Oracle Database Errors or Warnings from Error ORA-12720 to ORA-12728

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ORA-12720: operation requires database is in EXCLUSIVE mode
Cause: This command can only be run when the database is in EXCLUSIVE mode
Action: Ensure that the system is in EXCLUSIVE mode
ORA-12721: operation cannot execute when other sessions are active
Cause: This command can only be run when there are no other sessions active
Action: Ensure there are no other connections to the database
ORA-12722: regular expression internal error
Cause: A regular expression internal error occurred.
Action: This is an internal error. Contact Oracle Support Services.

ORA-12723: regular expression too complex
Cause: The regular expression was too complex and could not be parsed.
Action: This is an internal error. Contact Oracle Support Services.
ORA-12724: regular expression corrupt
Cause: The regular expression contained an incorrect sequence of metacharacters.
Action: Ensure the metacharacters are correctly positioned.
ORA-12725: unmatched parentheses in regular expression
Cause: The regular expression did not have balanced parentheses.
Action: Ensure the parentheses are correctly balanced.

ORA-12726: unmatched bracket in regular expression
Cause: The regular expression did not have balanced brackets.
Action: Ensure the brackets are correctly balanced.
ORA-12727: invalid back reference in regular expression
Cause: A back references was found before a sub-expression.
Action: Ensure a valid sub-expression is being referenced.
ORA-12728: invalid range in regular expression
Cause: An invalid range was found in the regular expression.
Action: Ensure a valid range is being used.

Above are list of Oracle Database Errors or Warnings from Error ORA-12720 to ORA-12728 received while performing certain operation against Oracle Database or related products.

What are Oracle Database Error Messages?

Oracle Error Messages may be returned while using products which are part of Oracle Database.  Each Oracle Database Error or Warning Message mentioned above contains the Warning or Error Message Statement, a short explanation of the probable causes of the Error message, and a recommended action.

Hope this was helpful.

Thanks,
SQLServerF1 Team
Information about Oracle Database Error Messages or Warning Messages on Windows and Linux Operating Systems.

 

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