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Donald K. Burleson

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Oracle Number and Placement of Redo Logs? 

You have to balance the needs for restoration and minimal data loss against time to recover data. Obviously, if you have archiving happening every minute and your normal workday is eight hours, you will have 480 logs written to disk daily. Over a five-day workweek, this turns into 2,400 files. If you have to restore from a crash or other disaster, you may have to apply all of these to your last backup to bring the database current to the time of the crash. In one case, a DBA had to apply 9,000-plus files to recover his system because he hadn’t looked at how often his redo logs were archiving. Needless to say, he pays more attention now. The minimum size for redo log groups is 50 KB. By default the Oracle DBCA creates 100 megabyte redo log

In Chapter 12 on database tuning, we will discuss how to determine if you have a sufficient number of redo log groups and how to optimize your archive process.


This is an excerpt by Mike Ault’s book “Oracle Administration & Management”.  If you want more current Oracle tips by Mike Ault, check out his new book “Mike Ault’s Oracle Internals Monitoring & Tuning Scripts” or Ault’s Oracle Scripts Download.

 

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