Re: Temporary Views

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От Bruce Momjian
Тема Re: Temporary Views
Дата
Msg-id 200208132256.g7DMual27660@candle.pha.pa.us
обсуждение исходный текст
Ответ на Re: Temporary Views  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: Temporary Views
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Tom Lane wrote:
> Bruce Momjian <pgman@candle.pha.pa.us> writes:
> > Does every other user see the view name
> 
> If he looks in the schema where the view is created, sure --- it's no
> different from any other non-temp table or view.
> 
> > ... on his temp table?
> 
> Um, are you thinking that a view V created to refer to user 1's temp
> table T would refer to some other user's temp table T if accessed by
> that other user?  That's not how it works.  The reference is absolute,
> ie, by OID.
> 
> > Can two
> > people create a view on a temp table at the same time?
> 
> Not the same name in the same schema, but this has nothing to do with
> what the views refer to; that's just a plain old name collision.
> 
> CREATE TEMP VIEW would be handy for avoiding name collisions if you want
> to use the same temp view name in different clients.  But it'd only hide
> the *name* of the view (by putting it in your private temp schema); it
> has nothing to do with access semantics.

Yes, I realize that, but when I create an index on a temp table, I can
create it even though someone else tries to do the same in another
session.  If these views on temp tables go away on session exit, and
can't be reliably accessed by other users, they should be in the temp
schema and therefore invisible to other users and to prevent name
conflicts.

--  Bruce Momjian                        |  http://candle.pha.pa.us pgman@candle.pha.pa.us               |  (610)
359-1001+  If your life is a hard drive,     |  13 Roberts Road +  Christ can be your backup.        |  Newtown Square,
Pennsylvania19073
 


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