Failover and Load Balancing with JNDI Connection Pools

Hi,
I am trying to figure out how would JNDI Connection Pooling work along with failover or DNS Load Balancing.
Would connections be distributed equally among the list?
Would the pool work with multiple heterogeneous connections (i.e. connections to different but equivalent servers ), or do all the connections in the pool have to be homogeneous (i.e. to the same server)?
Thanks,
Sergio

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Cache and Load Balancing with Oracle APEX Listener

Hi,
I intend to use only HTTP access.
How to implement a Cache and Load Balancing with the Oracle APEX Listener?
Is it possible to do with the the standalone running APEX Listener?
Thanks by advance for any tips/documentation/references.
Kind Regards.

Hi,
I think this question is best asked in the APEX Listener forum:
ORDS, SODA & JSON in the Database
Kind regards
Sandro

Load balancing to JDBC connection pool

from http://e-docs.bea.com/wls/docs61///////cluster/overview.html
"WebLogic Server provides limited load balancing support for managing JDBC
connections in a cluster. If you create an identical JDBC DataSource in each
clustered WebLogic Server instance and configure those DataSources to use
different connection pools, the cluster can support load balancing for JDBC
connections. Note, however, that WebLogic Server provides no special load
balancing policies for accessing connection pools. If one of your connection
pools runs out of JDBC connections, the load balancing algorithm may still
direct connection requests to the empty pool."
How is this different from creating one connection pool with one datasource
and targetting the cluster. Are they talking about load-balancing to
different databases, or different servers in WLS. from a servlet or from a
client side app?
Can anyone elaborate?
Thanks in advance.

hi,
without knowing the entire set of requirements or the motivation behind doing this, a few words from me
this is usually done transparently to the applications server, that is having eg. Oracle instances mirroring eachother for extreme high-availability requirements.
1. I would have taken the liberty of calling this business funcionality and let my middleware do the implementation of this. The most elegant solution would probably be to call the master DB for the CUD operation, then post a message to a queue letting the slave DB be updated asynchronously. If the message could not be sent, throw an exception and have the entire operation rolled back.
If however this must happen realtime and transactions must be consistent, there are a few points to consider. And the quieing bit would not work.
if this is something that should be done for all Create, Update and Delete operations, an intercepting JDBC driver could do the trick. Although there are all sorts of different problems that could arise from this, for starters, at least one of the DBMS involved here should be XA compliant. If the entire transaction should be XA compliant, both DBMS must be XA compliant. Next as for the transaction towards the "mirroring" DBMS you would have to do all the transaction stuff your self.
For an example of an intercepting JDBC driver, I found thisone
http://media.datadirect.com/download/docs/jdbc/jdbcref/spy.html
I would guess that there are quite a few more.
- [url http://blog.thej2eestruggle.com]Anders Mathisen
Edited by anders.mathisen at 01/21/2007 2:53 PM

ACE 4710 and load balancing with sticky cookie

Configuring load balancing with SSL termination and stickiness for a couple of citrix xenapp servers. I'm doing a source-NAT as the ACE resides in the DMZ and these particular servers reside on the inside arm of the firewall. The ACE is in bridged mode to load balance web servers that reside in the DMZ. Everything seems to work just fine, but the cookie stickiness does not seem to be working.

Hi David,
As you may know, using Wireshark to look at an HTTPS capture is only useful if you've installed the server SSL key.This is why I find it easier to use something like LiveHTTPHeaders or HTTPWatch.
When using cookie-insert, the ACE will not create any dynamic cookie entries. It will simply create one static entry for each rserver with a cookie value, such as R3911631338, and any client that gets load balanced to that rserver will receive a cookie with that value. So what you see there is what is expected.
You are correct in that when using location cookies that the server supplies, the ACE will create a dynamic entry when it sees the server response with the cookie. The cookie is included in the server's response, and the ACE will look for the value as configured. The cookie will also be sent to the client. If the cookie is not in the server's first response, you will need enable persistence-rebalance so that it will look in subsequent server responses. If the browser opens new connections with that cookie, then the ACE will stick to the same server.
My suggestion would be to get sticky working with cookie-insert first. Then if that meets your needs, go with that permanently. If you need to use server cookies, then once cookie insert is working, migrate your sticky to cookie location.
Sean

