ORA-01126: database must be mounted in this instance and not open in any instance

Oracle error

ORA-01126: database must be mounted in this instance and not open in any instance

Cause: Obvious

Action: None

See more oracle error here.

ORA-01125: cannot disable media recovery - file string has online backup set

Oracle error

ORA-01125: cannot disable media recovery - file string has online backup set

Cause: An attempt to disable media recovery found that an online backup is still in progress.

Action: End the backup of the offending tablespace and retry this command.

See more oracle error here.

Oracle error- ORA-00837: Specified value of MEMORY_TARGET greater than MEMORY_MAX_TARGET

Oracle error

ORA-00837: Specified value of MEMORY_TARGET greater than MEMORY_MAX_TARGET

Cause: The specified value of MEMORY_TARGET was greater than MEMORY_MAX_TARGET.

Action: Set MEMORY_TARGET less than or equal to MEMORY_MAX_TARGET.

See more oracle error here.