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Donald K. Burleson

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Oracle Developmental Responsibilities

* Names of the database and redo log files
* Timestamp of database creation
* Begin/end of rollback segments
* Checkpoint information
* Current redo log file sequence number

This data is critical for database operation, and at least one control file is required for database startup. There are methods for rebuilding a control file, but it is much easier to maintain--or rather have Oracle maintain--multiple copies of the control file.

Oracle recommends two copies on separate disk resources. For OFA compliance, three are required. Obviously, if they are on the same platter or are placed in the same stripe set, the same disaster can waste all of them; therefore, they should be placed on different physical disk arrays if possible. More than three copies is a bit paranoid, but if it makes you feel safer, have as many as you wish; only one usable, current file is required for startup.

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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