd\u5199\u8fc7\u7a0b\u4e2d\u65e7\u6587\u4ef6\u4f1a\u6301\u7eed\u5199\u5165\uff0c\u91cd\u5199\u5b8c\u6210\u540e\u65b0\u6587\u4ef6\u5c06\u53d8\u5f97\u66f4\u5c0f\uff0c\u5e76\u4e14\u91cd\u5199\u8fc7\u7a0b\u4e2d\u7684\u589e\u91cf\u547d\u4ee4\u4e5f\u4f1aappend\u5230\u65b0\u6587\u4ef6\u3002<\/p>\n<\/li>\n AOF\u6587\u4ef6\u4ee5\u5df2\u4e8e\u7406\u89e3\u4e0e\u89e3\u6790\u7684\u65b9\u5f0f\u5305\u542b\u4e86\u5bf9Redis\u4e2d\u6570\u636e\u7684\u6240\u6709\u64cd\u4f5c\u547d\u4ee4\u3002\u5373\u4f7f\u4e0d\u5c0f\u5fc3\u9519\u8bef\u7684\u6e05\u9664\u4e86\u6240\u6709\u6570\u636e\uff0c\u53ea\u8981\u6ca1\u6709\u5bf9AOF\u6587\u4ef6\u91cd\u5199\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u901a\u8fc7\u79fb\u9664\u6700\u540e\u4e00\u6761\u547d\u4ee4\u627e\u56de\u6240\u6709\u6570\u636e\u3002<\/p>\n<\/li>\n AOF\u5df2\u7ecf\u652f\u6301\u6df7\u5408\u6301\u4e45\u5316\uff0c\u6587\u4ef6\u5927\u5c0f\u53ef\u4ee5\u6709\u6548\u63a7\u5236\uff0c\u5e76\u63d0\u9ad8\u4e86\u6570\u636e\u52a0\u8f7d\u65f6\u7684\u6548\u7387\u3002<\/p>\n<\/li>\n<\/ul>\n AOF\u7f3a\u70b9<\/p>\n \u5bf9\u4e8e\u76f8\u540c\u7684\u6570\u636e\u96c6\u5408\uff0cAOF\u6587\u4ef6\u901a\u5e38\u4f1a\u6bd4RDB\u6587\u4ef6\u5927\uff1b<\/p>\n<\/li>\n \u5728\u7279\u5b9a\u7684fsync\u7b56\u7565\u4e0b\uff0cAOF\u4f1a\u6bd4RDB\u7565\u6162\u3002\u4e00\u822c\u6765\u8bb2\uff0cfsync_every_second\u7684\u6027\u80fd\u4ecd\u7136\u5f88\u9ad8\uff0cfsync_no\u7684\u6027\u80fd\u4e0eRDB\u76f8\u5f53\u3002\u4f46\u662f\u5728\u5de8\u5927\u7684\u5199\u538b\u529b\u4e0b\uff0cRDB\u66f4\u80fd\u63d0\u4f9b\u6700\u5927\u7684\u4f4e\u5ef6\u65f6\u4fdd\u969c\u3002<\/p>\n<\/li>\n \u5728AOF\u4e0a\uff0cRedis\u66fe\u7ecf\u9047\u5230\u4e00\u4e9b\u51e0\u4e4e\u4e0d\u53ef\u80fd\u5728RDB\u4e0a\u9047\u5230\u7684\u7f55\u89c1bug\u3002\u4e00\u4e9b\u7279\u6b8a\u7684\u6307\u4ee4\uff08\u5982BRPOPLPUSH\uff09\u5bfc\u81f4\u91cd\u65b0\u52a0\u8f7d\u7684\u6570\u636e\u4e0e\u6301\u4e45\u5316\u4e4b\u524d\u4e0d\u4e00\u81f4\uff0cRedis\u5b98\u65b9\u66fe\u7ecf\u5728\u76f8\u540c\u7684\u6761\u4ef6\u4e0b\u8fdb\u884c\u6d4b\u8bd5\uff0c\u4f46\u662f\u65e0\u6cd5\u590d\u73b0\u95ee\u9898\u3002<\/p>\n<\/li>\n<\/ul>\n \u5bf9RDB\u548cAOF\u4e24\u79cd\u6301\u4e45\u5316\u65b9\u5f0f\u7684\u5de5\u4f5c\u539f\u7406\u3001\u6267\u884c\u6d41\u7a0b\u53ca\u4f18\u7f3a\u70b9\u4e86\u89e3\u540e\uff0c\u6211\u4eec\u6765\u601d\u8003\u4e0b\uff0c\u5b9e\u9645\u573a\u666f\u4e2d\u5e94\u8be5\u600e\u4e48\u6743\u8861\u5229\u5f0a\uff0c\u5408\u7406\u7684\u4f7f\u7528\u4e24\u79cd\u6301\u4e45\u5316\u65b9\u5f0f\u3002\u5982\u679c\u4ec5\u4ec5\u662f\u4f7f\u7528Redis\u4f5c\u4e3a\u7f13\u5b58\u5de5\u5177\uff0c\u6240\u6709\u6570\u636e\u53ef\u4ee5\u6839\u636e\u6301\u4e45\u5316\u6570\u636e\u5e93\u8fdb\u884c\u91cd\u5efa\uff0c\u5219\u53ef\u5173\u95ed\u6301\u4e45\u5316\u529f\u80fd\uff0c\u505a\u597d\u9884\u70ed\u3001\u7f13\u5b58\u7a7f\u900f\u3001\u51fb\u7a7f\u3001\u96ea\u5d29\u4e4b\u7c7b\u7684\u9632\u62a4\u5de5\u4f5c\u5373\u53ef\u3002<\/p>\n \u4e00\u822c\u60c5\u51b5\u4e0b\uff0cRedis\u4f1a\u627f\u62c5\u66f4\u591a\u7684\u5de5\u4f5c\uff0c\u5982\u5206\u5e03\u5f0f\u9501\u3001\u6392\u884c\u699c\u3001\u6ce8\u518c\u4e2d\u5fc3\u7b49\uff0c\u6301\u4e45\u5316\u529f\u80fd\u5728\u707e\u96be\u6062\u590d\u3001\u6570\u636e\u8fc1\u79fb\u65b9\u9762\u5c06\u53d1\u6325\u8f83\u5927\u7684\u4f5c\u7528\u3002\u5efa\u8bae\u9075\u5faa\u51e0\u4e2a\u539f\u5219\uff1a<\/p>\n \u4e0d\u8981\u628aRedis\u4f5c\u4e3a\u6570\u636e\u5e93\uff0c\u6240\u6709\u6570\u636e\u5c3d\u53ef\u80fd\u53ef\u7531\u5e94\u7528\u670d\u52a1\u81ea\u52a8\u91cd\u5efa\u3002<\/p>\n<\/li>\n \u4f7f\u75284.0\u4ee5\u4e0a\u7248\u672cRedis\uff0c\u4f7f\u7528AOF+RDB\u6df7\u5408\u6301\u4e45\u5316\u529f\u80fd\u3002<\/p>\n<\/li>\n \u5408\u7406\u89c4\u5212Redis\u6700\u5927\u5360\u7528\u5185\u5b58\uff0c\u9632\u6b62AOF\u91cd\u5199\u6216save\u8fc7\u7a0b\u4e2d\u8d44\u6e90\u4e0d\u8db3\u3002<\/p>\n<\/li>\n \u907f\u514d\u5355\u673a\u90e8\u7f72\u591a\u5b9e\u4f8b\u3002<\/p>\n<\/li>\n \u751f\u4ea7\u73af\u5883\u591a\u4e3a\u96c6\u7fa4\u5316\u90e8\u7f72\uff0c\u53ef\u5728slave\u5f00\u542f\u6301\u4e45\u5316\u80fd\u529b\uff0c\u8ba9master\u66f4\u597d\u7684\u5bf9\u5916\u63d0\u4f9b\u5199\u670d\u52a1\u3002<\/p>\n<\/li>\n \u5907\u4efd\u6587\u4ef6\u5e94\u81ea\u52a8\u4e0a\u4f20\u81f3\u5f02\u5730\u673a\u623f\u6216\u4e91\u5b58\u50a8\uff0c\u505a\u597d\u707e\u96be\u5907\u4efd\u3002<\/strong><\/p>\n<\/li>\n<\/ul>\n \u901a\u8fc7\u4e0a\u9762\u7684\u5206\u6790\uff0c\u6211\u4eec\u90fd\u77e5\u9053RDB\u7684\u5feb\u7167\u3001AOF\u7684\u91cd\u5199\u90fd\u9700\u8981fork\uff0c\u8fd9\u662f\u4e00\u4e2a\u91cd\u91cf\u7ea7\u64cd\u4f5c\uff0c\u4f1a\u5bf9Redis\u9020\u6210\u963b\u585e\u3002\u56e0\u6b64\u4e3a\u4e86\u4e0d\u5f71\u54cdRedis\u4e3b\u8fdb\u7a0b\u54cd\u5e94\uff0c\u6211\u4eec\u9700\u8981\u5c3d\u53ef\u80fd\u964d\u4f4e\u963b\u585e\u3002<\/p>\n \u964d\u4f4efork\u7684\u9891\u7387\uff0c\u6bd4\u5982\u53ef\u4ee5\u624b\u52a8\u6765\u89e6\u53d1RDB\u751f\u6210\u5feb\u7167\u3001\u4e0eAOF\u91cd\u5199\uff1b<\/p>\n<\/li>\n \u63a7\u5236Redis\u6700\u5927\u4f7f\u7528\u5185\u5b58\uff0c\u9632\u6b62fork\u8017\u65f6\u8fc7\u957f\uff1b<\/p>\n<\/li>\n \u4f7f\u7528\u66f4\u9ad8\u6027\u80fd\u7684\u786c\u4ef6\uff1b<\/p>\n<\/li>\n \u5408\u7406\u914d\u7f6eLinux\u7684\u5185\u5b58\u5206\u914d\u7b56\u7565\uff0c\u907f\u514d\u56e0\u4e3a\u7269\u7406\u5185\u5b58\u4e0d\u8db3\u5bfc\u81f4fork\u5931\u8d25<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":" Redis\u6301\u4e45\u5316\u539f\u7406\u5b9e\u4f8b\u5206\u6790 \u6536...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-202354","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202354","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202354"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202354\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202354"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202354"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202354"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![](\"https:\/\/www.17golang.com\/uploads\/20240418\/1713439649662103a14deec.jpg\")
<\/p>\nRDB\u6301\u4e45\u5316<\/h3>\n
RDB\u5de5\u4f5c\u539f\u7406<\/h4>\n
redisDb<\/code>\u5bf9\u8c61\u6765\u8868\u793a\uff0credisDb<\/code>\u4f7f\u7528hashtable\u5b58\u50a8K-V\u5bf9\u8c61\u3002\u4e3a\u65b9\u4fbf\u7406\u89e3\uff0c\u6211\u4ee5\u5176\u4e2d\u4e00\u4e2adb\u4e3a\u4f8b\u7ed8\u5236Redis\u5185\u90e8\u6570\u636e\u7684\u5b58\u50a8\u7ed3\u6784\u793a\u610f\u56fe\u3002 ![](\"https:\/\/www.17golang.com\/uploads\/20240418\/1713439649662103a14f733.jpg\")
