Have you tried using a /*+ PUSH_SUBQ */ hint?
If I'm interpreting what you say correctly you want the subquery to execute
first so this might (or might not) help.
Good luck!
Jay Miller
-----Original Message-----
Sent: Wednesday, August 29, 2001 12:01 PM
To: Multiple recipients of list ORACLE-L
Hi,
We face the strange problem that an executionplan is changed recently
without
any reason. Now it runs with a full_table scan and it did not do so.
The query is executed through a dblink and is part of a batch.
- nothing has been changed recently in the app everybody agrees on here,
- analyze runs each weekend and a select count(*) differs slightly between
num_rows in
dba_tables for the specific table
- when executing the query manually in two parts the subquery first and ten
the value returned
hardcoded in the main-query it performs very good
- when I ask for an explain plan in the database the link points to the
explain plan says it uses an index
Details: oracle 7.3.4, hp-ux 10.20
Query:
select * from debtor_claims@deca_link
where debtor_claim_id =
(
select max(debtor_claim_id)
from debtor_claims@deca_link
where res_id = 17777291 and
counter_booking_flag = 'N'
)
Tia,
Jeroen
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