If you are encountering the ORA-00490 error in Oracle, it means that you have specified the LOGFILE clause more than once in your SQL statement. This can occur when you are trying to create or alter a database, and it can cause the operation to fail. In this article, we will discuss how to diagnose and fix this error.
Diagnosing the ORA-00490 error
When you encounter the ORA-00490 error, Oracle will provide you with a message that looks something like this:
ORA-00490: LOGFILE clause specified more than once
This error message clearly indicates that the LOGFILE clause has been specified multiple times in your SQL statement. To diagnose the error, you will need to review your SQL code to identify the duplicate LOGFILE clause.
Fixing the ORA-00490 error
To fix the ORA-00490 error, you will need to remove or correct the duplicate LOGFILE clause in your SQL statement. Here are a few possible scenarios and their corresponding solutions:
Scenario 1: Creating a new database
If you are creating a new database and encounter the ORA-00490 error, it is likely that you have specified the LOGFILE clause multiple times in your CREATE DATABASE statement. To fix this, review your SQL code and remove any duplicate LOGFILE clauses.
CREATE DATABASE testdb
LOGFILE GROUP 1 ('/u01/app/oracle/oradata/testdb/redo01.log') SIZE 100M,
GROUP 1 ('/u01/app/oracle/oradata/testdb/redo02.log') SIZE 100M;
In this example, the LOGFILE GROUP 1 clause is specified twice. To fix the error, simply remove the duplicate clause:
CREATE DATABASE testdb
LOGFILE GROUP 1 ('/u01/app/oracle/oradata/testdb/redo01.log') SIZE 100M;
Scenario 2: Altering a database
If you are altering an existing database and encounter the ORA-00490 error, it is likely that you have specified the LOGFILE clause multiple times in your ALTER DATABASE statement. To fix this, review your SQL code and remove any duplicate LOGFILE clauses.
ALTER DATABASE testdb
ADD LOGFILE GROUP 2 ('/u01/app/oracle/oradata/testdb/redo03.log') SIZE 100M,
GROUP 2 ('/u01/app/oracle/oradata/testdb/redo04.log') SIZE 100M;
In this example, the LOGFILE GROUP 2 clause is specified twice. To fix the error, simply remove the duplicate clause:
ALTER DATABASE testdb
ADD LOGFILE GROUP 2 ('/u01/app/oracle/oradata/testdb/redo03.log') SIZE 100M;
Conclusion
In conclusion, the ORA-00490 error in Oracle indicates that the LOGFILE clause has been specified more than once in your SQL statement. To fix this error, you will need to review your SQL code and remove any duplicate LOGFILE clauses. By following the steps outlined in this article, you should be able to diagnose and fix the ORA-00490 error in Oracle.
