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Rushmore failing for most tags on one table
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17/01/2011 15:37:33
 
 
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General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Title:
Rushmore failing for most tags on one table
Environment versions
Visual FoxPro:
VFP 9 SP2
Miscellaneous
Thread ID:
01496382
Message ID:
01496382
Views:
150
Got a really weird one here. I have a table from a client app where Rushmore is not kicking in for most of the tags. The table has over 100 fields. (I didn't design this; I inherited it.) There are 19 tags; 10 of them are filtered. Obviously, I'm not expecting those to help with optimization.

When I test queries with SYS(3054), only one of the other 9 tags contributes to optimization. That tag corresponds to the table's effective primary key (it's a regular tag, but it's the PK field). When I run a query that filters on any of the others, I get optimization of "None".

I've rebuilt all the tags from scratch. I also tried adding a tag on a previously unindexed field and using that in a WHERE clause. No optimization.

I've tried this with two different copies of the table in different folders with the same results.

I made a copy of the table and started indexing one tag at a time and optimization worked as I expected. I thought maybe the problem was the presence of the filtered tags, so I added one of those, and optimization still worked as I expected for the other tags.

Anybody seen anything like this before?

Tamar
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