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Minor Minor
Reported By: Antonio Polito
Reported On: 1/24/2016
For: Version 2.21 Build 1
# 4358 Query Optimizer Incorrectly Relying on Index Scan that has High I/O Cost for File-Sharing Access

The following SQL on edb 2.11 b3 time to exeute 1.76 s, while on edb 2.21 b1 time to exeute 9.76 s.

SELECT * FROM MOVIMENTI
WHERE  DATAMOV >= DATE '2015-01-27' AND
(CODICECFM ='013299' OR CODICEFISCALE ='SSTSAI09L42G039V') AND
(CAUSALE ='201' OR CAUSALE = '204')       



Comments Comments
This issue was really only a problem with local sessions directly accessing large tables on a network share. The problem was that one of the index scans resulted in ~20MB of index page reads, which with local/server access is normally not an issue.


Resolution Resolution
Fixed Problem on 1/30/2016 in version 2.22 build 1


Products Affected Products Affected
ElevateDB Additional Software and Utilities
ElevateDB DAC Client-Server
ElevateDB DAC Client-Server with Source
ElevateDB DAC Standard
ElevateDB DAC Standard with Source
ElevateDB DAC Trial
ElevateDB LCL Standard with Source
ElevateDB PHP Standard
ElevateDB PHP Standard with Source
ElevateDB PHP Trial
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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