Re: does FRA is really needed ?
- From: "Alex Gorbachev" <ag@xxxxxxxxxxxx>
- To: grzegorzof@xxxxxxxxxx
- Date: Sun, 16 Dec 2007 19:50:20 -0500
Just two things to mention:
- can have FRA but you don't have to backup your datafiles there or
even put your archivelogs there. you can manage all of it separately.
FRA is the only destination for flashback logs but that's it. Is
flashback logs what you need to restore quickly (i.e. without
rebuilding of the new standby) after switchover. You need to flashback
the database and flashback logs can only be stored in FRA. Thus, FRA
requirements but in fact it's enabled flashback logging that's
required. Am I right?
- Consider incrementally updated standby where you make often
incremental backups and ship them to standby. It's often the way to go
for DW applications but there is no automation with Data Guard.
On Dec 16, 2007 10:26 AM, Grzegorz Goryszewski <grzegorzof@xxxxxxxxxx> wrote:
> Thank You for quick responses. My main goal is making DG configuration
> for about 1TB no RAC data warehouse.
> Currently I dont have FRA, and really dont want to have :) because the
> FRA involves direct tape
> backups, needs additional space requirements, and people training,
> moreover You can
> make your Oracle to hang when there is no space in FRA.
> As You've written and I understand FRA is needed for 'soft' switching
> from failover configuration
> to primary one. (You dont need to resinstantiate database).
> My main concern is amount of redolog volume generated (like 100GB per hour).
> So far I've got many nologging operations, but when DG comes no more
> nologging tricks. As I've been told 100MB bandwidth is no problem so
> its only a matter of testing :).
> The most important for me is making switchover/failover as simple as
> possible hence I'm going for EM Grid Control GUI, with fully clickable
> solution.
> So far I've got no DG experience besides of Oracle training which is
> focused on Grid Control
> interface and leaves with no CLI practise. And the funniest thing is
> that there is need to make
> configuration fully runnable till the end of the Year :).
> Regards.
> Grzegorz
>
>
>
>
>
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Alex Gorbachev, Oracle DBA Brewer, The Pythian Group
http://www.pythian.com/blogs/author/alex http://www.oracloid.com
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