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Rushmore optimization - index composed of 2 fields
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From
07/01/2009 06:03:03
 
 
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General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Title:
Rushmore optimization - index composed of 2 fields
Environment versions
Visual FoxPro:
VFP 9 SP1
OS:
Windows XP SP2
Miscellaneous
Thread ID:
01371601
Message ID:
01371601
Views:
67
Hello,

I have a table with some fields including LNAME and FNAME (Lastname/Firstname).
One index on LNAME+FNAME

I want to make several requests :
- only lnames beginning with... (SELECT * FROM t1 WHERE LNAME="A")
- both lnames and fnames begining with..(SELECT * FROM t1 WHERE LNAME="A" AND FNAME="B")

Is it possible to have Rushmore optimized requests in both cases only with the index LNAME+FNAME ?

In general, in case of a request based on 2 fields (like the 2nd one), is it working with a unique index based on these 2 fields ?

In VFP9sp1, I'm wondering why I have to set ENGINEBEHAVIOR to 80 to have a working Rushmore optimization on a very simple request.
(CPCURRENT() is equal to CPDBF())

Thanks for your help.
Regards,
Steph
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