You can optimize performance
of message-driven bean (MDB)
or other applications that use the WebSphere® MQ messaging provider by configuring
the properties of WebSphere MQ messaging
provider destinations.
About this task
To optimize performance, configure queue and
topic destination properties in WebSphere Application Server and WebSphere MQ to best fit your applications.
Procedure
- To optimize performance for WebSphere MQ queues, 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®,
INDEX by MSGID, where the queue manager maintains an index of message
identifiers, is very important. For further information, see "Type
of index" in the Developing Applications section of
the WebSphere MQ information center.
- Setting the Expiry property to SPECIFIED and the Specified Expiry
property to 30000 milliseconds for the expiry timeout for the WebSphere MQ messaging provider queue
in WebSphere Application Server reduces
the number of messages that can be queued.
- To ensure that
there are enough underlying WebSphere MQ resources
available for
the queue, ensure that you configure the queue destination properties
in WebSphere Application Server adequately
for use by your message-driven beans or other applications that use
the queue.
- 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
attribute 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 when the threshold
is reached, the message is moved to the queue name specified in BOQNAME.
- INDXTYPE
- Set this attribute to MSGID
to cause an index of message identifiers
to be maintained, which can improve WebSphere MQ retrieval of messages.
- DEFSOPT
- Set this attribute to SHARED
(for shared input from the queue).
- SHARE
- This attribute must be specified (so that multiple applications
can get messages from this queue).
For more
information about using these properties,
see the Script (MQSC) Command Reference section of the WebSphere MQ information center. For
more information specifically about BOQNAME and BOTHRESH, see "Handling
poison messages" in the Using Java section
of the WebSphere MQ information center.
To optimize performance for WebSphere MQ topics, configure the topic
destination properties to best fit your applications. For
example: