{"id":1938,"date":"2022-09-29T06:00:53","date_gmt":"2022-09-29T06:00:53","guid":{"rendered":"https:\/\/www.ipcpu.com\/?p=1938"},"modified":"2022-09-29T06:02:01","modified_gmt":"2022-09-29T06:02:01","slug":"redis-expire-key","status":"publish","type":"post","link":"https:\/\/c.ipcpu.com\/2022\/09\/redis-expire-key\/","title":{"rendered":"Redis\u8fc7\u671fKey\u3001\u5185\u5b58\u56de\u6536\u7684\u4e00\u4e9b\u7ec6\u8282"},"content":{"rendered":"

Redis\u53ef\u4ee5\u8bf4\u662f\u4e00\u4e2a\u5185\u5b58\u7ea7\u6570\u636e\u5e93\uff0c\u53d7\u9650\u4e8e\u7269\u7406\u5185\u5b58\u7684\u5927\u5c0f\uff0c\u6211\u4eec\u4f1a\u9650\u5236Redis\u5bf9\u5185\u5b58\u7684\u4f7f\u7528\uff0c\u8fd9\u5728Redis\u4e2d\u4e3b\u8981\u4f53\u73b0\u5728\u4ee5\u4e0b\u4e24\u4e2a\u65b9\u9762\uff1a<\/p>\n

\n

\u5220\u9664\u5df2\u7ecf\u8fc7\u671f\u7684Key
\n \u5185\u5b58\u4f7f\u7528\u8fbe\u5230maxmemory\u4e0a\u9650\u65f6\u89e6\u53d1\u5185\u5b58\u6ea2\u51fa\u63a7\u5236\u7b56\u7565<\/p>\n<\/blockquote>\n

\u4e00\u3001\u5220\u9664\u5df2\u7ecf\u8fc7\u671f\u7684Key<\/h2>\n

redis \u4f1a\u5c06\u6bcf\u4e2a\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684 key \u653e\u5165\u5230\u4e00\u4e2a\u72ec\u7acb\u7684\u5b57\u5178<\/strong>\u4e2d\uff0c\u4ee5\u540e\u4f1a\u5b9a\u65f6\u904d\u5386\u8fd9\u4e2a\u5b57\u5178\u6765\u5220\u9664\u5230\u671f\u7684 key\u3002\u9664\u4e86\u5b9a\u65f6\u904d\u5386\u4e4b\u5916\uff0c\u5b83\u8fd8\u4f1a\u4f7f\u7528\u60f0\u6027\u7b56\u7565\u6765\u5220\u9664\u8fc7\u671f\u7684 key\uff0c\u5b9a\u65f6\u5220\u9664\u662f\u96c6\u4e2d\u5904\u7406\uff0c\u60f0\u6027\u5220\u9664\u662f\u96f6\u6563\u5904\u7406\u3002<\/p>\n

\u60f0\u6027\u5220\u9664<\/h4>\n

\u6240\u8c13\u60f0\u6027\u7b56\u7565\u5c31\u662f\u5728\u5ba2\u6237\u7aef\u8bbf\u95ee\u8fd9\u4e2a key \u7684\u65f6\u5019\uff0credis \u5bf9 key \u7684\u8fc7\u671f\u65f6\u95f4\u8fdb\u884c\u68c0\u67e5\uff0c\u5982\u679c\u8fc7\u671f\u4e86\u5c31\u7acb\u5373\u5220\u9664\u3002\u8fd9\u79cd\u7b56\u7565\u662f\u51fa\u4e8e\u8282\u7701CPU\u6210\u672c\u8003\u8651\uff0c\u4e0d\u9700\u8981\u5355\u72ec\u7ef4\u62a4TTL\u94fe\u8868\u6765\u5904\u7406\u8fc7\u671f\u952e\u7684\u5220\u9664\u3002\u4f46\u662f\u5355\u72ec\u7528\u8fd9\u79cd\u65b9\u5f0f\u5b58\u5728\u5185\u5b58\u6cc4\u9732\u7684\u95ee\u9898\uff0c\u5f53\u8fc7\u671f\u952e\u4e00\u76f4\u6ca1\u6709\u8bbf\u95ee\u5c06\u65e0\u6cd5\u5f97\u5230\u53ca\u65f6\u5220\u9664\uff0c\u4ece\u800c\u5bfc\u81f4\u5185\u5b58\u4e0d\u80fd\u53ca\u65f6\u91ca\u653e\u3002\u6b63\u56e0\u4e3a\u5982\u6b64\uff0cRedis\u8fd8\u63d0\u4f9b\u53e6\u4e00\u79cd\u5b9a\u65f6\u4efb\u52a1\u5220\u9664\u673a\u5236\u4f5c\u4e3a\u60f0\u6027\u5220\u9664\u7684\u8865\u5145\u3002<\/p>\n

