Re: Serious Issue in oracle
- From: Thomas Roach <troach@xxxxxxxxx>
- To: norman.dunbar@xxxxxxxxxxxxxxxxxxxxxxxxx
- Date: Tue, 26 Jan 2010 09:30:42 -0500
Norman,
You are right, I mispoke. I use this view to see blocking sessions which is
something you would see before a deadlock occurrs (depending on how quick
the deadlock occurs).
Cheers,
Tom
On Tue, Jan 26, 2010 at 3:15 AM, Dunbar, Norman <
norman.dunbar@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Morning Thomas,
>
> >> Yep, query gv$session and filter based on username,
> >> schemaname, and sql_id if you know it. Pay close attention
> >> to the event and blocking session columns. That will tell
> >> you if there is some sort of deadlock occurring.
>
> I'm puzzled. I've never seen a deadlock show up in V$SESSION or
> V$SESSION_WAIT before. Any deadlock I've actually seen - I've set up
> myself for testing purposes - usually has one statement killed by Oracle
> and an ORA-60 reported within a second and well before I get a chance to
> check these views.
>
> I know a second is a long time CPU wise, but I'm not all that sure that
> a deadlock will show up in either of these views. I'm interested though
> in knowing whether it does or doesn't - in case anyone has seen them
> show up.
>
> I've got a blog entry on deadlocks at
> http://qdosmsq.dunbar-it.co.uk/blog/?p=192 and I'd like to keep it up to
> date.
>
>
> Cheers,
> Norman.
>
>
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Thomas Roach
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