Answer / gouse

Oracle does not give the DBA a lot of control over redo
generation. If the instance crashes, then all the changes
within SGA will be lost. Oracle will then use the redo
entries in the online redo files to bring the database to a
consistent state. The cost of maintaining the redolog
records is an expensive operation involving latch management
operations (CPU) and frequent write access to the redolog
files (I/O). You can avoid redo logging for certain
operations using the NOLOGGING feature.

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