Re: Using sequences with mutiple partitions

On 22 Apr., 19:53, joel garry <joel-ga..._at_home.com> wrote:
> On Apr 22, 12:50 am, Alex <dead.man.walk..._at_gmx.de> wrote:
>
>
>
>
>
> > Hello NG,
>
> > I'm stuck with the following problem and need the help of someone with
> > more oracle-exp. than me (which isn't that difficult)
>
> > Having a stored procedure which creates a multi-partitioned table
> > using an "AS SELECT" statement:
>
> > CREATE TABLE TMP_STG_IMPRESSION
> > TABLESPACE TS_AXNN_DATA
> > PCTUSED    0
> > PCTFREE    10
> > INITRANS   1
> > MAXTRANS   255
> > PARTITION BY HASH (hour_id)
> > PARTITIONS 16
> > STORE IN (TS_AXNN_DATA, TS_AXNN_DATA, TS_AXNN_DATA, TS_AXNN_DATA,
> > TS_AXNN_DATA, TS_AXNN_DATA, TS_AXNN_DATA, TS_AXNN_DATA, TS_AXNN_DATA,
> > TS_AXNN_DATA, TS_AXNN_DATA, TS_AXNN_DATA, TS_AXNN_DATA, TS_AXNN_DATA,
> > TS_AXNN_DATA, TS_AXNN_DATA)
> > NOLOGGING
> > NOCOMPRESS
> > NOCACHE
> > PARALLEL (DEGREE 4)
> > AS
> > SELECT
> > seq_AXNN_imp.nextval pk,
> > a.*
> > FROM
> > (SELECT ... FROM ... GROUP BY ...) a
>
> > The function of this statement is the building of a partitioned
> > staging-table to optimize (speed & space) further processing of the
> > data.
>
> > When executing this SP, the I cannot get any sequence-numbers. They
> > simply won't appear. Even though the sequences' counter is duly
> > raised.
> > All I got is the data from a.*
>
> > When dropping the PARTITION-clauses from the table-def, everything
> > works fine
> > When executing only the "SELECT seq_xenion_imp.nextval pk, a.* FROM
> > (SELECT ... FROM ... GROUP BY ...) a" everything works fine: I get all
> > the data from a + the values for "pk"
>
> > Sadly, I'm in need of the partitioning to prevent "monster-joins"
> > which are know to flood all of the TEMP-tablespace.
>
> > Does anyone know the reason for this behaviour?
> > Does anyone know a fix?
>
> > DB: Oracle 10g
> > Seq.-def.:
> > CREATE SEQUENCE AXNN.SEQ_AXNN_IMP
> >   START WITH 2
> >   MAXVALUE 999999999999999999999999999
> >   MINVALUE 1
> >   CYCLE
> >   CACHE 100000
> >   NOORDER;
>
> > Any help will be appreciated!
> > TIA
> > Alex Sauer
>
> There's a comment in the docs to the effect that a nextval used more
> than once in a statement will return the same value, and you can't use
> it in a union.  I'm guessing something makes one of these so in your
> statement - could you post the whole thing and an explain plan?  Also,
> your version with all the digits.  Must be the CTAS is a single
> statement... though I would expect the same value repeated if that
> were the case.  Any db links involved?
>
> http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/views....
>
> More people may give more specific help if you posted all ddl and data
> to recreate a simple version of the issue.  Or you might even figure
> it out yourself and tell us, just by doing that.
>
> jg
> --
> @home.com is bogus.
> Just what we need, more unstructured data.http://www.dbta.com/e-newsletters/fmbdi=5_Minute_Briefing_Data_Integr...- Zitierten Text ausblenden -
>
> - Zitierten Text anzeigen -

Thanks for your reply, but I dealt with this problem by optimizing the statement's code and a request of more disk-space. Because of me having to little time to evaluate this problem right now, I had to circumvent it.
Maybe later on, I'll get back to it, but that's not likely to happen...

So I just put down a "developer's remark" in the documentation

THX
Alex Received on Thu Apr 24 2008 - 03:42:59 CDT