{"id":201244,"date":"2025-05-10T08:04:16","date_gmt":"2025-05-10T00:04:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/201244\/"},"modified":"2025-05-10T08:04:16","modified_gmt":"2025-05-10T00:04:16","slug":"redis%e8%bf%87%e6%9c%9f%e5%88%a0%e9%99%a4%e7%ad%96%e7%95%a5%e4%b8%8e%e5%86%85%e5%ad%98%e6%b7%98%e6%b1%b0%e7%ad%96%e7%95%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/201244\/","title":{"rendered":"Redis\u8fc7\u671f\u5220\u9664\u7b56\u7565\u4e0e\u5185\u5b58\u6dd8\u6c70\u7b56\u7565"},"content":{"rendered":"

<\/b> <\/p>\n

Redis\u8fc7\u671f\u5220\u9664\u7b56\u7565\u4e0e\u5185\u5b58\u6dd8\u6c70\u7b56\u7565<\/h1>\n

<\/i>\u6536\u85cf<\/span> <\/p>\n

\u672c\u7bc7\u6587\u7ae0\u5411\u5927\u5bb6\u4ecb\u7ecd\u300aRedis\u8fc7\u671f\u5220\u9664\u7b56\u7565\u4e0e\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u300b\uff0c\u4e3b\u8981\u5305\u62ec\u5185\u5b58\u3001\u7b56\u7565\u3001Redis\u5220\u9664\u3001\u6dd8\u6c70\uff0c\u5177\u6709\u4e00\u5b9a\u7684\u53c2\u8003\u4ef7\u503c\uff0c\u9700\u8981\u7684\u670b\u53cb\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b\u3002<\/p>\n

\u8fc7\u671f\u5220\u9664\u7b56\u7565<\/h2>\n

\u8fc7\u671f\u5220\u9664\u7b56\u7565\uff1a<\/strong> redis\u53ef\u4ee5\u5bf9key\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff0c\u56e0\u6b64\u8981\u6709\u76f8\u5e94\u7684\u673a\u5236\u5c06\u5df2\u8fc7\u671f\u7684\u952e\u503c\u5bf9\u5220\u9664\u3002<\/p>\n

\u8bbe\u7f6eRedis\u4e2dkey\u7684\u8fc7\u671f\u65f6\u95f4 (\u5355\u4f4d\uff1a\u79d2)<\/h3>\n
    \n
  • 1\uff09expire key time<\/code>  \u8fd9\u662f\u6700\u5e38\u7528\u7684\u65b9\u5f0f<\/li>\n
  • 2\uff09setex key, seconds, value<\/code> \u5b57\u7b26\u4e32\u72ec\u6709\u7684\u65b9\u5f0f<\/li>\n<\/ul>\n

    \u5982\u679c\u672a\u8bbe\u7f6e\u65f6\u95f4\uff0c\u90a3\u5c31\u662f\u6c38\u4e0d\u8fc7\u671f\u3002<\/strong> \u5982\u679c\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\uff0c\u4f7f\u7528 persist key<\/code> \u8ba9key\u6c38\u4e0d\u8fc7\u671f\u3002<\/p>\n

    \u6bcf\u5f53\u6211\u4eec\u5bf9\u4e00\u4e2a key \u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\uff0cRedis \u4f1a\u628a\u8be5 key \u5e26\u4e0a\u8fc7\u671f\u65f6\u95f4\u5b58\u50a8\u5230\u4e00\u4e2a\u8fc7\u671f\u5b57\u5178<\/strong>\uff08expires dict\uff09\u4e2d\uff0c\u4e5f\u5c31\u662f\u8bf4\u8fc7\u671f\u5b57\u5178\u4fdd\u5b58\u4e86\u6570\u636e\u5e93\u4e2d\u6240\u6709 key \u7684\u8fc7\u671f\u65f6\u95f4\u3002<\/p>\n

    \u8fc7\u671f\u5b57\u5178\u5b58\u50a8\u5728 redisDb \u7ed3\u6784\u4e2d\uff0c\u5982\u4e0b\uff1a<\/strong><\/p>\n

    typedef struct redisDb {\n    dict *dict;    \/* \u5b58\u653e\u7740\u6240\u6709\u7684\u952e\u503c\u5bf9 *\/\n    dict *expires; \/* \u8fc7\u671f\u5b57\u5178: \u952e\u548c\u952e\u7684\u8fc7\u671f\u65f6\u95f4 *\/\n    ....\n} redisDb;\n\/*\n\t\u8fc7\u671f\u5b57\u5178\u6570\u636e\u7ed3\u6784\u7ed3\u6784\u5982\u4e0b\uff1a\n    \u8fc7\u671f\u5b57\u5178\u7684 key \u662f\u4e00\u4e2a\u6307\u9488\uff0c\u6307\u5411\u67d0\u4e2a\u952e\u5bf9\u8c61\uff1b\n    \u8fc7\u671f\u5b57\u5178\u7684 value \u662f\u4e00\u4e2a long long \u7c7b\u578b\u7684\u6574\u6570\uff0c\u8fd9\u4e2a\u6574\u6570\u4fdd\u5b58\u4e86 key \u7684\u8fc7\u671f\u65f6\u95f4\uff1b\n*\/<\/pre>\n
