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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Looking for 24 X 7 Design Considerations
SLA - Service Level Agreement
How do you do trending? Monitor the heck out of your DB and plan ahead.
David A. Barbour
Oracle DBA, OCP
AISD
512-414-1002
Sandi.McClary_at_f
lyingj.com To: Multiple recipients of list ORACLE-L
<ORACLE-L_at_fatcity.com>
Sent by: cc:
root_at_fatcity.co Subject: RE: Looking for 24 X 7 Design
Considerations
m
09/17/2001
02:05 PM
Please respond
to ORACLE-L
What is SLA?
How are you doing trending?
Christopher
Spence To: Multiple recipients of
list ORACLE-L <ORACLE-L_at_fatcity.com>
<cspence_at_Fuel cc:
Spot.com> Subject: RE: Looking for 24 X
7 Design Considerations
Sent by:
root_at_fatcity.
com
09/17/01
11:00 AM
Please
respond to
ORACLE-L
In my opinion, one of the biggest things with 24x7 is planning.
Documenting
what is normal maintenance either it be for your application or for the
database itself. This means finding out how often normal maintenance
(index
rebuilds, re-orgs, data loads) runs, and how long. This is a good step
regardless if the shop is 24x7, this way you know at all times what is
needed and when.
Then you need to determine which systems are critical to the success of the application, i.e. database, backups, hubs and such. Then I would work on a solution that will provide redundancy for these devices. One thing I like to do is make a list of all types of failure, and then my expected results, and time frame of recovery. Then I would consult with management and determine which are acceptable and which are not.
I cannot stress the usefulness of SLA's, either to a customer or to a department (generally it is good to have both). This will give you a baseline you must follow. If you have something that takes 10 seconds, and you say it must be faster than 15 seconds, and one day it becomes 11 or 12, you have a good idea how things are going and can take measures. Finding important areas where you attach a metric.
Another thing to be concerned with, and which can be a life saver is trending. This is very important in 24x7 environments so you can say "Ok, in 6 months we are going to add 50Gb and a second tape drive, this is going to cost $10,000 and will take 6 hours of time.".
In a 24x7 environment the best thing is to already know the problem. It is
the problems that come up unexpectantly that make things very difficult.
Preparation and planning is critical to 24x7 environments. Knowing what
can
happen and what you will do to resolve it ahead time can be a big
difference.
Hope this helps,
"Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes."
Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275
Fuelspot
73 Princeton Street
North, Chelmsford 01863
-----Original Message-----
Sent: Monday, September 17, 2001 11:15 AM
To: Multiple recipients of list ORACLE-L
We currently have 15+ databases (7.3.4 & 8i using IBM AIX and HACMP) that
do
not have a 24x7 restriction. Now, management is looking to bring in new
products that will need to be 24X7. They are looking for costs to
determine
the viability of such a decision. I have no 24x7 experience and am looking
for
ideas or options to consider. [At least initially they are stating there
can
be no downtime for maintenance (upgrades/reorgs)]
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