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Message Posted: Thu, 25 Apr 2002 @ 16:05:12 GMT


     
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Subj:   Group-AMPs Retrieve
 
From:   Anomy Anom

<-- Anonymously Posted: Thursday, April 25, 2002 11:53 -->

Can anyone explain what group-AMPs RETRIEVE means in step 5 of this explain? In my select statement, I am selecting my the primary index but I have an OR clause on field SPL_EXT_NO, which would explain steps 2 & 3.

Thanks.


Explanation
--------------------------------------------------
 
  1)First, we lock corpdbp1.CIRCUIT3T for access.  
  2)Next, we do a single-AMP RETRIEVE step from corpdbp1.CIRCUIT3T by way of the primary index "corpdbp1.CIRCUIT3T.SPL_MODIFIER = '1 ', corpdbp1.CIRCUIT3T.SPL_PREFIX = '1 ' , corpdbp1.CIRCUIT3T.SPL_CO_ASGN = 'ATI ', corpdbp1.CIRCUIT3T.SPL_SER_NO = 1 , corpdbp1.CIRCUIT3T.SPL_SUFFIX = '1 ', corpdbp1.CIRCUIT3T.SPL_SVC_CODE = 'DH' , corpdbp1.CIRCUIT3T.SPL_CENT_OFF = NULL, corpdbp1.CIRCUIT3T.SPL_EXT_NO = ' ' , corpdbp1.CIRCUIT3T.SPL_LINE_NO = NULL, corpdbp1.CIRCUIT3T.SPL_NPA = NULL" extracting row ids only with no residual conditions into Spool 2, which is built locally on that AMP. The size of Spool 2 is estimated to be 15 rows. The estimated time for this step is 0.03 seconds.  
  3)We do a single-AMP RETRIEVE step from corpdbp1.CIRCUIT3T by way of the primary index "corpdbp1.CIRCUIT3T.SPL_MODIFIER = '1 ', corpdbp1.CIRCUIT3T.SPL_PREFIX = '1 ' , corpdbp1.CIRCUIT3T.SPL_CO_ASGN = 'ATI ', corpdbp1.CIRCUIT3T.SPL_SER_NO = 1 , corpdbp1.CIRCUIT3T.SPL_SUFFIX = '1 ', corpdbp1.CIRCUIT3T.SPL_SVC_CODE = 'DH' , corpdbp1.CIRCUIT3T.SPL_CENT_OFF = NULL, corpdbp1.CIRCUIT3T.SPL_EXT_NO = NULL , corpdbp1.CIRCUIT3T.SPL_LINE_NO = NULL, corpdbp1.CIRCUIT3T.SPL_NPA = NULL" extracting row ids only with no residual conditions into Spool 2, which is built locally on that AMP. The size of Spool 2 is estimated to be 30 rows. The estimated time for this step is 0.03 seconds.  
  4)We do a SORT to order Spool 2 by row id eliminating duplicate rows. The estimated time for this step is 0.00 seconds.  
  5)We do a group-AMPs RETRIEVE step from corpdbp1.CIRCUIT3T by way of row ids from Spool 2 (Last Use) with a residual condition of ("(corpdbp1.CIRCUIT3T.SPL_NPA IS NULL) AND ((corpdbp1.CIRCUIT3T.SPL_LINE_NO IS NULL) AND (((corpdbp1.CIRCUIT3T.SPL_EXT_NO IS NULL) OR (corpdbp1.CIRCUIT3T.SPL_EXT_NO = ' ')) AND ((corpdbp1.CIRCUIT3T.SPL_CENT_OFF IS NULL) AND ((corpdbp1.CIRCUIT3T.SPL_CO_ASGN = 'ATI ') AND ((corpdbp1.CIRCUIT3T.SPL_SUFFIX = '1 ') AND ((corpdbp1.CIRCUIT3T.SPL_SER_NO = 1) AND ((corpdbp1.CIRCUIT3T.SPL_MODIFIER = ' 1 ') AND ((corpdbp1.CIRCUIT3T.SPL_SVC_CODE = 'DH') AND (corpdbp1.CIRCUIT3'1')))))))))") into Spool 1, which is built locally on the AMPs. The size of Spool 1 is estimated with low confidence to be 30 rows. The estimated time for this step is 0.28 seconds.  
  6)Finally, we send out an END TRANSACTION step to all AMPs involved in processing the request.  
  ->The contents of Spool 1 are sent back to the user as the result of statement 1. The total estimated time is 0.34 seconds.  



     
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