RE: Performance Question - High I/O per Insert

This is a follow-up to a question I posed earlier, but I have more info. A SQL*Loader conventional path load inserts rows into a table partitioned by week. On the first day of a new week, the load runs as efficiently as expected, but as the week goes on, the load goes more and more slowly. There is a single local index on each partition and the blevel is 2. I'm scratching my head. I realize I'm not providing much info, but can anyone tell me why loading into a partition might get slower as the partition fills? Thx!  

Mark Strickland  

From: Mark Strickland
Sent: Wednesday, September 22, 2004 12:42 PM To: oracle-l_at_freelists.org
Subject: Performance Question - High I/O per Insert  

I'm trying to understand why I'm seeing a high number of I/Os for inserts. Inserts are through SQL*Loader conventional patch. Average row length is 129 bytes, no longs or blobs. The table has five indexes and each index has a blevel of 2. According to v$sqlarea, each insert uses 650 logical I/Os, 69 physical I/Os. I would expect fewer than 20 I/Os per insert. There are db file sequential read waits on the data files that make up the index tablespace. That file system also contains the archived logs. Not surprised at the contention. Can someone point me in the right direction to understand this? Thx.  

Mark Strickland

Drugstore.com

Seattle, WA

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