RE: Flashback Database NEWBIE - 10g - Going to setup one for first time
- From: Gerald Cunningham <gcunningham@xxxxxxxxxxxxxx>
- To: "Christopher.Taylor2@xxxxxxxxxxxx" <Christopher.Taylor2@xxxxxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 7 Mar 2013 17:18:01 -0500
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@xxxxxxxxxxxxx [oracle-l-bounce@xxxxxxxxxxxxx] On Behalf
Of Christopher.Taylor2@xxxxxxxxxxxx [Christopher.Taylor2@xxxxxxxxxxxx]
Sent: Thursday, March 07, 2013 5:13 PM
To: oracle-l@xxxxxxxxxxxxx
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@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Christopher.Taylor2@xxxxxxxxxxxx
Sent: Thursday, March 07, 2013 3:32 PM
To: oracle-l@xxxxxxxxxxxxx
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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