Welcome to the Technical Portal: ORA-00000 to ORA-00025
| ORA Code | Code Description | Cause | Action |
| ORA-00000 | Normal and Successful Completion | Normal Exit | None |
| ORA-00001 | Unique Constraint | An update or insert statement has tried to insert a duplicate key | Either remove the unique restriction or don't insert the key |
| ORA-00002 | Message 2 not found; product=RDBMS; facility=ORA | ||
| ORA-00003 | Message 3 not found; product=RDBMS; facility=ORA | ||
| ORA-00004 | Message 4 not found; product=RDBMS; facility=ORA | ||
| ORA-00005 |
Message 5 not found; product=RDBMS; facility=ORA |
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| ORA-00006 | Message 6 not found; product=RDBMS; facility=ORA | ||
| ORA-00007 | Message 7 not found; product=RDBMS; facility=ORA | ||
| ORA-00008 | Message 8 not found; product=RDBMS; facility=ORA | ||
| ORA-00009 | Message 9 not found; product=RDBMS; facility=ORA | ||
| ORA-00010 | Message 10 not found; product=RDBMS; facility=ORA | ||
| ORA-00011 | Message 11 not found; product=RDBMS; facility=ORA | ||
| ORA-00012 | Message 12 not found; product=RDBMS; facility=ORA | ||
| ORA-00013 | Message 13 not found; product=RDBMS; facility=ORA | ||
| ORA-00014 | Message 14 not found; product=RDBMS; facility=ORA | ||
| ORA-00015 | Message 15 not found; product=RDBMS; facility=ORA | ||
| ORA-00016 | Message 16 not found; product=RDBMS; facility=ORA | ||
| ORA-00017 | Session requested to set trace event | The current session was requested to set a trace event by another session | This is used internally; no action is required |
| ORA-00018 | Maximum number of sessions exceeded | All session state objects are in use | Increase the value of the SESSIONS initialization parameter |
| ORA-00019 | Maximum number of session licenses exceeded | All licenses are in use | Increase the value of the LICENSE MAX SESSIONS initialization parameter |
| ORA-00020 | Maximum number of processes exceeded | The maximum number processes have exceeded | Reduce the number of processes at back end |
| ORA-00021 | Session attached to some other process; cannot switch session | The user session is currently used by others | Do not switch to a session attached to some other process |
| ORA-00022 | Invalid session ID; access denied | Either the session specified does not exist or the caller does not have the privilege to access it | 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 | An attempt was made to detach the current session when it contains references to process private memory | 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 |
Trying to login more than once from different processes for ORACLE started in single-process mode |
Logoff from the other process |
| ORA-00025 | Failed to allocate string | Out of memory | Restart with larger sga heap |