Re: Setting event 1555
- From: David cheyne <david.cheyne@xxxxxxxxx>
- To: nnahata@xxxxxxxxxxxx
- Date: Wed, 10 Nov 2004 12:43:42 +0000
Naveen,
You've not given much background to the problem, but the answer to
your problem. May be a lot simpler than tracing.
Ora-01555s normally stem from problems from rollbacks. Either to few
(causing contention) or too small. So increase the number or make
them larger.
Another cause can be SQL doing fetches across commits. Usually
getting the code to commit less often solves this.
BUT, if your database is large (shall we say 100G+) then things can
get more complex=E2=80=A6..
On Wed, 10 Nov 2004 05:36:40 -0600, Nahata, Naveen (US - Hyderabad)
<nnahata@xxxxxxxxxxxx> wrote:
> Hi All,
>=20
> I see a few ORA-01555: Snapshot too old errors in the alert log daily.
> The trace file doesn't give much clue about the application/SQL that is
> causing the error.
>=20
> I'm planning to set event 1555 at the system level to get to the bottom
> of the problem.
>=20
> 1. What are the performance implications of setting this event? Is the
> impact high or low?
> 2. Should I use systemstate or errorstack in the event specification?
> What are the performance implications of both?
>=20
> Since I have no experience of setting this event in the past, please
> provide any useful information which I have not sought for in my above
> questions.
>=20
> Regards
> Naveen
>=20
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>=20
--=20
~~~~~
David Cheyne
Oracle Database Administrator
BA(hons.)
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