Load-balancing with OCI connections

Gurus,
Oracle Identity Federation (OIF) can leverage an Oracle database as its transient data store in which case it uses JDBC-OCI connections to connect. However, there is no provision in OIF of defining multiple databases for load-balancing purposes.
Is this achievable using some load-balancer in front of multiple database instances and using a virtual hostname/IP in tnsnames.ora which OIF refers to?
-Vinod

I would say that using two seperate databases (with replication)
as the backend would mean that one database, at any time,
might be lagging the other, depending on which tables are updated
and how replication is implemented.
Connect Time Failover, rather than Load Balancing, might be an
implementation -- to handle Instance Failure (eg node / site has gone down).
Instead of Load Balancing.
Load Balancng between two seperate databases would be usable
if you are sure that either of
a. The underlying data doesn't change
OR
b. The application and users are aware that they might see different data
if there ARE changes to the data, not yet synchronised between the two DBs.

HTTP Tunneling and Load Balancing with Weblogic Server 6.1

We use T3 for Java client to application server communication (Weblogic Server
6.1) and keep the session open for the life of the client. We many customers
using this with load balancers and all works fine. We have just started to use
BEA's HTTP tunneling and I have a question concerning how this will work with
load balancers. Since the single T3 connection has been replaced with a series
of stateless HTTP connections, does the BEA tunneling code put session information
in the HTTP header? If so, what information does it place in the header. If
it does we should be able to use that to make sure that the load balancer always
sends HTTP requests with that session to the same application server.
Thanks!
Rick

Rick,
You may want to look at the Alteon and F5 configuration we have on edocs.
Take a look at the following URLs for a possible solution
http://edocs.bea.com/wls/docs61/cluster/alteon.html#591902
http://edocs.bea.com/wls/docs61/cluster/bigip.html#591902
Chuck Nelson
DRE
BEA Technical Support

2 App servers in farm will be auto failover and load balanced?

Dear all,
We are going to setup following SharePoint farm:
2 WFE
2 APP
2 OWA
2 SQL with shared NAS
We will have hardware load balance in front of 2 WFE. From my understanding, the 2 WFE will detect which APP server is available and send the request there.
Hence, if APP1 is down, all traffic come from both WFE will be directed to APP2.
But I am not so sure about the part about load balance. If all the 8 server instance are working properly, the new request come from WFE2 will be sent to APP1 or APP2? Or it depends on which service application is asking?
In addition, we planned to run all search components on APP servers. But the 2 APP servers are both 16GB memory which is lower than suggested specification. I am considering whether I can assign all the search workload on APP2 while all the other on
APP1.
Thanks.
Mark

Here is a good artcicle on how SharePoint load balances service applications:
http://blogs.msdn.com/b/dtaylor/archive/2011/02/23/sharepoint-2010-service-application-load-balancer.aspx
Yes you can create APP02 as search server but then service apps will not be redundant , so it would be better to run all the service apps on both the servers and if you see any memory issues, then scale it later.
As per
http://technet.microsoft.com/en-us/library/651dba4d-8751-4bd8-9492-f2842b2e1177(v=office.15)#HW_Enterprise , 16 GB is recommended for application server so i think you should be okay unless there is very high load .
Amrita Talreja

VPN device with dual ISP, fail-over, and load balancing

We currently service a client that has a PIX firewall that connects to multiple, separate outside vendors via IPSEC VPN. The VPN connections are mission critical and if for any reason the VPN device or the internet connection (currently only a T1) goes down, the business goes down too. We're looking for a solution that allows dual-ISP, failover, and load balancing. I see that there are several ASA models as well as the IOS that support this but what I'm confused about is what are the requirements for the other end of the VPN, keeping in mind that the other end will always be an outside vendor and out of our control. Current VPN endpoints for outside vendors are to devices like VPN 3000 Concentrator, Sonicwall, etc. that likely do not support any type of fail-over, trunking, load-balancing. Is this just not possible?

Unless I am mistaken the ASA doesn't do VPN Load Balancing for point-to-point IPSec connections either. What you're really after is opportunistic connection failover, and/or something like DMVPN. Coordinating opportunistic failover shouldn't be too much of an issue with the partners, but be prepared for lot of questions.

Reverse Proxy and Load Balancer for SMP 2.3 and Agentry Application

Hi Expert,
I'm putting in place a mobile solution composed by SMP 2.3 SPS 4 and SAP ECC 6.0. In the SMP 2.3 I created the agentry server and I have deployed my agentry application.
My SMP/Agentry infrastructure is composed by two servers therefore I need a load balancer for balance the load into the several servers. Furthermore I need to use a reverse proxy in my DMZ zone.
Based on what indicated in the SAP note "1904213 - SAP Mobile Platform Server Release Information" the Apache Reverse Proxy is not supported for Agentry clients. Agentry uses nginx for Reverse Proxy.
I also found the following document How-to-Guide for Reverse Proxy and Load Balancing in SAP Mobile Platform 3.x that explain how to set-up a reverse proxy and load balancer with nginx and apache.
Both the SAP note and the HOW to document are refereed to SMP 3.0 and not to SMP 2.3.
I would know if the NGINX must be used also for SMP 2.3.
Any suggestion/information is appreciated.
Thanks in advance
g.

Please see Agentry Network Landscapes

Cache and Load Balancing for the Oracle APEX Listener

Hi,
I intend to use only HTTP access.
My database is Oracle 11gR2, SE, 32 bit.
How to implement a Cache and Load Balancing with the Oracle APEX Listener?
Is it possible to do with the the standalone running APEX Listener?
Thanks by advance for any tips/documentation/references.
Kind Regards.

Error. To be closed.

Cache and Load Balancing for Oracle APEX Listener

Hi,
I intend to use only HTTP access.
The database I use is Oracle11gR2 SE 32bit.
How to implement a Cache and Load Balancing with the Oracle APEX Listener?
Is it possible to do with the the standalone running APEX Listener?
Thanks by advance for any tips/documentation/references.
Kind Regards.

Error. To be closed.

Problem with creating Connection pool and JNDI, driver is not detected

Hi,
I have an issue with creating Connection Pool and JNDI.
I'm using:
- JDK 1.6
- OS: Linux(ubuntu 8.10)
- Netbeans IDE 6.5.1
- Java EE 5.0
- Apache Tomcat 6.0.18 Its lib directory contains all necessary jar files for Oracle database driver
- Oracle 11g Enterprise
My problem is that the Oracle database driver is not detected when I want to create a pool (it works pretty well and is detected without any problem when I create ordinary connection by DriverManager)
Therefore after running:
InitialContext ic = new InitialContext();
Context context = (Context)ic.lookup("java:comp/env");
DataSource dataSource = (DataSource)context.lookup("jdbc/oracle11g");
Connection connection = dataSource.getConnection();and right after dataSource.getConnection() I have the following exception:
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'oracle.jdbc.OracleDriver'
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1136)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at servlets.Servlet1.doPost(Servlet1.java:47)
at servlets.Servlet1.doGet(Servlet1.java:29)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: oracle.jdbc.OracleDriver
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1130)
... 17 more
My application context file (context.xml) is:
<?xml version="1.0" encoding="UTF-8"?>
<Context path="/WebApplication3">
<Resource auth="Container"
                  driverClassName="oracle.jdbc.OracleDriver"
                  maxActive="8"
                  maxIdle="4"
                  name="jdbc/oracle11g"
                  username="scott"
                  password="tiger"
                  type="javax.sql.DataSource"
                  url="jdbc:oracle:thin:@localhost:1521:database01" />
</Context>and my web.xml is:
    <resource-ref>
        <description>Oracle Datasource example</description>
        <res-ref-name>jdbc/oracle11g</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
    </resource-ref>
...I found similar threads in different forums including sun, such as
http://forums.sun.com/thread.jspa?threadID=567630&start=0&tstart=0
http://forums.sun.com/thread.jspa?threadID=639243&tstart=0
http://forums.sun.com/thread.jspa?threadID=5312178&tstart=0
, but no solution.
As many suggest, I also tried to put context directly in the server.xml (instead of my application context) and referencing it by <ResourceLink /> inside my application context but it didn't work and instead it gave me the following message:
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '   ' for connect URL 'null'
Has anyone succeeded in creating a connection pool with JNDI by using Tomcat 6 or higher ? If yes, could kindly explain about the applied method.
Regards,

