Improving performance of a DatabaseAdapter

Question

I have a DatabaseAdapter setup pulling information from about 8 tables. The tables are hierarchical, going at most 3 levels deep. Anyway, I've noticed that execution time increases exponentially because of the way TopLink generates the SQL queries.
After executing the first query, with the proper where clause (based on parameters), the following queries do not use the same where clause even though they are joining with all the tables in the hierarchy. For example, I'll see something like this in the log files:
select id, type, col1, col2
from table_one
where id = 75;
select t0.id, t0.type, t0.col3
from table_two t0, table_one t1
where ( (t0.id = t1.id)
and (t0.type = t1.type));
Is there a way to configure BPEL and TopLink to not do full joins on all tables? While I see the benefit of using minimal database reads to pull the data, it also seems overkill to read all the data and then only use a portion of it.

Answer 1

Correct me if I'm wrong, but creating a view won't really let me work with hierarchical data any better than right now.
My table structure looks like:
A
-- B
-- C
-- D
---- E
---- F
---- G
---- H
When TopLink needs to read data for tables E, it is doing a full join of A, D and E. If instead of doing a full join, it just read the values based on the input parameters (which were used by the query that pulled from A) then everything would be much more efficient.
Edited by: mmorasch on Oct 29, 2008 7:13 AM