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Donald K. Burleson

Oracle Tips  

Oracle Export Files

Export files affect the recoverability of your database should some disaster befall it. Export files, created by the export utility supplied by Oracle, are copies of a database’s data and structure at a given point in time. Export files are logical copies of the database, not physical copies. Several types of exports will be covered in Chapter 15. Export files should be stored in a separate location from archive files.

Oracle Archive Log files

Archive logs, as stated previously, are archived copies of the redo logs. They provide the capability to recover to a specific point in time for any tablespace in the database. For any application considered to be production- or mission-critical, archive logging must be turned on. These files can be stored to disk, tape, or even optical storage such as WORM (write once, read many). Using operating system backups such as COPY on NT or W2K, or TAR on UNIX, and with the application of archive logs, a database can be recovered quickly after disaster. Archive logs can only be used to recover when cold or hot backups are used for Oracle backup. Archive logs cannot be applied to a recovery using exports files.

After each successful hot or cold backup of an Oracle database, the associated archive and backup files may be removed and either placed in storage or deleted. In an active database archive, logs may average tens of megabytes or gigabytes per day. Clearly, storage for this amount of data needs to be planned for; for example, at one installation doing Oracle development with no active production databases, gigabytes of archives and a like amount of exports were generated in a one-week period. If archive logging is turned on and you run out of archive disk space, the database stops after the last redo log is filled. Plan ahead and monitor disk usage for instances using archive logging.

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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