session cookie memcache分别怎么用？有什么区别？
php初学者，session cookie memcache分别怎么用？一般在什么情况下使用？有什么区别？请各位牛人帮忙解答，谢谢
回复讨论(解决方案)
memcached是高性能的分布式内存缓存服务器。一般的使用目的是，通过缓存数据库查询结果，减少数据库访问次数，以提高动态web应用的速度、提高扩展性。
其特点
1、协议简单
2、基于libevent的事件处理
3、内置内存存储方式
4、memcached不互相通信的分布式
Session 的作用就是它在 Web服务器上保持用户的状态信息供在任何时间从任何页访问，Session信息存储在服务器
Cookie 可以保持登录信息到用户下次与服务器的会话.Cookie信息存储在本地
Session 和 Cookie 用于保存访问者的私有数据，前者保存在服务器上，后者保存在浏览器中
memcached 用于保存公有的数据（变量和对象），可以在不同的程序实例间交换数据
memcache可以作为数据缓存
http://hi.baidu.com/fdwm_lx/item/e314ebf72e901cdc6225d2d1
简单一点说：
session是保存在服务器中。
cookie是保存在客户端中。
session比cookie更安全。
cookie不占系统资源。
memcache本人也再研究。
你只要知道 cookie 是保存在客户端,且保存数据小,大约4KB左右。
Session是保存在服务器端,大小基本来说没有限制。
http://blog.chinaunix.net/uid-20778583-id-301990.html
本人比较愚钝，这篇文章没有看懂。
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