RE: DataGuard
- From: Boris Dali <boris_dali@xxxxxxxx>
- To: Laimutis.Nedzinskas@xxxxxxxxxxxxx, oracle-l@xxxxxxxxxxxxx
- Date: Wed, 17 Jan 2007 14:53:27 -0500 (EST)
Laimutis,
For applications running on 10gR2 we switched from the
homegrown scripts to a broker managed configuration.
And yes one of the main reasons is that it is RAC
aware. The other is the FSFO (fast-start failover).
It's new, there are one-offs, but overall so far it
works for us.
'Split-brain' scenario of having more than one
database accepting connections in a broker
configuration is prevented by the rule that two out of
three participants in the broker config should agree
before failover is attempted. There?s a brand-new
paper on the MAA site about it:
http://www.oracle.com/technology/deploy/availability/pdf/MAA_WP_10gR2_FastStartFailoverBestPractices.pdf
Thanks,
Boris Dali.
--- Laimutis Nedzinskas
<Laimutis.Nedzinskas@xxxxxxxxxxxxx> wrote:
> Once on 10gR1 I got my hands burned a little by DG
> process leaking RAM.
> Can this thing be trusted or is it better to rely on
> scripts?
>
> Next question: can a "Fast-Start Failover" be
> trusted? Did anyone try it?
> Running Observer on a separate machine raises a
> great lot of questions to me.
> What does happen if this observer starts standby
> database but primary is still online? It can be
> quite a mess if some clients do get connection to
> the primary and some to the standby. Or can the
> observer do kind of "fencing"(I´d say guaranteed
> killing) of the primary server? But how?
>
> Thank you in advance,
> Laimis N.
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