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Home php教程 PHP開發(fā) thinkphp的緩存技術(shù)

thinkphp的緩存技術(shù)

Jun 07, 2016 pm 05:23 PM
eaccelerator file home nbsp thinkphp

?如果沒有緩存的網(wǎng)站是百萬級或者千萬級的訪問量,會給數(shù)據(jù)庫或者服務(wù)器造成很大的壓力,通過緩存,大幅減少服務(wù)器和數(shù)據(jù)庫的負(fù)荷。假如我們把讀取數(shù)據(jù)的過程分為三個(gè)層,第一個(gè)是訪問層,第一個(gè)是緩存層,第三個(gè)是數(shù)據(jù)庫存取層。如果沒有緩存層,訪問層是直接從數(shù)據(jù)庫存取層讀取數(shù)據(jù),而設(shè)置緩存后,訪問層不再是直接在數(shù)據(jù)庫存取層讀取,而是從緩存層讀取數(shù)據(jù)。


????我們做個(gè)簡單的對比,假設(shè)一個(gè)頁面,在一個(gè)小時(shí)可被訪問100萬次,如果這個(gè)頁面每次被訪問的時(shí)候,都直接讀取數(shù)據(jù)庫后再編譯生成,在一個(gè)小時(shí)內(nèi)將會重復(fù)性的生成100萬次;而如果這個(gè)頁面被周期性的緩存10分鐘,也就是每間隔10分鐘緩存數(shù)據(jù)才會被生成一次,一個(gè)小時(shí)內(nèi)只會被生成6次,兩種方式一對比,效果明顯,兩種比較下服務(wù)器負(fù)荷的壓力比差別十幾萬倍以上,緩存技術(shù)將使得網(wǎng)站負(fù)載在高峰期游刃有余。?


??????thinkphp的緩存方式有許多種,如File、Apachenote、Apc、Eaccelerator、Memcache、Shmop、Sqlite、Db、Redis和Xcache,現(xiàn)在我來說一下File緩存。

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Thinkphp緩存文件的配置

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Home是我建立的前臺項(xiàng)目,在Home\Conf\config.php找到緩存的配置文件,配置如下:

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