Re: Slow Oracle Export???

Tim Irvin wrote:
>
> In article <32311d4b.175274136_at_news.concentric.net>, jljoslin_at_cris.com (J
> L Joslin) wrote:
>
> > On 2 Sep 1996 16:56:15 GMT, Vijay Vardhineni 604-1835 <vvardh01>
> > wrote:
 

> > >I'm running Oracle 7.2 on an HP9000. An export on a 1.5 GB table is
 taking about 7 hours. I've tried a bunch of different values f=
> > >or exp, but it doesn't seem to make a difference. We are using a fast
 cybernetics CY-8505 tape drive. Anyone have any suggestions?=
> > >
> >
> > AH HA! You're running the export to TAPE! Possibly the slowest mass
> > storage device known to man. Export the data to disk first. It'll be a
> > whole lot faster and your export dump file will not be even close to
> > the full 1.5GB in the table.
>
> Indeed. We do cold backups on two databases nightly, starting at 12:30
> AM. The previous DBA just shut the databases down, sequentially, copying
> all database files and corresponding file system data (files maintained
> by version control system which must be in sync with oracle) to tape and
> then restarted the databases. This took us until 5:30 or 6:00 AM for
> less than 500 MB of total backup. (He was also using a *remote* tape
> device, slowing it down even more).
>
> I changed it last week to backup to disk, tarring up everything associated
> with each database. After the disk backup was complete, I restarted the
> database and then copied from disk to tape. (I have a permanent archive
> on tape now, *and* a recent cold backup for faster recovery if the last
> backup was good.) Both databases are now backed up and restarted by 1:15.
>
> If minimum downtime is essential, backup to disk first, even if you have
> to buy another disk drive *dedicated* to that purpose. Disks are cheap
> these days; lost productivity and/or sales due to downtime are not.
>
> --
> Tim Irvin, HP-UX System Administrator / Oracle DBA
> Lockheed Martin Missiles and Space, Sunnyvale, California
> e-mail: irvin_at_lmsc.lockheed.com voice: (408) 742-0440
> ************ all standard disclaimers apply ************
You may further reduce disk to tape tar times, if you compress the export dump file.

Joseph Suh
DB Technology, Inc.
Atlanta, GA, USA Received on Wed Sep 11 1996 - 00:00:00 CEST