    \u5b57\u5178\u5b9e\u9645\u4e0a\u662f\u54c8\u5e0c\u8868\uff0c\u54c8\u5e0c\u8868\u7684\u6700\u5927\u597d\u5904\u5c31\u662f\u8ba9\u6211\u4eec\u53ef\u4ee5\u7528 O(1) \u7684\u65f6\u95f4\u590d\u6742\u5ea6\u6765\u5feb\u901f\u67e5\u627e\u3002<\/p>\n
    \u5f53\u6211\u4eec\u67e5\u8be2\u4e00\u4e2a key \u65f6\uff0cRedis\u9996\u5148\u68c0\u67e5\u8be5 key\u662f\u5426\u5b58\u5728\u4e8e\u8fc7\u671f\u5b57\u5178\u4e2d\uff1a<\/strong><\/p>\n
      \n
    • \u5982\u679c\u4e0d\u5728\uff0c\u5219\u6b63\u5e38\u8bfb\u53d6\u952e\u503c\uff08\u6ca1\u6709\u8bbe\u7f6e\u8fc7\u671f\u65f6\u95f4\uff09<\/li>\n
    • \u5982\u679c\u5b58\u5728\uff0c\u5219\u4f1a\u83b7\u53d6\u8be5 key \u7684\u8fc7\u671f\u65f6\u95f4\uff0c\u7136\u540e\u4e0e\u5f53\u524d\u7cfb\u7edf\u65f6\u95f4\u8fdb\u884c\u6bd4\u5bf9\uff0c\u5224\u5b9a\u8be5 key\u662f\u5426\u8fc7\u671f<\/li>\n<\/ul>\n
      \u5e38\u89c1\u7684\u4e09\u79cd\u8fc7\u671f\u5220\u9664\u7b56\u7565<\/h3>\n
        \n
      • \u5b9a\u65f6\u5220\u9664\uff1a<\/strong>\u5728\u8bbe\u7f6ekey\u7684\u8fc7\u671f\u65f6\u95f4\u65f6\uff0c\u540c\u65f6\u521b\u5efa\u4e00\u4e2a\u5b9a\u65f6\u4e8b\u4ef6\uff0c\u5f53\u65f6\u95f4\u5230\u8fbe\u65f6\uff0c\u7531\u4e8b\u4ef6\u5904\u7406\u5668\u81ea\u52a8\u6267\u884ckey\u7684\u5220\u9664\u64cd\u4f5c\u3002<\/li>\n
      • \u60f0\u6027\u5220\u9664\uff1a<\/strong>\u4e0d\u4e3b\u52a8\u5220\u9664\u8fc7\u671f\u952e\uff0c\u6bcf\u6b21\u4ece\u6570\u636e\u5e93\u8bbf\u95eekey\u65f6\uff0c\u90fd\u68c0\u6d4bkey\u662f\u5426\u8fc7\u671f\uff0c\u5982\u679c\u8fc7\u671f\u5219\u5220\u9664\u8be5key\u3002<\/li>\n
      • \u5b9a\u671f\u5220\u9664\uff1a<\/strong>\u6bcf\u9694\u4e00\u6bb5\u65f6\u95f4\u300c\u968f\u673a\u300d\u4ece\u6570\u636e\u5e93\u4e2d\u53d6\u51fa\u4e00\u5b9a\u6570\u91cf\u7684key\u8fdb\u884c\u68c0\u67e5\uff0c\u5e76\u5220\u9664\u5176\u4e2d\u7684\u8fc7\u671fkey\u3002<\/li>\n<\/ul>\n
        Redis\u4f7f\u7528\u7528\u7684\u8fc7\u671f\u5220\u9664\u7b56\u7565<\/h3>\n
        Redis \u91c7\u7528\u4e86 \u60f0\u6027\u5220\u9664<\/strong> + \u5b9a\u671f\u5220\u9664<\/strong> \u7684\u65b9\u5f0f\u5904\u7406\u8fc7\u671f\u6570\u636e\uff0c\u4ee5\u6c42\u5728\u5408\u7406\u4f7f\u7528 CPU \u65f6\u95f4\u548c\u907f\u514d\u5185\u5b58\u6d6a\u8d39\u4e4b\u95f4\u53d6\u5f97\u5e73\u8861 \u3002<\/p>\n
          \n
        • \u60f0\u6027\u5220\u9664\u7684\u4f7f\u7528\uff1a<\/strong>\u5f53\u6211\u4eec\u8bbf\u95ee\u4e00\u4e2akey\u65f6\uff0c\u4f1a\u5148\u68c0\u67e5\u8fd9\u4e2akey\u662f\u5426\u8fc7\u671f\uff0c\u5982\u679c\u8fc7\u671f\u5219\u5220\u9664\u8fd9\u4e2akey\u5e76\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aefnull\uff0c\u5426\u5219\u8fd4\u56de\u5bf9\u5e94value<\/li>\n
        • \u5b9a\u671f\u5220\u9664\u7684\u4f7f\u7528<\/strong>\uff1a\u5b9a\u671f\u68c0\u67e5\u4e00\u6b21\u6570\u636e\u5e93\uff0c\u6b64\u914d\u7f6e\u53ef\u901a\u8fc7 Redis \u7684\u914d\u7f6e\u6587\u4ef6 redis.conf \u8fdb\u884c\u914d\u7f6e\uff0c\u914d\u7f6e\u952e\u4e3a hz \u5b83\u7684\u9ed8\u8ba4\u503c\u662f hz 10( \u4ece\u6570\u636e\u5e93\u4e2d\u968f\u673a\u62bd\u53d620\u4e2akey \u8fdb\u884c\u8fc7\u671f\u68c0\u67e5 )<\/li>\n<\/ul>\n
