|Subject:||Re: Load balancing between an RAC database cluster and Top Link|
|Posted by:||Daniel Morgan (damorg…@x.washington.edu)|
|Date:||Mon, 26 Jan 2004|
Greg Collett wrote:
> We are designing an environment which is comprised of 3 database
> servers clustered together using RAC 10g. Connecting to the database
> is an Oracle Application Cluster of 4 App Servers running toplink.
> Currently the connection is facilitated through XML using oracle jdbc
> My question: In order to properly load balance the calls to the
> databse servers, do I require a hardware level load balancer between
> the Application tier and the Database tier?
> My understanding is that Oracle chares the db cache between the 3
> servers, and I believe it does load balancing between the servers as
> well. However, the jdbc connection on the app servers currently points
> at 1 database machine directly, and if that machine went down, the app
> could not connect to the RAC cluster (without a manual change). Is
> there a non-hardware solution to get around this?
> I am new to some of this and would appreciate any guidance.
RAC, itself, balances the load applied to the cluster. You could add the
grid control to balance the entire enterprise.
(replace 'x' with a 'u' to reply)
Load balancing between an RAC database cluster and Top Link posted by gcolle…@reserveamerica.com on 26 Jan 2004