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WebSphere Commerce Dynacache, the main concepts

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The WebSphere Dynacache- the main tool WebSphere integrates for caching strategies- can be imagined like an HashTable stored in the JVM Heap, with disk offload options and rules defined for retrieve and invalidate objects. In addition, Dynacache is supported in a cluster environment using the Distribute Replication Service- DRS.

Improving performances

There are three main area where we can work in order to improve the performances- in terms of cache:

  1. Java Data Objects
  2. Java Commands (WebServices, POJOs and EJBs)
  3. HTTP responses

Data Objects and Commands caches are items defined in Object Cache Instances. Instead HTTP Responses caches are defined in Servlet Cache Instances.

Let's have a look at the most important one: Object Cache, also called WebSphere Commerce data cache.

WebSphere Commerce data cache

The data cache objects can persist across multiple transactions (cross transaction cache) or not (local transaction cache) according to the assigned configuration. In addition, the cached objects can be distributed in different and planned instances (distributed map caching approach) or defined in the Base cache instance (command caching using cachespec.xml).

 

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