Oracle Database Errors or Warnings from Error ORA-12500 to ORA-12510


ORA-12500: TNS:listener failed to start a dedicated server process
Cause: The process of starting up a dedicated server process failed. The executable could not be found or the environment may be set up incorrectly.
Action: Turn on tracing at the ADMIN level and reexecute the operation. Verify that the ORACLE Server executable is present and has execute permissions enabled. Ensure that the ORACLE environment is specified correctly in LISTENER.ORA. The Oracle Protocol Adapter that is being called may not be installed on the local hard drive. Please check that the correct Protocol Adapter are successfully linked. If error persists, contact Oracle Customer Support.
ORA-12502: TNS:listener received no CONNECT_DATA from client
Cause: No CONNECT_DATA was passed to the listener.
Action: Check that the service name resolved from TNSNAMES.ORA has the CONNECT_DATA component of the connect descriptor.
ORA-12504: TNS:listener was not given the SERVICE_NAME in CONNECT_DATA
Cause: The listener was not configured with a default service and SERVICE_NAME was missing from the CONNECT_DATA received by the listener.
Action: Possible solutions are:
– Configure DEFAULT_SERVICE parameter in LISTENER.ORA with a valid service name. Reload the listener parameter file using reload [<listener_name>]. This should be done by the LISTENER administrator.

– If using a service name, Check that the connect descriptor corresponding to the service name in TNSNAMES.ORA has a SERVICE_NAME or SID component in the CONNECT_DATA.
ORA-12505: TNS:listener does not currently know of SID given in connect descriptor
Cause: The listener received a request to establish a connection to a database or other service. The connect descriptor received by the listener specified a SID for an instance (usually a database instance) that either has not yet dynamically registered with the listener or has not been statically configured for the listener. This may be a temporary condition such as after the listener has started, but before the database instance has registered with the listener.
– Wait a moment and try to connect a second time.

– Check which instances are currently known by the listener by executing: lsnrctl services <listener name>

– Check that the SID parameter in the connect descriptor specifies an instance known by the listener.

– Check for an event in the listener.log file.

ORA-12508: TNS:listener could not resolve the COMMAND given
Cause: d by incompatible Oracle Net or Net8 versions. Do not include in error manual.
Action: This is not seen in normal use of Oracle Net.

ORA-12509: TNS:listener failed to redirect client to service handler
Cause: The dispatcher terminated unexpectedly
Action: Attempt to connect again and if the same error occurs, contact the DBA to check the state of the dispatchers for this SID. If the problem persists, turn on tracing in the listener to determine the TNS error caused by the redirect.
ORA-12510: TNS:database temporarily lacks resources to handle the request
Cause: The dispatchers appear to be busy handling other requests.
Action: Attempt the connection again. If error persists, ask the DBA to increase the number of dispatchers and/or dispatchers’ limit on number of connections/sessions that they can accept.

Above are list of Oracle Database Errors or Warnings from Error ORA-12500 to ORA-12510 received while performing certain operation against Oracle Database or related products.

What are Oracle Database Error Messages?

Oracle Error Messages may be returned while using products which are part of Oracle Database.  Each Oracle Database Error or Warning Message mentioned above contains the Warning or Error Message Statement, a short explanation of the probable causes of the Error message, and a recommended action.

Hope this was helpful.

SQLServerF1 Team
Information about Oracle Database Error Messages or Warning Messages on Windows and Linux Operating Systems.


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