Re: Why the TEMP tablespace is not being used while creating MV

The temporary tablespace would be used to perform sorts, or aggregations, should they not fit in memory.

But the temporary segment that will later become the actual materialized view is created in the tablespace where you're creating the object itself. It's the same with a "create table as select" for example.

If oracle would first create the whole MVIEW in the temp tablespace, and then copy it accross -- think about it, that would take a lot longer than necessary, and waste a lot of resources.

The segment basically is only of "temporary nature" while the creation process is running -- therefore oracle allocated "temporary extents". These are then "converted" to a normal set forming the segment, which makes up the final object.

Cheers

Stefan

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On Fri, Jun 26, 2009 at 12:01 AM, Xu, Roger <Roger.Xu_at_dpsg.com> wrote:

> Oracle 10.2.0.4.0
>
>
>
> I am getting the following while creating MV. Why the TEMP tablespace is
> not being used? Thanks.
>
>
>
> *
>
> ERROR at line 58:
>
> ORA-01652: unable to extend temp segment by in tablespace
>
>
>
>
>
> SQL> show user
>
> USER is "BTPMUSER"
>
> SQL> select TEMPORARY_TABLESPACE from user_users;
>
>
>
> TEMPORARY_TABLESPACE
>
> ------------------------------
>
> TEMP
>
>
>
> SQL> !tail -5 /u01/app/oracle/admin/BTPMBID/bdump/ alert_BTPMBID.log
>
> Current log# 2 seq# 402 mem# 0: /u08/mirrlog/BTPMBID/redo/redo_g2_m1.dbf
>
> Current log# 2 seq# 402 mem# 1: /u07/origlog/BTPMBID/redo/redo_g2_m2.dbf
>
> Thu Jun 25 17:50:15 2009
>
> ORA-1652: unable to extend temp segment by 128 in
> tablespace BTPMTBL
>
> ORA-1652: unable to extend temp segment by 128 in
> tablespace BTPMTBL
>
>
>
> SQL>
>
>
>
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