Re: Import/Export performance

From: Raj Sakthi <rajan_sakthi_at_yahoo.com>
Date: Fri, 20 Apr 2001 14:28:12 -0700
Message-ID: <F001.002EE568.20010420143114@fatcity.com>

Hi RF ,
export is Fairly straight forward .
1.Use direct export
2.Use parallel export processes . Run your biggest table export first and fire off other exports simultaneously . Take a look at parallel download script at
http://www.oriole.com/frameindexTK.html

Now import is another kind of beast .
Import :

SERVER SIDE
1.Increase SGA as much as possible with out paging and if possible lock it in physical memory .

2. Create Large redo log files > or = 3
3. No archivelog mode 
4.Depending on number of parallel Exp/Imp process ,

create the same number of large rollback segs and bring them on line ( keep other normal ones offline ) 5.Precreate empty objects . Make all tablespace nologging and all tables nologging .

6. Disable all FK and PKs
7. Drop all indexes if you have already created them .
8. drop all triggers .
9. Finally ( I hope..!! ) run import with commit=N.

Remember to fix all this when import is over . Hope this helps .
Regards,
RS

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Author: Raj Sakthi
INET: rajan_sakthi_at_yahoo.com

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