“`\u8003\u5bdf\u70b9\uff1aredis<\/p>\n
\u00a0<\/p>\n
RDB \u6301\u4e45\u5316\u53ef\u4ee5\u5728\u6307\u5b9a\u7684\u65f6\u95f4\u95f4\u9694\u5185\u751f\u6210\u6570\u636e\u96c6\u7684\u65f6\u95f4\u70b9\u5feb\u7167\uff08point-in-time snapshot\uff09\u3002<\/p>\n
AOF \u6301\u4e45\u5316\u8bb0\u5f55\u670d\u52a1\u5668\u6267\u884c\u7684\u6240\u6709\u5199\u64cd\u4f5c\u547d\u4ee4\uff0c\u5e76\u5728\u670d\u52a1\u5668\u542f\u52a8\u65f6\uff0c\u901a\u8fc7\u91cd\u65b0\u6267\u884c\u8fd9\u4e9b\u547d\u4ee4\u6765\u8fd8\u539f\u6570\u636e\u96c6\u3002 AOF \u6587\u4ef6\u4e2d\u7684\u547d\u4ee4\u5168\u90e8\u4ee5 Redis \u534f\u8bae\u7684\u683c\u5f0f\u6765\u4fdd\u5b58\uff0c\u65b0\u547d\u4ee4\u4f1a\u88ab\u8ffd\u52a0\u5230\u6587\u4ef6\u7684\u672b\u5c3e\u3002 Redis \u8fd8\u53ef\u4ee5\u5728\u540e\u53f0\u5bf9 AOF \u6587\u4ef6\u8fdb\u884c\u91cd\u5199\uff08rewrite\uff09\uff0c\u4f7f\u5f97 AOF \u6587\u4ef6\u7684\u4f53\u79ef\u4e0d\u4f1a\u8d85\u51fa\u4fdd\u5b58\u6570\u636e\u96c6\u72b6\u6001\u6240\u9700\u7684\u5b9e\u9645\u5927\u5c0f\u3002Redis \u8fd8\u53ef\u4ee5\u540c\u65f6\u4f7f\u7528 AOF \u6301\u4e45\u5316\u548c RDB \u6301\u4e45\u5316\u3002 \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c \u5f53 Redis \u91cd\u542f\u65f6\uff0c \u5b83\u4f1a\u4f18\u5148\u4f7f\u7528 AOF \u6587\u4ef6\u6765\u8fd8\u539f\u6570\u636e\u96c6\uff0c \u56e0\u4e3a AOF \u6587\u4ef6\u4fdd\u5b58\u7684\u6570\u636e\u96c6\u901a\u5e38\u6bd4 RDB \u6587\u4ef6\u6240\u4fdd\u5b58\u7684\u6570\u636e\u96c6\u66f4\u5b8c\u6574\u3002\u4f60\u751a\u81f3\u53ef\u4ee5\u5173\u95ed\u6301\u4e45\u5316\u529f\u80fd\uff0c\u8ba9\u6570\u636e\u53ea\u5728\u670d\u52a1\u5668\u8fd0\u884c\u65f6\u5b58\u5728\u3002<\/p>\n
RDB \u7684\u4f18\u70b9:<\/p>\n
RDB \u662f\u4e00\u4e2a\u975e\u5e38\u7d27\u51d1\uff08compact\uff09\u7684\u6587\u4ef6\uff0c\u5b83\u4fdd\u5b58\u4e86 Redis \u5728\u67d0\u4e2a\u65f6\u95f4\u70b9\u4e0a\u7684\u6570\u636e\u96c6\u3002 \u8fd9\u79cd\u6587\u4ef6\u975e\u5e38\u9002\u5408\u7528\u4e8e\u8fdb\u884c\u5907\u4efd\uff1a \u6bd4\u5982\u8bf4\uff0c\u4f60\u53ef\u4ee5\u5728\u6700\u8fd1\u7684 24 \u5c0f\u65f6\u5185\uff0c\u6bcf\u5c0f\u65f6\u5907\u4efd\u4e00\u6b21 RDB \u6587\u4ef6\uff0c\u5e76\u4e14\u5728\u6bcf\u4e2a\u6708\u7684\u6bcf\u4e00\u5929\uff0c\u4e5f\u5907\u4efd\u4e00\u4e2a RDB \u6587\u4ef6\u3002 \u8fd9\u6837\u7684\u8bdd\uff0c\u5373\u4f7f\u9047\u4e0a\u95ee\u9898\uff0c\u4e5f\u53ef\u4ee5\u968f\u65f6\u5c06\u6570\u636e\u96c6\u8fd8\u539f\u5230\u4e0d\u540c\u7684\u7248\u672c\u3002RDB \u975e\u5e38\u9002\u7528\u4e8e\u707e\u96be\u6062\u590d\uff08disaster recovery\uff09\uff1a\u5b83\u53ea\u6709\u4e00\u4e2a\u6587\u4ef6\uff0c\u5e76\u4e14\u5185\u5bb9\u90fd\u975e\u5e38\u7d27\u51d1\uff0c\u53ef\u4ee5\uff08\u5728\u52a0\u5bc6\u540e\uff09\u5c06\u5b83\u4f20\u9001\u5230\u522b\u7684\u6570\u636e\u4e2d\u5fc3\uff0c\u6216\u8005\u4e9a\u9a6c\u900a S3 \u4e2d\u3002RDB \u53ef\u4ee5\u6700\u5927\u5316 Redis \u7684\u6027\u80fd\uff1a\u7236\u8fdb\u7a0b\u5728\u4fdd\u5b58 RDB \u6587\u4ef6\u65f6\u552f\u4e00\u8981\u505a\u7684\u5c31\u662f fork \u51fa\u4e00\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u7136\u540e\u8fd9\u4e2a\u5b50\u8fdb\u7a0b\u5c31\u4f1a\u5904\u7406\u63a5\u4e0b\u6765\u7684\u6240\u6709\u4fdd\u5b58\u5de5\u4f5c\uff0c\u7236\u8fdb\u7a0b\u65e0\u987b\u6267\u884c\u4efb\u4f55\u78c1\u76d8 I\/O \u64cd\u4f5c\u3002RDB \u5728\u6062\u590d\u5927\u6570\u636e\u96c6\u65f6\u7684\u901f\u5ea6\u6bd4 AOF \u7684\u6062\u590d\u901f\u5ea6\u8981\u5feb\u3002<\/p>\n
RDB \u7684\u7f3a\u70b9:<\/p>\n
\u5982\u679c\u4f60\u9700\u8981\u5c3d\u91cf\u907f\u514d\u5728\u670d\u52a1\u5668\u6545\u969c\u65f6\u4e22\u5931\u6570\u636e\uff0c\u90a3\u4e48 RDB \u4e0d\u9002\u5408\u4f60\u3002 \u867d\u7136 Redis \u5141\u8bb8\u4f60\u8bbe\u7f6e\u4e0d\u540c\u7684\u4fdd\u5b58\u70b9\uff08save point\uff09\u6765\u63a7\u5236\u4fdd\u5b58 RDB \u6587\u4ef6\u7684\u9891\u7387\uff0c \u4f46\u662f\uff0c \u56e0\u4e3aRDB \u6587\u4ef6\u9700\u8981\u4fdd\u5b58\u6574\u4e2a\u6570\u636e\u96c6\u7684\u72b6\u6001\uff0c \u6240\u4ee5\u5b83\u5e76\u4e0d\u662f\u4e00\u4e2a\u8f7b\u677e\u7684\u64cd\u4f5c\u3002 \u56e0\u6b64\u4f60\u53ef\u80fd\u4f1a\u81f3\u5c11 5 \u5206\u949f\u624d\u4fdd\u5b58\u4e00\u6b21 RDB \u6587\u4ef6\u3002 \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c \u4e00\u65e6\u53d1\u751f\u6545\u969c\u505c\u673a\uff0c \u4f60\u5c31\u53ef\u80fd\u4f1a\u4e22\u5931\u597d\u51e0\u5206\u949f\u7684\u6570\u636e\u3002\u6bcf\u6b21\u4fdd\u5b58RDB \u7684\u65f6\u5019\uff0cRedis \u90fd\u8981 fork() \u51fa\u4e00\u4e2a\u5b50\u8fdb\u7a0b\uff0c\u5e76\u7531\u5b50\u8fdb\u7a0b\u6765\u8fdb\u884c\u5b9e\u9645\u7684\u6301\u4e45\u5316\u5de5\u4f5c\u3002 \u5728\u6570\u636e\u96c6\u6bd4\u8f83\u5e9e\u5927\u65f6\uff0c