RE: Measure database availability beyond 99.9%

Though rarely seen, the legitimate purpose could be the analysis of where to
apply effort to increase the actual HA (measured as you suggest with service
level monitoring). In brief, it is akin to Ahmdahl's law, but in
availability you can't be available more than the availability of the least
available component. Of course that is a ceiling since there is no guarantee
of the coincidence of the other outages.

So if the database is significantly more available than network connectivity
from clients, it does not make much sense to spend on increasing the
availability of the database.

Regards,

mwf

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Niall Litchfield
Sent: Friday, August 29, 2008 3:04 PM
To: GiantPanda@xxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: Re: Measure database availability beyond 99.9%

Aaaarrrrgh! I'm sure there's a purpose that isn't lying to justify
expensive investments. I just cannot see it. Real HA must do service
level monitoring  (aka can the users work) what you seem to propose
has no clear benefit, please tell me I'm wrong.

<snip>



--
http://www.freelists.org/webpage/oracle-l

Other related posts: