Re: max 5% of pga_aggregate_target for a single serial session

Thanks, I found it from the materials.

Tanel.

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Wednesday, December 31, 2003 8:19 AM

> Chapter 9, page 33 - Cat-Hash-strophes
> in the seminar notes. (The page number
> may have changed a little).
>
> If you have a plan like this, all the leading
> tables have been hashed into memory at
> the same time.
>
> HASH JOIN
> TABLE ACCESS (FULL) OF TABLE_4
> HASH JOIN
> TABLE ACCESS (FULL) OF TABLE_3
> HASH JOIN
> TABLE ACCESS (FULL) OF TABLE_2
> TABLE ACCESS (FULL) OF TABLE_1
>
> It is true that Oracle only works out the cost of joining
> two objects at a time - but the actual execution can pass
> results from stage to step before a step is completed,
> just like the NL join.
>
> In this example, the 10053 trace showed (if I recall
> correctly):
> calc 1: join t2 to t1 with swap_join_inputs
> calc2: join t3 to result1 with swap_join_inputs
> calc3: join t4 to result2 with swap_join_inputs
>
> Regards
>
> Jonathan Lewis
> http://www.jlcomp.demon.co.uk
>
> The educated person is not the person
> who can answer the questions, but the
> person who can question the answers -- T. Schick Jr
>
>
> One-day tutorials:
> http://www.jlcomp.demon.co.uk/tutorial.html
>
>
> Three-day seminar:
> see http://www.jlcomp.demon.co.uk/seminar.html
> ____UK___November
>
>
> The Co-operative Oracle Users' FAQ
> http://www.jlcomp.demon.co.uk/faq/ind_faq.html
>
>
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Wednesday, December 31, 2003 12:19 AM
>
>
> > I've alway understood that joining occurs always in two steps, first two
> > tables, then their result (row source) with next table and so on, so
> there's
> > no need for more than 2 hash tables for example?
> >
> > Tanel.
> >
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Jonathan Lewis
> INET: jonathan_at_jlcomp.demon.co.uk
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Tanel Poder
  INET: tanel.poder.003_at_mail.ee

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