Archives of the TeradataForum

Message Posted: Mon, 05 Nov 2007 @ 15:39:34 GMT

	<Prev	Next>		<<First	<Prev	Next>	Last>>

<-- Anonymously Posted: Mon, 5 Nov 2007 10:36 -->

Hi All,

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?

	<Prev	Next>		<<First	<Prev	Next>	Last>>