ORA-00025 Failed to allocate %s

Cause: Out of memory. Action: Restart with larger sga heap.

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: Log off from the other process.

ORA-00023 Session references process private memory; cannot detach session

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…

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-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-00020 Maximum number of processes (%s) exceeded

Cause: All process state objects are in use. Action: Increase the value of the PROCESSES 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-00018 Maximum number of sessions exceeded

Cause: All session state objects are in use. Action: Increase the value of the SESSIONS initialization parameter.

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-00001 unique constraint (%s.%s) 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.