not FIELD3 COULD BE NULL, VARIABLE :F3 AND THAT MEANS NO FILTER ON FIELD3
thanks
From: "[email protected] [firebird-support]"
<[email protected]>
To: [email protected]
Sent: Wednesday, August 19, 2015 8:00 PM
Subject: Re: [firebird-support] Re: MAKE 'EXECUTE STATEMENT' USE INDEX
Hi, i do not know what should happen in your case when FIEL3 is null?But
you can try WHERE FIEL1=:F1 AND FIEL2=:F2 AND (FIEL3=COALESCE(:F3, FIEL3) )
INTO .. DO .. regards,Karol Bieniaszewski From:
mailto:[email protected] Sent: Wednesday, August 19, 2015 1:29
PMTo: [email protected] Subject: Re: [firebird-support] Re: MAKE
'EXECUTE STATEMENT' USE INDEX ok,thanks
This time,adding condition this way WHERE FIEL1=:F1 AND FIEL2=:F2 AND
(FIEL3=:F3 OR :F3 IS NULL) INTO .. DO ..
is causing query to be much slower ...
this WHERE FIEL1=:F1 AND FIEL2=:F2 AND (FIEL3=:F3
& nbsp; ) INTO .. DO ..takes 0.563s
82655 fetches, 1088 marks, 1584 reads, 50 writes.
197 inserts, 98 updates, 148 deletes, 19166 index, 66 seq.Delta memory: 11536
bytes.Total execution time: 0.563s
but this takes&nbs p;29.141sWHERE FIEL1=:F1 AND FIEL2=:F2 AND (FIEL3=:F3 OR
:F3 IS NULL) INTO .. DO ..
1700290 fetches, 1065 marks, 3694 reads, 77 w rites.198 inserts, 99 updates,
149 deletes, 29422 index, 68 seq.Delta memory: -71656 bytes.Total execution
time: 29.141sScript execution finished.
in both cases :F3 is NOT NULL thanks
From: "Dmitry Yemanov [email protected] [firebird-support]"
<[email protected]>
To: [email protected]
Sent: Wednesday, August 19, 2015 11:51 AM
Subject: [firebird-support] Re: MAKE 'EXECUTE STATEMENT' USE INDEX
19.08.2015 10:26, 'Mr. John' wrote:
> now index is used if I call
> SELECT * FROM MYPROC(...)
> but I use it in other procedures,no join on it just simply SELECT ..
> FROM MYPROC(...) in this case I can see in the plan :
> ...(MYPROC NATURAL)...
That' OK. In complex plans, (MY_PROC NATURAL) just means a select from a
procedure, it says nothing about actual plans inside MY_PROC.
Dmitry
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