Multiple Oracle Homes Problem

I have setup multiple oracle homes to install different oracle db versions & developer products. When developing applicatoins using vb - oledb, how could I point the connection to refer to the oracle home I want so that the required tns information would be available.
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The home that is used will be the one that the tool is installed into.
What you can do is set an environment variable TNS_ADMIN that points to a directory contain a common set of tns files.
All you homes will then use this directory
There ase two significant parameters in registry user by third part sw.


DEFAULT_HOME (name of the default home to be used - probably)
LAST_HOME (number of the home - sometimes)

hi there

u can use the above 2 methods mentioned or create a tnsnames.ora file which will contain all the entries of different databases running in the server. copy this file and put in all of the oracle_home/network/admin folder.

part of the connection string is the machine name in the net and either:
1. instance SID and port the listener listens
2. alias in the tnsnames.ora the listener uses when listens.

So you have to investigate which method your fronend uses.

to find out the current ORACLE_HOME or to switch the default ORACLE_HOME to the one desired:

Go to -->START---->programs----->oracle installation products---->home selector------> Whatever ORACLE_HOME is displayed, it's the default current ORACLE_HOME.  you can  use the dropdown list to change ORACLE_HOME value.

Now you need to put all your existing Oracle database services (TNSNAMES entries ) into one TNSNAMES.ORA file , place this file in the

"%CURRENT_ORACLE_HOME%/network/admin "folder
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