RE: Recipe for application design to run on RAC

[Loughmiller, Greg]

Title: RE: Recipe for application design to run on RAC

So when I access the fantasy football league on the espn web site-I go to schema2 because my team(s) are losing :-)       I guess thats what I get when I picked a group of guys that are all on the injured reserve

 

 

Seriously though--What if 50% of the blocks of data for schema1 are "owned" by db2? do you eventually see where ownership is transferred to the "active" node, reduced cache fusion activity and then transfer of blocks?  Do the users on schema1 have to use the data on schema2 at all? I'm trying to see if not only are the users logically partitioned-but if your schemas offer any data partitioning to align with the schema1 and schema2....

 

thanks!

Greg

 

-----Original Message-----
From: Jamadagni, Rajendra [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, December 04, 2002 2:05 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: Recipe for application design to run on RAC

Hmmmm... it is probably not an good example but we too have a (couple of) mission critical app (affects on air production) running on 9i RAC. One of which has two major schema. We logically partitioned the application such that, for two groups of people 9accessing one schema each) we gave them a preference.

Schema1 users have tns entry for db1 and fail over to db2
Schema2 users have a preference for db2 with a fail over to db1

This effectively allows us to do load balance, they don't share too much data, so traffic through interconnect is manageable. If need be, we just shutoff listener on one side, and everyone fails over to the other side while we can perform maintenance. All their applications are written in VB, JAVA so they handle fail over from within application.

None of the people involved in the design worried about which side of RAC they will be on and how the DML activity affects etc etc. They designed a plain application with a good design and it is working fine.

Like I mentioned this is not a good example ... but this is how we did it in one of our major application.
Raj
______________________________________________________
Rajendra Jamadagni              MIS, ESPN Inc.
Rajendra dot Jamadagni at ESPN dot com
Any opinion expressed here is personal and doesn't reflect that of ESPN Inc.
QOTD: Any clod can have facts, but having an opinion is an art!