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Oracle Error Codes

ORA-00000: normal, successful completion
Cause: Normal exit.
Action: None.

ORA-00001: unique constraint (string.string) violated
Cause: An UPDATE or INSERT statement attempted to insert a duplicate key. For Trusted Oracle configured in DBMS MAC mode, you may see this message if a duplicate entry exists at a different level.
Action: Either remove the unique restriction or do not insert the key.

ORA-00017: session requested to set trace event
Cause: The current session was requested to set a trace event by another session.
Action: This is used internally; no action is required.

ORA-00018: maximum number of sessions exceeded
Cause: All session state objects are in use.
Action: Increase the value of the SESSIONS initialization parameter.

ORA-00019: maximum number of session licenses exceeded
Cause: All licenses are in use.
Action: Increase the value of the LICENSE MAX SESSIONS initialization parameter.

ORA-00020: maximum number of processes (string) exceeded
Cause: All process state objects are in use.
Action: Increase the value of the PROCESSES initialization parameter.

ORA-00021: session attached to some other process; cannot switch session
Cause: The user session is currently used by others.
Action: Do not switch to a session attached to some other process.

ORA-00022: invalid session ID; access denied
Cause: Either the session specified does not exist or the caller does not have the privilege to access it.
Action: Specify a valid session ID that you have privilege to access, that is either you own it or you have the CHANGE_USER privilege.

ORA-00023: session references process private memory; cannot detach session
2-2 Oracle Database Error Messages
Cause: An attempt was made to detach the current session when it contains references to process private memory.
Action: A session may contain references to process memory (PGA) if it has an open network connection, a very large context area, or operating system privileges. To allow the detach, it may be necessary to close the session"s database links and/or cursors. Detaching a session with operating system privileges is always disallowed.

ORA-00024: logins from more than one process not allowed in single-process mode
Cause: Trying to login more than once from different processes for ORACLE started in single-process mode.
Action: Logoff from the other process.

ORA-00025: failed to allocate string
Cause: Out of memory.
Action: Restart with larger sga heap.

ORA-00026: missing or invalid session ID
Cause: Missing or invalid session ID string for ALTER SYSTEM KILL SESSION.
Action: Retry with a valid session ID.

ORA-00027: cannot kill current session
Cause: Attempted to use ALTER SYSTEM KILL SESSION to kill the current session.
Action: None.

ORA-00028: your session has been killed
Cause: A privileged user has killed your session and you are no longer logged on to the database.
Action: Login again if you wish to continue working.

ORA-00029: session is not a user session
Cause: The session ID specified in an ALTER SYSTEM KILL SESSION command was not a user session (for example, recursive, etc.).
Action: Retry with a user session ID.

ORA-00030: User session ID does not exist.
Cause: The user session ID no longer exists, probably because the session was logged out.
Action: Use a valid session ID.

ORA-00031: session marked for kill
Cause: The session specified in an ALTER SYSTEM KILL SESSION command cannot be killed immediately (because it is rolling back or blocked on a network operation), but it has been marked for kill. This means it will be killed as soon as possible after its current uninterruptable operation is done.
Action: No action is required for the session to be killed, but further executions of the ALTER SYSTEM KILL SESSION command on this session may cause the session to be killed sooner.

ORA-00032: invalid session migration password
Cause: The session migration password specified in a session creation call was invalid (probably too long).
Action: Retry with a valid password (less than 30 chars).