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12c Client: ORA-12154 or TNS-3505 after Upgrade

edited Jul 7, 2016 9:58AM in Database Networking (MOSC) 1 comment

There is an issue with the 12c client and the use of multiple TNS aliases in a tnsnames.ora file.

If you have recently upgraded to 12c and have copied a tnsnames.ora file from an environment

where pre 12c clients existed, please be aware of the following issue:

12c Client: TNS-3505 or ORA-12154 Using TNSNAMES.ORA (Doc ID 2152990.1)


Pre 12c clients would be able to resolve the following style of TNS connect string where
multiple aliases might exist:

MYDB,MYDB.us.oracle.com,MYDB.oracle.com =   <==Multiple aliases separated by a comma.  All forms would be resolvable by a pre-12 client.

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