Statistics

There are many different commands that return counters and settings of Memcached server. These can be inspected through a large array of tools or simply by telnet or netcat.

These commands are:

Memcached – Stats

Memcached stats (Statistics) is a command that is used to return server statistics such as PID, version, connections, etc.

Syntax:

Example in Ubuntu

  stats  STAT pid 686  STAT uptime 90  STAT time 1557850817  STAT version 1.5.6 Ubuntu  STAT libevent 2.1.8-stable  STAT pointer_size 64  STAT rusage_user 0.026998  STAT rusage_system 0.053997  STAT max_connections 1024  STAT curr_connections 1  STAT total_connections 2  STAT rejected_connections 0  STAT connection_structures 2  STAT reserved_fds 20  STAT cmd_get 0  STAT cmd_set 0  STAT cmd_flush 0  STAT cmd_touch 0  STAT get_hits 0  STAT get_misses 0  STAT get_expired 0  STAT get_flushed 0  STAT delete_misses 0  STAT delete_hits 0  STAT incr_misses 0  STAT incr_hits 0  STAT decr_misses 0  STAT decr_hits 0  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 7  STAT bytes_written 0  STAT limit_maxbytes 67108864  STAT accepting_conns 1  STAT listen_disabled_num 0  STAT time_in_listen_disabled_us 0  STAT threads 4  STAT conn_yields 0  STAT hash_power_level 16  STAT hash_bytes 524288  STAT hash_is_expanding 0  STAT slab_reassign_rescues 0  STAT slab_reassign_chunk_rescues 0  STAT slab_reassign_evictions_nomem 0  STAT slab_reassign_inline_reclaim 0  STAT slab_reassign_busy_items 0  STAT slab_reassign_busy_deletes 0  STAT slab_reassign_running 0  STAT slabs_moved 0  STAT lru_crawler_running 0  STAT lru_crawler_starts 510  STAT lru_maintainer_juggles 138  STAT malloc_fails 0  STAT log_worker_dropped 0  STAT log_worker_written 0  STAT log_watcher_skipped 0  STAT log_watcher_sent 0  STAT bytes 0  STAT curr_items 0  STAT total_items 0  STAT slab_global_page_pool 0  STAT expired_unfetched 0  STAT evicted_unfetched 0  STAT evicted_active 0  STAT evictions 0  STAT reclaimed 0  STAT crawler_reclaimed 0  STAT crawler_items_checked 0  STAT lrutail_reflocked 0  STAT moves_to_cold 0  STAT moves_to_warm 0  STAT moves_within_lru 0  STAT direct_reclaims 0  STAT lru_bumps_dropped 0  END  

Example in Windows

  stats  STAT pid 4256  STAT uptime 3054537878  STAT time 317417903  STAT version 1.4.4-14-g9c660c0  STAT pointer_size 64  STAT curr_connections 10  STAT total_connections 11  STAT connection_structures 11  STAT cmd_get 0  STAT cmd_set 0  STAT cmd_flush 0  STAT get_hits 0  STAT get_misses 0  STAT delete_misses 0  STAT delete_hits 0  STAT incr_misses 0  STAT incr_hits 0  STAT decr_misses 0  STAT decr_hits 0  STAT cas_misses 0  STAT cas_hits 0  STAT cas_badval 0  STAT auth_cmds 0  STAT auth_errors 0  STAT bytes_read 9  STAT bytes_written 7  STAT limit_maxbytes 67108864  STAT accepting_conns 1  STAT listen_disabled_num 0  STAT threads 4  STAT conn_yields 0  STAT bytes 0  STAT curr_items 0  STAT total_items 0  STAT evictions 0  END  

Memcached Server:

Memcached Client

Stats using Java Application

To get the stats from the Memcached server, we have to use the Memcached stats() method.

Example

  import net.spy.memcached.MemcachedClient;  public class MemcachedJava {     public static void main(String[] args) {                // Connecting to Memcached server on localhost        MemcachedClient mcc = new MemcachedClient(new        InetSocketAddress(“127.0.0.1”, 11211));        System.out.println(“Connection to server successful”);        System.out.println(“Stats:”+mcc.stats);     }  }  

Output:

Connection to server successful  Stats:[/127.0.0.1:11211:[delete_hits:0, bytes:71, total_items:4,  rusage_system:0.220013, touch_misses:0, cmd_touch:0, listen_disabled_num:0,  auth_errors:0, evictions:0, version:1.4.14, pointer_size:64, time:1417279366,  incr_hits:1, threads:4, expired_unfetched:0, limit_maxbytes:67108864,  hash_is_expanding:0, bytes_read:170, curr_connections:8, get_misses:1,  reclaimed:0, bytes_written:225, hash_power_level:16, connection_structures:9,  cas_hits:0, delete_misses:0, total_connections:11, rusage_user:0.356022,  cmd_flush:0, libevent:2.0.19-stable, uptime:12015, reserved_fds:20,  touch_hits:0, cas_badval:0, pid:1138, get_hits:2, curr_items:1, cas_misses:0,  accepting_conns:1, evicted_unfetched:0, cmd_get:3, cmd_set:2, auth_cmds:0,  incr_misses:1, hash_bytes:524288, decr_misses:1, decr_hits:1, conn_yields:0]]

Next TopicMemcached Stats Items

Memcached Stats