Oracle Error Message
ORA-55510: Mining could not start
Reason for the Error
Mining could not start for the following reasons.
1. A logminer session was processing
2. The database was not mounted or not opened for read and write
3. Minimum supplemental logging was not enabled
4. Archiving was not enabled
Solution
Fix the mentioned problems and try again. Note that if you enable supplemental logging now, you will not be able to remove a transaction that has committed without supplemental logging.