[oracle-l] Re: Double-Take for Oracle?
- From: Paul Baumgartel <treegarden@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Fri, 23 Jan 2004 15:26:32 -0800 (PST)
Carel-Jan,
Yes, the connection is pushed to its limits and we'd need about 20
times the bandwidth to support our highest rate of redo generation.
I'll look into the ssh and compression, thanks.
There was an exchange about Double-Take on this list a couple of years
ago (I remembered to search the archives _after_ I sent my post!).
Apparently it was made to work, but not without a visit from the
vendor's tech support folks.
Thanks,
Paul Baumgartel
--- Carel-Jan Engel <cjpengel.dbalert@xxxxxxxxx> wrote:
> Hi Paul,
> Is the connection between your sites pushed to the limits? You can
> use ssh,
> with compression and port forwarding, to get the redo info
> compressed. It's
> described in
>
http://metalink.oracle.com/metalink/plsql/showdoc?db=NOT&id=225633.1&blackframe=0
>
> (note 225633.1). Depends on the DG-method used. SSH/port forwarding
> won't
> bring you much improvement using LGWR SYNC, but can do so
> significantly in
> ARCH ASYNC mode.
>
> I'm sorry , I don't know the Double-Take stuff you described. What I
> would
> take into consideration is how to verify and monitor that the standby
>
> system actually gets synchronised, and what time instatiation takes.
> Is
> switchover possible? Otherwise a failover for switchover puposes
> might take
> a lot of time for re-instantiation, resulting in longer vulnerable
> periods
> with only one database available.
>
> Regards, Carel-Jan
>
>
>
> At 05:22 PM 1/23/2004, you wrote:
> >We're setting up a Data Guard physical standby here at our office;
> the
> >primary database is at a colocation facility about 100 miles away,
> with
> >a T1 currently providing networking between the two sites. The T1
> is
> >inadequate to keep up with the rate of redo generation during batch
> >operations (like imports) on the primary.
> >
> >Our IT suggested that I look at NSI's Double-Take, which claims to
> >replicate only byte-by-byte changes, and to support Oracle. I have
> two
> >questions for anyone who's used or considered using this product:
> >
> >1. Does Double-Take appreciably reduce network traffic compared to
> >Data Guard physical standby?
> >2. Does Double-Take work reliably with Oracle? Does Oracle support
> a
> >database that is replicated using this product?
> >
> >TIA
> >
> >
> >
> >=====
> >Paul Baumgartel
> >Transcentive, Inc.
> >www.transcentive.com
> >
> >__________________________________
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>
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