{"id":77799,"date":"2026-02-25T14:49:48","date_gmt":"2026-02-25T06:49:48","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/77799.html"},"modified":"2026-02-25T14:49:48","modified_gmt":"2026-02-25T06:49:48","slug":"redis%e8%bf%87%e6%9c%9f%e9%94%ae%e5%88%a0%e9%99%a4%e7%ad%96%e7%95%a5%e6%b7%b1%e5%ba%a6%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/77799.html","title":{"rendered":"Redis\u8fc7\u671f\u952e\u5220\u9664\u7b56\u7565\u6df1\u5ea6\u89e3\u6790"},"content":{"rendered":"

Redis\u8fc7\u671f\u952e\u5220\u9664\u7b56\u7565\u6df1\u5ea6\u89e3\u6790<\/h2>\n

\u5728Redis\u7684\u5b9e\u9645\u5e94\u7528\u4e2d，\u7f13\u5b58\u8fc7\u671f\u3001\u5185\u5b58\u5360\u7528\u8fc7\u9ad8\u662f\u5f00\u53d1\u548c\u8fd0\u7ef4\u8fc7\u7a0b\u4e2d\u9ad8\u9891\u9047\u5230\u7684\u95ee\u9898，\u800c\u8fc7\u671f\u952e\u5220\u9664\u7b56\u7565\u662fRedis\u89e3\u51b3\u8be5\u95ee\u9898\u7684\u6838\u5fc3\u673a\u5236\u3002\u5408\u7406\u7684\u8fc7\u671f\u952e\u5220\u9664\u7b56\u7565\u80fd\u5728CPU\u8d44\u6e90\u5360\u7528\u548c\u5185\u5b58\u5229\u7528\u7387\u4e4b\u95f4\u627e\u5230\u6700\u4f73\u5e73\u8861，\u4e5f\u662fRedis\u9ad8\u6027\u80fd\u7684\u91cd\u8981\u4fdd\u969c\u3002\u672c\u6587\u5c06\u4ece\u8fc7\u671f\u952e\u7684\u57fa\u7840\u64cd\u4f5c\u3001\u6838\u5fc3\u5220\u9664\u7b56\u7565\u3001Redis\u5b9e\u9645\u5b9e\u73b0\u3001\u7279\u6b8a\u573a\u666f\u5904\u7406\u7b49\u65b9\u9762\u5168\u9762\u89e3\u6790\u3002<\/p>\n

\u4e00\u3001\u57fa\u7840\u94fa\u57ab：Redis\u8fc7\u671f\u952e\u7684\u8bbe\u7f6e\u4e0e\u7ba1\u7406<\/h3>\n

\u8981\u7406\u89e3\u8fc7\u671f\u952e\u5220\u9664\u7b56\u7565，\u9996\u5148\u9700\u8981\u638c\u63e1Redis\u4e2d\u8fc7\u671f\u952e\u7684\u57fa\u672c\u64cd\u4f5c，\u4ee5\u53caRedis\u5e95\u5c42\u5982\u4f55\u5b58\u50a8\u8fc7\u671f\u952e\u4fe1\u606f\u3002<\/p>\n

1.1 \u8fc7\u671f\u65f6\u95f4\u7684\u8bbe\u7f6e\u4e0e\u67e5\u8be2<\/h4>\n

Redis\u63d0\u4f9b\u4e86\u591a\u79cd\u547d\u4ee4\u4e3akey\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4，\u540c\u65f6\u652f\u6301\u67e5\u8be2\u5269\u4f59\u5b58\u6d3b\u65f6\u95f4\u3001\u53d6\u6d88\u8fc7\u671f\u65f6\u95f4\u7b49\u64cd\u4f5c，\u8986\u76d6\u79d2\/\u6beb\u79d2\u3001\u65f6\u95f4\u6233\u7b49\u591a\u79cd\u7ef4\u5ea6\u3002<\/p>\n\n\u64cd\u4f5c\u7c7b\u578b\u547d\u4ee4\u8bf4\u660e\u793a\u4f8b<\/tr>\n\n\n\n\n\n\n\n\n\n
\u8bbe\u7f6e\u8fc7\u671f（\u79d2）<\/td>\nexpire key n<\/td>\n\u8bbekey\u5728n\u79d2\u540e\u8fc7\u671f<\/td>\nexpire user:1 60<\/td>\n<\/tr>\n
\u8bbe\u7f6e\u8fc7\u671f（\u6beb\u79d2）<\/td>\npexpire key n<\/td>\n\u8bbekey\u5728n\u6beb\u79d2\u540e\u8fc7\u671f<\/td>\npexpire user:1 60000<\/td>\n<\/tr>\n
\u65f6\u95f4\u6233\u8fc7\u671f（\u79d2）<\/td>\nexpireat key n<\/td>\n\u8bbekey\u5728\u79d2\u7ea7\u65f6\u95f4\u6233n\u540e\u8fc7\u671f<\/td>\nexpireat user:1 1736179200<\/td>\n<\/tr>\n
\u65f6\u95f4\u6233\u8fc7\u671f（\u6beb\u79d2）<\/td>\npexpireat key n<\/td>\n\u8bbekey\u5728\u6beb\u79d2\u7ea7\u65f6\u95f4\u6233n\u540e\u8fc7\u671f<\/td>\npexpireat user:1 1736179200123<\/td>\n<\/tr>\n
\u8bbe\u503c\u540c\u65f6\u8fc7\u671f（\u79d2）<\/td>\nset key value ex n<\/td>\n\u539f\u5b50\u64cd\u4f5c，\u8bbe\u503c\u5e76\u6307\u5b9a\u79d2\u7ea7\u8fc7\u671f<\/td>\nset session 123 ex 60<\/td>\n<\/tr>\n
\u8bbe\u503c\u540c\u65f6\u8fc7\u671f（\u79d2）<\/td>\nsetex key n value<\/td>\n\u4e13\u7528\u547d\u4ee4，\u7b49\u4ef7\u4e8e\u4e0a\u8ff0ex\u64cd\u4f5c<\/td>\nsetex token 300 abc123<\/td>\n<\/tr>\n
\u67e5\u8be2\u5269\u4f59\u65f6\u95f4<\/td>\nttl key<\/td>\n\u8fd4\u56de\u5269\u4f59\u79d2\u6570，-1\u6c38\u4e0d\u8fc7\u671f，-2\u5df2\u8fc7\u671f\/\u4e0d\u5b58\u5728<\/td>\nttl user:1 \u2192 (integer)56<\/td>\n<\/tr>\n
\u53d6\u6d88\u8fc7\u671f\u65f6\u95f4<\/td>\npersist key<\/td>\n\u79fb\u9664key\u7684\u8fc7\u671f\u65f6\u95f4，\u53d8\u4e3a\u6c38\u4e45\u6709\u6548<\/td>\npersist user:1 \u2192 (integer)1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

