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memcached具体使用场景

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Jun 06, 2016 pm 08:23 PM

memcachedphp

请假大家一下，memcached具体在项目中的实际运用场景
我只了解memcached是缓存数据，让数据直接从内存中读取，使用效率会高
但是在实际项目中，什么时候要使用memcached，怎么运用的，还有怎么选择是否需要使用memcached

回复内容：

我补充一个场景：数据库缓存
对于数据变化不大的数据库，我们经常采用缓存机制。
对于同一条SQL查询

从数据库取出数据，然后分别加入系统运算。
对SQL做MD5加密成为唯一的key，同它所查询到的数据存入memcache。
设置好过期时间

当然，还可以用在分布式服务器集群中做session共享，具体我就不介绍了，可以自行百度。

最常用的是跟nginx配合缓存js,css,html等静态文件。包括js合并，css合并。
另外就是用在数据库之前，做简单的缓存。最常见的应该就是member表了。

其实硬盘能缓存的把key组织好都可以扔内存里不过更大的项目都用redis了，但是memcache的却简单啊
常见的，比如session共享就可以用memcache

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