Cache和Buffer的區別

一、研究資料庫的人這樣理解：http://wenku.baidu.com/view/32b8b13e376baf1ffc4fad7e.html

Cache和Buffer是兩個不同的概念，簡單的說，Cache是加速“讀”，而buffer是緩衝“寫”，前者解決讀的問題，儲存從磁碟上讀出的資料，後者是解決寫的問題，儲存即將要寫入到磁碟上的資料。在很多情況下，這兩個名詞並沒有嚴格區分，常常把讀寫混合類型稱為buffer cache。

A buffer is something that has yet to be "written" to disk. A cache is something that has been "read" from the disk and stored for later use.

二、編程式的人最好這樣理解：http://wiki.answers.com/Q/The_difference_between_buffer_and_cache

Think of it like this: a “Buffer” is an area where data moves back and forth between two objects. A “Cache” is where data is stored when it  may not be immediately needed, but might be soon. A buffer is like a hallway between two rooms, and a cache is like a closet. Get it?