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Message Posted: Wed, 09 Mar 2005 @ 20:27:48 GMT


     
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Subj:   Use of Indexes in Teradata
 
From:   Srikanth Goli

Does Teradata use indexes if only leading index columns are specified? For exampls, assume a sales table that has Unique Primary Index on SaleDate, StoreID, and Trand_ID and that is large, over a bollion rows. Now one of my queries needs to delete all the data for a specific SaleDate. Does the delete still use the index or is it a table scan? If it is a table scan, then should I have a secondary non-unique index on the SaleDate?Would the sec. index be used? What are my other options?


Thanks in advance..



     
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