1.2 \u8fc7\u671f\u5b57\u5178：Redis\u5e95\u5c42\u7684\u8fc7\u671f\u952e\u5b58\u50a8<\/h4>\n

\u5f53\u4e3akey\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u540e，Redis\u4f1a\u5c06\u8be5key\u7684\u8fc7\u671f\u4fe1\u606f\u5b58\u50a8\u5728\u8fc7\u671f\u5b57\u5178（expires dict） \u4e2d，\u8be5\u5b57\u5178\u662fRedis\u6570\u636e\u5e93\u7ed3\u6784redisDb\u7684\u6838\u5fc3\u7ec4\u6210\u90e8\u5206\u3002<\/p>\n

\u5e95\u5c42\u7ed3\u6784\u5b9a\u4e49\u5982\u4e0b：<\/p>\n

typedef<\/span> struct<\/span> redisDb<\/span>{<\/span>
\n dict *<\/span>dict;<\/span> \/\/ \u5b58\u653e\u6570\u636e\u5e93\u6240\u6709\u952e\u503c\u5bf9<\/span>
\n dict *<\/span>expires;<\/span> \/\/ \u8fc7\u671f\u5b57\u5178，\u5b58\u653ekey\u7684\u8fc7\u671f\u65f6\u95f4<\/span>
\n \/\/ \u5176\u4ed6\u5c5e\u6027…<\/span>
\n}<\/span>redisDb;<\/span><\/p>\n

\u8fc7\u671f\u5b57\u5178\u7684\u6838\u5fc3\u7279\u5f81：<\/p>\n

    \n
  • key：\u6307\u5411Redis\u4e2d\u952e\u5bf9\u8c61\u7684\u6307\u9488，\u4e0edict\u4e2d\u7684key\u4e00\u4e00\u5bf9\u5e94；<\/li>\n
  • value：long long\u578b\u6574\u6570，\u5b58\u50a8key\u7684\u6beb\u79d2\u7ea7Unix\u65f6\u95f4\u6233；<\/li>\n
  • \u65f6\u95f4\u590d\u6742\u5ea6：\u57fa\u4e8e\u54c8\u5e0c\u8868\u5b9e\u73b0，\u67e5\u8be2\u3001\u65b0\u589e\u3001\u5220\u9664\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u5747\u4e3aO(1)\u3002<\/li>\n<\/ul>\n

    Redis\u5224\u65ad\u4e00\u4e2akey\u662f\u5426\u8fc7\u671f\u7684\u903b\u8f91\u975e\u5e38\u7b80\u5355：<\/p>\n

  • \u68c0\u67e5\u8be5key\u662f\u5426\u5b58\u5728\u4e8e\u8fc7\u671f\u5b57\u5178\u4e2d，\u4e0d\u5b58\u5728\u5219\u6c38\u4e0d\u8fc7\u671f；<\/li>\n
  • \u82e5\u5b58\u5728，\u5bf9\u6bd4\u5f53\u524d\u7cfb\u7edf\u6beb\u79d2\u65f6\u95f4\u6233\u4e0e\u8fc7\u671f\u5b57\u5178\u4e2d\u7684\u65f6\u95f4\u6233，\u5f53\u524d\u65f6\u95f4\u66f4\u5927\u5219\u5224\u5b9a\u4e3a\u8fc7\u671f\u3002<\/li>\n

    \u4e8c\u3001\u4e09\u5927\u6838\u5fc3\u8fc7\u671f\u952e\u5220\u9664\u7b56\u7565<\/h3>\n