          Redis\u7684\u5b9a\u671f\u5220\u9664\u7684\u6d41\u7a0b<\/h3>\n
            \n
          • \u4ece\u8fc7\u671f\u5b57\u5178\u4e2d\u968f\u673a\u62bd\u53d6 20 \u4e2a key\uff0820\u662f\u5199\u6b7b\u5728\u4ee3\u7801\u4e2d\u7684\uff0c\u4e0d\u53ef\u4fee\u6539\uff09<\/li>\n
          • \u68c0\u67e5\u8fd9 20\u4e2akey\u662f\u5426\u8fc7\u671f\uff0c\u5e76\u5220\u9664\u8fc7\u671f\u7684 key<\/li>\n
          • \u5982\u679c\u672c\u8f6e\u68c0\u67e5\u7684\u5df2\u8fc7\u671f key \u7684\u6570\u91cf\uff0c\u8d85\u8fc7 5 \u4e2a(\u8fc7\u671f key \u7684\u6570\u91cf \/ 20 > 25%)\uff0c\u5219\u518d\u6b21\u62bd\u53d620\u4e2a\u68c0\u67e5\u68c0\u67e5\uff0c\u5982\u679c\u67d0\u4e00\u6b21\u8be5\u6bd4\u4f8b\u5c0f\u4e8e 25%\uff0c\u5219\u7ed3\u675f\u68c0\u67e5\uff0c\u7136\u540e\u7b49\u5f85\u4e0b\u4e00\u8f6e\u518d\u68c0\u67e5<\/li>\n<\/ul>\n
            Redis \u4e3a\u4e86\u4fdd\u8bc1\u5b9a\u671f\u5220\u9664\u4e0d\u4f1a\u51fa\u73b0\u5faa\u73af\u8fc7\u5ea6\uff0c\u5bfc\u81f4\u7ebf\u7a0b\u5361\u6b7b\u73b0\u8c61\uff0c\u4e3a\u6b64\u589e\u52a0\u4e86\u5b9a\u671f\u5220\u9664\u5faa\u73af\u6d41\u7a0b\u7684\u65f6\u95f4\u4e0a\u9650\uff0c\u9ed8\u8ba4\u4e0d\u4f1a\u8d85\u8fc7 25ms\uff08\u8d85\u8fc7\u5c31\u505c\u6b62\u68c0\u67e5\uff09\u3002<\/p>\n
            \u5185\u5b58\u6dd8\u6c70\u7b56\u7565<\/h2>\n
            \u5185\u5b58\u6dd8\u6c70\u7b56\u7565\uff1a<\/strong>redis \u7684\u8fd0\u884c\u5185\u5b58\u5df2\u7ecf\u8d85\u8fc7redis\u8bbe\u7f6e\u7684\u6700\u5927\u5185\u5b58\u540e\uff0c\u4f1a\u4f7f\u7528\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u5220\u9664\u7b26\u5408\u6761\u4ef6\u7684 key\uff0c\u4ee5\u6b64\u6765\u4fdd\u969c Redis \u9ad8\u6548\u7684\u8fd0\u884c\u3002<\/p>\n
            \u8bbe\u7f6eRedis\u6700\u5927\u8fd0\u884c\u5185\u5b58<\/h3>\n
             \u5728\u914d\u7f6e\u6587\u4ef6 redis.conf \u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u53c2\u6570 maxmemory<\/code> \u6765\u8bbe\u5b9a\u6700\u5927\u8fd0\u884c\u5185\u5b58\uff0c\u53ea\u6709\u5728 Redis \u7684\u8fd0\u884c\u5185\u5b58\u8fbe\u5230\u4e86\u6211\u4eec\u8bbe\u7f6e\u7684\u6700\u5927\u8fd0\u884c\u5185\u5b58\uff0c\u624d\u4f1a\u89e6\u53d1\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u3002<\/p>\n
            \u4e0d\u540c\u4f4d\u6570\u7684\u64cd\u4f5c\u7cfb\u7edf\uff0cmaxmemory \u7684\u9ed8\u8ba4\u503c\u662f\u4e0d\u540c\u7684\uff1a<\/strong><\/p>\n
              \n
            • \u5728 64 \u4f4d\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0cmaxmemory \u7684\u9ed8\u8ba4\u503c\u662f 0\uff0c\u8868\u793a\u6ca1\u6709\u5185\u5b58\u5927\u5c0f\u9650\u5236\uff0c\u90a3\u4e48\u4e0d\u7ba1\u7528\u6237\u5b58\u653e\u591a\u5c11\u6570\u636e\u5230 Redis \u4e2d\uff0cRedis \u4e5f\u4e0d\u4f1a\u5bf9\u53ef\u7528\u5185\u5b58\u8fdb\u884c\u68c0\u67e5\uff0c\u76f4\u5230 Redis \u5b9e\u4f8b\u56e0\u5185\u5b58\u4e0d\u8db3\u800c\u5d29\u6e83\u4e5f\u65e0\u4f5c\u4e3a\u3002<\/li>\n
