Re: Paralellizing Pl/sql inserts

From: Prasad <>
Date: Tue, 22 Jan 2008 16:13:46 -0800
Message-ID: <>

Have you tried BULK insert .

On Jan 22, 2008 4:03 PM, Ken Naim <> wrote:

> I have a process that is currently running at a rate of 4 million inserts
> per hour. In selects from a cursor that returns 65 million records bulk
> collects 500 at a time and forall inserts them into another table with 1.5
> billion rows. I cannot do an insert as select as the record may already
> exists. I use the save exceptions clause to allow the code to continue
> processing but I don't care about which record turn the unique constraint
> violation. The 1.2 billion row table is partitioned but the data can go
> into
> any partition. The 65 million row table is not partitioned
> On smaller tables I would do a minus between the primary keys of both
> tables
> and use that as a filter on an insert as select.
> The 65 million record cursor takes only 15 minutes to return all 65
> million
> records, so 98.5% of the time is consumed by the inserts. I am going to
> move
> the table to non assm tablespace and increase its free lists but I believe
> these measures will only provide a marginal improvement. 33% of the
> elapsed
> time is waiting on cpu and the top wait events are db file sequential read
> (94%) and db file scattered read (6%)
> The business requires this process to run in under 2 hours as it will run
> weekly (if not daily) so I need an order of magnitude increase in
> performance. The infrastructure (server/storage array etc.) is high end
> and
> shows little load during this process and this process will be the only
> one
> running on the box at that time.
> I am open to any suggestions but my question is how can I parallelize the
> process into multiple (24-48) threads.
> Thanks,
> Ken
> --

Received on Tue Jan 22 2008 - 18:13:46 CST

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