Compile and install Memcached1.4.5 on CentOS5.4

Memcached is a distributed cache system developed by DangaInteractive for LiveJournal, but is currently used by many software such as MediaWiki. This is a set of open-source software, which is licensed by BSDlicense. Memcached lacks authentication and security control, which means that the memcached server should be placed in the firewall

MeMcAchEdIt is a distributed cache system developed by Danga Interactive for LiveJournal, but it is currently used by many software such as MediaWiki. This is a set of open-source software that is licensed by BSD license.

Memcached lacks authentication and security control, which means that the memcached server should be placed behind the firewall.

Memcached's API uses a-bit cyclic redundancy check (CRC-32) to calculate the key value and scatter the data on different machines. When the table is full, the new information will be replaced by the LRU mechanism. Because memcached is generally used as a cache system, memcached applications require additional code to update information in memcached when writing back a slow system (such as a back-end database.