            • \u5728 32 \u4f4d\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0cmaxmemory \u7684\u9ed8\u8ba4\u503c\u662f 3G\uff0c\u56e0\u4e3a 32 \u4f4d\u7684\u673a\u5668\u6700\u5927\u53ea\u652f\u6301 4GB \u7684\u5185\u5b58\uff0c\u800c\u7cfb\u7edf\u672c\u8eab\u5c31\u9700\u8981\u4e00\u5b9a\u7684\u5185\u5b58\u8d44\u6e90\u6765\u652f\u6301\u8fd0\u884c\uff0c\u6240\u4ee5 32 \u4f4d\u64cd\u4f5c\u7cfb\u7edf\u9650\u5236\u6700\u5927 3 GB \u7684\u53ef\u7528\u5185\u5b58\u662f\u975e\u5e38\u5408\u7406\u7684\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u56e0\u4e3a\u5185\u5b58\u4e0d\u8db3\u800c\u5bfc\u81f4 Redis \u5b9e\u4f8b\u5d29\u6e83<\/li>\n<\/ul>\n
              Redis \u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u6709\u54ea\u4e9b\uff1f<\/h3>\n
              Redis \u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u5171\u6709\u516b\u79cd\uff0c\u8fd9\u516b\u79cd\u7b56\u7565\u5927\u4f53\u5206\u4e3a\u300c\u4e0d\u8fdb\u884c\u6570\u636e\u6dd8\u6c70\u300d\u548c\u300c\u8fdb\u884c\u6570\u636e\u6dd8\u6c70\u300d\u4e24\u7c7b\u7b56\u7565<\/p>\n
              \u4e0d\u8fdb\u884c\u6570\u636e\u6dd8\u6c70\u7684\u7b56\u7565\uff1a<\/strong><\/p>\n
                \n
              • noeviction\uff08Redis3.0\u4e4b\u540e\uff0c\u9ed8\u8ba4\u7684\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\uff09\uff1a<\/strong>\u5b83\u8868\u793a\u5f53\u8fd0\u884c\u5185\u5b58\u8d85\u8fc7\u6700\u5927\u8bbe\u7f6e\u5185\u5b58\u65f6\uff0c\u4e0d\u6dd8\u6c70\u4efb\u4f55\u6570\u636e\uff0c\u800c\u662f\u4e0d\u518d\u63d0\u4f9b\u670d\u52a1\uff0c\u76f4\u63a5\u8fd4\u56de\u9519\u8bef<\/li>\n
              • \u8fdb\u884c\u6570\u636e\u6dd8\u6c70\u7684\u7b56\u7565\uff08 \u53c8\u53ef\u4ee5\u7ec6\u5206\u4e3a\u5728\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684\u6570\u636e\u4e2d\u8fdb\u884c\u6dd8\u6c70<\/strong>\u548c\u5728\u6240\u6709\u6570\u636e\u8303\u56f4\u5185\u8fdb\u884c\u6dd8\u6c70<\/strong>\u8fd9\u4e24\u7c7b\u7b56\u7565 \uff09<\/li>\n<\/ul>\n
                \u5728\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684\u6570\u636e\u4e2d\u8fdb\u884c\u6dd8\u6c70\uff1a<\/strong><\/p>\n
                  \n
                • volatile-random\uff1a<\/strong>\u968f\u673a\u6dd8\u6c70\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684\u4efb\u610f\u952e\u503c<\/li>\n
                • volatile-ttl\uff1a<\/strong>\u4f18\u5148\u6dd8\u6c70\u66f4\u65e9\u8fc7\u671f\u7684\u952e\u503c<\/li>\n
                • volatile-lru\uff08Redis3.0 \u4e4b\u524d\uff0c\u9ed8\u8ba4\u7684\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\uff09\uff1a<\/strong>\u6dd8\u6c70\u6240\u6709\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684\u952e\u503c\u4e2d\uff0c\u6700\u4e45\u672a\u4f7f\u7528\u7684\u952e\u503c<\/li>\n
                • volatile-lfu\uff08Redis 4.0 \u540e\u65b0\u589e\u7684\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\uff09\uff1a\u6dd8\u6c70\u6240\u6709\u8bbe\u7f6e\u4e86\u8fc7\u671f\u65f6\u95f4\u7684\u952e\u503c\u4e2d\uff0c\u6700\u5c11\u4f7f\u7528\u7684\u952e\u503c<\/li>\n<\/ul>\n
                  \u5728\u6240\u6709\u6570\u636e\u8303\u56f4\u5185\u8fdb\u884c\u6dd8\u6c70\uff1a<\/strong><\/p>\n
                    \n
                  • allkeys-random\uff1a<\/strong>\u968f\u673a\u6dd8\u6c70\u4efb\u610f\u952e\u503c<\/li>\n