fork() \u53ef\u80fd\u4f1a\u975e\u5e38\u8017\u65f6\uff0c\u9020\u6210\u670d\u52a1\u5668\u5728\u67d0\u67d0\u6beb\u79d2\u5185\u505c\u6b62\u5904\u7406\u5ba2\u6237\u7aef\uff1b \u5982\u679c\u6570\u636e\u96c6\u975e\u5e38\u5de8\u5927\uff0c\u5e76\u4e14 CPU \u65f6\u95f4\u975e\u5e38\u7d27\u5f20\u7684\u8bdd\uff0c\u90a3\u4e48\u8fd9\u79cd\u505c\u6b62\u65f6\u95f4\u751a\u81f3\u53ef\u80fd\u4f1a\u957f\u8fbe\u6574\u6574\u4e00\u79d2\u3002 \u867d\u7136 AOF \u91cd\u5199\u4e5f\u9700\u8981\u8fdb\u884c fork() \uff0c\u4f46\u65e0\u8bba AOF \u91cd\u5199\u7684\u6267\u884c\u95f4\u9694\u6709\u591a\u957f\uff0c\u6570\u636e\u7684\u8010\u4e45\u6027\u90fd\u4e0d\u4f1a\u6709\u4efb\u4f55\u635f\u5931\u3002<\/p>\n
AOF \u7684\u4f18\u70b9:<\/p>\n
\u4f7f\u7528 AOF \u6301\u4e45\u5316\u4f1a\u8ba9 Redis \u53d8\u5f97\u975e\u5e38\u8010\u4e45\uff08much more durable\uff09\uff1a\u4f60\u53ef\u4ee5\u8bbe\u7f6e\u4e0d\u540c\u7684 fsync \u7b56\u7565\uff0c\u6bd4\u5982\u65e0 fsync \uff0c\u6bcf\u79d2\u949f\u4e00\u6b21 fsync \uff0c\u6216\u8005\u6bcf\u6b21\u6267\u884c\u5199\u5165\u547d\u4ee4\u65f6 fsync \u3002 AOF \u7684\u9ed8\u8ba4\u7b56\u7565\u4e3a\u6bcf\u79d2\u949f fsync \u4e00\u6b21\uff0c\u5728\u8fd9\u79cd\u914d\u7f6e\u4e0b\uff0cRedis \u4ecd\u7136\u53ef\u4ee5\u4fdd\u6301\u826f\u597d\u7684\u6027\u80fd\uff0c\u5e76\u4e14\u5c31\u7b97\u53d1\u751f\u6545\u969c\u505c\u673a\uff0c\u4e5f\u6700\u591a\u53ea\u4f1a\u4e22\u5931\u4e00\u79d2\u949f\u7684\u6570\u636e\uff08 fsync \u4f1a\u5728\u540e\u53f0\u7ebf\u7a0b\u6267\u884c\uff0c\u6240\u4ee5\u4e3b\u7ebf\u7a0b\u53ef\u4ee5\u7ee7\u7eed\u52aa\u529b\u5730\u5904\u7406\u547d\u4ee4\u8bf7\u6c42\uff09\u3002AOF \u6587\u4ef6\u662f\u4e00\u4e2a\u53ea\u8fdb\u884c\u8ffd\u52a0\u64cd\u4f5c\u7684\u65e5\u5fd7\u6587\u4ef6\uff08append only log\uff09\uff0c \u56e0\u6b64\u5bf9 AOF \u6587\u4ef6\u7684\u5199\u5165\u4e0d\u9700\u8981\u8fdb\u884cseek \uff0c \u5373\u4f7f\u65e5\u5fd7\u56e0\u4e3a\u67d0\u4e9b\u539f\u56e0\u800c\u5305\u542b\u4e86\u672a\u5199\u5165\u5b8c\u6574\u7684\u547d\u4ee4\uff08\u6bd4\u5982\u5199\u5165\u65f6\u78c1\u76d8\u5df2\u6ee1\uff0c\u5199\u5165\u4e2d\u9014\u505c\u673a\uff0c\u7b49\u7b49\uff09\uff0c redis-check-aof \u5de5\u5177\u4e5f\u53ef\u4ee5\u8f7b\u6613\u5730\u4fee\u590d\u8fd9\u79cd\u95ee\u9898\u3002<\/p>\n
