Oracle-L: RE: Phew ... Finally Migrated

From: Deshpande, Kirti <kirti.deshpande_at_verizon.com>
Date: Mon, 14 Oct 2002 09:28:33 -0800
Message-ID: <F001.004E82EA.20021014092833@fatcity.com>

Raj,
Thanks for sharing this.
When COMMIT=y, and if the table has columns with LONG datatype (among a few others), IMP will not use array inserts (BUFFER=) and will commit each row. Committing each row for large tables with these datatypes adversely affects import times.
In such cases, setting COMMIT=n and using a large value for BUFFER will speed up import, but one must also have large enough rollback/undo tablespace.

Kirti

-----Original Message-----
Sent: Monday, October 14, 2002 10:24 AM
To: Multiple recipients of list ORACLE-L

Over the weekend we migrated all our production systems on 9201 on AIX.

I know it is not all that important, but thought I'd let everyone know. I also learned the magic of commit=y/n setting on imp. I have one table (it had a long column) that was taking 6600 seconds to import with commit=y. After looking up Metalink, I changes the commit=y to commit=n, the same import finishes in 1010 seconds.

I have 14G of undo tablespace, so I changed commit=n for import on all tables with long columns ... the time for import was reduced dramatically.

Raj

Rajendra Jamadagni MIS, ESPN Inc. Rajendra dot Jamadagni at ESPN dot com
Any opinion expressed here is personal and doesn't reflect that of ESPN Inc.

QOTD: Any clod can have facts, but having an opinion is an art!

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Author: Deshpande, Kirti
INET: kirti.deshpande_at_verizon.com

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