Re: Breaking down values in a large table

[Arup Nanda]

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" <[EMAIL PROTECTED]>
Reply-To: [EMAIL PROTECTED]
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
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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