Redis \u53ef\u4ee5\u5728 AOF \u6587\u4ef6\u4f53\u79ef\u53d8\u5f97\u8fc7\u5927\u65f6\uff0c\u81ea\u52a8\u5730\u5728\u540e\u53f0\u5bf9 AOF \u8fdb\u884c\u91cd\u5199\uff1a \u91cd\u5199\u540e\u7684\u65b0 AOF \u6587\u4ef6\u5305\u542b\u4e86\u6062\u590d\u5f53\u524d\u6570\u636e\u96c6\u6240\u9700\u7684\u6700\u5c0f\u547d\u4ee4\u96c6\u5408\u3002 \u6574\u4e2a\u91cd\u5199\u64cd\u4f5c\u662f\u7edd\u5bf9\u5b89\u5168\u7684\uff0c\u56e0\u4e3a Redis \u5728\u521b\u5efa\u65b0 AOF \u6587\u4ef6\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u7ee7\u7eed\u5c06\u547d\u4ee4\u8ffd\u52a0\u5230\u73b0\u6709\u7684 AOF \u6587\u4ef6\u91cc\u9762\uff0c\u5373\u4f7f\u91cd\u5199\u8fc7\u7a0b\u4e2d\u53d1\u751f\u505c\u673a\uff0c\u73b0\u6709\u7684 AOF \u6587\u4ef6\u4e5f\u4e0d\u4f1a\u4e22\u5931\u3002 \u800c\u4e00\u65e6\u65b0 AOF \u6587\u4ef6\u521b\u5efa\u5b8c\u6bd5\uff0cRedis \u5c31\u4f1a\u4ece\u65e7 AOF \u6587\u4ef6\u5207\u6362\u5230\u65b0 AOF \u6587\u4ef6\uff0c\u5e76\u5f00\u59cb\u5bf9\u65b0 AOF \u6587\u4ef6\u8fdb\u884c\u8ffd\u52a0\u64cd\u4f5c\u3002AOF \u6587\u4ef6\u6709\u5e8f\u5730\u4fdd\u5b58\u4e86\u5bf9\u6570\u636e\u5e93\u6267\u884c\u7684\u6240\u6709\u5199\u5165\u64cd\u4f5c\uff0c \u8fd9\u4e9b\u5199\u5165\u64cd\u4f5c\u4ee5 Redis \u534f\u8bae\u7684\u683c\u5f0f\u4fdd\u5b58\uff0c \u56e0\u6b64 AOF \u6587\u4ef6\u7684\u5185\u5bb9\u975e\u5e38\u5bb9\u6613\u88ab\u4eba\u8bfb\u61c2\uff0c \u5bf9\u6587\u4ef6\u8fdb\u884c\u5206\u6790\uff08parse\uff09\u4e5f\u5f88\u8f7b\u677e\u3002 \u5bfc\u51fa\uff08export\uff09 AOF \u6587\u4ef6\u4e5f\u975e\u5e38\u7b80\u5355\uff1a \u4e3e\u4e2a\u4f8b\u5b50\uff0c \u5982\u679c\u4f60\u4e0d\u5c0f\u5fc3\u6267\u884c\u4e86 FLUSHALL \u547d\u4ee4\uff0c \u4f46\u53ea\u8981 AOF \u6587\u4ef6\u672a\u88ab\u91cd\u5199\uff0c \u90a3\u4e48\u53ea\u8981\u505c\u6b62\u670d\u52a1\u5668\uff0c \u79fb\u9664 AOF \u6587\u4ef6\u672b\u5c3e\u7684 FLUSHALL \u547d\u4ee4\uff0c \u5e76\u91cd\u542f Redis \uff0c \u5c31\u53ef\u4ee5\u5c06\u6570\u636e\u96c6\u6062\u590d\u5230 FLUSHALL \u6267\u884c\u4e4b\u524d\u7684\u72b6\u6001\u3002<\/p>\n
AOF \u7684\u7f3a\u70b9:<\/p>\n
\u5bf9\u4e8e\u76f8\u540c\u7684\u6570\u636e\u96c6\u6765\u8bf4\uff0cAOF \u6587\u4ef6\u7684\u4f53\u79ef\u901a\u5e38\u8981\u5927\u4e8e RDB \u6587\u4ef6\u7684\u4f53\u79ef\u3002\u6839\u636e\u6240\u4f7f\u7528\u7684 fsync \u7b56\u7565\uff0cAOF \u7684\u901f\u5ea6\u53ef\u80fd\u4f1a\u6162\u4e8eRDB \u3002 \u5728\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c \u6bcf\u79d2 fsync \u7684\u6027\u80fd\u4f9d\u7136\u975e\u5e38\u9ad8\uff0c \u800c\u5173\u95ed fsync \u53ef\u4ee5\u8ba9 AOF \u7684\u901f\u5ea6\u548c RDB \u4e00\u6837\u5feb\uff0c \u5373\u4f7f\u5728\u9ad8\u8d1f\u8377\u4e4b\u4e0b\u4e5f\u662f\u5982\u6b64\u3002 \u4e0d\u8fc7\u5728\u5904\u7406\u5de8\u5927\u7684\u5199\u5165\u8f7d\u5165\u65f6\uff0cRDB \u53ef\u4ee5\u63d0\u4f9b\u66f4\u6709\u4fdd\u8bc1\u7684\u6700\u5927\u5ef6\u8fdf\u65f6\u95f4\uff08latency\uff09\u3002AOF \u5728\u8fc7\u53bb\u66fe\u7ecf\u53d1\u751f\u8fc7\u8fd9\u6837\u7684 bug \uff1a \u56e0\u4e3a\u4e2a\u522b\u547d\u4ee4\u7684\u539f\u56e0\uff0c\u5bfc\u81f4 AOF \u6587\u4ef6\u5728\u91cd\u65b0\u8f7d\u5165\u65f6\uff0c\u65e0\u6cd5\u5c06\u6570\u636e\u96c6\u6062\u590d\u6210\u4fdd\u5b58\u65f6\u7684\u539f\u6837\u3002 \uff08\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u963b\u585e\u547d\u4ee4 BRPOPLPUSH \u5c31\u66fe\u7ecf\u5f15\u8d77\u8fc7\u8fd9\u6837\u7684 bug \u3002\uff09 \u6d4b\u8bd5\u5957\u4ef6\u91cc\u4e3a\u8fd9\u79cd\u60c5\u51b5\u6dfb\u52a0\u4e86\u6d4b\u8bd5\uff1a \u5b83\u4eec\u4f1a\u81ea\u52a8\u751f\u6210\u968f\u673a\u7684\u3001\u590d\u6742\u7684\u6570\u636e\u96c6\uff0c \u5e76\u901a\u8fc7\u91cd\u65b0\u8f7d\u5165\u8fd9\u4e9b\u6570\u636e\u6765\u786e\u4fdd\u4e00\u5207\u6b63\u5e38\u3002 \u867d\u7136\u8fd9\u79cd bug \u5728 AOF \u6587\u4ef6\u4e2d\u5e76\u4e0d\u5e38\u89c1\uff0c \u4f46\u662f\u5bf9\u6bd4\u6765\u8bf4\uff0c RDB \u51e0\u4e4e\u662f\u4e0d\u53ef\u80fd\u51fa\u73b0\u8fd9\u79cd bug \u7684\u3002<\/p>\n
“`<\/p>\n","protected":false},"excerpt":{"rendered":"
“`\u8003\u5bdf\u70b9\uff1aredis \u00a0 RDB \u6301\u4e45\u5316\u53ef\u4ee5\u5728\u6307\u5b9a\u7684\u65f6\u95f4\u95f4\u9694\u5185\u751f\u6210\u6570\u636e\u96c6\u7684\u65f6\u95f4\u70b9\u5feb\u7167\uff08point […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-38560","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/38560","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=38560"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/38560\/revisions"}],"predecessor-version":[{"id":38561,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/38560\/revisions\/38561"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=38560"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=38560"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=38560"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}