Operating Systems: i5/OS
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Task overview: Using the dynamic cache service to improve performance
Caching the output of servlets, commands, and JavaServer Pages
improves application performance. WebSphere Application Server consolidates
several caching activities including servlets, Web services, and WebSphere
commands into one service called the dynamic cache. These caching activities
work together to improve application performance, and share many configuration
parameters that are set in the dynamic cache service of an application server.
You can use the dynamic cache to improve the performance of servlet and JSP
files by serving requests from an in-memory cache. Cache entries contain servlet
output, the results of a servlet after it runs, and metadata.
Overview
The dynamic cache service works within an application server Java
virtual machine (JVM), intercepting calls to cacheable objects. For example,
it intercepts calls through a servlet service method or a command execute
method, and either stores the output of the object to the cache or serves
the content of the object from the dynamic cache.
Procedure
- Enable the dynamic cache service globally. To use the
features associated with dynamic caching, enable the service in the
administrative console. See Enabling the dynamic cache service for more information.
- Configure the type of caching that you are using:
- Monitor the results of your configuration using the dynamic cache
monitor. For more information, see Displaying cache information.
What to do next
To use the DistributedMap and DistributedObjectCache interfaces for
the dynamic cache, see Using the DistributedMap and DistributedObjectCache interfaces for
the dynamic cache.
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Disk cache infrastructure enhancements
Enabling the dynamic cache service
Configuring cache replication
Configuring cacheable objects with the cachespec.xml file
Configuring command caching
Eviction policies using the disk cache garbage collector
Example: Caching Web services
Configuring the Web services client cache
Displaying cache information
Using the DistributedMap and DistributedObjectCache interfaces for
the dynamic cache
Using servlet cache instances
Disabling template-based invalidations during JSP reloads
Dynamic cache MBean statistics
Example: Configuring the dynamic cache service
Dynamic cache PMI counter definitions
Troubleshooting the dynamic cache service
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