连接 Memcached 并使用

文章

林里克斯

273字数

Linux,Memcached

Memcached 是一个内存中键值存储，用于存储来自数据库调用，API调用或页面呈现结果的任意小数据块（字符串，对象）。

实验平台：CentOS 7.6.1810

Memcached Version：1.6.8

1.连接并使用 set 添加一个值,如果值已经存在则更新，不存在则创建

[Z:\~]$ telnet 10.10.12.3 11211

Connecting to 10.10.12.3:11211...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.
set test_key 0 0 3
100
STORED
get test_key
VALUE test_key 0 3
100
END

2.使用 add 添加值

add test_key 0 0 3
q
NOT_STORED
#已经存在了，添加失败
add name 0 0 1
q
STORED
#添加成功

3.删除值

delete test_key
ERROR
delete test_key
DELETED
get test_key
END
add test_key 0 0 3
q
STORED
get test_key
VALUE test_key 0 3
q
END

4.查看状态信息

stats
STAT pid 17933  #进程id
STAT uptime 1140    #服务运行秒数
STAT time 1604356440    #服务运行秒数
STAT version 1.6.8      #memcached 版本
STAT libevent 2.1.11-stable #libevent 版本
STAT pointer_size 64    #操作系统字的大小
STAT rusage_user 0.078308   #进程累计用户时间
STAT rusage_system 0.221872 #进程累计系统时间
STAT max_connections 256    #最大连接数
STAT curr_connections 1     #已分配连接数
STAT total_connections 11   #服务分配的连接总数
STAT rejected_connections 0 #拒绝连接数
STAT connection_structures 2    #服务分配的链接结构数
STAT response_obj_oom 0
STAT response_obj_count 1
STAT response_obj_bytes 65536
STAT read_buf_count 8
STAT read_buf_bytes 131072
STAT read_buf_bytes_free 49152
STAT read_buf_oom 0
STAT reserved_fds 20
STAT cmd_get 8      #执行 get 命令次数
STAT cmd_set 19     #执行 set 命令次数
STAT cmd_flush 0    #执行 flush 命令次数
STAT cmd_touch 0    #执行 touch 命令次数
STAT cmd_meta 0     #执行 meta 命令次数
STAT get_hits 6     #get 命中次数
STAT get_misses 2   #get 未命中次数
STAT get_expired 0
STAT get_flushed 0
STAT delete_misses 0    #delete 未命中次数
STAT delete_hits 1      #delete 命中次数
STAT incr_misses 0      #incr 自增命令 未命中次数
STAT incr_hits 0        #incr 命中次数
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 915
STAT bytes_written 936
STAT limit_maxbytes 67108864
STAT accepting_conns 1  #已接受的连接数
STAT listen_disabled_num 0
STAT time_in_listen_disabled_us 0
STAT threads 4  当前线程数
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 1530
STAT lru_maintainer_juggles 2050
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 134      #存储的字节数
STAT curr_items 2   #已分配的 items 个数
STAT total_items 6  #items 总数
STAT slab_global_page_pool 0
STAT expired_unfetched 1
STAT evicted_unfetched 0
STAT evicted_active 0
STAT evictions 0    #为获取空间删除的 item 个数
STAT reclaimed 1
STAT crawler_reclaimed 0
STAT crawler_items_checked 4
STAT lrutail_reflocked 0
STAT moves_to_cold 7
STAT moves_to_warm 2
STAT moves_within_lru 0
STAT direct_reclaims 0
STAT lru_bumps_dropped 0
END