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To speed up the import.
Hope this helps.
Ashish
In article <7asgso$olp$1_at_nnrp1.dejanews.com>,
mark.powell_at_eds.com wrote:
> In article <xmdA2.2991$_m5.689408_at_newsread1-mx.centuryinter.net>,
> alu_at_dairynet.com (A Ustby) wrote:
> > Another Oracle question/observation....
> >
> > We have an instance (v7.3.3) that has 1000+ tables in it (purchased
> > application). A couple of the tables have 1.5 million rows in them. One of
> > these tables has 14 indexes on it. On the same box we run both production
and
> > test instances. We have the Oracle parameters (memory, sort area, etc) set
> > lower for the test instance. When we load production instance, it takes 17
> > hours. When we load the same data into the test instance, it takes 41 hours.
> > Both loads were done when the box was quiet.
> >
> > We are using the Oracle import utility. It appears the excess time is in the
> > index build phase. Could this be affected (that much !) by the Oracle sort
parm
> > size ? Any other insight ?
> >
> > The thing takes so long, we haven't done too much experimenting.
> >
> > Thanks.......... Art
> >
>
> Yes, loading the indexes with the table is in my experience a lot slower than
> loading with indexes=n then re-building the indexes from index build scripts
> when large tables are involved. You can help the import by setting buffer=
> to a large number and making sure a large rollback segment is available.
> Since import does not let you specify use of a specific rollback segment I
> take all of them offline except the one I want the import to use. You can
> help the index builds by altering your temporary tablespace initial and next
> larger during the index rebuilds using the import or manual rebuilds. This
> will only work when other jobs can be kept of the system while the import is
> running.
>
> Mark D. Powell -- The only advice that counts is the advice that
> you follow so follow your own advice --
>
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>
-----------== Posted via Deja News, The Discussion Network ==---------- http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own Received on Thu Feb 25 1999 - 14:43:17 CST