Can I change the evaluation plan in BDB?

I am a beginner. I wonder if I can change the evaluation plan in BDB so that I can explicitly say I want to do merge join as an example?
thanks a lot!
Edited by: user11201453 on May 26, 2009 8:20 AM

Thank you for your reply. I appreciate.
I think my question is not clear. sorry for that.
For example,
I want to run a sql query:
select *
from A, B
where A.a=B.b
The DB then will parse it and generate a plan to evaluate this query.
For example,
scan A
scan B
join
There are several join methods, like index join, sort merge join...BDB's optimizer will choose one that I cannot know.
I want to use merge join and I don't know how to explicitly tell BDB to use it.

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