Weblogic all topics simplified

 Cluster creation

Under Domain Structure, expand Environment, click Clusters, and then select Cluster from the New list on the Clusters table. 

On the Create a New Cluster page, enter cluster1 for the name, select Unicast for the messaging mode, 

leave Unicast Broadcast Channel blank, and then click OK.

Types of the clusters

Horizontal clustering, sometimes referred to as scaling out, is adding physical machines to increase the performance or capacity of a cluster pool. ... 

Vertical clustering, sometimes referred to as scaling up, is adding Application Server instances to the same machine.

Horizontal cluster process

while creating a domain after configuring managed servers we have to add managed servers in a cluster.

the turning point for horizontal clustering is to Create two machines ( usually create it with the name of machines, suppose you ant clustering between to machines with hostname like hostname1.something.com & hostname2.something.com, then create machine names like hostname1 & hostname2 )

Enter listen to the address of the particular machine ( server ), like for mac1 enter listen to address of      hostname1.something.com & for mac2, enter listen to address of hostname2.something.com )

      

  Enter the port for nodemanager


Assign MS1 & MS2 to mac1 & MS3 & MS4 to Mac2, this will allow nodemanager 

to start managed  server 1 & 2 on machine1 ( hostname1.something.com ) and 

start managed server 3 & 4 on machine 2 (  hostname2.something.com )

and then click on create 


config.xml file

config.xml is the central configuration repository for a domain. every resource you have configured from the admin console or by command line or by any other tool registered under this file.

Datasources

Multi Datasource: 

Abstraction around data source to provide load balancing or failover for data sources that are part of Multi Datasource

Grid Link data source

A single GridLink data source provides connectivity between WebLogic Server and an Oracle Database service targeted to an Oracle RAC cluster. 

It uses the Oracle Notification Service (ONS) to adaptively respond to state changes in an Oracle RAC instance

Generic Datasource

Generic data sources provide database access and database connection management. Each data source contains a pool of database connections that are created when the data source is created and at server startup.


Deployment descriptor

A deployment descriptor (DD) refers to a configuration file for an artifact that is deployed to some container/engine.

 In the Java Platform, Enterprise Edition, a deployment descriptor describes how a component, module, or application (such as a web application or enterprise application) should be deployed.

Garbage collection

"garbage collection" is the process of clearing "dead" objects from the heap, thus releasing that space for new objects. 

 

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