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Message Posted: Thu, 25 Sep 2014 @ 15:51:08 GMT


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Subj:		Re: Efficient Delete in Teradata

From:		Bakthavachalam, Roopalini

Roopalini Bakthavachalam wrote:

What is the most efficient way to delete (say < 50,000) records from a table which has 1.5 billion records? Here is the query and data demographics. The PPI in TABLE1 is not being used due to the condition T1.DATE_CLOUMN1 > T2.DATE_COLUMN2.

          > DELETE T1
          > FROM TABLE1 T1,
          > TABLE2 T2,
          >                 TABLE3 T3
          > WHERE T1.COLUMN1= T2.COLUMN1
          > AND T1.COLUMN1= T3.COLUMN1
          > AND T1.DATE_CLOUMN1 > T2.DATE_COLUMN2
          > AND T2.COLUMN3 ='ABC'
          >
          >
          > T1.COLUMN1 IS INTEGER and part of the UPI in TABLE1
          > T1.DATE_COLUMN1 is DATE and PPI of TABLE1
          > T2.COLUMN1 is INTEGER and not part of any index in TABLE2
          > T2.DATE_COLUMN2 is DATE and not part of any index in TABLE2
          > T3.COLUMN1 is INTEGER and part of UPI in TABLE3
          >
          >
          > Record count
          >
          > TABLE1 - 1.5 Billion
          > TABLE2 - 93
          > TABLE3 - 97

Forum - Any response for this? I still have not figured out this.

Thanks

Roopalini


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