\u65f6\u95f4\u70b9\u5feb\u7167\u4e5f\u5c31\u662f\u67d0\u4e00\u65f6\u523bRedis\u5185\u6bcf\u4e2aDB\u4e2d\u6bcf\u4e2a\u6570\u636e\u5bf9\u8c61\u7684\u72b6\u6001\uff0c\u5148\u5047\u8bbe\u5728\u8fd9\u4e00\u65f6\u523b\u6240\u6709\u7684\u6570\u636e\u5bf9\u8c61\u4e0d\u518d\u6539\u53d8<\/strong>\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u6309\u7167\u4e0a\u56fe\u4e2d\u7684\u6570\u636e\u7ed3\u6784\u5173\u7cfb\uff0c\u628a\u8fd9\u4e9b\u6570\u636e\u5bf9\u8c61\u4f9d\u6b21\u8bfb\u53d6\u51fa\u6765\u5e76\u5199\u5165\u5230\u6587\u4ef6\u4e2d\uff0c\u4ee5\u6b64\u5b9e\u73b0Redis\u7684\u6301\u4e45\u5316\u3002\u7136\u540e\uff0c\u5f53Redis\u91cd\u542f\u65f6\u6309\u7167\u89c4\u5219\u8bfb\u53d6\u8fd9\u4e2a\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\uff0c\u518d\u5199\u5165\u5230Redis\u5185\u5b58\u5373\u53ef\u6062\u590d\u81f3\u6301\u4e45\u5316\u65f6\u7684\u72b6\u6001\u3002<\/p>\n\u6301\u4e45\u5316\u6d41\u7a0b<\/h4>\n
\n
\n
save m n<\/code>\u914d\u7f6e\u89c4\u5219\u81ea\u52a8\u89e6\u53d1\uff1b<\/p>\n<\/li>\ndebug reload<\/code>\u547d\u4ee4\u91cd\u65b0\u52a0\u8f7dredis\u65f6\uff1b<\/p>\n<\/li>\n![](\"https:\/\/www.17golang.com\/uploads\/20240418\/1713439649662103a152a09.jpg\")
\u4ece\u4e0a\u56fe\u53ef\u4ee5\u77e5\u9053\uff1a<\/p>\n\n
rdbSave<\/code>\u65b9\u6cd5\u5b8c\u6210\u7684\u3002<\/p>\n<\/li>\n<\/ul>\nredisServer<\/code>\u4e2d\u6709\u51e0\u4e2a\u4e0eRDB\u6301\u4e45\u5316\u6709\u5173\u7684\u5b57\u6bb5\uff0c\u6211\u4ece\u4ee3\u7801\u4e2d\u6458\u51fa\u6765\uff0c\u4e2d\u82f1\u6587\u5bf9\u7167\u7740\u770b\u4e0b\uff1a<\/p>\nstruct redisServer {\n \/* \u7701\u7565\u5176\u4ed6\u5b57\u6bb5 *\/ \n \/* RDB persistence *\/\n long long dirty; \/* Changes to DB from the last save\n * \u4e0a\u6b21\u6301\u4e45\u5316\u540e\u4fee\u6539key\u7684\u6b21\u6570 *\/\n struct saveparam *saveparams; \/* Save points array for RDB\uff0c\n * \u5bf9\u5e94\u914d\u7f6e\u6587\u4ef6\u591a\u4e2asave\u53c2\u6570 *\/\n int saveparamslen; \/* Number of saving points\uff0c\n * save\u53c2\u6570\u7684\u6570\u91cf *\/\n time_t lastsave; \/* Unix time of last successful save \n * \u4e0a\u6b21\u6301\u4e45\u5316\u65f6\u95f4*\/\n \/* \u7701\u7565\u5176\u4ed6\u5b57\u6bb5 *\/\n}\n\n\/* \u5bf9\u5e94redis.conf\u4e2d\u7684save\u53c2\u6570 *\/\nstruct saveparam {\n time_t seconds; \/* \u7edf\u8ba1\u65f6\u95f4\u8303\u56f4 *\/ \n int changes; \/* \u6570\u636e\u4fee\u6539\u6b21\u6570 *\/\n};<\/pre>\nsaveparams<\/code>\u5bf9\u5e94redis.conf<\/code>\u4e0b\u7684save\u89c4\u5219\uff0csave\u53c2\u6570\u662fRedis\u89e6\u53d1\u81ea\u52a8\u5907\u4efd\u7684\u89e6\u53d1\u7b56\u7565\uff0cseconds<\/code>\u4e3a\u7edf\u8ba1\u65f6\u95f4\uff08\u5355\u4f4d\uff1a\u79d2\uff09\uff0c changes<\/code>\u4e3a\u5728\u7edf\u8ba1\u65f6\u95f4\u5185\u53d1\u751f\u5199\u5165\u7684\u6b21\u6570\u3002save m n<\/code>\u7684\u610f\u601d\u662f\uff1am\u79d2\u5185\u6709n\u6761\u5199\u5165\u5c31\u89e6\u53d1\u4e00\u6b21\u5feb\u7167\uff0c\u5373\u5907\u4efd\u4e00\u6b21\u3002save\u53c2\u6570\u53ef\u4ee5\u914d\u7f6e\u591a\u7ec4\uff0c\u6ee1\u8db3\u5728\u4e0d\u540c\u6761\u4ef6\u7684\u5907\u4efd\u8981\u6c42\u3002\u5982\u679c\u9700\u8981\u5173\u95edRDB\u7684\u81ea\u52a8\u5907\u4efd\u7b56\u7565\uff0c\u53ef\u4ee5\u4f7f\u7528save \"\"<\/code>\u3002\u4ee5\u4e0b\u4e3a\u51e0\u79cd\u914d\u7f6e\u7684\u8bf4\u660e\uff1a<\/p>\n# \u8868\u793a900\u79d2\uff0815\u5206\u949f\uff09\u5185\u81f3\u5c11\u67091\u4e2akey\u7684\u503c\u53d1\u751f\u53d8\u5316\uff0c\u5219\u6267\u884c\nsave 900 1\n# \u8868\u793a300\u79d2\uff085\u5206\u949f\uff09\u5185\u81f3\u5c11\u67091\u4e2akey\u7684\u503c\u53d1\u751f\u53d8\u5316\uff0c\u5219\u6267\u884c\nsave 300 10\n# \u8868\u793a60\u79d2\uff081\u5206\u949f\uff09\u5185\u81f3\u5c11\u670910000\u4e2akey\u7684\u503c\u53d1\u751f\u53d8\u5316\uff0c\u5219\u6267\u884c\nsave 60 10000\n# \u8be5\u914d\u7f6e\u5c06\u4f1a\u5173\u95edRDB\u65b9\u5f0f\u7684\u6301\u4e45\u5316\nsave \"\"<\/pre>\n
serverCron<\/code>\u5bf9RDB save\u89c4\u5219\u7684\u68c0\u6d4b\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\nint serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {\n \/* \u7701\u7565\u5176\u4ed6\u903b\u8f91 *\/\n \n \/* \u5982\u679c\u7528\u6237\u8bf7\u6c42\u8fdb\u884cAOF\u6587\u4ef6\u91cd\u5199\u65f6\uff0cRedis\u6b63\u5728\u6267\u884cRDB\u6301\u4e45\u5316\uff0cRedis\u4f1a\u5b89\u6392\u5728RDB\u6301\u4e45\u5316\u5b8c\u6210\u540e\u6267\u884cAOF\u6587\u4ef6\u91cd\u5199\uff0c\n * \u5982\u679caof_rewrite_scheduled\u4e3atrue\uff0c\u8bf4\u660e\u9700\u8981\u6267\u884c\u7528\u6237\u7684\u8bf7\u6c42 *\/\n \/* Check if a background saving or AOF rewrite in progress terminated. *\/\n if (hasActiveChildProcess() || ldbPendingChildren())\n {\n run_with_period(1000) receiveChildInfo();\n checkChildrenDone();\n } else {\n \/* \u540e\u53f0\u65e0 saving\/rewrite \u5b50\u8fdb\u7a0b\u624d\u4f1a\u8fdb\u884c\uff0c\u9010\u4e2a\u68c0\u67e5\u6bcf\u4e2asave\u89c4\u5219*\/\n for (j = 0; j < server.saveparamslen; j++) {\n struct saveparam *sp = server.saveparams+j;\n \n \/* \u68c0\u67e5\u89c4\u5219\u6709\u51e0\u4e2a\uff1a\u6ee1\u8db3\u4fee\u6539\u6b21\u6570\uff0c\u6ee1\u8db3\u7edf\u8ba1\u5468\u671f\uff0c\u8fbe\u5230\u91cd\u8bd5\u65f6\u95f4\u95f4\u9694\u6216\u8005\u4e0a\u6b21\u6301\u4e45\u5316\u5b8c\u6210*\/\n if (server.dirty >= sp->changes \n && server.unixtime-server.lastsave > sp->seconds \n &&(server.unixtime-server.lastbgsave_try > CONFIG_BGSAVE_RETRY_DELAY || server.lastbgsave_status == C_OK))\n {\n serverLog(LL_NOTICE,\"%d changes in %d seconds. Saving...\", sp->changes, (int)sp->seconds);\n rdbSaveInfo rsi, *rsiptr;\n rsiptr = rdbPopulateSaveInfo(&rsi);\n \/* \u6267\u884cbgsave\u8fc7\u7a0b *\/\n rdbSaveBackground(server.rdb_filename,rsiptr);\n break;\n }\n }\n\n \/* \u7701\u7565\uff1aTrigger an AOF rewrite if needed. *\/\n }\n \/* \u7701\u7565\u5176\u4ed6\u903b\u8f91 *\/\n}<\/pre>\n\n
int rdbSaveBackground(char *filename, rdbSaveInfo *rsi) {\n pid_t childpid;\n\n if (hasActiveChildProcess()) return C_ERR;\n\n server.dirty_before_bgsave = server.dirty;\n server.lastbgsave_try = time(NULL);\n\n \/\/ fork\u5b50\u8fdb\u7a0b\n if ((childpid = redisFork(CHILD_TYPE_RDB)) == 0) {\n int retval;\n\n \/* Child \u5b50\u8fdb\u7a0b\uff1a\u4fee\u6539\u8fdb\u7a0b\u6807\u9898 *\/\n redisSetProcTitle(\"redis-rdb-bgsave\");\n redisSetCpuAffinity(server.bgsave_cpulist);\n \/\/ \u6267\u884crdb\u6301\u4e45\u5316\n retval = rdbSave(filename,rsi);\n if (retval == C_OK) {\n sendChildCOWInfo(CHILD_TYPE_RDB, 1, \"RDB\");\n }\n \/\/ \u6301\u4e45\u5316\u5b8c\u6210\u540e\uff0c\u9000\u51fa\u5b50\u8fdb\u7a0b\n exitFromChild((retval == C_OK) ? 