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Message Posted: Mon, 05 Nov 2007 @ 15:39:34 GMT
<-- Anonymously Posted: Mon, 5 Nov 2007 10:36 -->
I am inserting and deletiing certain rows in a table using Multload. Since the table data is highly skewed the Mload delete step is taking more than 9 hrs to complete.
My target table has non-unique pirmary index. It is not possible to change the PI of the table. Though I noticed that if I change the PI from 2 to 3 columns the table becomes failry distributed on all the amps using the query
*Select * hashamp(hashbucket(hashrow( NAME, ORIGIN, HO_NO))) ,*Count*(*) *From * MCKSG03_RESP *Group By* 1;
So if change the PI from (NAME, ORIGIN) to (NAME, ORIGIN, HO_NO) the distribution of the rows is fairly even.
But I cannot change the PI of the table.
If I define a non-unique secondary index on (NAME, ORIGIN, HO_NO) will my mload performance improve.
Is there any other way I can improve the performane of my Mload?
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