                  • allkeys-lru\uff1a<\/strong>\u6dd8\u6c70\u6574\u4e2a\u952e\u503c\u4e2d\u6700\u4e45\u672a\u4f7f\u7528\u7684\u952e\u503c<\/li>\n
                  • allkeys-lfu\uff08Redis 4.0 \u540e\u65b0\u589e\u7684\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\uff09\uff1a<\/strong>\u6dd8\u6c70\u6574\u4e2a\u952e\u503c\u4e2d\u6700\u5c11\u4f7f\u7528\u7684\u952e\u503c<\/li>\n<\/ul>\n
                    \u53ef\u4ee5\u4f7f\u7528 config get maxmemory-policy \u547d\u4ee4\uff0c\u6765\u67e5\u770b\u5f53\u524d Redis \u7684\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\uff0c\u547d\u4ee4\u5982\u4e0b\uff1a<\/strong><\/p>\n
                     127.0.0.1:6379> config get maxmemory-policy\n 1) \"maxmemory-policy\"\n 2) \"noeviction\"<\/pre>\n
                    Redis \u4f7f\u7528\u7684\u662f noeviction<\/code> \u7c7b\u578b\u7684\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\uff0c\u5b83\u662f Redis 3.0 \u4e4b\u540e\u9ed8\u8ba4\u4f7f\u7528\u7684\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\uff0c\u8868\u793a\u5f53\u8fd0\u884c\u5185\u5b58\u8d85\u8fc7\u6700\u5927\u8bbe\u7f6e\u5185\u5b58\u65f6\uff0c\u4e0d\u6dd8\u6c70\u4efb\u4f55\u6570\u636e\uff0c\u4f46\u65b0\u589e\u64cd\u4f5c\u4f1a\u62a5\u9519\u3002<\/p>\n
                    \u8bbe\u7f6e\u5185\u5b58\u6dd8\u6c70\u7b56\u7565\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a<\/strong><\/p>\n
                      \n
                    • \u65b9\u5f0f\u4e00\uff1a<\/strong>\u901a\u8fc7config set maxmemory-policy \u547d\u4ee4\u8bbe\u7f6e\u3002\u7acb\u5373\u751f\u6548\uff0c\u4e0d\u9700\u8981\u91cd\u542f Redis \u670d\u52a1\uff0c\u4f46\u91cd\u542f Redis \u4e4b\u540e\uff0c\u8bbe\u7f6e\u5c31\u4f1a\u5931\u6548<\/li>\n
                    • \u65b9\u5f0f\u4e8c\uff1a<\/strong>\u901a\u8fc7\u4fee\u6539 Redis \u914d\u7f6e\u6587\u4ef6\u4fee\u6539\uff0c\u8bbe\u7f6emaxmemory-policy \uff0c\u91cd\u542f Redis \u670d\u52a1\u540e\u914d\u7f6e\u4e0d\u4f1a\u4e22\u5931\uff08\u4fee\u6539\u4e86\u914d\u7f6e\u6587\u4ef6\uff0c\u5fc5\u987b\u91cd\u542fRedis\u670d\u52a1\uff0c\u8bbe\u7f6e\u624d\u80fd\u751f\u6548\uff09<\/li>\n<\/ul>\n
                      LRU \u7b97\u6cd5\u548c LFU \u7b97\u6cd5\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/h3>\n
                      LRU<\/strong>\u5168\u79f0\u662f Least Recently Used \u7ffb\u8bd1\u4e3a \u6700\u8fd1\u6700\u5c11\u4f7f\u7528<\/strong>\uff0c\u4f1a\u9009\u62e9\u6dd8\u6c70\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7684\u6570\u636e<\/p>\n
                      Redis \u5e76\u6ca1\u6709\u4f7f\u7528\u8fd9\u6837\u7684\u65b9\u5f0f\u5b9e\u73b0 LRU \u7b97\u6cd5<\/strong>\uff0c\u56e0\u4e3a\u4f20\u7edf\u7684 LRU \u7b97\u6cd5\u5b58\u5728\u4e24\u4e2a\u95ee\u9898\uff1a<\/strong><\/p>\n
                        \n
                      • \u9700\u8981\u7528\u94fe\u8868\u7ba1\u7406\u6240\u6709\u7684\u7f13\u5b58\u6570\u636e\uff0c\u8fd9\u4f1a\u5e26\u6765\u989d\u5916\u7684\u7a7a\u95f4\u5f00\u9500\uff1b<\/li>\n