0 : 1);\n } else {\n \/* Parent \u7236\u8fdb\u7a0b\uff1a\u8bb0\u5f55fork\u5b50\u8fdb\u7a0b\u7684\u65f6\u95f4\u7b49\u4fe1\u606f*\/\n if (childpid == -1) {\n server.lastbgsave_status = C_ERR;\n serverLog(LL_WARNING,\"Can't save in background: fork: %s\",\n strerror(errno));\n return C_ERR;\n }\n serverLog(LL_NOTICE,\"Background saving started by pid %ld\",(long) childpid);\n \/\/ \u8bb0\u5f55\u5b50\u8fdb\u7a0b\u5f00\u59cb\u7684\u65f6\u95f4\u3001\u7c7b\u578b\u7b49\u3002\n server.rdb_save_time_start = time(NULL);\n server.rdb_child_type = RDB_CHILD_TYPE_DISK;\n return C_OK;\n }\n return C_OK; \/* unreached *\/\n}<\/pre>\n![](\"https:\/\/www.17golang.com\/uploads\/20240418\/1713439649662103a156b76.jpg\")
\u8865\u5145\u8bf4\u660e\u4e00\u4e0b\uff0c\u4e0a\u56fe\u53f3\u4e0b\u89d2\u201c\u904d\u5386\u5f53\u524d\u6570\u636e\u5e93\u7684\u952e\u503c\u5bf9\u5e76\u5199\u5165\u201d\u8fd9\u4e2a\u73af\u8282\u4f1a\u6839\u636e\u4e0d\u540c\u7c7b\u578b\u7684Redis\u6570\u636e\u7c7b\u578b\u53ca\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u91c7\u7528\u4e0d\u540c\u7684\u683c\u5f0f\u5199\u5165\u5230RDB\u6587\u4ef6\u4e2d\uff0c\u4e0d\u518d\u5c55\u5f00\u4e86\u3002\u6211\u89c9\u5f97\u5927\u5bb6\u5bf9\u6574\u4e2a\u8fc7\u7a0b\u6709\u4e2a\u76f4\u89c2\u7684\u7406\u89e3\u5c31\u597d\uff0c\u8fd9\u5bf9\u4e8e\u6211\u4eec\u7406\u89e3Redis\u5185\u90e8\u7684\u8fd0\u4f5c\u673a\u5236\u5927\u6709\u88e8\u76ca\u3002<\/p>\nAOF\u6301\u4e45\u5316<\/h4>\n
AOF\u5de5\u4f5c\u539f\u7406<\/h4>\n
# no-\u5173\u95ed\uff0cyes-\u5f00\u542f\uff0c\u9ed8\u8ba4no\nappendonly yes\nappendfilename appendonly.aof<\/pre>\n
set number 0<\/code>\uff0c\u7136\u540e\u968f\u673a\u8c03\u7528incr number<\/code>\u3001get number<\/code> \u54045\u6b21\uff0c\u6700\u540e\u518d\u6267\u884c\u4e00\u6b21get number<\/code> \uff0c\u6211\u4eec\u5f97\u5230\u7684\u7ed3\u679c\u80af\u5b9a\u662f5\u3002<\/p>\nnumber<\/code>\u72b6\u6001\u53d8\u66f4\u7684\u53ea\u6709set\/incr<\/code>\u7c7b\u578b\u7684\u6307\u4ee4\uff0c\u5e76\u4e14\u5b83\u4eec\u6267\u884c\u7684\u5148\u540e\u987a\u5e8f\u662f\u5df2\u77e5\u7684\uff0c\u65e0\u8bba\u6267\u884c\u591a\u5c11\u6b21get<\/code>\u90fd\u4e0d\u4f1a\u5f71\u54cdnumber<\/code>\u7684\u72b6\u6001\u3002\u6240\u4ee5\uff0c\u4fdd\u7559\u6240\u6709set\/incr<\/code>\u547d\u4ee4\u5e76\u6301\u4e45\u5316\u81f3aof\u6587\u4ef6\u5373\u53ef\u3002\u6309\u7167aof\u7684\u8bbe\u8ba1\u539f\u7406\uff0caof\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\u5e94\u8be5\u662f\u8fd9\u6837\u7684\uff08\u8fd9\u91cc\u662f\u5047\u8bbe\uff0c\u5b9e\u9645\u4e3aRESP\u534f\u8bae\uff09\uff1a<\/p>\nset number 0\nincr number\nincr number\nincr number\nincr number\nincr number<\/pre>\n
\n
set<\/code>\u547d\u4ee4\uff0c\u5b58\u5728\u5f88\u5927\u7684\u538b\u7f29\u7a7a\u95f4\u3002<\/p>\n<\/li>\n\u6301\u4e45\u5316\u6d41\u7a0b<\/h4>\n
![](\"https:\/\/www.17golang.com\/uploads\/20240418\/1713439649662103a15af64.jpg\")
<\/p>\n\n
