I am sorry I don't think I was clear with my answer.
In the snap$_table_name table there is a field that
stores the rowid of the record from the master table.
I would think if a record is in the mlog$ table with a
delete dml type Oracle can delete it from the
snap$_table_name table by using rowid.
- dgoulet_at_vicr.com wrote:
> James,
>
> Rowid's are not included in snapshots unless
> specifically specified in the
> create snapshot statement with the "with rowid"
> qualifier. With primary key is
> the default.
>
> Dick Goulet
>
> ____________________Reply
> Separator____________________
> Author: james ellis <jellis24_gso_at_yahoo.com>
> Date: 1/12/2001 2:16 PM
>
> Dennis,
> I would think since the snap$ table has the rowid
> value that when a delete needs to be performed it
> would delete using the rowid.
>
> James
> --- Dennis Taylor <ismgr_at_pctc.com> wrote:
> > At 10:06 AM 1/12/01 -0800, you wrote:
> > >hi list
> > >
> > >would any refresh of a snapshot fire a query
> > against the base table?
> > >
> > > i think its supposed to go against the mlog$
> table
> > of the base table. we
> > >have a situation where there is a poor-performing
> > query that is fired at
> > >exact intervals accessing the base table and no
> > application seems to be
> > >firing it?
> >
> > The mlog$ table only contains a couple of fields,
> > one of which is the ROWID
> > of the affected record, and another is the dml
> > operation (insert, delete,
> > update). I'd assume that the snapshot update uses
> > this info to go get the
> > affected record (unless it's a delete) from the
> base
> > table.
> >
> > This is weird when you think of it. It implies
> that
> > the snapshot process is
> > able to get "old" information, i.e. the record
> from
> > before the delete, so
> > that it can grab the PK info. Or am I missing
> > something?
> >
> >
> > Dennis Taylor
> > --------------------------------
> > Save the plankton - nuke the whales!
> >
> > --
> > Please see the official ORACLE-L FAQ:
> > http://www.orafaq.com
> > --
> > Author: Dennis Taylor
> > INET: ismgr_at_pctc.com
> >
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Received on Tue Jan 16 2001 - 11:05:50 CST