Hello again,
Finally I managed to run my application also with Tomcat 6.0.18. There was only two lines that had to be modified
in the context.xml file (the context of my application project and not server's)
Instead of writing
<Context antiJARLocking="true" path="/WebApplication2">
    type="javax.sql.DataSource"
    factory="org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory"
</Context>we had to write:
<Context antiJARLocking="true" path="/WebApplication2">
    type="oracle.jdbc.pool.OracleDataSource"
    factory="oracle.jdbc.pool.OracleDataSourceFactory"
</Context>- No modification was needed to be done at server level (niether server.xml nor server context.xml)
- I just added the ojdbc6.jar in $CATALINA_HOME/lib (I didn't even need to add it in WEB-INF/lib of my project)
- The servlet used to do the test was the same that I presented in my precedent post.
For those who have encountered my problem and are interested in the format of the web.xml and context.xml
with Tomcat 6.0, you can find them below:
Oracle server: Oracle 11g Enterprise
Tomcat server version: 6.0.18
Oracle driver: ojdbc.jar
IDE: Netbeans 6.5.1
The context.xml file of the web application
<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/WebApplication2">
    <Resource name="jdbc/oracle11g"
              type="oracle.jdbc.pool.OracleDataSource"
              factory="oracle.jdbc.pool.OracleDataSourceFactory"
              url="jdbc:oracle:thin:@localhost:1521:database01"
              driverClassName="oracle.jdbc.OracleDriver"
              userName="scott"
              password="tiger"
              auth="Container"
              maxActive="100"
              maxIdle="30"
              maxWait="10000"
              logAbandoned="true"
              removeAbandoned="true"
              removeAbandonedTimeout="60" />
</Context>The web.xml of my web application
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <resource-ref>
        <description>Oracle Database 11g DataSource</description>
        <res-type>oracle.jdbc.pool.OracleDataSource</res-type>
        <res-auth>Container</res-auth>
        <res-ref-name>jdbc/oracle11g</res-ref-name>
    </resource-ref>
    <servlet>
        <servlet-name>Servlet1</servlet-name>
        <servlet-class>servlets.Servlet1</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Servlet1</servlet-name>
        <url-pattern>/Servlet1</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>Ok, now I'm happy as the original problem is completely solved
Regards

How does failover and load distribution work in Operations Manager resource pools?

Hello everyone,
I have a couple of questions in regard to failover and load distribution in resource pools.
What is the criteria for an x-plat or network device to initiate a failover?
How is load distributed in a resource pool - Is it round-robin, performance based or something completely different?
In case more than two management servers are in the same pool, and a management server becomes unavailable, how is load distributed among the remaining resource pool members?
Any help is appreciated.
Thx,
Claus

Hi,
Resource Pools are a collection of Health Services working together to manage instances assigned to the pool.
Workflows targeted to the instances are loaded by the Health Service in the Resource Pool that ends up managing that instance.
If one of the Health Services in the Resource pool were to fail, the other Health Services in the pool will pick up the work that the failed member was running.
And I would like to share this article with you. Hope it helps.
http://www.systemcentercentral.com/how-does-the-failover-process-work-in-opsmgr-2012-scom-sysctr/
Niki Han
TechNet Community Support

Cisco 2811 Router with 3 ADSL card and load balancing

Dear All,
I have few queries:
1. Does Cisco 2811 Router support 3 ADSL card?
2. We are the ISP. I want to do load balancing with 3 dsl
line on Cisco 2811 Router.
Please send me the linke for this configuration.
Thanks/Regards
Atul

hi
In 2811 you have 4 HWIC and 1 NME you can install 1-port ADSL WAN Interface Cardon the HWIC slots.
Also just enable 3 default (equal cost) routes towards the interfaces which will take care of the load balancing.
if you need more info and inputs do post out with ur requirements along with network topology in place at present..
regds

Clustering problems and load balancing question

          I am using Weblogic 6.1. My Windows NT environment consists of 10 web client-simulator
          machines, 2 App. Server machines and one database server machine. I have defined
          one cluster on each app. server. Each cluster is running 3 Weblogic instances, or
          so it should be when I fix my problems!
          My questions/problems are the following:
          1. Can I use a software dispatcher to perform workload balancing between the 2 weblogic
          clusters? That is, the client-simulator machines send the requests to the software
          dispatcher which performs workload balancing between the 2 Weblogic clusters. The
          clusters perform round-robin amongst all instances. Note that the documentation only
          talks about Hardware Balancing.
          2. I am having problems with my multicast IP addresses. For instance, on one App.
          Server machine, I am using the multicast IP address: 239.0.0.1 for MyCluster. When
          I start the Admin Server, I get a JDBC error: "... multicast socket error: Request
          Time Out". I have used the utils.MulticastTest utility which shows the packets not
          being received:
          I (S1) sent message num 1
          I (S1) sent message num 2
          I (S1) sent message num 3
          I (S1) sent message num 4
          What am I doing wrong?
          3. Re. the cluster configuration:
          NOTE: I have executed my workload using 2 independent App. Server machines with a
          software dispatcher - no clustering. Each App. Server used a jdbc connection pool
          of 84 database connections. The db connections happened to become my bottleneck.
          When I tried to increase the number of connections in the jdbc pool, throughput decreased
          dramatically. Thus, I decided to add a cluster of Weblogic instances to each one
          of my 8 x 900Mhz machines in order to scale up. Unfortunatly, adding clusters have
          not been that simple a task - probably because I am totally new to the Web Application
          Server world!
          Here is what I've got so far:
          I have obtained 3 static IP addresses for the 3 instances of Weblogic instances that
          I wish to run within the cluster. All servers in the cluster use port number 80.
          There is a corresponding DNS entry for each IP address. My base assumption is that
          one of these instances will double up as the Administration Server... Is it true,
          or do I need to define a separate Admin server if I wish to run 3 Weblogic instances
          (each with a connection pool of 84 database connections for a total of 252 database
          connections)?
          Do I need to re-deploy my applications for the cluster? And if so, would this explain
          why I am having problem starting my Admin Server?
          I think this is it for now. Any help will be greatly appreciated!
          Thanks in advance,
          Guylaine.


