Storage classes

You are recommended to define the following six storage classes. You must define four of them because they are required by WebSphere MQ. The other storage class definitions are recommended because they are used in the sample queue definitions.

DEFAULT (required)

This storage class is used for all message queues that are not performance critical and that don't fit in to any of the other storage classes. It is also the supplied default storage class if you do not specify one when defining a queue.

NODEFINE (required)

This storage class is used if the storage class specified when you define a queue is not defined.

REMOTE (required)

This storage class is used primarily for transmission queues, that is, system related queues with short-lived performance-critical messages.

SYSLNGLV

This storage class is used for long-lived, performance-critical messages.

SYSTEM (required)

This storage class is used for performance critical, system related message queues, for example the SYSTEM.CHANNEL.SYNQ and the SYSTEM.CLUSTER.* queues.

SYSVOLAT

This storage class is used for short-lived, performance-critical messages.

We can modify their attributes and add other storage class definitions as required.