Re: direct distributed insert causes massive sorting on target, why?

Jonathan,

Let me setup a test in a test schema just to make sure I got it right and I will get the details. I was in a hurry to get the data over the first time and the sorts were killing us. (We swung a domain to a new server this weekend and it has been one of those "catnap every two hours and get paged" experiences and I haven't even had time to drink beer and watch the Cowboys get beat. Well, maybe some time.)

Here are some overview stats: 8.1.7.4, sun solaris, range partitioned tables on both sides. Make sure your target side is range partitioned and alter the default DOP to <1 on the target and see if that helps.

Jack

>
> I've had a little play around with this on 8.1.7.4.1,
> and I can't get the INSERT to run in parallel at all -
> all I get is a parallel select on the remote database.
>
> Are there any other details you had to set up
> to make this work ?
>
> What does the full execution plan look like -
> run it through Oracle's utlxplp.sql or something
> similar to get all the details - autotrace won't
> be good enough.
>
>
>
> Regards
>
> Jonathan Lewis
> http://www.jlcomp.demon.co.uk
>
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>
> -----Original Message-----
> To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> Date: 26 December 2002 22:07
> target, why?
>
> >> >alter session enable parallel dml;
> >> >
> >> >insert /*+ append parallel(a,12) */ into tablea a
> >> >select /*+ full(b) parallel(b,12) */ * from tableb_at_dblnk b;
> >> >
> >> >However, unexpectedly, this causes two sets of parallel processes
> to
> >> be spawned on the target. One of these sets goes to work
> immediately,
>
>
> --
> 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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Thanks,

Jack Silvey

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Author: Jack Silvey
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