Hi, You may use tools such as truss/strace etc(depend on OS) to check which steps are slow. 2008/9/12 raja rao <raja4list@xxxxxxxxx> > eventhough the db is big around 1 TB, all datafiles are in single > mountpoint. > > but i am really looking to start debugging (dont knwo if oradebug or > someother utility will help what is happening after mount and before open). > > > --- On *Fri, 9/12/08, Prasad <p4cldba@xxxxxxxxx>* wrote: > > From: Prasad <p4cldba@xxxxxxxxx> > Subject: Re: startup takes long time on 10gR2. > To: raja4list@xxxxxxxxx > Cc: oracle-l@xxxxxxxxxxxxx > Date: Friday, September 12, 2008, 9:08 AM > > > how about checking the datafiles placements. probably it will be a good > way to start debugging is by starting with making datafiles offline for some > non-system tablespaces and see if it helps. > > On Thu, Sep 11, 2008 at 8:26 PM, raja rao <raja4list@xxxxxxxxx> wrote: > >> One of our test instances, the startup process is taking more time. >> >> >> sga is ~2gb. >> >> >> Total System Global Area 2130706432 bytes >> Fixed Size 2031448 bytes >> Variable Size 1140850856 bytes >> Database Buffers 973078528 bytes >> Redo Buffers 14745600 bytes >> >> especially, the open phase takes long time.(around 10 mins) >> instance allocation and mount phase are quick. >> >> >> Can someone help me, how to start research and reduce the time. >> >> Thanks, >> Raj >> >> >> > > -- Regards, Yaping Chen http://yaping123.wordpress.com