Types of Log File

Three types of log file may appear in a database's clean log sub-directory:

Clean Log	Used to log committed transactions and independent updates applied to the database. It stores their 'After' images and transaction boundary images. A clean log is created when Transaction Logging is started or switched.
Reject log (TL-REJECT)	Used to log 'After' images which cannot be applied to the database by a clean log restore. The TL-REJECT log is created automatically when a clean log is restored.
Error Log (TL-ERRORS)	Used to log failed images when problems occur in processing images while aborting a transaction, or while handling images in the raw log after rebooting due to a system failure. This file will normally be empty.