"Goran" <goran99_remove_at_yahoo.com> wrote in message
news:brs5di$e0a$1_at_fegnews.vip.hr...
<snip>
> > The chances that Sybrand has never done an upgrade for a real system are
> > pretty much nil.
> > For a 5gb database exp/imp is probably fine. For a 500gb or a 5TB
database
> > exp/imp might be somewhat less efficient than running the upgrade
scripts.
> > http://tinyurl.com/2hefg which is where Sybrand pointed the OP has a
> pretty
> > helpful discussion on when you might do what.
> >
> >
> > --
> > Niall Litchfield
> > Oracle DBA
> > Audit Commission UK
>
>
> Hi,
>
> Be sure that I studied the documentation for various versions thoroughly.
> But please note the following. The most recent issue regarding this matter
> is that a month ago we performed a test upgrade of 81740 >2TB dwh db to
> 92040 using v9 dbua on hpux. If the db were smaller than some 500GB, we
> wouldn't have even considered the upgrade, it would certainly be performed
> via exp/imp.
> And we are not quite happy with the results; i wouldn't discuss the actual
> issues, as they are still beeing considered in some open TARs.
> Now we consider performing the test again, only this time using
> export-import.. the same way we performed that when we moved the
particular
> db some two years ago from another OS to hpux.
> It will probably take more than a week.
> Anyway, with some careful planning, actual downtime should be less than a
> day, because importing the static historical data can take place after the
> import of essential schemas...
Of course you might get problems with the upgrade (and I think I'd always
run the scripts rather than use the GUI but that is probably irrelevant).
You also might get problems with the exp/imp route as well - like be unable
to export or unable to import the dump file. If you hit a bug you hit a bug.
The point is that there are clear advantages and disadvantages of both
methods and a blanket statement like 'use exp/imp don't use the upgrade
path' will be likely wrong for some people. pointing people at the
advantages and disadvantages tends to be more useful.
--
Niall Litchfield
Oracle DBA
Audit Commission UK
Received on Thu Dec 18 2003 - 06:36:03 CST