                      • \u5f53\u6709\u6570\u636e\u88ab\u8bbf\u95ee\u65f6\uff0c\u9700\u8981\u5728\u94fe\u8868\u4e0a\u628a\u8be5\u6570\u636e\u79fb\u52a8\u5230\u5934\u7aef\uff0c\u5982\u679c\u6709\u5927\u91cf\u6570\u636e\u88ab\u8bbf\u95ee\uff0c\u5c31\u4f1a\u5e26\u6765\u5f88\u591a\u94fe\u8868\u79fb\u52a8\u64cd\u4f5c\uff0c\u4f1a\u5f88\u8017\u65f6\uff0c\u8fdb\u800c\u4f1a\u964d\u4f4e Redis \u7f13\u5b58\u6027\u80fd\u3002<\/li>\n<\/ul>\n
                        Redis \u662f\u5982\u4f55\u5b9e\u73b0 LRU \u7b97\u6cd5\u7684\uff1f<\/h3>\n
                        Redis \u5b9e\u73b0\u7684\u662f\u4e00\u79cd\u8fd1\u4f3c LRU \u7b97\u6cd5\uff0c\u76ee\u7684\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u8282\u7ea6\u5185\u5b58\uff0c\u5b83\u7684\u5b9e\u73b0\u65b9\u5f0f\u662f\u5728 Redis \u7684\u5bf9\u8c61\u7ed3\u6784\u4f53\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u989d\u5916\u7684\u5b57\u6bb5\uff0c\u7528\u4e8e\u8bb0\u5f55\u6b64\u6570\u636e\u7684\u6700\u540e\u4e00\u6b21\u8bbf\u95ee\u65f6\u95f4\u3002<\/p>\n
                        \u5f53 Redis \u8fdb\u884c\u5185\u5b58\u6dd8\u6c70\u65f6\uff0c\u4f1a\u4f7f\u7528\u968f\u673a\u91c7\u6837\u7684\u65b9\u5f0f\u6765\u6dd8\u6c70\u6570\u636e\uff0c\u5b83\u662f\u968f\u673a\u53d6 5 \u4e2a\u503c\uff08\u6b64\u503c\u53ef\u914d\u7f6e\uff09\uff0c\u7136\u540e\u6dd8\u6c70\u6700\u4e45\u6ca1\u6709\u4f7f\u7528\u7684\u90a3\u4e2a\u3002<\/p>\n
                        Redis \u5b9e\u73b0\u7684 LRU \u7b97\u6cd5\u7684\u4f18\u70b9\uff1a<\/strong><\/p>\n
                          \n
                        • \u4e0d\u7528\u4e3a\u6240\u6709\u7684\u6570\u636e\u7ef4\u62a4\u4e00\u4e2a\u5927\u94fe\u8868\uff0c\u8282\u7701\u4e86\u7a7a\u95f4\u5360\u7528<\/li>\n
                        • \u4e0d\u7528\u5728\u6bcf\u6b21\u6570\u636e\u8bbf\u95ee\u65f6\u90fd\u79fb\u52a8\u94fe\u8868\u9879\uff0c\u63d0\u5347\u4e86\u7f13\u5b58\u7684\u6027\u80fd<\/li>\n<\/ul>\n
                          \u4f46\u662f LRU \u7b97\u6cd5\u6709\u4e00\u4e2a\u95ee\u9898\uff0c\u65e0\u6cd5\u89e3\u51b3\u7f13\u5b58\u6c61\u67d3\u95ee\u9898<\/strong>\uff0c\u6bd4\u5982\u5e94\u7528\u4e00\u6b21\u8bfb\u53d6\u4e86\u5927\u91cf\u7684\u6570\u636e\uff0c\u800c\u8fd9\u4e9b\u6570\u636e\u53ea\u4f1a\u88ab\u8bfb\u53d6\u8fd9\u4e00\u6b21\uff0c\u90a3\u4e48\u8fd9\u4e9b\u6570\u636e\u4f1a\u7559\u5b58\u5728 Redis \u7f13\u5b58\u4e2d\u5f88\u957f\u4e00\u6bb5\u65f6\u95f4\uff0c\u9020\u6210\u7f13\u5b58\u6c61\u67d3\u3002\u56e0\u6b64\uff0c\u5728 Redis 4.0 \u4e4b\u540e\u5f15\u5165\u4e86 LFU \u7b97\u6cd5<\/strong>\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898<\/p>\n
                          \u4ec0\u4e48\u662f LFU \u7b97\u6cd5\uff1f<\/h3>\n
                          LFU \u5168\u79f0\u662f Least Frequently Used \u7ffb\u8bd1\u4e3a\u6700\u8fd1\u6700\u4e0d\u5e38\u7528\u7684\uff0c<\/strong>LFU \u7b97\u6cd5\u662f\u6839\u636e\u6570\u636e\u8bbf\u95ee\u6b21\u6570\u6765\u6dd8\u6c70\u6570\u636e\u7684\uff0c\u5b83\u7684\u6838\u5fc3\u601d\u60f3\u662f”\u5982\u679c\u6570\u636e\u8fc7\u53bb\u88ab\u8bbf\u95ee\u591a\u6b21\uff0c\u90a3\u4e48\u5c06\u6765\u88ab\u8bbf\u95ee\u7684\u9891\u7387\u4e5f\u66f4\u9ad8”\u3002\u6240\u4ee5\uff0c LFU \u7b97\u6cd5\u4f1a\u8bb0\u5f55\u6bcf\u4e2a\u6570\u636e\u7684\u8bbf\u95ee\u6b21\u6570\u3002\u5f53\u4e00\u4e2a\u6570\u636e\u88ab\u518d\u6b21\u8bbf\u95ee\u65f6\uff0c\u5c31\u4f1a\u589e\u52a0\u8be5\u6570\u636e\u7684\u8bbf\u95ee\u6b21\u6570\u3002\u8fd9\u6837\u5c31\u89e3\u51b3\u4e86\u5076\u5c14\u88ab\u8bbf\u95ee\u4e00\u6b21\u4e4b\u540e\uff0c\u6570\u636e\u7559\u5b58\u5728\u7f13\u5b58\u4e2d\u5f88\u957f\u4e00\u6bb5\u65f6\u95f4\u7684\u95ee\u9898\uff0c\u76f8\u6bd4\u4e8e LRU \u7b97\u6cd5\u4e5f\u66f4\u5408\u7406\u4e00\u4e9b.<\/p>\n
