If you encounter the ORA-01307 error in Oracle, it means that there is no active LogMiner session. This error can occur for a variety of reasons, including incorrect configuration, insufficient privileges, or issues with the LogMiner process itself. In this blog post, we will discuss how to diagnose and fix the ORA-01307 error, covering all possible scenarios.
Diagnosing the ORA-01307 error
Before attempting to fix the ORA-01307 error, it’s important to diagnose the root cause of the issue. Here are some steps to help you identify the source of the problem:
1. Check LogMiner configuration: Ensure that LogMiner is properly configured and enabled for the database. You can use the following SQL query to check the status of LogMiner:
SELECT SUPPLEMENTAL_LOG_DATA_MIN FROM V$DATABASE;
If the query returns ‘YES’, then LogMiner is enabled. If it returns ‘NO’, you will need to enable LogMiner using the following command:
ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;
2. Verify user privileges: Make sure that the user attempting to use LogMiner has the necessary privileges. The user must have the SELECT_CATALOG_ROLE and LOGMINER_ROLE roles granted to them.
3. Check LogMiner session status: Use the following query to check if there are any active LogMiner sessions:
SELECT * FROM V$LOGMNR_SESSION;
If the query returns no rows, it means that there are no active LogMiner sessions.
Fixing the ORA-01307 error
Once you have diagnosed the issue, you can take the appropriate steps to fix the ORA-01307 error. Here are some possible solutions:
1. Enable LogMiner: If LogMiner is not enabled, you can enable it using the ALTER DATABASE ADD SUPPLEMENTAL LOG DATA command, as mentioned earlier.
2. Grant necessary privileges: If the user does not have the required privileges, you can grant them using the following commands:
GRANT SELECT_CATALOG_ROLE TO <username>; GRANT LOGMINER_ROLE TO </username><username>;
3. Start a LogMiner session: If there are no active LogMiner sessions, you can start a new session using the DBMS_LOGMNR.START_LOGMNR procedure:
EXECUTE DBMS_LOGMNR.START_LOGMNR(STARTTIME => SYSTIMESTAMP, ENDTIME => SYSTIMESTAMP, OPTIONS => DBMS_LOGMNR.DICT_FROM_ONLINE_CATALOG);
By following these steps, you should be able to diagnose and fix the ORA-01307 error in Oracle. If you continue to encounter issues, consider reaching out to Oracle support for further assistance.
