So, as I understand the problem statement; you have a UAT database, protected
by DataGuard, that gets periodically refreshed from a Production database, and
the refresh takes 2 days.
So, when you do your refresh, why not stop DataGuard before the refresh; and
refresh both the primary and “standby” at the same time. More work; but
shouldn’t take significantly more time.
Sent from my iPhone
Clay Jackson
On Nov 14, 2019, at 4:56 AM, Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx> wrote:
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That's true - also non-production databases can have stricter recovery point
and time objectives. However, copy-on-write snapshots seem like a better fit
for the case you described - especially for large databases.
Best regards,
Nenad
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From: Mark W. Farnham <mwf@xxxxxxxx>
Sent: Donnerstag, 14. November 2019 00:01
To: howard.latham@xxxxxxxxx; Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
Cc: rjgoulet@xxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: RE: is there any way i can avoid rebuild physical standby database
after every PROD to UAT database refresh ?
Also hang on a minute about whether the standby of UAT is needed.
Can the UAT be reinstantiated from PROD? Yes. So recovery to the point of a
fresh refresh from PROD does not require a backup.
However before you run off shouting a standby is not needed you need to know
how UAT is used.
For example, it could be refreshed once a week or month and used to test
development that has been passed out from engineering. The first step after
the refresh might be complicated changes to the structure of the data that may
require hours or days. Let’s say that is cleverly scheduled for the weekend,
and then the UAT test team commences work on the clean update massaged from
PROD to use the improved application suite.
Bam! the primary UAT server bites it. Do the thousands of dollars per hour
expert user new functionality testers (often including consultants) twiddle
their thumbs for a couple days while UAT is restored from PROD and then
re-updated to be ready to test the software revision? NO, because you bring up
the standby and fork them over there until you can fail back.
Now, given the exact purpose and use of the UAT database at a particular
department of a particular company, perhaps we can streamline something.
The large majority of UAT databases I have seen are used for three things:
1) the scenario above, testing new application functionality
2) vendor updates (Oracle RDBMS, operating system, or both) where you
refresh from PROD, run the updates (or patches), and then run your regression
test. The updates and patches can be too long to repeat cost effectively.
3) experimenting on the PROD data’s copy on UAT to investigate User
reported bugs.
Having this functionality unavailable during whatever prime time is while a new
refresh is done is often not acceptable. In 24 by 7 nearly flat loads, it may
require 2 UAT databases, each with a standby, so that while one is being
refreshed the other is still available for anything that does not require newer
data.
Question it? Sure. But there is a very good chance it IS needed.
mwf
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