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SINGLE CLIENT ACCESS NAME (SCAN)

SCAN是11gR2里RAC新特性中非常重要的一员。其原理不算复杂,就是把简单Client-Server式的连接方式进行了“过程扩展”。类似于在Client和Server之间添加了一个Proxy代理。 SINGLE CLIENT ACCESS NAME (SCAN) SCAN10大关键的理解是: SCAN VIP不等于10g RAC里的VIP SCAN VIP为3个,均作为clusterware里的resource被拉起来,IP地址会附着在Public网卡上 SCAN... 
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