Common Oracle Errors And Their Solutions

Oracle is used widely now days for database manipulation purposes. While using oracle we face lot of problems. A different kind of problems may arise while using oracle. Among these wide range or problems and errors some of the common oracle errors and their solutions are listed below:

ORA-00000 – ORA-01999
ORA-02000 – ORA-03999
ORA-04000 – ORA-05999
ORA-06000 – ORA-07999
ORA-08000 – ORA-11999
ORA-12000 – ORA-13999
ORA-14000 – ORA-23999
ORA-24000 – ORA-25999
ORA-26000 – ORA-27999
ORA-28000 – ORA-30100

ORA-00000 Indicates normal and successful operation completion
Cause: The operation has been completed successfully and no exceptions occur.
Action: No action required as operation is successful.

ORA-00001 Violation of the unique constraint
Cause: Duplicate key insertion by update or insert statement.
Action: Don’t insert the key or remove the unique restriction.
ORA-00018 Maximum session limit exceeded
Cause: All the objects of the session state are in use.
Action: Just increase the value of the SESSIONS.
ORA-00020 Maximum number of process exceeded
Cause: Because all process state objects are in use and no new are available.
Action: Just increase the number of processes initialization parameter.

ORA-00021 Can’t switch session as session is attached to some other process
Cause: Other users are using the same session currently.
Action: Don’t switch or use the session attached to others.
ORA-00024 Single mode process doesn’t permits the login from more than one process
Cause: Log in attempt was made in more than one different processes for oracle started in single process mode.
Action: Immediately log off from the other running process.

ORA-00025 String allocation failed
Cause: Application failure because Oracle ran short of memory.
Action: Just restart Oracle application.

ORA-00026 Invalid or missing session ID
Cause: The ID string specified in the ALTER SYSTEM KILL SESSION command was invalid for the session, or there was no string present.
Action: Again try the command with a new valid session ID.

ORA-00027 Current session cannot be killed
Cause: It was attempted to ALTER SYSTEM KILL SESSION for killing the current session.
Action: Kill the current session from another session.

ORA-00028 The session has been killed
Cause: A user is logged off and user has killed the session.
Action: Consult the database administrator. An attempt may be made to perform any operation that requires the user to be logged out.
ORA-00029 Current session is not a user session
Cause: It is not a user session as session ID specified in an ALTER SYSTEM KILL SESSION command was not a user session.
Action: Try again with a valid session ID.

ORA-00030 User session ID is no longer be available
Cause: Session was logged out that’s why the user session ID no longer exists
Action: Provide a valid session ID.