    \u4e1a\u754c\u4e3b\u6d41\u7684\u8fc7\u671f\u952e\u5220\u9664\u7b56\u7565\u5206\u4e3a\u5b9a\u65f6\u5220\u9664\u3001\u60f0\u6027\u5220\u9664\u3001\u5b9a\u671f\u5220\u9664\u4e09\u79cd，\u4e09\u8005\u7684\u6838\u5fc3\u5dee\u5f02\u5728\u4e8e\u5220\u9664\u65f6\u673a\u548c\u8d44\u6e90\u5360\u7528\u503e\u5411，\u5206\u522b\u5bf9\u5e94\u201c\u5185\u5b58\u4f18\u5148\u201d\u3001\u201cCPU\u4f18\u5148\u201d\u3001\u201c\u6298\u4e2d\u5e73\u8861\u201d\u4e09\u79cd\u8bbe\u8ba1\u601d\u8def\u3002<\/p>\n

    2.1 \u5b9a\u65f6\u5220\u9664：\u5185\u5b58\u53cb\u597d，CPU\u4e0d\u53cb\u597d<\/h4>\n

    \u6838\u5fc3\u539f\u7406<\/h5>\n

    \u5728\u4e3akey\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\u7684\u540c\u65f6，\u521b\u5efa\u4e00\u4e2a\u5b9a\u65f6\u4e8b\u4ef6，\u5f53\u65f6\u95f4\u5230\u8fbe\u8fc7\u671f\u70b9\u65f6，\u7531Redis\u4e8b\u4ef6\u5904\u7406\u5668\u81ea\u52a8\u6267\u884c\u8be5key\u7684\u5220\u9664\u64cd\u4f5c\u3002<\/p>\n

    \u6267\u884c\u6d41\u7a0b\u56fe<\/h5>\n

    \u8bbe\u7f6ekey\u8fc7\u671f\u65f6\u95f4 \u2192 \u521b\u5efa\u5b9a\u65f6\u4e8b\u4ef6（\u7ed1\u5b9a\u8fc7\u671f\u65f6\u95f4\u548c\u5220\u9664\u64cd\u4f5c）\u2192 \u65f6\u95f4\u5230\u8fbe \u2192 \u4e8b\u4ef6\u5904\u7406\u5668\u6267\u884c\u5220\u9664 \u2192 key\u88ab\u6e05\u7406<\/p>\n

    \u4f18\u7f3a\u70b9<\/h5>\n
      \n
    • \u2705 \u4f18\u70b9：\u8fc7\u671fkey\u88ab\u7acb\u5373\u5220\u9664，\u65e0\u5185\u5b58\u65e0\u6548\u5360\u7528，\u5bf9\u5185\u5b58\u5229\u7528\u7387\u6700\u53cb\u597d；<\/li>\n
    • \u274c \u7f3a\u70b9：\u82e5\u5b58\u5728\u5927\u91cf\u8fc7\u671fkey，\u4f1a\u521b\u5efa\u5927\u91cf\u5b9a\u65f6\u4e8b\u4ef6，\u9891\u7e41\u89e6\u53d1\u5220\u9664\u64cd\u4f5c，\u5360\u7528\u5927\u91cfCPU\u8d44\u6e90，\u4e25\u91cd\u5f71\u54cdRedis\u7684\u6838\u5fc3\u8bfb\u5199\u6027\u80fd\u3002<\/li>\n<\/ul>\n
      \u9002\u7528\u573a\u666f<\/h5>\n

      \u51e0\u4e4e\u65e0\u5b9e\u9645\u9002\u7528\u573a\u666f，Redis\u672a\u91c7\u7528\u8be5\u7b56\u7565\u3002<\/p>\n

      2.2 \u60f0\u6027\u5220\u9664：CPU\u53cb\u597d，\u5185\u5b58\u53ef\u80fd\u6d6a\u8d39<\/h4>\n

      \u6838\u5fc3\u539f\u7406<\/h5>\n

      Redis\u4e0d\u4e3b\u52a8\u68c0\u6d4b\u548c\u5220\u9664\u8fc7\u671fkey，\u53ea\u6709\u5f53\u5ba2\u6237\u7aef\u8bbf\u95ee\u8be5key\u65f6，\u624d\u4f1a\u68c0\u67e5\u5176\u662f\u5426\u8fc7\u671f；\u82e5\u8fc7\u671f\u5219\u7acb\u5373\u5220\u9664，\u672a\u8fc7\u671f\u5219\u6b63\u5e38\u8fd4\u56de\u952e\u503c\u5bf9\u3002<\/p>\n

      \u6267\u884c\u6d41\u7a0b\u56fe<\/h5>\n

      \u5ba2\u6237\u7aef\u53d1\u8d77key\u8bbf\u95ee\u8bf7\u6c42 \u2192 Redis\u8c03\u7528expireIfNeeded\u51fd\u6570\u68c0\u67e5\u8fc7\u671f\u72b6\u6001 \u2192 \u672a\u8fc7\u671f\u2192\u8fd4\u56de\u952e\u503c\u5bf9
      \n \u2193 \u8fc7\u671f
      \n \u5220\u9664key（\u540c\u6b65\/\u5f02\u6b65）\u2192 \u8fd4\u56denull\u7ed9\u5ba2\u6237\u7aef<\/p>\n

