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15 Oracle Errors Questions And Answers

1⟩ ORA-12521 TNSlistener does not currently know of instance requested 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 in addition to

the service name an instance name 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.

 203 views

2⟩ ORA-12519 TNSno appropriate service handler found?

Cause: The listener could not find any available service

handlers that are appropriate for the client connection.

Action: Run "lsnrctl services" to ensure that the

instance(s) have registered with the listener, and are

accepting connections.

 129 views

3⟩ ORA-12518 TNSlistener could not hand off client connection?

Cause: The process of handing off a client connection to

another process failed.

Action: Turn on listener tracing and re-execute the

operation. Verify that the listener and database instance

are properly configured for direct handoff. If problem

persists, call Oracle Support.

 140 views

4⟩ ORA-12516 TNSlistener could not find available handler with matching protocol stack?

Cause: None of the known and available service handlers for

the given SERVICE_NAME support the client's protocol stack:

transport, session, and presentation protocols.

Action: Check to make sure that the service handlers (e.g.

dispatchers) for the given SERVICE_NAME are registered with

the listener, are accepting connections, and that they are

properly configured to support the desired protocols.

 201 views

7⟩ ORA-12514 TNSlistener does not currently know of service requested 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 service name

for a service (usually a database service) 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.

 172 views

9⟩ ORA-12509 TNSlistener 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.

 128 views

12⟩ ORA-12505 TNSlistener 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.

 159 views