          Guylaine Cantin wrote:
          > I am using Weblogic 6.1. My Windows NT environment consists of 10 web client-simulator
          > machines, 2 App. Server machines and one database server machine. I have defined
          > one cluster on each app. server. Each cluster is running 3 Weblogic instances, or
          > so it should be when I fix my problems!
          >
          > My questions/problems are the following:
          >
          > 1. Can I use a software dispatcher to perform workload balancing between the 2 weblogic
          > clusters? That is, the client-simulator machines send the requests to the software
          > dispatcher which performs workload balancing between the 2 Weblogic clusters. The
          > clusters perform round-robin amongst all instances. Note that the documentation only
          > talks about Hardware Balancing.
          >
          We also support software load balancers (for e.g. resonate)
          The software dispatcher should be intelligent enough to decode the
          cookie and route the request to the appropriate servers. This is
          necessary to maintain sticky load balancing.
          > 2. I am having problems with my multicast IP addresses. For instance, on one App.
          > Server machine, I am using the multicast IP address: 239.0.0.1 for MyCluster. When
          > I start the Admin Server, I get a JDBC error: "... multicast socket error: Request
          > Time Out". I have used the utils.MulticastTest utility which shows the packets not
          > being received:
          >
          > I (S1) sent message num 1
          > I (S1) sent message num 2
          > I (S1) sent message num 3
          > I (S1) sent message num 4
          > ...
          >
          > What am I doing wrong?
          >
          You should run the above utility from multiple windows and see if each
          of them being recognized or not.
          i.e. java utils.MulticastTest -N S1 -A 239.0.0.1
          java utils.MulticastTest -N S1 -A 239.0.0.1
          > 3. Re. the cluster configuration:
          >
          > NOTE: I have executed my workload using 2 independent App. Server machines with a
          > software dispatcher - no clustering. Each App. Server used a jdbc connection pool
          > of 84 database connections. The db connections happened to become my bottleneck.
          > When I tried to increase the number of connections in the jdbc pool, throughput decreased
          > dramatically. Thus, I decided to add a cluster of Weblogic instances to each one
          > of my 8 x 900Mhz machines in order to scale up. Unfortunatly, adding clusters have
          > not been that simple a task - probably because I am totally new to the Web Application
          > Server world!
          >
          You have to stress test your application several times and set
          maxCapacity of the conn pool accordingly.
          > Here is what I've got so far:
          >
          > I have obtained 3 static IP addresses for the 3 instances of Weblogic instances that
          > I wish to run within the cluster. All servers in the cluster use port number 80.
          > There is a corresponding DNS entry for each IP address. My base assumption is that
          > one of these instances will double up as the Administration Server... Is it true,
          > or do I need to define a separate Admin server if I wish to run 3 Weblogic instances
          > (each with a connection pool of 84 database connections for a total of 252 database
          > connections)?
          BEA recommends to use Admin server for administrative tasks only
          like configuring new deployments, jdbc conn pools, adding users etc..
          It's not a good idea to have admin server part of cluster.
          >
          > Do I need to re-deploy my applications for the cluster? And if so, would this explain
          > why I am having problem starting my Admin Server?
          >
          You have to target all your apps to the Cluster.
          > I think this is it for now. Any help will be greatly appreciated!
          >
          > Thanks in advance,
          >
          > Guylaine.
          >

Failover and Load Balancing with JNDI Connection Pools

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