Have had problems before where anything over a db link was flaky explain
plan wise. If you can have the basic query as a view stored remotely on the
db you link too it should work more consistently.
Iain Nicoll
-----Original Message-----
Sent: 29 August 2001 17:01
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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Author: Nicoll, Iain (Calanais)
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