web性能分析

1、服務(wù)器端............................................................................................................................................1負(fù)載均衡.......................................................................

2、.............................................................1LVS....................................................................................................................................1反向代理..................

3、..........................................................................................................2DNS..............................................................................................................

4、......................2服務(wù)器集群................................................................................................................................2CDN............................................................

5、...............................................................................2IDC.........................................................................................................................................

6、....3圖片服務(wù)器................................................................................................................................4鏡像服務(wù)器............................................................................

7、....................................................4數(shù)據(jù)庫(kù)端............................................................................................................................................4Mysqlcluster(mysql簇)..

8、.........................................................................................................4數(shù)據(jù)庫(kù)分布式系統(tǒng)..........................................................................................................

9、..........4讀寫(xiě)分離............................................................................................................................4垂直拆分庫(kù):..........................................................................

10、............................................5水平拆分庫(kù)........................................................................................................................5內(nèi)存數(shù)據(jù)庫(kù)............................................

11、....................................................................................5代碼端....................................................................................................................................

12、............6動(dòng)態(tài)頁(yè)面靜態(tài)化........................................................................................................................6Smarty：........................................................................

13、....................................................6Rewrite模塊......................................................................................................................6Memycache..............................

14、...............................................................................................7Sql語(yǔ)句優(yōu)化.....................................................................................................................

15、........7Jscss文件優(yōu)化.........................................................................................................................7上的服務(wù)器，并將從服務(wù)器上得到的結(jié)果返回給inter上請(qǐng)求連接的客戶(hù)端，此時(shí)代理服務(wù)器對(duì)外就表現(xiàn)為一個(gè)服務(wù)器DNS簡(jiǎn)介：DNS負(fù)載均衡的優(yōu)點(diǎn)是經(jīng)濟(jì)簡(jiǎn)單易行，并且

16、服務(wù)器可以位于inter上任意的位置。但它也存在不少缺點(diǎn)：1.為了使本dns服務(wù)器和其他dns服務(wù)器及時(shí)交互，保證dns數(shù)據(jù)及時(shí)更新，使地址能隨機(jī)分配，一般都要將dns的刷新時(shí)間設(shè)置的較小，但太小將會(huì)使dns流量大增造成額外的網(wǎng)絡(luò)問(wèn)題。2.一旦某個(gè)服務(wù)器出現(xiàn)故障，即使及時(shí)修改了dns設(shè)置，還是要等待足夠的時(shí)間（刷新時(shí)間）才能發(fā)揮作用，在此期間，保存了故障服務(wù)器地址的客戶(hù)計(jì)算機(jī)將不能正常訪(fǎng)問(wèn)服務(wù)器。3.dns負(fù)載均衡采用的是簡(jiǎn)單的輪循負(fù)載