ORA-12154

The service name could not be found in tnsnames.ora.

Check the service name.

ORA-12162

The connection description has an error.

Check tnanames.ora for syntax, especially mismatched parentheses.

ORA-12163

The connection description is too long.

Correct the problem by shortening the connection description.

ORA-12197

The connection description has an error.

Check tnsnames.ora for syntax errors.

ORA-12198

A path could not be found via interchanges.

Check tnsnav.ora for errors.

ORA-12203

Unable to connect to destination.

Check the underlying network problems, including physical problems or non-functioning routers.

ORA-12208

tnsnav.ora could not be found.

Make sure tnsnav.ora is in the correct directory.

ORA-12210

Improper configuration of tnsnav.ora.

Check tnsnav.ora syntax.

ORA-12500

Could not start a dedicated server process.

Check process count in the operating system and listener.ora parameters.

ORA-12504

SID could not be resolved.

Check CONNECT_DATA in tnsnames.ora and verify that SID is specified correctly.

ORA-12505

SID could not be resolved.

Check listener.ora on the server or run lsnrctl status to make sure a listener is running for the specified SID.

ORA-12510

No dispatcher available to accept a connection using the multithreaded server.

Increase the number of dispatchers available.

ORA-12511

Dispatchers are too busy using the multithreaded server.

Try again or increase the number of dispatchers available.