JDBC multipool in WL7: which statement is correct?

Question

Hi,
When I try to figure out a method to set up database failover with weblogic cluster,
I encouter the following interesting and inconsistent statements from different places
of Weblogic documents.
1. In the WL7 administration console, once I click on the multipool node, I read
the following statement:
"..., MultiPools are supported for use in non-clustered servers and for local
(non-distributed) transactions only."
2. In the WL7 online document "Using Weblogic Clusters", the section "Introduction
to Weblogic Clustering" has the following statements:
"..., WebLogic Server allows you to cluster JDBC objects, including data sources,
connection pools and multipools, to improve the availability of cluster-hosted applications."
The paragraph "Load balancing for JDBC connections" of the section "Load balancing
in cluster" also mentions ..., Load balancing of JDBC connection requires the use
of a multipool configured for load balancing."
The paragraph "Failover and JDBC Connections" of the section "Failover and Replication
in a Cluster" mentions that "..., If you have replicated, synchronized database instances,
you can use a JDBC multipool to support database failover. In such an environment,
if a client cannot obtain a connection from one connection pool in the multipool
because the pool doesn't exist or because database connectivity from the pool is
down, WebLogic Server will attempt to obtain a connection from the next connection
pool in the list of pools."
My question is, can I use the JDBC multipool in Weblogic cluster environment for
the purpose of database failover? Or I can't?
Thanks.

Answer 1

Has anyone gotten this to work?
I have set up a test as the following.
50,000 orders going into the database within a multipool set up. I run the test
and see that it works very well with the load-balancing algorithm.
I re-run the test and after about 2,000 orders being placed, I shut down one of
the database servers.
Nothing works after this. This is in a 2-instance cluster. I was a little leary
about not having a clusters tab in the multipool when I created it. I selected
the servers that particpate in the cluster but I wasn't sure about that.
I keep getting not able to create connection errors.
Anyone get this to work yet?
cb
"Xiang Rao" <[email protected]> wrote:
>
Hi Dave and Joe,
Thanks for clarification and helps. On the other hand, should the administration
console for Multipool also add "Cluster" tab in the target in the future?
Xiang
"Dave Cabelus" <[email protected]> wrote:
Hi,
Sorry for the confusion. The clustering book is correct. The statementin
the Administration
Console is incorrect. You can use MultiPools in a cluster as you woulduse
a connection
pool. The JDBC documents are currently being updated.
Best regards,
Dave
"Xiang Rao" <[email protected]> wrote:
Hi,
When I try to figure out a method to set up database failover with
weblogic
cluster,
I encouter the following interesting and inconsistent statements fromdifferent
places
of Weblogic documents.
1. In the WL7 administration console, once I click on the multipoolnode,
I read
the following statement:
"..., MultiPools are supported for use in non-clustered serversand
for
local
(non-distributed) transactions only."
2. In the WL7 online document "Using Weblogic Clusters", the section
"Introduction
to Weblogic Clustering" has the following statements:
"..., WebLogic Server allows you to cluster JDBC objects, includingdata
sources,
connection pools and multipools, to improve the availability of cluster-hosted
applications."
The paragraph "Load balancing for JDBC connections" of the section
"Load
balancing
in cluster" also mentions ..., Load balancing of JDBC connection requires
the use
of a multipool configured for load balancing."
The paragraph "Failover and JDBC Connections" of the section "Failoverand
Replication
in a Cluster" mentions that "..., If you have replicated, synchronizeddatabase
instances,
you can use a JDBC multipool to support database failover. In such
an environment,
if a client cannot obtain a connection from one connection pool inthe
multipool
because the pool doesn't exist or because database connectivity from
the
pool is
down, WebLogic Server will attempt to obtain a connection from thenext
connection
pool in the list of pools."
My question is, can I use the JDBC multipool in Weblogic cluster environment
for
the purpose of database failover? Or I can't?
Thanks.