Database - RAC/Scalability (MOSC)

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scan listener

edited Sep 23, 2015 10:02AM in Database - RAC/Scalability (MOSC) 4 commentsAnswered

Hi Experts,

I'm a Unix admin, I have query regarding scan listener ,

we have two node RAC cluster running 11gr2, SCAN listener "scan-prod" has DNS host record which has 3 ip's (192.168.1.4 - 192.168.1.6).

Node1 has 192.168.1.5 & 192.168.1.6

oracle   28616     1  0 Aug23 ?        00:38:26 /opt/app/oracle/product/11.2.0/grid/bin/tnslsnr LISTENER_SCAN2 -inherit

oracle   28710     1  0 Aug23 ?        00:39:22 /opt/app/oracle/product/11.2.0/grid/bin/tnslsnr LISTENER_SCAN3 -inherit

Node2 has 192.168.1.4

oracle   55167     1  0 Aug30 ?        01:14:08 /opt/app/oracle/product/11.2.0/grid/bin/tnslsnr LISTENER -inherit

oracle   59103     1  0 Aug23 ?        00:41:10 /opt/app/oracle/product/11.2.0/grid/bin/tnslsnr LISTENER_SCAN1 -inherit

DNS record round-robin works like:- The client (or Resolver) will always use the first one. The next time DNS receives a query for this name the order of the list of IP addresses is changed in a round robin fashion (the address that was first in the previous list will be last in the new list).

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