                          Redis \u662f\u5982\u4f55\u5b9e\u73b0 LFU \u7b97\u6cd5\u7684\uff1f<\/h3>\n
                          LFU \u7b97\u6cd5\u76f8\u6bd4\u4e8e LRU \u7b97\u6cd5\u7684\u5b9e\u73b0\uff0c\u591a\u8bb0\u5f55\u4e86\u300c\u6570\u636e\u7684\u8bbf\u95ee\u9891\u6b21\u300d\u7684\u4fe1\u606f\u3002<\/p>\n
                          Redis \u5bf9\u8c61\u7684\u7ed3\u6784\u5982\u4e0b\uff1a<\/strong><\/p>\n
                           typedef struct redisObject {\n     ...\n     unsigned lru:24;  \/\/ 24 bits\uff0c\u7528\u4e8e\u8bb0\u5f55\u5bf9\u8c61\u7684\u8bbf\u95ee\u4fe1\u606f\n     ...\n } robj;<\/pre>\n
                          Redis \u5bf9\u8c61\u5934\u4e2d\u7684 lru \u5b57\u6bb5\uff0c\u5728 LRU \u7b97\u6cd5\u4e0b\u548c LFU \u7b97\u6cd5\u4e0b\u4f7f\u7528\u65b9\u5f0f\u5e76\u4e0d\u76f8\u540c\u3002<\/p>\n
                           \u5728 LRU \u7b97\u6cd5\u4e2d\uff0cRedis \u5bf9\u8c61\u5934\u7684 24 bits \u7684 lru \u5b57\u6bb5\u662f\u7528\u6765\u8bb0\u5f55 key \u7684\u8bbf\u95ee\u65f6\u95f4\u6233\uff0c\u56e0\u6b64\u5728 LRU \u6a21\u5f0f\u4e0b\uff0cRedis\u53ef\u4ee5\u6839\u636e\u5bf9\u8c61\u5934\u4e2d\u7684 lru \u5b57\u6bb5\u8bb0\u5f55\u7684\u503c\uff0c\u6765\u6bd4\u8f83\u6700\u540e\u4e00\u6b21 key \u7684\u8bbf\u95ee\u65f6\u95f4\u957f\uff0c\u4ece\u800c\u6dd8\u6c70\u6700\u4e45\u672a\u88ab\u4f7f\u7528\u7684 key\u3002<\/p>\n
                          \u5728 LFU \u7b97\u6cd5\u4e2d\uff0cRedis\u5bf9\u8c61\u5934\u7684 24 bits \u7684 lru \u5b57\u6bb5\u88ab\u5206\u6210\u4e24\u6bb5\u6765\u5b58\u50a8\uff0c\u9ad8 16bit \u5b58\u50a8 ldt(Last Decrement Time)\uff0c\u4f4e 8bit \u5b58\u50a8 logc(Logistic Counter)\u3002<\/p>\n
                          <\/p>\n
                            \n
                          • ldt \u662f\u7528\u6765\u8bb0\u5f55 key \u7684\u8bbf\u95ee\u65f6\u95f4\u6233<\/li>\n
                          • logc \u662f\u7528\u6765\u8bb0\u5f55 key \u7684\u8bbf\u95ee\u9891\u6b21\uff0c\u5b83\u7684\u503c\u8d8a\u5c0f\u8868\u793a\u4f7f\u7528\u9891\u7387\u8d8a\u4f4e\uff0c\u8d8a\u5bb9\u6613\u6dd8\u6c70\uff0c\u6bcf\u4e2a\u65b0\u52a0\u5165\u7684 key \u7684logc \u521d\u59cb\u503c\u4e3a 5\u3002<\/li>\n<\/ul>\n
                            \n
                            \u6ce8\u610f\uff1a<\/strong>logc\u5e76\u4e0d\u662f\u5355\u7eaf\u7684\u8bbf\u95ee\u6b21\u6570\uff0c\u800c\u662f\u8bbf\u95ee\u9891\u6b21(\u8bbf\u95ee\u9891\u7387)\uff0c\u56e0\u4e3alogc\u4f1a\u968f\u65f6\u95f4\u63a8\u79fb\u800c\u8870\u51cf\u7684\u3002<\/p>\n<\/blockquote>\n
