And, of course, HASH_MULTIBLOCK_IO_COUNT blocks should be read/written
in a single IO, which limits the size of both DB_FILE_MULTIBLOCK_READ_COUNT
and HASH_MULTIBLOCK_IO_COUNT to the maximum contiguous IO size supported
by the OS. On Solaris 2.7 and AIX 4.3.3, it used to be 256k. On HP-UX 11,
it's 1M. It's an old wisdom that temp tablespace extent should be a multiple
of max IO size + some fixed value as the extent header. I use 4k as the
rule of thumb. I don't have a rational explanation, but I've never had any
problems with segments sized that way, either.
On 2003.05.19 07:21 Steve Perry wrote:
> Joan's problem/solution of setting "hash_multiblock_io_count=2" sounds a lot
> like this from metalink.
>
> When a user's temporary tablespace is type=temporary and
> extent size < hash_multiblock_io_count an ORA-3232 is raised
> when an attempt is made to perform a hash join.
> if the HASH_MULTIBLOCK_IO_COUNT is NOT set or = 0, then set it to 2 or 8
>
> Steve
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Monday, May 19, 2003 5:01 AM
>
>
> > Hi
> > Do know if that work both in windows and unix?
> > Regards
> > PG
> >
> > -----Original Message-----
> > Sent: sexta-feira, 16 de Maio de 2003 19:48
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > AK,
> >
> > I had temp tablespace problem on a new server this early year. A
> > particular query always run out of temp space (2 gig for a small
> > database). I off-line the temp, recreate the temp, coalesced, recreate
> > temporary tablespace or regular tablespace, changed the pctincrase from
> > 0 to 1, forced wake up smon to clean. Guess what? I still got same
> > problem until I put hash_multiblock_io_count=2 in the ini.ora file.
> > Don't ask me why. It never had problem after since.
> >
> > Joan
> >
> > > AK wrote:
> > >
> > > What is the way to shrink temp tablespace . I tried alter tablespace
> > > colesce .. doesn't seems to work and I can't bring down the db .
> > >
> > > -ak
> > >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > --
> > Author: Joan Hsieh
> > INET: joan.hsieh_at_tufts.edu
> >
> > Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> > San Diego, California -- Mailing list and web hosting services
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> > also send the HELP command for other information (like subscribing).
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > --
> > Author: Paulo Gomes
> > INET: PGomes_at_Datinfor.pt
> >
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>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Steve Perry
> INET: sperry_at_sprynet.com
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> San Diego, California -- Mailing list and web hosting services
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>
--
Mladen Gogala
Oracle DBA
--
Please see the official ORACLE-L FAQ: http://www.orafaq.net
--
Author: Mladen Gogala
INET: mgogala_at_adelphia.net
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
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Received on Mon May 19 2003 - 08:11:17 CDT
