Code: ORA-12505
Description:
 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.
Action:
 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.