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Monitoring Redo Activity with V$ and DBA_ Views 

The redo logs provide the information required to redo transactions performed on the database. For an Oracle8, Oracle8i, or Oracle9i database, redo logs are placed in log groups whose members consist of individual log files. For Oracle8, Oracle8i, or Oracle9i, there should be at least two mirrored groups of log files on separate drives to start up; three are highly recommended. In high-activity environments, the use of five mirrored groups of 5 megabytes each will ensure that there is no log contention. Sizing redo logs and number required is not an exact science; it must be done by trial and error. Monitor the alert log for waits on log switches or checkpoints to see if your logs are large enough or if you have enough of them.

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