Re: Flashback Query - Sanpshot Too Old Error

From: Prem K Mehrotra <premmehrotra_at_hotmail.com>
Date: 20 Nov 2004 14:50:37 -0800
Message-ID: <43441e77.0411201450.34514d08@posting.google.com>

"Anurag Varma" <avdbi_at_hotmail.com> wrote in message news:<KNund.768$AL5.367_at_twister.nyroc.rr.com>...

> "Prem K Mehrotra" <premmehrotra_at_hotmail.com> wrote in message news:43441e77.0411190717.376aded7_at_posting.google.com...
> > "Access" <idmwarpzone_NOSPAM__at_yahoo.com> wrote in message news:<419d1e62$0$30690$ba620e4c_at_news.skynet.be>...

> > > "Prem K Mehrotra" <premmehrotra_at_hotmail.com> wrote in message
> > > news:43441e77.0411181346.371091e5_at_posting.google.com...
> > > > premmehrotra_at_hotmail.com (Prem K Mehrotra) wrote in message

>  news:<43441e77.0411171713.1e148417_at_posting.google.com>...


> > > > > I am using Oracle 9i, 9.2.0.5 on HP UNIX 11.0. I have 2 GB of UNDO

> > > > > table

> > > > > space. When I do a flashback query, I get Snapshot too old error:

> > > > >

> > > > >  1   create table wreports_que_flash

> > > > >   2* as select * from wreports_que as of

> > > > > timestamp(to_timestamp('17-NOV-2004 00:00:00', 'DD-MON-YYYY

> > > > > HH24:MI:SS'))

> > > > > SQL> /

> > > > > as select * from wreports_que as of

> > > > > timestamp(to_timestamp('17-NOV-2004 00:00:00', 'DD-MON-YYYY

> > > > > HH24:MI:SS'))

> > > > >                  *

> > > > > ERROR at line 2:

> > > > > ORA-01555: snapshot too old: rollback segment number  with name "" too

> > > > > small

> > > > > ORA-22924: snapshot too old

> > > > >

> > > > > I do not have much database activity. My undo_retention = 604800

> > > > > which is seven days.

> > > > >

> > > > > I have done flashback queries in the past with success. I don't know

> > > > > why I am getting this error when I am only accessing a few hours ago

> > > > > of data.

> > > > >

> > > > > Any ideas will be helpful.

> > > > >

> > > > > Thanks a lot,

> > > > >

> > > > > Prem

> > > >

> > > > Any ideas?

> > > >
> > > > rem

> > >

> > > Your UNDO tablespace is too small

> > >

> > > Matthias

> >
> > Not really, my undo tablespace is 1800M and only 2.3% of the space is used.
> > Reason must be something else.
> >
> > Prem
> 
> Does the table you are selecting from have a CLOB/BLOB field ?
> If yes then what is the retention period for that?
> 
> Anurag

I now found renetion parameter for CLOB's. Since I did not specify any value, default value of undo_rention is used. So, it is still a mystery why I am getting snapshot too old error?

I don't see anything wrong in syntax of my flashback query? Received on Sat Nov 20 2004 - 16:50:37 CST