Re: Breaking down values in a large table

From: Arup Nanda <orarup_at_hotmail.com>
Date: Tue, 11 Feb 2003 07:29:26 -0800
Message-ID: <F001.00549481.20030211072926@fatcity.com>

John,

Why bother with the query; why don't you use the FILESIZE parameter of the export to break down the export files into manageable chunks?

Arup

>From: "John Hallas" <john.hallas_at_hcresources.co.uk>
>Reply-To: ORACLE-L_at_fatcity.com
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Subject: Breaking down values in a large table
>Date: Tue, 11 Feb 2003 06:19:09 -0800
>
>Listers,
>I have a table of 125M rows (not partitioned) which I am exporting. I
>want to break the export into 4 dmp files using the query command on the
>pk column.
>
>I am looking at how the best way of finding the values of the PK
>(number) which are at 25%, 50% and 75% ish for the table so that I can
>get 4 evenly sized exports
>
>My query line in the parameter file will be along the lines of where
>1) log_no < xx
>2) log_no >= xx and < yy
>3) log_no >= yy and < zz
>4) log_no >= zz
>
>I am thinking of a sql something like the following
>
>Select /*+ index ffs(table_name index_name) */
>Log_no , floor(log_no / 4), count(*)
>From table_name group by floor(log_no / 4), log_no
>
>Version is 8.1.7.1
>
>Can anybody help please
>
>Thanks
>
>John
>
>

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Author: Arup Nanda
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Received on Tue Feb 11 2003 - 09:29:26 CST