Ora Error Messages

ORA-00000: normal, successful completion
Cause: Normal exit.Action:
NoneORA-00001: unique constraint (string.string) violated
Cause: An UPDATE or INSERT statement attempted to insert a duplicate key. ForTrusted Oracle configured in DBMS MAC mode, you may see this message if aduplicate 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 theprivilege to access it.
Action: Specify a valid session ID that you have privilege to access, that is either youown it or you have the CHANGE_USER privilege.
ORA-00023: session references process private memory; cannot detach session
Cause: An attempt was made to detach the current session when it contains referencesto process private memory.
Action: A session may contain references to process memory (PGA) if it has an opennetwork connection, a very large context area, or operating system privileges. Toallow the detach, it may be necessary to close the session's database links and/orcursors. 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 startedin 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 currentsession.
Action: NoneORA-00028: your session has been kille

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