memcached 数据存储
1、memcached简介、安装自行google2、memcached监控与数据导出
在memcached源码目录下的scripts目录中一个perl语言的的脚本，可用于对memcache进行一些日常查询与监控
用法如下：
#./memcached-tool
Usage: memcached-tool
memcached-tool 10.0.0.5:11211 display # shows slabs
memcached-tool 10.0.0.5:11211 # same.(default is display)
memcached-tool 10.0.0.5:11211 stats # shows general stats
memcached-tool 10.0.0.5:11211 dump # dumps keys and values
memcached-tool 10.0.0.5:11211 move 7 9 # takes 1MB slab from class #7
# to class #9.
You can only move slabs around once memory is totally allocated, and only
once the target class is full.(So you can't move from #6 to #9 and #7
to #9 at the same itme, since you'd have to wait for #9 to fill from
the first reassigned page) 2.1memcache状态查询
#./memcached-tool 192.168.10.1:11211 stats
#192.168.10.1:11211 Field Value
accepting_conns 1
bytes 0
bytes_read 20
bytes_written 5
cmd_flush 0
cmd_get 0
cmd_set 0
connection_structures 3
curr_connections 2
curr_items 0
evictions 0
get_hits 0
get_misses 0
limit_maxbytes 67108864
listen_disabled_num 0
pid 18088
pointer_size 32
rusage_system 0.000999
rusage_user 0.000000
threads 2
time1422969575
total_connections 4
total_items 0
uptime 25344
version 1.2.8 是不是so eay
2.2导出memcache内在中的key与value值，命令如下：
# ./memcached-tool 192.168.10.1:11211 dump >./memcachekeys 是不是很简单，当时我心情也和你一样；不过别高兴太早，经过大量数据测试，发现导出的key与内在的key数量不同，要少很多；后来经过大量google得之，memcached自身有缓冲区大小限制，最大2M。这个问题至今没有得到解决，如有大神或路过的兄弟有此问题解决方法，请mail之waitingtome@gmail.com。
2.3 memcached数据导入
#nc 192.168.10.1 11211
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