Re: why so many log switches?

This depends on the methods you are using to load the data. It does seem excessive even for a simple row at a time loop - which probably shouldn't use more that about 100MB according to the volumes and indexes you've quoted. But it could be the result of a direct path load that rebuilds indexes, or a clunky generated routine that does one insert and multiple updates to populate a row.

Would you care to explain how the data gets into the table, and what proportion of the new rows are likely to have non-null values that would affect the indexes.

Regards

Jonathan Lewis
http://www.jlcomp.demon.co.uk

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-----Original Message-----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: 30 January 2003 20:34

>I have a table with 40 million rows. Daily I load about 70,000
records into
>it. Each record is 128 characters wide. The flat file the data comes
in is
>9 megs. My redo logs are 20 megs each and I have 3 groups of them.
>
>When I load the data, the alert log shows 29 log switches which
generates a
>lot of archives logs. Why am I getting so many log switches? I would
think
>that if the OS file is 9 megs and the redo logs are 20, I would at
most get
>1 log switch.
>
>Thanks,
>Randy
>--

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Author: Jonathan Lewis
  INET: jonathan_at_jlcomp.demon.co.uk

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