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Serious

Reported By: Ole Willy Tuv
Reported On: 6/18/2007
For: Version 1.04 Build 2

# 2381 Very Slow EXISTS Performance on Larger Tables

When investigating the EXISTS problem reported by Richard Harding in the NG,I noticed a severe performance problem with correlated subquery in the EXISTS predicate:

EDB 1.04 b2 : 100000 rows, 1545 seconds!
SQL Server 2005 : 0 rows, 3.2 seconds
NexusDB 2.07 : 0 rows, 5.8 seconds

select ID, SField1, Stamp
from ATable t1
where not exists
(
  select *
  from ATable t2
  where t2.ID = t1.ID
)

Resolution

Fixed Problem on 6/23/2007 in version 1.04 build 3

Products Affected

ElevateDB Additional Software and Utilities
ElevateDB VCL Client-Server
ElevateDB VCL Client-Server with Source
ElevateDB VCL Standard
ElevateDB VCL Standard with Source
ElevateDB VCL Trial

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