RE: Flashback Database NEWBIE - 10g - Going to setup one for first time
Date: Thu, 7 Mar 2013 17:18:01 -0500
Message-ID: <68F9DD51BF61E943BFA45D744048A7A731067CB75B_at_nbp-ex01.proteus-technologies.com>
15Tb FRA will let you run for 3 months before you remember that you didn't drop a gauranteed restore point.
Theoretically.
:)
From: oracle-l-bounce_at_freelists.org [oracle-l-bounce_at_freelists.org] On Behalf Of Christopher.Taylor2_at_parallon.net [Christopher.Taylor2_at_parallon.net] Sent: Thursday, March 07, 2013 5:13 PM
To: oracle-l_at_freelists.org
Subject: RE: Flashback Database NEWBIE - 10g - Going to setup one for first time
I've checked the MAX redo log generation for the training database.
The maximum for any day (rounded up) is 80GB.
If I want to make sure I have enough FLASHBACK space for 5 business days I thought about using 6x80 (to give me an extra day of space "just in case") and come up with 480 GB of redo generated that I need to be able to flashback from.
In this case is 500GB enough for a flashback area or am I still leaving out something?
Chris
-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Christopher.Taylor2_at_parallon.net
Sent: Thursday, March 07, 2013 3:32 PM
To: oracle-l_at_freelists.org
Subject: Flashback Database NEWBIE - 10g - Going to setup one for first time
We have a training database that we're going to setup as a flashbackable database (is that a word?). The requirement is to take the restore point on Monday, do the training and then flashback to the Monday restore point on Friday evening/Saturday morning.
This training database currently is not flashback enabled and generates regular amounts of redo etc.
Here's my first question: Can I look at the existing training database and query the amount of redo activity generated to calculate the flashback area size that I need to setup? I'll want to be able to flashback to any point during the week on the off chance they really fubar something and need to go back a day.
If this is true, what view(s) do I need to look at to drive my calculations?
Second question: In the event I need to do a flashback to a the day before (say Thursday back to Wednesday) will I still be able to flashback to Monday once I get to Friday night? I assume the answer to this is yes as long as the Monday flashback is a guaranteed flashback recovery point. Please correct me if I'm wrong on that or need additional guidance.
Regards,
Chris Taylor
Oracle DBA
Parallon IT&S
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Received on Thu Mar 07 2013 - 23:18:01 CET