\u5b9a\u671f\u5220\u9664<\/h4>\n

Redis \u9ed8\u8ba4\u4f1a\u6bcf\u79d2\u8fdb\u884c\u5341\u6b21\u8fc7\u671f\u626b\u63cf\uff08\u901a\u8fc7\u914d\u7f6e\u53c2\u6570hz\u63a7\u5236\uff09\uff0c\u8fd9\u79cd\u626b\u63cf\u4e0d\u4f1a\u904d\u5386\u8fc7\u671f\u5b57\u5178\u4e2d\u6240\u6709\u7684 key\uff0c\u800c\u662f\u91c7\u7528\u4e86\u4e00\u79cd\u7b80\u5355\u7684\u8d2a\u5fc3\u7b56\u7565\u3002<\/p>\n

\n

1\u3001\u4ece\u8fc7\u671f\u5b57\u5178\u4e2d\u968f\u673a\u6311\u9009 20 \u4e2a key\uff1b
\n 2\u3001\u5220\u9664\u8fd9 20 \u4e2a key \u4e2d\u5df2\u7ecf\u8fc7\u671f\u7684 key\uff1b
\n 3\u3001\u5982\u679c\u8fc7\u671f\u7684 key \u6bd4\u7387\u8d85\u8fc7 1\/4\uff0c\u90a3\u5c31\u91cd\u590d\u6b65\u9aa4 1\uff1b<\/p>\n<\/blockquote>\n

\"\u5185\u5b58\u8fc7\u671f\u7b56\u7565-\u6267\u884c\u6d41\u7a0b2.png\"
\n\u540c\u65f6\uff0c\u4e3a\u4e86\u4fdd\u8bc1\u8fc7\u671f\u626b\u63cf\u4e0d\u4f1a\u51fa\u73b0\u5faa\u73af\u8fc7\u5ea6\uff0c\u5bfc\u81f4\u7ebf\u7a0b\u5361\u6b7b\u73b0\u8c61\uff0c\u7b97\u6cd5\u8fd8\u589e\u52a0\u4e86\u626b\u63cf\u65f6\u95f4\u7684\u4e0a\u9650\uff0c\u9ed8\u8ba4\u4e0d\u4f1a\u8d85\u8fc7 25ms\u3002\u5982\u679c\u9700\u8981\u5220\u9664\u7684Key\u6570\u91cf\u5f88\u591a\uff0c\u6267\u884c\u65f6\u95f4\u8d85\u8fc725ms\u548b\u529e\uff1f Redis\u4f1a\u91c7\u7528\u5feb\u6a21\u5f0f\u8fd0\u884c\uff0c\u5feb\u6a21\u5f0f\u5220\u9664\u903b\u8f91\u4e0e\u6162\u6a21\u5f0f\u76f8\u540c\uff0c\u53ea\u662f\u6267\u884c\u7684\u8d85\u65f6\u65f6\u95f4\u4e0d\u540c\u3002\u5feb\u6a21\u5f0f\u8d85\u65f6\u65f6\u95f4\u4e3a1\u6beb\u79d2\u4e142\u79d2\u5185\u53ea\u80fd\u8fd0\u884c1\u6b21\u3002\u8bbe\u7f6e\u5feb\u6a21\u5f0f\u7684\u76ee\u7684\u4e5f\u662f\u4e3a\u4e86\u5c3d\u5feb\u5c06\u8fc7\u671fKey\u6e05\u7406\u3002(\u9ed8\u8ba4\u4f1a\u4ee5\u6162\u6a21\u5f0f\u8fd0\u884c\uff0c\u82e5\u662f\u8fd0\u884c\u65f6\u95f4\u8d85\u8fc725ms\u624d\u4f1a\u542f\u52a8\u5feb\u6a21\u5f0f\u8fd0\u884c)<\/p>\n