      \u4f18\u7f3a\u70b9<\/h5>\n
        \n
      • \u2705 \u4f18\u70b9：\u4ec5\u5728\u8bbf\u95ee\u65f6\u6267\u884c\u68c0\u67e5，\u51e0\u4e4e\u4e0d\u5360\u7528\u989d\u5916CPU\u8d44\u6e90，\u5b9e\u73b0\u7b80\u5355，\u5bf9CPU\u6700\u53cb\u597d；<\/li>\n
      • \u274c \u7f3a\u70b9：\u82e5\u8fc7\u671fkey\u957f\u671f\u4e0d\u88ab\u8bbf\u95ee，\u4f1a\u4e00\u76f4\u5360\u7528\u5185\u5b58，\u9020\u6210\u5185\u5b58\u6cc4\u6f0f\u98ce\u9669，\u6781\u7aef\u60c5\u51b5\u4e0b\u4f1a\u5bfc\u81f4Redis\u5185\u5b58\u7206\u6ee1\u3002<\/li>\n<\/ul>\n
        \u5173\u952e\u5b9e\u73b0<\/h5>\n

        Redis\u901a\u8fc7\u6838\u5fc3\u51fd\u6570expireIfNeeded\u5b9e\u73b0\u60f0\u6027\u5220\u9664，Redis4.0+\u652f\u6301\u901a\u8fc7lazyfree_lazy_expire\u53c2\u6570\u914d\u7f6e\u540c\u6b65\u5220\u9664\u6216\u5f02\u6b65\u5220\u9664，\u907f\u514d\u5220\u9664\u5927key\u65f6\u963b\u585e\u4e3b\u7ebf\u7a0b\u3002<\/p>\n

        \u6838\u5fc3\u4ee3\u7801\u7247\u6bb5：<\/p>\n

        int<\/span> expireIfNeeded<\/span>(<\/span>redisDb *<\/span>db,<\/span> robj *<\/span>key)<\/span> {<\/span>
        \n mstime_t<\/span> when =<\/span> getExpire<\/span>(<\/span>db,<\/span> key)<\/span>;<\/span>
        \n mstime_t<\/span> now =<\/span> mstime<\/span>(<\/span>)<\/span>;<\/span>
        \n if<\/span> (<\/span>when <<\/span> 0<\/span>)<\/span> return<\/span> 0<\/span>;<\/span> \/\/ \u65e0\u8fc7\u671f\u65f6\u95f4，\u76f4\u63a5\u8fd4\u56de<\/span>
        \n if<\/span> (<\/span>now <=<\/span> when)<\/span> return<\/span> 0<\/span>;<\/span> \/\/ \u672a\u8fc7\u671f，\u76f4\u63a5\u8fd4\u56de<\/span>
        \n \/\/ \u4e3b\u4ece\u6a21\u5f0f\u4e0b，\u4ece\u5e93\u4e0d\u4e3b\u52a8\u5220\u9664，\u4ea4\u7ed9\u4e3b\u5e93\u5904\u7406<\/span>
        \n if<\/span> (<\/span>server.<\/span>masterhost !=<\/span> NULL<\/span>)<\/span> return<\/span> 1<\/span>;<\/span>
        \n server.<\/span>stat_expiredkeys++<\/span>;<\/span> \/\/ \u7edf\u8ba1\u8fc7\u671f\u5220\u9664\u7684key\u6570\u91cf<\/span>
        \n \/\/ \u6839\u636e\u914d\u7f6e\u9009\u62e9\u540c\u6b65\/\u5f02\u6b65\u5220\u9664<\/span>
        \n if<\/span> (<\/span>server.<\/span>lazyfree_lazy_expire)<\/span>
        \n dbAsyncDelete<\/span>(<\/span>db,<\/span> key)<\/span>;<\/span> \/\/ \u5f02\u6b65\u5220\u9664<\/span>
        \n else<\/span>
        \n dbSyncDelete<\/span>(<\/span>db,<\/span> key)<\/span>;<\/span> \/\/ \u540c\u6b65\u5220\u9664<\/span>
        \n notifyKeyspaceEvent<\/span>(<\/span>NOTIFY_EXPIRED,<\/span> "expired"<\/span>,<\/span> key,<\/span> db-><\/span>id)<\/span>;<\/span>
        \n return<\/span> 1<\/span>;<\/span>
        \n}<\/span><\/p>\n

        2.3 \u5b9a\u671f\u5220\u9664：\u6298\u4e2d\u65b9\u6848，\u5e73\u8861CPU\u4e0e\u5185\u5b58<\/h4>\n

        \u6838\u5fc3\u539f\u7406<\/h5>\n

        Redis\u6bcf\u9694\u4e00\u6bb5\u65f6\u95f4，\u968f\u673a\u4ece\u8fc7\u671f\u5b57\u5178\u4e2d\u62bd\u53d6\u4e00\u5b9a\u6570\u91cf\u7684key\u8fdb\u884c\u8fc7\u671f\u68c0\u67e5，\u5220\u9664\u5176\u4e2d\u7684\u8fc7\u671fkey；\u540c\u65f6\u901a\u8fc7\u9650\u5236\u6267\u884c\u65f6\u957f\u548c\u9891\u7387，\u907f\u514d\u5bf9CPU\u9020\u6210\u8fc7\u5ea6\u5360\u7528\u3002<\/p>\n