sds<\/code>\uff0cRedis\u4f1a\u6839\u636e\u547d\u4ee4\u7684\u7c7b\u578b\u91c7\u7528\u4e0d\u540c\u7684\u65b9\u6cd5\uff08catAppendOnlyGenericCommand<\/code>\u3001catAppendOnlyExpireAtCommand<\/code>\u7b49\uff09\u5bf9\u547d\u4ee4\u5185\u5bb9\u8fdb\u884c\u5904\u7406\uff0c\u6700\u540e\u5199\u5165\u7f13\u51b2\u533a\u3002<\/p>\naof_rewrite_buffer<\/code>\uff09\u3002<\/p>\n![](\"https:\/\/www.17golang.com\/uploads\/20240418\/1713439649662103a15ecfd.jpg\")
<\/p>\n\n
beforeSleep<\/code>\uff09\u90fd\u4f1a\u8c03\u7528\u51fd\u6570flushAppendOnlyFile<\/code>\uff0cflushAppendOnlyFile<\/code>\u4f1a\u628aAOF\u7f13\u51b2\u533a\uff08aof_buf<\/code>\uff09\u4e2d\u7684\u6570\u636e\u5199\u5165\u5185\u6838\u7f13\u51b2\u533a\uff0c\u5e76\u4e14\u6839\u636eappendfsync<\/code>\u914d\u7f6e\u6765\u51b3\u5b9a\u91c7\u7528\u4f55\u79cd\u7b56\u7565\u628a\u5185\u6838\u7f13\u51b2\u533a\u4e2d\u7684\u6570\u636e\u5199\u5165\u78c1\u76d8\uff0c\u5373\u8c03\u7528fsync()<\/code>\u3002\u8be5\u914d\u7f6e\u6709\u4e09\u4e2a\u53ef\u9009\u9879always<\/code>\u3001no<\/code>\u3001everysec<\/code>\uff0c\u5177\u4f53\u8bf4\u660e\u5982\u4e0b\uff1a<\/p>\n\n
fsync()<\/code>\uff0c\u662f\u5b89\u5168\u6027\u6700\u9ad8\u3001\u6027\u80fd\u6700\u5dee\u7684\u4e00\u79cd\u7b56\u7565\u3002<\/p>\n<\/li>\nfsync()<\/code>\u3002\u6027\u80fd\u6700\u597d\uff0c\u5b89\u5168\u6027\u6700\u5dee\u3002<\/p>\n<\/li>\nfsync()<\/code>\u3002\u8fd9\u662f\u5b98\u65b9\u5efa\u8bae\u7684\u540c\u6b65\u7b56\u7565\uff0c\u4e5f\u662f\u9ed8\u8ba4\u914d\u7f6e\uff0c\u505a\u5230\u517c\u987e\u6027\u80fd\u548c\u6570\u636e\u5b89\u5168\u6027\uff0c\u7406\u8bba\u4e0a\u53ea\u6709\u5728\u7cfb\u7edf\u7a81\u7136\u5b95\u673a\u7684\u60c5\u51b5\u4e0b\u4e22\u59311\u79d2\u7684\u6570\u636e\u3002<\/p>\n<\/li>\n<\/ul>\nno-appendfsync-on-rewrite<\/code>\u7684\u5f71\u54cd\uff0c\u5b83\u7684\u4f5c\u7528\u662f\u544a\u77e5Redis\uff1aAOF\u6587\u4ef6\u91cd\u5199\u671f\u95f4\u662f\u5426\u7981\u6b62\u8c03\u7528fsync()\uff0c\u9ed8\u8ba4\u662fno\u3002<\/strong><\/p>\nappendfsync<\/code>\u8bbe\u7f6e\u4e3aalways<\/code>\u6216everysec<\/code>\uff0c\u540e\u53f0\u6b63\u5728\u8fdb\u884c\u7684BGSAVE<\/code>\u6216\u8005BGREWRITEAOF<\/code>\u6d88\u8017\u8fc7\u591a\u7684\u78c1\u76d8I\/O\uff0c\u5728\u67d0\u4e9bLinux\u7cfb\u7edf\u914d\u7f6e\u4e0b\uff0cRedis\u5bf9fsync()\u7684\u8c03\u7528\u53ef\u80fd\u963b\u585e\u5f88\u957f\u65f6\u95f4\u3002\u7136\u800c\u8fd9\u4e2a\u95ee\u9898\u8fd8\u6ca1\u6709\u4fee\u590d\uff0c\u56e0\u4e3a\u5373\u4f7f\u662f\u5728\u4e0d\u540c\u7684\u7ebf\u7a0b\u4e2d\u6267\u884cfsync()<\/code>\uff0c\u540c\u6b65\u5199\u5165\u64cd\u4f5c\u4e5f\u4f1a\u88ab\u963b\u585e\u3002<\/p>\nBGSAVE<\/code>\u6216BGREWRITEAOF<\/code>\u65f6\u5728\u4e3b\u8fdb\u7a0b\u4e2d\u8c03\u7528fsync(\uff09\u3002<\/p>\n\n
yes<\/code>\u610f\u5473\u7740\uff0c\u5982\u679c\u5b50\u8fdb\u7a0b\u6b63\u5728\u8fdb\u884cBGSAVE<\/code>\u6216BGREWRITEAOF<\/code>\uff0cAOF\u7684\u6301\u4e45\u5316\u80fd\u529b\u5c31\u4e0eappendfsync<\/code>\u8bbe\u7f6e\u4e3ano<\/code>\u6709\u7740\u76f8\u540c\u7684\u6548\u679c\u3002\u6700\u7cdf\u7cd5\u7684\u60c5\u51b5\u4e0b\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f430\u79d2\u7684\u7f13\u5b58\u6570\u636e\u4e22\u5931\u3002<\/p>\n<\/li>\nyes<\/code>\uff0c\u5426\u5219\u4fdd\u6301\u4e3ano<\/code>\u3002<\/p>\n<\/li>\n<\/ul>\n![](\"https:\/\/www.17golang.com\/uploads\/20240418\/1713439649662103a1602e5.jpg\")
