RE: speeding up expdp
Date: Sat, 5 May 2012 07:51:11 +0200
Is your database an enterprise edition or a standard edition?
If you have an enterprise edition, then expdp can work with multiple parallel slaves. One thing you then need to look for is if the 2 large tables are also exported in parallel or if only 1 process is exporting them. If the table for instance has a lob column, then oracle can't export it in parallel. Sometimes Oracle chooses for some reason wrongfully the direct path method for a table, which disables the parallel feature. In that case you can try to force expdp to use the external table method.
The notes below give you a good starting point on how to improve the performance of datapump and how to check what is happening:
Checklist for Slow Performance of Export Data Pump (expdp) and Import DataPump (impdp) [ID 453895.1] Export/Import DataPump Parameter TRACE - How to Diagnose Oracle Data Pump [ID 286496.1] Export/Import DataPump Parameter ACCESS_METHOD - How to Enforce a Method of Loading and Unloading Data ? [ID 552424.1]
Oracle Database Administrator
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From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Maureen English Sent: zaterdag 5 mei 2012 3:58
Subject: speeding up expdp
We have an Oracle 10g database on RHEL5. I would love to find a way
to speed up the export
of the database. It currently takes about 7.5 hours. The main problem is with 2 tables, one of
which is 30GB, the other is 70GB.
I've looked through the documentation for expdp, as well as gone
through all of the Metalink notes
I could find that were related to expdp running slowly. I've tweaked things here and there, but I
can't get the export to run any faster. I know the system is a little slow, and I'm writing to an
NFS mounted drive, but I was really hoping that this could be done faster. I haven't tried using
exp instead, but I'm considering that for another test.
http://www.freelists.org/webpage/oracle-l Received on Sat May 05 2012 - 00:51:11 CDT