ASA6 force index usage

I have Adaptive Server Anywhere version 6.
I have discovered in ISQL that, with the very same SQL statement, the engine doe not always choose the same index to retrieve the records. There must me some smart mechanism that tries to find out what the optimal index will be.
Sometimes I do not agree with the index chosen, so i would like to know I there is a way to force a specific index.
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On the assumption that ASA is similar to ASE ...

this is the format for ASE:
FROM yourtable (INDEX yourindexname)
WHERE ....
jvvAuthor Commented:
I tried it in ISQL.
The syntax is accepted, but the index clause is ignored.....:-((
sorry ... can't help with ASA
PAQed, with points refunded (250)

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