最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。
Memcached The In the following example, we used the A lot of status information is shown here, and each status item is explainedin detail below: stats the command returns statistics such as PID (process number), version number, number of connections, and so on. 1.15.1. Syntax: ¶
stats basic syntax format of the command is as follows:stats 1.15.2. Example ¶
stats command to output Memcachedservice 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
pid : memcache server process ID uptime :Number of seconds the server has been running time :The server’s current Unix timestamp version : memcache version pointer_size :Operating system pointer size rusage_user :Process accumulates user time rusage_system :Process accumulates system time curr_connections :Current number of connections total_connections total number of connections since Memcached was run connection_structures number of connection structures assigned by Memcached cmd_get : get number of command requests cmd_set : set number of command requests cmd_flush : flush number of command requests get_hits : get number of command hits get_misses : get number of misses of command delete_misses : delete number of misses of command delete_hits : delete number of command hits incr_misses : incr number of misses of command incr_hits : incr number of command hits decr_misses : decr number of misses of command decr_hits : decr number of command hits cas_misses : cas number of misses of command cas_hits : cas number of command hits cas_badval :Number of times to use wiping auth_cmds :The number of times the authentication command was processed auth_errors :Number of authentication failures bytes_read :Read the total number of bytes bytes_written :Total number of bytes sent limit_maxbytes :Total allocated memory size (bytes) accepting_conns :Whether the server has reached the maximum connection (0lap1) listen_disabled_num :Number of monitors that have failed threads :Current number of threads conn_yields :Number of active abandonments of connection operations bytes :Number of bytes currently occupied by storage curr_items :Total number of data currently stored total_items :Total number of data stored since startup evictions :Number of objects released by LRU reclaimed :The number of expired data entries to store new data