Re: insert in batch loading

What does it mean that redo log size dominates checkpoint frequency? It brings to mind cases of Edmund Blackadder and Baldrick or Ace Rimmer and Lister & Kryten, both very clear cases of domination. I'm sure that J. Lewis, as a Britt, can tell you more about Black Adder and Red Dwarf, despite the fact that he missed those two subjects in his book. Redo logs of 100M are not really large. You, basically, have two choices: a) Increase redo logs to decent size (500M) b) Disable indexes during load.

The third choice (out of two) would be to use "_disable_logging" parameter, recently mentioned by Mr. Anjo Kolk. Now, that would be practical, don't you think?

On 11/25/2003 11:59:26 AM, David Boyd wrote:
> Janne,
>
> Thanks for your reply.
>
> We have 6 redo log switchings during inserting a table that has 1 million
> records. Our redo log size (100 MB) dominates the checkpoint frequency.
> The table has two indexes. We don't set them to unusable during inserting.
>
> David
>
>
> >From: Jan Korecki <Jan.Korecki_at_contactor.se>
> >Reply-To: ORACLE-L_at_fatcity.com
> >To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> >Subject: Re: insert in batch loading
> >Date: Tue, 25 Nov 2003 08:19:26 -0800
> >
> >David Boyd wrote:
> >
> >>Hi All,
> >>
> >>We have some batch loading jobs that truncate the tables first, then
> >>insert into the tables as select from tables through database link. Those
> >>jobs run daily. Every time when those jobs run, they cause "cannot
> >>allocate new log, Checkpoint not complete". All of tables and their
> >>indexes are in nologging mode. We have /*+append*/ hint in the insert
> >>statement. We have 5 redo groups with member of 100 MB. Some tables have
> >>more than 1 million records. I was wondering if any body knows a method
> >>that forces a commit after every 1000 records inserted, which is like
> >>delete_commit procedure.
> >>
> >>David
> >>
> >>_________________________________________________________________
> >>Groove on the latest from the hot new rock groups! Get downloads, videos,
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> >
> >
> >Hi!
> >If you do incremental commits the batch will run slower or not at all (ora
> >-01555).
> >
> >Have you checked how much redo your insert statement generates? You might
> >have missed something.
> >If you have indexes on the table you will have to set them unusable and
> >alter session set skip_unusable_indexes=true
> >Rebuild the indexes after the load with nologging.
> >
> >Janne!
> >
> >
> >--
> >Please see the official ORACLE-L FAQ: http://www.orafaq.net
> >--
> >Author: Jan Korecki
> > INET: Jan.Korecki_at_contactor.se
> >
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> Author: David Boyd
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Mladen Gogala
Oracle DBA

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