        \u6267\u884c\u6d41\u7a0b\u56fe<\/h5>\n

        Redis\u4e3b\u7ebf\u7a0b\u89e6\u53d1\u5b9a\u671f\u68c0\u67e5（\u7531serverCron\u8c03\u5ea6）\u2192 \u4ece\u8fc7\u671f\u5b57\u5178\u968f\u673a\u62bd\u53d620\u4e2akey \u2192 \u68c0\u67e5\u5e76\u5220\u9664\u8fc7\u671fkey
        \n\u2192 \u7edf\u8ba1\u8fc7\u671fkey\u5360\u6bd4 \u2192 \u5360\u6bd4>25%\u2192\u91cd\u590d\u62bd\u6837\u5220\u9664 \u2193 \u5360\u6bd4\u226425%\/\u6267\u884c\u65f6\u95f4\u226525ms
        \n \u7ed3\u675f\u672c\u8f6e\u5b9a\u671f\u5220\u9664<\/p>\n

        \u6838\u5fc3\u914d\u7f6e\u4e0e\u89c4\u5219<\/h5>\n

        \u5b9a\u671f\u5220\u9664\u7684\u6267\u884c\u903b\u8f91\u7531Redis\u5e95\u5c42\u8c03\u5ea6\u5668serverCron\u63a7\u5236，\u6838\u5fc3\u89c4\u5219\u548c\u914d\u7f6e\u5982\u4e0b：<\/p>\n

      • \u6267\u884c\u9891\u7387：\u9ed8\u8ba4\u6bcf\u79d2\u6267\u884c10\u6b21，\u53ef\u901a\u8fc7redis.conf\u4e2d\u7684hz\u53c2\u6570\u4fee\u6539（\u53d6\u503c1~500），hz\u8d8a\u9ad8，\u626b\u63cf\u8d8a\u9891\u7e41，\u8fc7\u671fkey\u6e05\u7406\u8d8a\u5feb，\u4f46CPU\u5360\u7528\u8d8a\u9ad8；<\/li>\n
      • \u62bd\u6837\u6570\u91cf：\u6e90\u7801\u5199\u6b7b\u4e3a20\u4e2akey，\u56fa\u5b9a\u4e0d\u53ef\u914d\u7f6e；<\/li>\n
      • \u5faa\u73af\u6761\u4ef6：\u82e5\u672c\u8f6e\u62bd\u6837\u7684\u8fc7\u671fkey\u5360\u6bd4\u8d85\u8fc725%，\u5219\u7ee7\u7eed\u62bd\u6837\u5220\u9664，\u786e\u4fdd\u8fc7\u671fkey\u88ab\u6709\u6548\u6e05\u7406；<\/li>\n
      • \u65f6\u95f4\u4e0a\u9650：\u5355\u6b21\u5b9a\u671f\u5220\u9664\u7684\u6267\u884c\u65f6\u95f4\u4e0d\u8d85\u8fc725ms，\u907f\u514d\u5faa\u73af\u8fc7\u5ea6\u5bfc\u81f4Redis\u4e3b\u7ebf\u7a0b\u5361\u6b7b\u3002<\/li>\n
        \u4f18\u7f3a\u70b9<\/h5>\n
          \n
        • \u2705 \u4f18\u70b9：\u901a\u8fc7\u9891\u7387\u3001\u6570\u91cf\u3001\u65f6\u95f4\u4e09\u91cd\u9650\u5236，\u5e73\u8861\u4e86CPU\u5360\u7528\u548c\u5185\u5b58\u6d6a\u8d39，\u662f\u5b9a\u65f6\u5220\u9664\u548c\u60f0\u6027\u5220\u9664\u7684\u6298\u4e2d\u65b9\u6848；<\/li>\n
        • \u274c \u7f3a\u70b9：\u968f\u673a\u62bd\u6837\u53ef\u80fd\u5bfc\u81f4\u90e8\u5206\u8fc7\u671fkey\u672a\u88ab\u68c0\u6d4b\u5230，\u4ecd\u4f1a\u5b58\u5728\u4e00\u5b9a\u7684\u5185\u5b58\u65e0\u6548\u5360\u7528；\u4e14hz\u53c2\u6570\u9700\u8981\u6839\u636e\u4e1a\u52a1\u573a\u666f\u7cbe\u7ec6\u914d\u7f6e，\u914d\u7f6e\u4e0d\u5f53\u4f1a\u5f71\u54cd\u6548\u679c\u3002<\/li>\n<\/ul>\n

          \u4e09\u3001Redis\u7684\u6700\u7ec8\u9009\u62e9：\u60f0\u6027\u5220\u9664+\u5b9a\u671f\u5220\u9664\u7ec4\u5408\u7b56\u7565<\/h3>\n

          Redis\u5e76\u672a\u9009\u62e9\u5355\u4e00\u7684\u5220\u9664\u7b56\u7565，\u800c\u662f\u91c7\u7528\u60f0\u6027\u5220\u9664+\u5b9a\u671f\u5220\u9664\u7684\u7ec4\u5408\u7b56\u7565，\u5145\u5206\u53d1\u6325\u4e24\u8005\u7684\u4f18\u70b9，\u89c4\u907f\u5404\u81ea\u7684\u7f3a\u70b9，\u5728\u5408\u7406\u4f7f\u7528CPU\u65f6\u95f4\u548c\u5c3d\u91cf\u907f\u514d\u5185\u5b58\u6d6a\u8d39\u4e4b\u95f4\u53d6\u5f97\u6700\u4f73\u5e73\u8861\u3002<\/p>\n

