RE: dropping global temp tables

From: David Kurtz <info_at_go-faster.co.uk>
Date: Thu, 29 Jul 2004 22:23:05 +0100
Message-ID: <CKEAJBMGFEOCDBFILPJDEECMEFAA.info@go-faster.co.uk>

If table physically exists (you can see it in v$sort_usage) in the temporary segment because one or more session has put something into it, then you can't drop it.

If the GTT is on commit delete rows (the default), then when you commit or rollback the table is physically delete, and disappears from v$sort_usage. Then you can drop it (if nobody else is using it too).

If the GTT is on commit preseve, then the session that referenced it must be terminated to get Oracle to physically delete the segment.

regards

---

David Kurtz
Go-Faster Consultancy Ltd.

tel: +44 (0)7771 760660
fax: +44 (0)7092 348865
web: www.go-faster.co.uk

mailto:david.kurtz_at_go-faster.co.uk
Book: PeopleSoft for the Oracle DBA: http://www.psftdba.com PeopleSoft DBA Forum: http://groups.yahoo.com/group/psftdba

> -----Original Message-----
> From: oracle-l-bounce_at_freelists.org
> [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Daniel Fink
> Sent: 29 July 2004 21:13
> To: oracle-l_at_freelists.org
> Subject: Re: dropping global temp tables
>
>
> Jonathan,
>
> Do you receive an error? Depending on how the table is created, I
> cannot drop the
> table if there are rows in it.
>
> Regards,
> Daniel Fink
>
> Example:
> SQL> create global temporary table gtt_1 (gtt_col number);
>
> Table created.
>
> SQL> desc gtt_1
> Name
> Null? Type
>
>
> ------------------------------------------------------------------
> -- --------
> -------------------
> GTT_COL
> NUMBER
>
> SQL> drop table gtt_1;
>
> Table dropped.
>
> SQL> desc gtt_1
> ERROR:
> ORA-04043: object gtt_1 does not exist
>
>
> SQL> create global temporary table gtt_1 (gtt_col number);
>
> Table created.
>
> SQL> insert into gtt_1 values (1);
>
> 1 row created.
>
> SQL> select * from gtt_1;
>
> GTT_COL
> ----------
> 1
>
> SQL> drop table gtt_1;
>
> Table dropped.
>
> SQL> desc gtt_1;
> ERROR:
> ORA-04043: object gtt_1 does not exist
>
>
> SQL> create global temporary table gtt_1 (gtt_col number) on
> commit preserve rows;
>
> Table created.
>
> SQL> insert into gtt_1 values (1);
>
> 1 row created.
>
> SQL> select * from gtt_1;
>
> GTT_COL
> ----------
> 1
>
> SQL> commit;
>
> Commit complete.
>
> SQL> select * from gtt_1;
>
> GTT_COL
> ----------
> 1
>
> SQL> drop table gtt_1;
> drop table gtt_1
> *
> ERROR at line 1:
> ORA-14452: attempt to create, alter or drop an index on temporary
> table already in
> use
>
>
> SQL> truncate table gtt_1;
>
> Table truncated.
>
> SQL> drop table gtt_1;
>
> Table dropped.
>
> SQL> desc gtt_1
> ERROR:
> ORA-04043: object gtt_1 does not exist
>
> SQL>
>
>
> Jonathan Gennick wrote:
>
> > Sorry if this is the dumb question for the day, but how does
> > one go about dropping the definition for a global temp
> > table? DROP TABLE doesn't do the job for me.
> >
> > Best regards,
> >
> > Jonathan Gennick --- Brighten the corner where you are
> > http://Gennick.com * 906.387.1698 * mailto:jonathan@gennick.com
> >
> > Join the Oracle-article list and receive one
> > article on Oracle technologies per month by
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Received on Thu Jul 29 2004 - 16:21:01 CDT