\u8bbe\u60f3\u4e00\u4e2a\u5927\u578b\u7684 Redis \u5b9e\u4f8b\u4e2d\u6240\u6709\u7684 key \u5728\u540c\u4e00\u65f6\u95f4\u8fc7\u671f\u4e86\uff0c\u4f1a\u51fa\u73b0\u600e\u6837\u7684\u7ed3\u679c\uff1f
\n\u6beb\u65e0\u7591\u95ee\uff0cRedis \u4f1a\u6301\u7eed\u626b\u63cf\u8fc7\u671f\u5b57\u5178 (\u5faa\u73af\u591a\u6b21)\uff0c\u76f4\u5230\u8fc7\u671f\u5b57\u5178\u4e2d\u8fc7\u671f\u7684 key \u53d8\u5f97\u7a00\u758f\uff0c\u624d\u4f1a\u505c\u6b62 (\u5faa\u73af\u6b21\u6570\u660e\u663e\u4e0b\u964d)\u3002\u8fd9\u5c31\u4f1a\u5bfc\u81f4\u7ebf\u4e0a\u8bfb\u5199\u8bf7\u6c42\u51fa\u73b0\u660e\u663e\u7684\u5361\u987f\u73b0\u8c61\u3002\u5bfc\u81f4\u8fd9\u79cd\u5361\u987f\u7684\u53e6\u5916\u4e00\u79cd\u539f\u56e0\u662f\u5185\u5b58\u7ba1\u7406\u5668\u9700\u8981\u9891\u7e41\u56de\u6536\u5185\u5b58\u9875\uff0c\u8fd9\u4e5f\u4f1a\u4ea7\u751f\u4e00\u5b9a\u7684 CPU \u6d88\u8017\u3002\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u5728\u8bbe\u7f6eKey\u7684\u8fc7\u671f\u65f6\u95f4\u65f6\u53ef\u4ee5\u52a0\u4e0a\u968f\u673a\u7684\u65f6\u95f4\u5dee\uff0c\u4ee5\u907f\u514d\u6b64\u7c7b\u4e8b\u60c5\u7684\u53d1\u751f\u3002<\/p>\n