          3.1 \u7ec4\u5408\u7b56\u7565\u6574\u4f53\u6267\u884c\u6d41\u7a0b\u56fe<\/h4>\n

          Redis\u542f\u52a8 \u2192 \u521d\u59cb\u5316\u8fc7\u671f\u5b57\u5178，\u7ef4\u62a4key\u8fc7\u671f\u4fe1\u606f
          \n\u251c\u2500 \u5ba2\u6237\u7aef\u8bbf\u95eekey \u2192 \u60f0\u6027\u5220\u9664：\u6267\u884cexpireIfNeeded\u68c0\u67e5，\u8fc7\u671f\u5219\u5220\u9664
          \n\u2514\u2500 \u540e\u53f0\u5b9a\u671f\u8c03\u5ea6（hz\u63a7\u5236\u9891\u7387）\u2192 \u5b9a\u671f\u5220\u9664：\u968f\u673a\u62bd\u6837\u68c0\u67e5，\u5220\u9664\u8fc7\u671fkey
          \n \u2193 \u5185\u5b58\u5360\u7528\u6301\u7eed\u5347\u9ad8 \u2192 \u89e6\u53d1\u5185\u5b58\u6dd8\u6c70\u7b56\u7565（maxmemory\u63a7\u5236）<\/p>\n

          3.2 \u7ec4\u5408\u7b56\u7565\u7684\u6838\u5fc3\u4f18\u52bf<\/h4>\n
        • CPU\u5360\u7528\u53ef\u63a7：\u60f0\u6027\u5220\u9664\u4ec5\u5728\u8bbf\u95ee\u65f6\u6267\u884c\u68c0\u67e5，\u5b9a\u671f\u5220\u9664\u901a\u8fc7\u4e09\u91cd\u9650\u5236\u63a7\u5236CPU\u6d88\u8017，\u4e0d\u4f1a\u5f71\u54cdRedis\u6838\u5fc3\u4e1a\u52a1；<\/li>\n
        • \u5185\u5b58\u65e0\u6548\u5360\u7528\u53ef\u63a7：\u5b9a\u671f\u5220\u9664\u4e3b\u52a8\u6e05\u7406\u5927\u90e8\u5206\u8fc7\u671fkey，\u60f0\u6027\u5220\u9664\u515c\u5e95\u6e05\u7406\u201c\u6f0f\u7f51\u4e4b\u9c7c\u201d，\u907f\u514d\u8fc7\u671fkey\u957f\u671f\u5806\u79ef；<\/li>\n
        • \u5b9e\u73b0\u8f7b\u91cf\u9ad8\u6548：\u57fa\u4e8e\u8fc7\u671f\u5b57\u5178\u7684O(1)\u67e5\u8be2，\u642d\u914d\u7b80\u5355\u7684\u62bd\u6837\u548c\u68c0\u67e5\u903b\u8f91，\u5e95\u5c42\u5b9e\u73b0\u65e0\u590d\u6742\u5f00\u9500\u3002<\/li>\n

          \u56db\u3001\u7279\u6b8a\u573a\u666f：\u8fc7\u671f\u952e\u7684\u5904\u7406\u89c4\u5219<\/h3>\n

          \u5728Redis\u7684\u4e3b\u4ece\u6a21\u5f0f\u548c\u6301\u4e45\u5316（RDB\/AOF） \u573a\u666f\u4e0b，\u8fc7\u671f\u952e\u7684\u5904\u7406\u6709\u7279\u6b8a\u89c4\u5219，\u8fd9\u662f\u5f00\u53d1\u548c\u8fd0\u7ef4\u4e2d\u5bb9\u6613\u8e29\u5751\u7684\u70b9，\u5fc5\u987b\u91cd\u70b9\u638c\u63e1\u3002<\/p>\n

          4.1 \u4e3b\u4ece\u6a21\u5f0f\u4e0b\u7684\u8fc7\u671f\u952e\u5904\u7406<\/h4>\n

          \u4e3b\u4ece\u6a21\u5f0f\u4e2d，\u4ece\u5e93\u4e0d\u4e3b\u52a8\u6267\u884c\u8fc7\u671f\u952e\u5220\u9664\u64cd\u4f5c，\u6240\u6709\u8fc7\u671f\u952e\u7684\u5220\u9664\u7531\u4e3b\u5e93\u7edf\u4e00\u63a7\u5236，\u4fdd\u8bc1\u4e3b\u4ece\u6570\u636e\u4e00\u81f4\u6027：<\/p>\n

        • \u4e3b\u5e93\u68c0\u6d4b\u5230key\u8fc7\u671f\u540e，\u6267\u884c\u5220\u9664\u64cd\u4f5c，\u5e76\u5728AOF\u6587\u4ef6\u4e2d\u8ffd\u52a0\u4e00\u6761del\u6307\u4ee4；<\/li>\n
        • \u4e3b\u5e93\u901a\u8fc7\u4e3b\u4ece\u540c\u6b65，\u5c06del\u6307\u4ee4\u53d1\u9001\u7ed9\u6240\u6709\u4ece\u5e93；<\/li>\n
        • \u4ece\u5e93\u6267\u884cdel\u6307\u4ee4，\u5b8c\u6210\u8fc7\u671fkey\u7684\u5220\u9664；<\/li>\n
        • \u82e5\u5ba2\u6237\u7aef\u76f4\u63a5\u8bbf\u95ee\u4ece\u5e93\u7684\u8fc7\u671fkey，\u4ece\u5e93\u4f1a\u8fd4\u56de\u539f\u503c，\u76f4\u5230\u6536\u5230\u4e3b\u5e93\u7684del\u6307\u4ee4\u3002<\/li>\n

