scan英文單詞細(xì)看、審視等含義,也是軟件名稱。Oracle 11gR2 RAC中引入了SCAN的概念。SCAN全稱是Single Client Access Name ,它是Oracle RAC 11gR2版本的一個(gè)新特性。它為需要訪問(wèn)Oracle集群數(shù)據(jù)的客戶端提供一個(gè)簡(jiǎn)單名字。它的好處是如果你使用SCAN當(dāng)你增長(zhǎng)或踢除集群中的節(jié)點(diǎn)時(shí)客戶端不需要做任何改變,這一點(diǎn)在三層架構(gòu)應(yīng)用系統(tǒng)中(數(shù)據(jù)庫(kù)-應(yīng)用服務(wù)器-客戶機(jī))優(yōu)勢(shì)明顯。使用單個(gè)名字去訪問(wèn)集群允計(jì)客戶端使用EZConnect 客戶端和簡(jiǎn)單JDBC thin URL去訪問(wèn)運(yùn)行在集群中的任何數(shù)據(jù)庫(kù),而不用管在集群中那個(gè)或那些服務(wù)器(或叫實(shí)例)是Active的。
SCAN provides load balancing and failover of client connections to the database. The SCAN works as an IP alias for the cluster.Oracle strongly recommends that you do not configure SCAN VIP addresses in the hosts file. Use DNS resolution for SCAN VIPs. If you use the hosts file to resolve SCANs, then you will only be able to resolve to one IP address and you will have only one SCAN address.
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