stats命令用于返回统计信息
语法：
stats
stats STAT pid 812 STAT uptime 4296 STAT time 1470637657 STAT version 1.4.15 STAT libevent 2.0.21-stable STAT pointer_size 64 STAT rusage_user 0.110351 STAT rusage_system 0.220702 STAT curr_connections 10 STAT total_connections 18 STAT connection_structures 11 STAT reserved_fds 20 STAT cmd_get 32 STAT cmd_set 32 STAT cmd_flush 0 STAT cmd_touch 0 STAT get_hits 25 STAT get_misses 7 STAT delete_misses 6 STAT delete_hits 4 STAT incr_misses 0 STAT incr_hits 1 STAT decr_misses 0 STAT decr_hits 1 STAT cas_misses 1 STAT cas_hits 2 STAT cas_badval 0 STAT touch_hits 0 STAT touch_misses 0 STAT auth_cmds 0 STAT auth_errors 0 STAT bytes_read 1745 STAT bytes_written 1565 STAT limit_maxbytes 67108864 STAT accepting_conns 1 STAT listen_disabled_num 0 STAT threads 4 STAT conn_yields 0 STAT hash_power_level 16 STAT hash_bytes 524288 STAT hash_is_expanding 0 STAT bytes 140 STAT curr_items 2 STAT total_items 26 STAT expired_unfetched 1 STAT evicted_unfetched 0 STAT evictions 0 STAT reclaimed 11 END