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Import of database dump takes 13 hours

Phillip Bracken EXPERT RESPONSE FROM: Phillip Bracken

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QUESTION POSED ON: 11 June 2007
I tried to import a database dump onto my Oracle server using the imp script. The import process currently takes 13 hours to import a 3 GB dump file. Any ideas will greatly help.

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EXPERT RESPONSE
Here are are some suggestions.
  1. Check the database alert log. If you see messages like Checkpoint Incomplete, or if log files are switching frequently, then you need to increase the size and number of redo log files.
  2. Set or increase the size of the BUFFER parameter on your import. This will increase the size of the buffer that Oracle uses to do the bulk inserts.
  3. If possible, create a large UNDO tablespace, and switch to that large UNDO tablespace by using the alter system undo_tablespace=Large_Undo before the import. Then, run the IMP with the COMMIT=N option. After the import completes, switch back to the old UNDO tablespace and then drop the large one if it is no longer necessary. If you do not have the enough space for a larger redo then try increasing the COMMIT parameter setting on the IMP command.
  4. Increase the SORT_AREA_SIZE parameter. Increasing this parameter will provide more space for sorting operations when creating indexes.
  5. Increase the LOG_CHECKPOINT_INTERVAL. This will help to reduce the number of checkpoints.


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