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Speeding up search - Locate For or Seek?
Message
From
27/07/2000 13:59:10
Walter Meester
HoogkarspelNetherlands
 
General information
Forum:
Visual FoxPro
Category:
Coding, syntax & commands
Miscellaneous
Thread ID:
00397065
Message ID:
00397753
Views:
31
Hi George,

Your tests may be unreliable because the physical record location of the GREIGE_NO = '439D' might affect your results. If you would use random values to test on, you might get more reliable results.

Walter,

>>Hey George, I've tried to duplicate your results, but I cannot. With the tag set I'm getting 36 seconds and without it I get .29 seconds. This has always been my experience. There was even a time when it was recommended that you SET ORDER TO 0 before running an SQL, but that's not necessary anymore. Here's how I created my table and how I tested the performance ... I hope I got the UT code formating stuff right.
>
>
>You got me, I have no idea. Here's mine
>SET ORDER TO TAG GREIGE_NO
>lnstart = SECONDS()
>FOR lni = 1 TO 10000
>  SEEK '439D'
>NEXT
>lnstop = SECONDS() && less than 0.2 seconds
>GO TOP
>? lnstop - lnstart
>SET ORDER TO
>lnstart = SECONDS()
>FOR lni = 1 TO 10000
>  LOCATE FOR GREIGE_NO = '439D'
>NEXT
>lnstop = SECONDS()
>? lnstop - lnstart && approx. 6.15 seconds
>GO TOP
>SET ORDER TO TAG GREIGE_NO
>lnstart = SECONDS()
>FOR lni = 1 TO 10000
>  LOCATE FOR GREIGE_NO = '439D'
>NEXT
>lnstop = SECONDS()
>? lnstop - lnstart && approx. 2.2 seconds
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