Re: Wrapping Query in "select *" changes execution path
Date: Fri, 4 Jun 2010 11:32:50 +1000
optimizer_mode string ALL_ROWS
If I hint the query to be
select /*+ all_rows */ * from ( ... subuery....) it reverts to the initial explain plan.
On 4 June 2010 10:24, Ray Feighery <rjfeighery_at_gmail.com> wrote:
> Oracle 10.2.0.4
> Red Hat 4 x86_64
> We have an application that runs standard SQL as a reporting tool. The
> amount of rows that can be returned is limited by a variable. The
> application manages this by changing the straight SQL
> from this:
> select *
> from users;
> into this:
> select * from (
> select * from users)
> where rownum < 25000
> This is causing a change in some execution paths.
> Is there any (simple) way I can stop or influence this behaviour?