          4.2 \u6301\u4e45\u5316\u573a\u666f\u4e0b\u7684\u8fc7\u671f\u952e\u5904\u7406<\/h4>\n

          \u8fc7\u671f\u952e\u5728RDB\u548cAOF\u4e24\u79cd\u6301\u4e45\u5316\u6587\u4ef6\u4e2d\u7684\u5904\u7406\u903b\u8f91\u4e0d\u540c，\u5206\u4e3a\u751f\u6210\/\u5199\u5165\u9636\u6bb5\u548c\u52a0\u8f7d\/\u91cd\u5199\u9636\u6bb5\u3002<\/p>\n

          RDB\u6587\u4ef6\u4e2d\u7684\u8fc7\u671f\u952e<\/h5>\n
            \n
          • \u751f\u6210\u9636\u6bb5：\u6301\u4e45\u5316\u751f\u6210\u65b0RDB\u6587\u4ef6\u65f6，Redis\u4f1a\u5bf9key\u8fdb\u884c\u8fc7\u671f\u68c0\u67e5，\u8fc7\u671fkey\u4e0d\u4f1a\u88ab\u5199\u5165RDB\u6587\u4ef6；<\/li>\n
          • \u52a0\u8f7d\u9636\u6bb5：\u4e3b\u5e93\u52a0\u8f7dRDB\u65f6，\u4f1a\u8fc7\u6ee4\u8fc7\u671fkey；\u4ece\u5e93\u52a0\u8f7dRDB\u65f6，\u4f1a\u8f7d\u5165\u6240\u6709key（\u5305\u62ec\u8fc7\u671fkey），\u4f46\u4e3b\u4ece\u540c\u6b65\u540e\u4f1a\u88ab\u6e05\u7406\u3002<\/li>\n<\/ul>\n
            AOF\u6587\u4ef6\u4e2d\u7684\u8fc7\u671f\u952e<\/h5>\n
              \n
            • \u5199\u5165\u9636\u6bb5：\u8fc7\u671fkey\u672a\u88ab\u5220\u9664\u65f6，AOF\u6587\u4ef6\u4f1a\u4fdd\u7559\u5176\u76f8\u5173\u8bb0\u5f55；\u5f53\u8fc7\u671fkey\u88ab\u5220\u9664\u540e，Redis\u4f1a\u5411AOF\u6587\u4ef6\u8ffd\u52a0del\u6307\u4ee4，\u6807\u8bb0\u8be5key\u7684\u5220\u9664；<\/li>\n
            • \u91cd\u5199\u9636\u6bb5：\u6267\u884cAOF\u91cd\u5199\u65f6，Redis\u4f1a\u68c0\u67e5\u5185\u5b58\u4e2d\u7684\u952e\u503c\u5bf9，\u8fc7\u671fkey\u4e0d\u4f1a\u88ab\u5199\u5165\u91cd\u5199\u540e\u7684AOF\u6587\u4ef6\u3002<\/li>\n<\/ul>\n

              \u4e94\u3001\u5ef6\u4f38：\u8fc7\u671f\u5220\u9664\u7b56\u7565\u4e0e\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u7684\u914d\u5408<\/h3>\n

              \u5f53Redis\u7684\u8fd0\u884c\u5185\u5b58\u8fbe\u5230maxmemory\u8bbe\u7f6e\u7684\u4e0a\u9650\u65f6，\u4ec5\u9760\u8fc7\u671f\u5220\u9664\u7b56\u7565\u65e0\u6cd5\u89e3\u51b3\u5185\u5b58\u95ee\u9898，\u6b64\u65f6\u4f1a\u89e6\u53d1\u5185\u5b58\u6dd8\u6c70\u7b56\u7565，\u5220\u9664\u7b26\u5408\u6761\u4ef6\u7684key\u4ee5\u91ca\u653e\u5185\u5b58\u3002\u8fc7\u671f\u5220\u9664\u7b56\u7565\u5904\u7406\u5df2\u8fc7\u671f\u7684key，\u800c\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u5904\u7406\u5185\u5b58\u8d85\u9650\u540e\u7684key，\u4e24\u8005\u914d\u5408\u6784\u6210Redis\u7684\u5b8c\u6574\u5185\u5b58\u7ba1\u7406\u4f53\u7cfb\u3002<\/p>\n

              5.1 \u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u7684\u5206\u7c7b（Redis4.0+\u51718\u79cd）<\/h4>\n

              Redis\u7684\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u5206\u4e3a\u4e09\u5927\u7c7b，\u53ef\u901a\u8fc7maxmemory-policy\u53c2\u6570\u914d\u7f6e：<\/p>\n

