Memcached stats command

The Memcached stats command is used to return statistical information such as PID (process ID), version number, connection count, etc.

Syntax:

The basic syntax format of the stats command is as follows:

stats

Examples

In the following example, we used the stats command to output Memcached service information.

stats
STAT pid 1162
STAT uptime 5022
STAT time 1415208270
STAT version 1.4.14
STAT libevent 2.0.19-stable
STAT pointer_size 64
STAT rusage_user 0.096006
STAT rusage_system 0.152009
STAT curr_connections 5
STAT total_connections 6
STAT connection_structures 6
STAT reserved_fds 20
STAT cmd_get 6
STAT cmd_set 4
STAT cmd_flush 0
STAT cmd_touch 0
STAT get_hits 4
STAT get_misses 2
STAT delete_misses 1
STAT delete_hits 1
STAT incr_misses 2
STAT incr_hits 1
STAT decr_misses 0
STAT decr_hits 1
STAT cas_misses 0
STAT cas_hits 0
STAT cas_badval 0
STAT touch_hits 0
STAT touch_misses 0
STAT auth_cmds 0
STAT auth_errors 0
STAT bytes_read 262
STAT bytes_written 313
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 expired_unfetched 1
STAT evicted_unfetched 0
STAT bytes 142
STAT curr_items 2
STAT total_items 6
STAT evictions 0
STAT reclaimed 1
END

A lot of status information is displayed here. Below is a detailed explanation of each status item:

  • pid: memcache server process ID
  • uptime: server uptime in seconds
  • time: server current Unix timestamp
  • version: memcache version
  • pointer_size: operating system pointer size
  • rusage_user: process cumulative user time
  • rusage_system: process cumulative system time
  • curr_connections: current number of connections
  • total_connections: total number of connections since Memcached started running
  • connection_structures: number of connection structures allocated by Memcached
  • cmd_get: number of get command requests
  • cmd_set: number of set command requests
  • cmd_flush: number of flush command requests
  • get_hits: number of get command hits
  • get_misses: number of get command misses
  • delete_misses: number of delete command misses
  • delete_hits: number of delete command hits
  • incr_misses: number of incr command misses
  • incr_hits: number of incr command hits
  • decr_misses: number of decr command misses
  • decr_hits: number of decr command hits
  • cas_misses: number of cas command misses
  • cas_hits: number of cas command hits
  • cas_badval: number of times used for wiping
  • auth_cmds: number of authentication commands processed
  • auth_errors: number of authentication failures
  • bytes_read: total bytes read
  • bytes_written: total bytes sent
  • limit_maxbytes: total allocated memory size (bytes)
  • accepting_conns: whether the server has reached the maximum number of connections (0/1)
  • listen_disabled_num: number of invalid listeners
  • threads: current number of threads
  • conn_yields: number of connection operations actively abandoned
  • bytes: bytes currently occupied by storage
  • curr_items: total number of currently stored data items
  • total_items: total number of data items stored since startup
  • evictions: number of objects released by LRU
  • reclaimed: number of expired data entries used to store new data
Other extensions