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Oracle RAC Load balancing and ODBC

Posted on 2006-11-24
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We have just installed an Oracle RAC solution. We still have one old VB app that needs to access one of the databases. My understanding to date has been that to do this I need to configure the TNSnames entry to ignore load balancing as ODBC couldnt cope with this (using the standard MS ODBC drivers).

I'd appreciate any info on whether this is still the case. I'm using the MS for oracle driver version

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Question by:colindow
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Gibu George earned 1000 total points
ID: 18044960
Use the oracle 10g ODBC driver, and add the tns entry like this
RAC =
  (DESCRIPTION =
  (ADDRESS = (PROTOCOL = TCP)(HOST = rac1)(PORT = 1521))
  (ADDRESS = (PROTOCOL = TCP)(HOST = rac2)(PORT = 1521))
  (LOAD_BALANCE = ON)
  (FAILOVER = ON)
  (CONNECT_DATA =
  (SERVICE_NAME = rac)
  (failover_mode = (type=select)(method=basic))
  )
  )

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Author Comment

by:colindow
ID: 18115937
Hi in fact it turned out that there was a rather strange entry in out DNS lookup. We had to use a network trace to find this out. Very odd as it worked intermittently.

Ill mark as answered so that any viewer can see the solution
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