\n
redis.expire_at(key, random.randint(86400) + expire_ts)<\/code><\/pre>\n<\/div>\n
\u4ece\u5e93\u7684\u8fc7\u671f\u7b56\u7565<\/h4>\n
\u4ece\u5e93\u4e0d\u4f1a\u8fdb\u884c\u8fc7\u671f\u626b\u63cf\uff0c\u4ece\u5e93\u5bf9\u8fc7\u671f\u7684\u5904\u7406\u662f\u88ab\u52a8\u7684\u3002\u4e3b\u5e93\u5728 key \u5230\u671f\u65f6\uff0c\u4f1a\u5728 AOF\u6587\u4ef6\u91cc\u589e\u52a0\u4e00\u6761 del \u6307\u4ee4\uff0c\u540c\u6b65\u5230\u6240\u6709\u7684\u4ece\u5e93\uff0c\u4ece\u5e93\u901a\u8fc7\u6267\u884c\u8fd9\u6761 del \u6307\u4ee4\u6765\u5220\u9664\u8fc7\u671f\u7684key\u3002 
\n\u56e0\u4e3a\u6307\u4ee4\u540c\u6b65\u662f\u5f02\u6b65\u8fdb\u884c\u7684\uff0c\u6240\u4ee5\u4e3b\u5e93\u8fc7\u671f\u7684 key \u7684 del \u6307\u4ee4\u6ca1\u6709\u53ca\u65f6\u540c\u6b65\u5230\u4ece\u5e93\u7684 
\n\u8bdd\uff0c\u4f1a\u51fa\u73b0\u4e3b\u4ece\u6570\u636e\u7684\u4e0d\u4e00\u81f4\uff0c\u4e3b\u5e93\u6ca1\u6709\u7684\u6570\u636e\u5728\u4ece\u5e93\u91cc\u8fd8\u5b58\u5728\uff0c\u6bd4\u5982\u96c6\u7fa4\u73af\u5883\u5206\u5e03\u5f0f\u9501\u7684\u7b97\u6cd5\u6f0f\u6d1e\u5c31\u662f\u56e0\u4e3a\u8fd9\u4e2a\u540c\u6b65\u5ef6\u8fdf\u4ea7\u751f\u7684\u3002<\/p>\n
\u4e8c\u3001\u5185\u5b58\u6ea2\u51fa\u63a7\u5236\u7b56\u7565<\/h2>\n
\u5f53Redis\u6240\u7528\u5185\u5b58\u8fbe\u5230maxmemory\u4e0a\u9650\u65f6(used_memory > maxmemory)\u4f1a\u89e6\u53d1\u76f8\u5e94\u7684\u6ea2\u51fa\u63a7\u5236\u7b56\u7565\u3002\u5177\u4f53\u7b56\u7565\u53d7maxmemory-policy\u53c2\u6570\u63a7\u5236\uff0cRedis\u652f\u63016\u79cd\u7b56\u7565\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
\n
1\uff09noeviction\uff1a\u9ed8\u8ba4\u7b56\u7565\uff0c\u4e0d\u4f1a\u5220\u9664\u4efb\u4f55\u6570\u636e\uff0c\u62d2\u7edd\u6240\u6709\u5199\u5165\u64cd\u4f5c\u5e76\u8fd4\u56de\u5ba2\u6237\u7aef\u9519\u8bef\u4fe1\u606f\uff08error\uff09OOM command not allowed when used memory\uff0c\u6b64\u65f6Redis\u53ea\u54cd\u5e94\u8bfb\u64cd\u4f5c\u3002 
\n  2\uff09volatile-lru\uff1a\u6839\u636eLRU\u7b97\u6cd5\u5220\u9664\u8bbe\u7f6e\u4e86\u8d85\u65f6\u5c5e\u6027\uff08expire\uff09\u7684\u952e\uff0c\u76f4\u5230\u817e\u51fa\u8db3\u591f\u7a7a\u95f4\u4e3a\u6b62\u3002\u5982\u679c\u6ca1\u6709\u53ef\u5220\u9664\u7684\u952e\u5bf9\u8c61\uff0c\u56de\u9000\u5230noeviction\u7b56\u7565\u3002 
\n  3\uff09allkeys-lru\uff1a\u6839\u636eLRU\u7b97\u6cd5\u5220\u9664\u952e\uff0c\u4e0d\u7ba1\u6570\u636e\u6709\u6ca1\u6709\u8bbe\u7f6e\u8d85\u65f6\u5c5e\u6027\uff0c\u76f4\u5230\u817e\u51fa\u8db3\u591f\u7a7a\u95f4\u4e3a\u6b62\u3002 
\n  4\uff09allkeys-random\uff1a\u968f\u673a\u5220\u9664\u6240\u6709\u952e\uff0c\u76f4\u5230\u817e\u51fa\u8db3\u591f\u7a7a\u95f4\u4e3a\u6b62\u3002 
\n  5\uff09volatile-random\uff1a\u968f\u673a\u5220\u9664\u8fc7\u671f\u952e\uff0c\u76f4\u5230\u817e\u51fa\u8db3\u591f\u7a7a\u95f4\u4e3a\u6b62\u3002 
\n  6\uff09volatile-ttl\uff1a\u6839\u636e\u952e\u503c\u5bf9\u8c61\u7684ttl\u5c5e\u6027\uff0c\u5220\u9664\u6700\u8fd1\u5c06\u8981\u8fc7\u671f\u6570\u636e\u3002\u5982\u679c\u6ca1\u6709\uff0c\u56de\u9000\u5230noeviction\u7b56\u7565\u3002<\/p>\n<\/blockquote>\n
 
