除了結尾的一個d字差別外(有指結尾的d代表demand守護進程),因為名字混用引起混淆,今日在Debian5.0和Ubuntu10.04LTS試用後理解如下
memcached本身為一個服務守護進程,只有memcacheD没所講的memcache,獨立運行,類似apache server. 會接受客戶端如PHP擴展連線。
而php之下有兩個packges 一個名為php5-memcached 而另一個為php5-memcache,兩者角色一樣同為客戶端,功能略有不同可參考http://www.leonzhang.com/2011/06/24/memcached-vs-php-memcache/和php手冊
memcache http://www.php.net/manual/en/book.memcache.php
memcached http://www.php.net/manual/en/book.memcached.php
舊版Debian 5(backport sources.list) apt-cache 没有php5-memcached只有php5-memcache。相反較新的Ubuntu 10只有php5-memcached
Debian: ~# apt-cache search php5-memcached (有d)
没內容顯示
Debian5: ~# apt-cache search php5-memcache (没有d)
php5-memcache - memcache extension module for PHP5
Ubuntu10:~# apt-cache search php5-memcached
php5-memcached - memcached extension module for PHP5
dpkg -L php5-memcache 或dpkg --get-selections 查看已安裝軟件包
安裝
若要使用memcache,需完整安裝服務器memcached和php對應的客戶端(memcache與memcachd比較) 免混淆,皆加上php5-前綴
安裝server
apt-get install memcached
安裝php擴展
apt-get install php5-memcached
客戶端用法大致相同,會有d字之別,可參閱php手冊。
FAQ - Iterate all items - not design for
http://code.google.com/p/memcached/wiki/FAQ#Can_I_iterate_the_items_of_the_memcached_server?
wiki
http://code.google.com/p/memcached/wiki/NewStart
protocol
http://code.sixapart.com/svn/memcached/trunk/server/doc/protocol.txt
https://github.com/trondn/memcached/blob/master/doc/protocol.txt
中英對照
http://www.jb51.net/shouce/memcached/index.html
一些memcache的特別注意地方
http://www.caiapps.com/memcached-for-load-balancing-sessions/
http://www.caiapps.com/duplicate-key-problem-in-memcache-php/
自訂session handler 用 memcache
http://www.keboola.com/blog/php-sessions-with-memcached-and-a-database-session-in-the-cloud-done-right/
Memcache(d) to store PHP sessions 比較php-memcache和php-memcached
http://beeznest.wordpress.com/2011/04/18/memcached-to-store-php-sessions/
替代品
http://www.mohawksoft.org/?q=node/8
Thursday, June 30, 2011
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14 comments:
網上一例子用php5-memcache處理session,先測試Memcache::connect()是否成功,不成功則用回files 方式處理。但此種方式在php5-memcached並不湊效,因memcached中並没有connect(),只能通過Memcaced::addServer(),但一旦連接失敗,敗會出現
PHP Warning: Unknown: Failed to write session data (memcached). Please verify that the current setting of session.save_path is correct (127.0.0.1:11211) in Unknown on line 0
無法透過if 或者try{} catch 判斷而使用files方式儲存session
這又是兩者的另一區別
what is difference between memcache.redundancy and memcache.session_redundancy?
memcache.redundancy is for stuff you store in memcached yourself with Memcache::add. memcache.session_redundancy is for PHP session data that's stored in memcached.
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