Not to use SCAN in 11gR2 RAC

  • From: Yong Huang <yong321@xxxxxxxxx>
  • To: oracle-l@xxxxxxxxxxxxx
  • Date: Fri, 16 Oct 2009 11:59:22 -0700 (PDT)

We installed RAC on a RHEL 5.3 two-node cluster successfully. It looks 
like SCAN (Single Client Access Name) must be assigned during installation.

We have a company-wide OID to serve DB connection strings for thousands of 
clients. Each entry has load_balance=yes. It works very well. We're OK with 
continuing to use long strings (i.e. multiple address lines for each OID 
entry). Therefore we don't think SCAN provides benefit for our environment. Can 
anybody think of any risk or loss of benefit we haven't thought of? Is there 
any way to completely bypass it, not even bothering our DNS admin to create an 
entry (one or three A records)? If not during installation, can I stop the SCAN 
listener and shutdown its network interface (if I can) and remove it from OCR?

Oracle says SCAN is optional unless you use policy-managed database in 11gR2. 
But it actually becomes mandatory at the time of installation, and then it can 
be optional afterward. Isn't that awkward?

Yong Huang


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