\u6211\u4eec\u8bf4\uff0cAOF\u6587\u4ef6\u592a\u5927\u65f6\u4f1a\u89e6\u53d1AOF\u6587\u4ef6\u91cd\u5199\uff0c\u90a3\u5230\u5e95\u662f\u591a\u5927\u5462\uff1f\u6709\u54ea\u4e9b\u60c5\u51b5\u4f1a\u89e6\u53d1\u91cd\u5199\u64cd\u4f5c\u5462\uff1f<\/strong> ** \u4e0eRDB\u65b9\u5f0f\u4e00\u6837\uff0cAOF\u6587\u4ef6\u91cd\u5199\u65e2\u53ef\u4ee5\u624b\u52a8\u89e6\u53d1\uff0c\u4e5f\u4f1a\u81ea\u52a8\u89e6\u53d1\u3002\u624b\u52a8\u89e6\u53d1\u76f4\u63a5\u8c03\u7528bgrewriteaof<\/code>\u547d\u4ee4\uff0c\u5982\u679c\u5f53\u65f6\u65e0\u5b50\u8fdb\u7a0b\u6267\u884c\u4f1a\u7acb\u523b\u6267\u884c\uff0c\u5426\u5219\u5b89\u6392\u5728\u5b50\u8fdb\u7a0b\u7ed3\u675f\u540e\u6267\u884c\u3002\u81ea\u52a8\u89e6\u53d1\u7531Redis\u7684\u5468\u671f\u6027\u65b9\u6cd5serverCron<\/code>\u68c0\u67e5\u5728\u6ee1\u8db3\u4e00\u5b9a\u6761\u4ef6\u65f6\u89e6\u53d1\u3002\u5148\u4e86\u89e3\u4e24\u4e2a\u914d\u7f6e\u9879\uff1a<\/p>\n\n
BGREWRITEAOF<\/code>\u65f6AOF\u6587\u4ef6\u5360\u7528\u7a7a\u95f4\u6700\u5c0f\u503c\uff0c\u9ed8\u8ba4\u4e3a64MB\uff1b<\/p>\n<\/li>\n<\/ul>\naof_base_size<\/code>\u521d\u59cb\u5316\u4e3a\u5f53\u65f6aof\u6587\u4ef6\u7684\u5927\u5c0f\uff0cRedis\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u5f53AOF\u6587\u4ef6\u91cd\u5199\u64cd\u4f5c\u5b8c\u6210\u65f6\uff0c\u4f1a\u5bf9\u5176\u8fdb\u884c\u66f4\u65b0\uff1baof_current_size<\/code>\u4e3aserverCron<\/code>\u6267\u884c\u65f6AOF\u6587\u4ef6\u7684\u5b9e\u65f6\u5927\u5c0f\u3002\u5f53\u6ee1\u8db3\u4ee5\u4e0b\u4e24\u4e2a\u6761\u4ef6\u65f6\uff0cAOF\u6587\u4ef6\u91cd\u5199\u5c31\u4f1a\u89e6\u53d1\uff1a<\/p>\n\u589e\u957f\u6bd4\u4f8b\uff1a(aof_current_size - aof_base_size) \/ aof_base_size > auto-aof-rewrite-percentage\n\u6587\u4ef6\u5927\u5c0f\uff1aaof_current_size > auto-aof-rewrite-min-size<\/pre>\n
serverCron<\/code>\u4e2d\uff1a<\/p>\nint serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {\n \/* \u7701\u7565\u5176\u4ed6\u903b\u8f91 *\/\n \n \/* \u5982\u679c\u7528\u6237\u8bf7\u6c42\u8fdb\u884cAOF\u6587\u4ef6\u91cd\u5199\u65f6\uff0cRedis\u6b63\u5728\u6267\u884cRDB\u6301\u4e45\u5316\uff0cRedis\u4f1a\u5b89\u6392\u5728RDB\u6301\u4e45\u5316\u5b8c\u6210\u540e\u6267\u884cAOF\u6587\u4ef6\u91cd\u5199\uff0c\n * \u5982\u679caof_rewrite_scheduled\u4e3atrue\uff0c\u8bf4\u660e\u9700\u8981\u6267\u884c\u7528\u6237\u7684\u8bf7\u6c42 *\/\n if (!hasActiveChildProcess() &&\n server.aof_rewrite_scheduled)\n {\n rewriteAppendOnlyFileBackground();\n }\n\n \/* Check if a background saving or AOF rewrite in progress terminated. *\/\n if (hasActiveChildProcess() || ldbPendingChildren())\n {\n run_with_period(1000) receiveChildInfo();\n checkChildrenDone();\n } else {\n \/* \u7701\u7565rdb\u6301\u4e45\u5316\u6761\u4ef6\u68c0\u67e5 *\/\n\n \/* AOF\u91cd\u5199\u6761\u4ef6\u68c0\u67e5\uff1aaof\u5f00\u542f\u3001\u65e0\u5b50\u8fdb\u7a0b\u8fd0\u884c\u3001\u589e\u957f\u767e\u5206\u6bd4\u5df2\u8bbe\u7f6e\u3001\u5f53\u524d\u6587\u4ef6\u5927\u5c0f\u8d85\u8fc7\u9608\u503c *\/\n if (server.aof_state == AOF_ON &&\n !hasActiveChildProcess() &&\n server.aof_rewrite_perc &&\n server.aof_current_size > server.aof_rewrite_min_size)\n {\n long long base = server.aof_rewrite_base_size ?