            • \u4e0d\u6dd8\u6c70：noeviction（Redis3.0\u540e\u9ed8\u8ba4），\u5185\u5b58\u8d85\u9650\u65f6\u62d2\u7edd\u6240\u6709\u5199\u64cd\u4f5c，\u4ec5\u5141\u8bb8\u8bfb\/\u5220\u9664；<\/li>\n
            • \u4ec5\u6dd8\u6c70\u5e26\u8fc7\u671f\u65f6\u95f4\u7684key：volatile-lru\/volatile-lfu\/volatile-random\/volatile-ttl；<\/li>\n
            • \u6dd8\u6c70\u6240\u6709key：allkeys-lru（\u63a8\u8350\u901a\u7528\u573a\u666f）\/allkeys-lfu\/allkeys-random\u3002<\/li>\n

              5.2 \u6838\u5fc3\u63a8\u8350\u914d\u7f6e<\/h4>\n
                \n
              • \u901a\u7528\u4e1a\u52a1\u573a\u666f：allkeys-lru，\u6dd8\u6c70\u6240\u6709key\u4e2d\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7684，\u9002\u914d\u7edd\u5927\u591a\u6570\u7f13\u5b58\u573a\u666f；<\/li>\n
              • \u70ed\u70b9\u6570\u636e\u660e\u663e\u573a\u666f：allkeys-lfu，\u6dd8\u6c70\u8bbf\u95ee\u9891\u7387\u6700\u4f4e\u7684key，\u66f4\u8d34\u5408\u70ed\u70b9\u6570\u636e\u5206\u5e03；<\/li>\n
              • \u6570\u636e\u4e0d\u53ef\u4e22\u5931\u573a\u666f：noeviction，\u62d2\u7edd\u5199\u64cd\u4f5c，\u907f\u514d\u6570\u636e\u4e22\u5931；<\/li>\n
              • \u90e8\u5206\u6570\u636e\u6301\u4e45\u5316\u573a\u666f：volatile-lru，\u4ec5\u6dd8\u6c70\u5e26\u8fc7\u671f\u65f6\u95f4\u7684\u7f13\u5b58key，\u4fdd\u62a4\u6301\u4e45\u5316\u6570\u636e\u3002<\/li>\n<\/ul>\n

                5.3 \u5b9e\u6218\u914d\u7f6e\u547d\u4ee4<\/h4>\n

                # \u4e34\u65f6\u8bbe\u7f6e\u6700\u5927\u5185\u5b58\u4e3a512MB
                \nCONFIG SET maxmemory 536870912
                \n# \u4e34\u65f6\u8bbe\u7f6e\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u4e3aallkeys-lru
                \nCONFIG SET maxmemory-policy allkeys-lru
                \n# \u6301\u4e45\u5316\u914d\u7f6e（\u5199\u5165redis.conf）
                \nCONFIG REWRITE<\/p>\n

                \u516d\u3001\u5b9e\u6218\u914d\u7f6e\u4e0e\u6027\u80fd\u4f18\u5316\u5efa\u8bae<\/h3>\n

                \u7ed3\u5408\u8fc7\u671f\u952e\u5220\u9664\u7b56\u7565\u7684\u539f\u7406，\u7ed9\u51fa\u4ee5\u4e0b\u5b9e\u6218\u914d\u7f6e\u548c\u6027\u80fd\u4f18\u5316\u5efa\u8bae，\u9002\u914d\u5927\u591a\u6570\u751f\u4ea7\u73af\u5883：<\/p>\n

              • \u5408\u7406\u8bbe\u7f6ehz\u53c2\u6570：\u9ed8\u8ba4hz=10，\u82e5Redis\u5185\u5b58\u538b\u529b\u5927\u3001\u8fc7\u671fkey\u591a，\u53ef\u9002\u5f53\u63d0\u9ad8\u81f320~50，\u52a0\u5feb\u5b9a\u671f\u5220\u9664\u9891\u7387；\u82e5CPU\u8d44\u6e90\u7d27\u5f20，\u4fdd\u6301\u9ed8\u8ba4\u5373\u53ef；<\/li>\n
              • \u5f00\u542f\u5f02\u6b65\u5220\u9664：Redis4.0+\u8bbe\u7f6elazyfree_lazy_expire yes，\u907f\u514d\u5220\u9664\u5927key\u65f6\u963b\u585e\u4e3b\u7ebf\u7a0b；<\/li>\n
              • \u7cbe\u51c6\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4：\u6839\u636e\u4e1a\u52a1\u573a\u666f\u4e3akey\u8bbe\u7f6e\u5408\u7406\u7684TTL，\u907f\u514d\u65e0\u610f\u4e49\u7684\u957f\u671f\u7f13\u5b58，\u51cf\u5c11\u8fc7\u671f\u5b57\u5178\u7684\u4f53\u79ef；<\/li>\n
              • \u914d\u7f6e\u5408\u7406\u7684maxmemory：\u6839\u636e\u670d\u52a1\u5668\u5185\u5b58\u5927\u5c0f，\u8bbe\u7f6eRedis\u6700\u5927\u8fd0\u884c\u5185\u5b58（\u5efa\u8bae\u9884\u755930%\u4ee5\u4e0a\u5185\u5b58\u7ed9\u7cfb\u7edf），\u907f\u514d\u5185\u5b58\u7206\u6ee1；<\/li>\n
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