\n\u9891\u7e41\u6267\u884c\u56de\u6536\u5185\u5b58\u6210\u672c\u5f88\u9ad8\uff0c\u4e3b\u8981\u5305\u62ec\u67e5\u627e\u53ef\u56de\u6536\u952e\u548c\u5220\u9664\u952e\u7684\u5f00\u9500\uff0c\u56e0\u6b64\u60f3\u8981\u4f4e\u54cd\u5e94\u5ef6\u8fdf\u7684\u573a\u666f\uff0c\u5e94\u8be5\u5c3d\u91cf\u907f\u514d\u5185\u5b58\u6ea2\u51fa\u3002<\/p>\n
\u4e09\u3001\u8fc7\u671fKey\u548c\u88ab\u9010\u51faKey\u7684\u76d1\u63a7<\/h2>\n
\u5185\u5b58\u6ea2\u51fa\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7rate(redis_evicted_keys_total[5m]) \u6765\u76d1\u63a7\u88ab\u9010\u51faKey\u7684\u6570\u91cf\u3002 
\n\u8fc7\u671f\u7684Key\uff0c\u53ef\u4ee5\u901a\u8fc7rate(redis_expired_keys_total[5m]) \u6765\u76d1\u63a7\u3002 
\n<\/p>\n
\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1aIPCPU-\u7f51\u7edc\u4e4b\u8def<\/a> » Redis\u8fc7\u671fKey\u3001\u5185\u5b58\u56de\u6536\u7684\u4e00\u4e9b\u7ec6\u8282<\/a><\/p>","protected":false},"excerpt":{"rendered":"
Redis\u53ef\u4ee5\u8bf4\u662f\u4e00\u4e2a\u5185\u5b58\u7ea7\u6570\u636e\u5e93\uff0c\u53d7\u9650\u4e8e\u7269\u7406\u5185\u5b58\u7684\u5927\u5c0f\uff0c\u6211\u4eec\u4f1a\u9650\u5236Redis\u5bf9\u5185\u5b58\u7684\u4f7f\u7528\uff0c\u8fd9\u5728Redis\u4e2d\u4e3b\u8981\u4f53\u73b0\u5728\u4ee5\u4e0b\u4e24\u4e2a\u65b9\u9762\uff1a \u5220\u9664\u5df2\u7ecf\u8fc7\u671f\u7684Key \u5185\u5b58\u4f7f\u7528\u8fbe\u5230maxmemory\u4e0a\u9650\u65f6\u89e6\u53d1\u5185\u5b58\u6ea2\u51fa\u63a7\u5236\u7b56\u7565 \u4e00\u3001\u5220\u9664\u5df2\u7ecf\u8fc7\u671f\u7684Key redis \u4f1a\u5c06\u6bcf\u4e2a\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684 key \u653e\u5165\u5230\u4e00\u4e2a\u72ec\u7acb\u7684\u5b57\u5178\u4e2d\uff0c\u4ee5\u540e\u4f1a\u5b9a\u65f6\u904d\u5386\u8fd9\u4e2a\u5b57\u5178\u6765\u5220\u9664\u5230\u671f\u7684 key\u3002\u9664\u4e86\u5b9a\u65f6\u904d\u5386\u4e4b\u5916\uff0c\u5b83\u8fd8\u4f1a\u4f7f\u7528\u60f0\u6027\u7b56\u7565\u6765\u5220\u9664\u8fc7\u671f\u7684 key\uff0c\u5b9a\u65f6\u5220\u9664\u662f\u96c6\u4e2d\u5904\u7406\uff0c\u60f0\u6027\u5220\u9664\u662f\u96f6\u6563\u5904\u7406\u3002 \u60f0\u6027\u5220\u9664 \u6240\u8c13\u60f0\u6027\u7b56\u7565\u5c31\u662f\u5728\u5ba2\u6237\u7aef\u8bbf\u95ee\u8fd9\u4e2a key \u7684\u65f6\u5019\uff0credis \u5bf9 key 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