After Upgrade to 11g: Client or DBLink Connections Yield ORA-12504
Last updated on OCTOBER 19, 2017
Applies to:Oracle Net Services - Version 126.96.36.199 to 188.8.131.52 [Release 11.1 to 11.2]
Information in this document applies to any platform.
The problem described in this document would arise after an upgrade of a client from any pre-11g release to 11g and where that client is using the HOSTNAME naming adapter to connect to a listener of an earlier version.
For example, an 11gR2 client using the HOSTNAME adapter method to connect to a 10gR2 listener.
Following an upgrade of a client to 11g, the following error is thrown at connect time:
ORA-12504: TNS:listener was not given the SERVICE_NAME in CONNECT_DATA
The client is using the HOSTNAME naming adapter to connect.
This error would also occur in the case of a DBLink where the origin or source database uses the HOSTNAME adapter and is connecting to a target listener that is 10g or earlier.
An upgrade from a pre-11g client to 11gR1 or newer has taken place and that client is relying on the HOSTNAME naming adapter for TNS resolution.
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