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What is meant by Redo Log file mirrorring ? How it can be

What is meant by Redo Log file mirrorring ? How it can be achieved?..

Answer / orawhiz

Process of having a copy of redo log files is called mirroring.

This can be achieved by creating group of log files
together, so that LGWR will automatically writes them to
all the members of the current on-line redo log group. If
any one group fails then database automatically switch over
to next group. It degrades performance

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