\n server.aof_rewrite_base_size : 1;\n \/* \u8ba1\u7b97\u589e\u957f\u767e\u5206\u6bd4 *\/\n long long growth = (server.aof_current_size*100\/base) - 100;\n if (growth >= server.aof_rewrite_perc) {\n serverLog(LL_NOTICE,\"Starting automatic rewriting of AOF on %lld%% growth\",growth);\n rewriteAppendOnlyFileBackground();\n }\n }\n }\n \/**\/\n}<\/pre>\naof-use-rdb-preamble<\/code>\uff08\u4f7f\u7528RDB\u4f5c\u4e3aAOF\u6587\u4ef6\u7684\u524d\u534a\u6bb5\uff09\u63a7\u5236\uff0c\u9ed8\u8ba4\u5173\u95ed(no)\uff0c\u8bbe\u7f6e\u4e3ayes\u53ef\u5f00\u542f\u3002\u6240\u4ee5\uff0c\u5728AOF\u91cd\u5199\u8fc7\u7a0b\u4e2d\u6587\u4ef6\u7684\u5199\u5165\u4f1a\u6709\u4e24\u79cd\u4e0d\u540c\u7684\u65b9\u5f0f\u3002\u5f53aof-use-rdb-preamble<\/code>\u7684\u503c\u662f\uff1a<\/p>\n\n
aof.c<\/code>\uff09\u53ca\u53c2\u8003\u8d44\u6599\uff0c\u7ed8\u5236AOF\u91cd\u5199\uff08BGREWRITEAOF\uff09\u6d41\u7a0b\u56fe\uff1a ![](\"https:\/\/www.17golang.com\/uploads\/20240418\/1713439649662103a163970.jpg\")
\u7ed3\u5408\u4e0a\u56fe\uff0c\u603b\u7ed3\u4e00\u4e0bAOF\u6587\u4ef6\u91cd\u5199\u7684\u6d41\u7a0b\uff1a<\/p>\n\n
\n
\n
aof-use-rdb-preamble<\/code>\u914d\u7f6e\uff0c\u4ee5RDB\u6216AOF\u65b9\u5f0f\u5199\u5165\u524d\u534a\u90e8\u5206\uff0c\u5e76\u540c\u6b65\u81f3\u786c\u76d8\uff1b<\/p>\n<\/li>\n\u6570\u636e\u52a0\u8f7d<\/h3>\n
loadDataFromDisk<\/code>\u51fd\u6570\u6267\u884c\u6570\u636e\u52a0\u8f7d\u5de5\u4f5c\u3002\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\uff0c\u867d\u7136\u6301\u4e45\u5316\u65b9\u5f0f\u53ef\u4ee5\u9009\u62e9AOF\u3001RDB\u6216\u8005\u4e24\u8005\u517c\u7528\uff0c\u4f46\u662f\u6570\u636e\u52a0\u8f7d\u65f6\u5fc5\u987b\u505a\u51fa\u9009\u62e9\uff0c\u4e24\u79cd\u65b9\u5f0f\u5404\u81ea\u52a0\u8f7d\u4e00\u904d\u5c31\u4e71\u5957\u4e86\u3002<\/p>\n![](\"https:\/\/www.17golang.com\/uploads\/20240418\/1713439649662103a1657c4.jpg\")
\u5728AOF\u65b9\u5f0f\u4e0b\uff0c\u5f00\u542f\u6df7\u5408\u6301\u4e45\u5316\u673a\u5236\u751f\u6210\u7684\u6587\u4ef6\u662f\u201cRDB\u5934+AOF\u5c3e\u201d\uff0c\u672a\u5f00\u542f\u65f6\u751f\u6210\u7684\u6587\u4ef6\u5168\u90e8\u4e3aAOF\u683c\u5f0f\u3002\u8003\u8651\u4e24\u79cd\u6587\u4ef6\u683c\u5f0f\u7684\u517c\u5bb9\u6027\uff0c\u5982\u679cRedis\u53d1\u73b0AOF\u6587\u4ef6\u4e3aRDB\u5934\uff0c\u4f1a\u4f7f\u7528RDB\u6570\u636e\u52a0\u8f7d\u7684\u65b9\u6cd5\u8bfb\u53d6\u5e76\u6062\u590d\u524d\u534a\u90e8\u5206\uff1b\u7136\u540e\u518d\u4f7f\u7528AOF\u65b9\u5f0f\u8bfb\u53d6\u5e76\u6062\u590d\u540e\u534a\u90e8\u5206\u3002\u7531\u4e8eAOF\u683c\u5f0f\u5b58\u50a8\u7684\u6570\u636e\u4e3aRESP\u534f\u8bae\u547d\u4ee4\uff0cRedis\u91c7\u7528\u4f2a\u5ba2\u6237\u7aef\u6267\u884c\u547d\u4ee4\u7684\u65b9\u5f0f\u6765\u6062\u590d\u6570\u636e\u3002<\/p>\naof-load-truncated<\/code>\u6267\u884c\u4e0d\u540c\u7684\u5904\u7406\u7b56\u7565\u3002\u8fd9\u4e2a\u914d\u7f6e\u662f\u544a\u8bc9Redis\u542f\u52a8\u65f6\u8bfb\u53d6aof\u6587\u4ef6\uff0c\u5982\u679c\u53d1\u73b0\u6587\u4ef6\u88ab\u622a\u65ad\uff08\u4e0d\u5b8c\u6574\uff09\u65f6\u8be5\u5982\u4f55\u5904\u7406\uff1a<\/p>\n\n
\u603b\u7ed3<\/h3>\n
RDB vs AOF<\/strong><\/h4>\n
\n
\n
\n
redis-check-aof<\/code>\u5de5\u5177\u4fee\u590d\uff1b<\/p>\n<\/li>\n\n
\u4f7f\u7528\u5efa\u8bae<\/strong><\/h4>\n
\n
\u5173\u4e8efork()<\/strong><\/h4>\n
\n