Performance tuning

From: <azhar_at_mathtech-pk.com>
Date: Wed, 30 May 2001 02:49:22 -0700
Message-ID: <F001.0031329F.20010530011925@fatcity.com>

HI ALL,
We have to load almost 3 millions records of average row size of 150 bytes. We are importing data using sqloader with ROWS=4000 and bindsize=8450000 . We have adjusted the rollback segment to almost 10 m with 8 extents enough for single transaction size and considering 30% rollback overhead. We adjusted the OPTIMAL TO 10 M to have avoid rollback extension Rollback segment, databuffer cache have hit ratio of 100%.

The loading was fast only for first 10 commits but then it slowed like snail. LOADING TOOK 22 hours in the first run on ORACLE8i NT4 128 megs RAM .
SGA figures in M :

NAME                     VALUE
-------------------- ---------
Fixed Size            .0676384
Variable Size        239.02734
Database Buffers       39.0625
Redo Buffers         7.8203125
                     ---------
sum                  285.97779

( we can't use direct path due to functions in sqlldr controlfile). . Couldn't figure out the bottleneck yet.
Any ideas.
TIA
Azhar Siddiq,
DBA
LMK Resources

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INET: azhar_at_mathtech-pk.com

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