help execution plan changes when using a dblink

> -----Oorspronkelijk bericht-----
> Van: Jeroen van Sluisdam
> Verzonden: woensdag 29 augustus 2001 17:02
> Aan: 'oracle-l_at_fatcity.com'
> Onderwerp: help execution plan changes when using a dblink
>
> 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_at_deca_link
> where debtor_claim_id =
> (
> select max(debtor_claim_id)
> from debtor_claims_at_deca_link
> where res_id = 17777291 and
> counter_booking_flag = 'N'
> )
>
> Tia,
>
> Jeroen

-- 
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-- 
Author: Jeroen van Sluisdam
  INET: jeroen.van.sluisdam_at_vrijuit.nl

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