To optimize performance, configure the queue destination
properties to best fit your message-driven bean (MDB) or other applications
that use the queue destinations.
For example:
- When MDB applications are configured to queues on WebSphere® MQ
for z/OS®, the INDEX by MSGID is very important.
- Setting the Expiry property to SPECIFIED and the Specified Expiry
property to 30000 milliseconds for the expiry timeout, reduces the
number of messages that can be queued.
To ensure that there are enough underlying WebSphere MQ
resources available for the queue, you must ensure that you configure
the queue destination properties adequately for use by your message-driven
beans or other applications that use the queue.
You should also consider queue attributes of the internal JMS server
that are associated with the queue name. Inappropriate queue attributes
can reduce the performance of WebSphere operations.
You should also consider the queue attributes associated with the
queue name you created with WebSphere MQ. Inappropriate
queue attributes can reduce the performance of WebSphere operations.
You can use WebSphere MQ commands to change queue attributes
for the queue name.
- BOQNAME
- The excessive backout requeue name. This can be set to a local
queue name that can hold the messages that were rolled back by the WebSphere applications. This queue name
can be a system dead letter queue.
- BOTHRESH
- The backout threshold and can be set to a number once the threshold
is reached, the message will be moved to the queue name specified
in BOQNAME.
- INDXTYPE
- Set this to MSGID. This causes an index of message identifiers
to be maintained, which can improve WebSphere MQ
retrieval of messages.
- DEFSOPT
- Set this to SHARED (for shared input from the queue).
- SHARE
- This must be specified (so that multiple applications can get
messages from this queue).
For more information about using these properties, see the following
sections of the
WebSphere MQ information
center:
- For BOQNAME and BOTHRESH, see "Handling poison messages" in
the Using Java
- Script (MQSC) Command Reference