                            \u5728\u6bcf\u6b21 key \u88ab\u8bbf\u95ee\u65f6\uff0c\u4f1a\u5148\u5bf9 logc \u505a\u4e00\u4e2a\u8870\u51cf\u64cd\u4f5c\uff0c\u8870\u51cf\u7684\u503c\u8ddf\u524d\u540e\u8bbf\u95ee\u65f6\u95f4\u7684\u5dee\u8ddd\u6709\u5173\u7cfb\uff0c\u5982\u679c\u4e0a\u4e00\u6b21\u8bbf\u95ee\u7684\u65f6\u95f4\u4e0e\u8fd9\u4e00\u6b21\u8bbf\u95ee\u7684\u65f6\u95f4\u5dee\u8ddd\u5f88\u5927\uff0c\u90a3\u4e48\u8870\u51cf\u7684\u503c\u5c31\u8d8a\u5927\uff0c\u8fd9\u6837\u5b9e\u73b0\u7684 LFU \u7b97\u6cd5\u662f\u6839\u636e\u8bbf\u95ee\u9891\u7387\u6765\u6dd8\u6c70\u6570\u636e\u7684\uff0c\u800c\u4e0d\u53ea\u662f\u8bbf\u95ee\u6b21\u6570\u3002\u8bbf\u95ee\u9891\u7387\u9700\u8981\u8003\u8651 key \u7684\u8bbf\u95ee\u662f\u591a\u957f\u65f6\u95f4\u6bb5\u5185\u53d1\u751f\u7684\u3002key \u7684\u5148\u524d\u8bbf\u95ee\u8ddd\u79bb\u5f53\u524d\u65f6\u95f4\u8d8a\u957f\uff0c\u90a3\u4e48\u8fd9\u4e2a key \u7684\u8bbf\u95ee\u9891\u7387\u76f8\u5e94\u5730\u4e5f\u5c31\u4f1a\u964d\u4f4e\uff0c\u8fd9\u6837\u88ab\u6dd8\u6c70\u7684\u6982\u7387\u4e5f\u4f1a\u66f4\u5927\u3002<\/p>\n
                            \u5bf9 logc \u505a\u5b8c\u8870\u51cf\u64cd\u4f5c\u540e\uff0c\u5c31\u5f00\u59cb\u5bf9 logc \u8fdb\u884c\u589e\u52a0\u64cd\u4f5c\uff0c\u589e\u52a0\u64cd\u4f5c\u5e76\u4e0d\u662f\u5355\u7eaf\u7684 + 1\uff0c\u800c\u662f\u6839\u636e\u6982\u7387\u589e\u52a0\uff0c\u5982\u679c logc \u8d8a\u5927\u7684 key\uff0c\u5b83\u7684 logc \u5c31\u8d8a\u96be\u518d\u589e\u52a0\u3002<\/p>\n
                            \u6240\u4ee5\uff0cRedis \u5728\u8bbf\u95ee key \u65f6\uff0c\u5bf9\u4e8e logc \u662f\u8fd9\u6837\u53d8\u5316\u7684\uff1a \u5148\u6309\u7167\u4e0a\u6b21\u8bbf\u95ee\u8ddd\u79bb\u5f53\u524d\u7684\u65f6\u957f\uff0c\u6765\u5bf9 logc \u8fdb\u884c\u8870\u51cf\uff1b  \u7136\u540e\uff0c\u518d\u6309\u7167\u4e00\u5b9a\u6982\u7387\u589e\u52a0 logc \u7684\u503c<\/p>\n
                            redis.conf \u63d0\u4f9b\u4e86\u4e24\u4e2a\u914d\u7f6e\u9879\uff0c\u7528\u4e8e\u8c03\u6574 LFU \u7b97\u6cd5\u4ece\u800c\u63a7\u5236 logc \u7684\u589e\u957f\u548c\u8870\u51cf\uff1a<\/strong><\/p>\n
                              \n
                            • lfu-decay-time\uff1a<\/strong>\u7528\u4e8e\u8c03\u6574 logc \u7684\u8870\u51cf\u901f\u5ea6\uff0c\u5b83\u662f\u4e00\u4e2a\u4ee5\u5206\u949f\u4e3a\u5355\u4f4d\u7684\u6570\u503c\uff0c\u9ed8\u8ba4\u503c\u4e3a1\uff0clfu-decay-time \u503c\u8d8a\u5927\uff0c\u8870\u51cf\u8d8a\u6162\uff1b<\/li>\n
                            • lfu-log-factor\uff1a<\/strong>\u7528\u4e8e\u8c03\u6574 logc \u7684\u589e\u957f\u901f\u5ea6\uff0clfu-log-factor \u503c\u8d8a\u5927\uff0clogc \u589e\u957f\u8d8a\u6162\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
                              Redis\u8fc7\u671f\u5220\u9664\u7b56\u7565\u4e0e\u5185\u5b58\u6dd8\u6c70...<\/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-201244","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201244","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=201244"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/201244\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=201244"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=201244"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=201244"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}