abou rollback segment being too old

hi folks


any ideas on this one? i am running an erp application which stores its data in some 8654 tables recently i was runninga query like

select * from
dba_tables;

i was surprised to receive an error abou rollback segment being too old even though i was doing a select statement only there was no other user logged in at this moment
other than me.

thanks is advance
hrishy

Pl. post the exact error and also check V$SESSION to see if there are any sessions.

hi lakshmi

the problem has been solved (sounds bit stratnge) as this time i was not able to reproduce the error.but waht stil beats me is why did it occur in the first place as i was not performing any dml

read about this error in metalink for detials.

From my understanding, this error can happen provided query is long enough to make one round in a rollback segment's allocated extents and ANY transaction(eg. oracle background processes) has(or has before query started) activity on tables involved in the query.
The only solution I know is to have optimal settings for rollback segment used for transaction under consideration large enough.