Successful database recovery relies on the database being backed. This is what enables the database to recover data that were lost due to a media failure, loss of power, or any other type of disaster. Each time the online line redoes logs filled up in a log group, the DBMS issues a log switch that will move the log writer process from the current redo log group to the next one in line. The archive background process begins archiving the data in the full online log group files to the archive log files. This is done simultaneously for each log file in the group. If media recovery is needed at the time that the database needs recovery, then the DBMS will search through the archived log files to find the ones that need to be used.
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