As part of your backup strategy, take care of your journal receivers. It is useful to remove journal receivers from the WebSphere MQ libraries, in order to:
Before deleting a journal receiver, be sure that:
Journal receivers can be removed from the queue manager library after they have been detached from the journals and saved, provided that they are available for restoration if needed for a recovery operation.
The concept of journal management is shown in Figure 12.
It is important to know how far back in the journals WebSphere MQ is likely to need to go, in order to determine when a journal receiver that has been backed up can be removed from the queue manager library, and when the backup itself can be discarded.
To help determine this time, WebSphere MQ issues two messages to the queue manager message queue (QMQMMSG in the queue manager library) when:
These messages are:
The journal receiver identified is the oldest one required. Any other WebSphere MQ journal receivers with older creation dates are no longer needed. If only stars are displayed, you need to restore backups from the date indicated to determine which is the oldest journal receiver.
When these messages are logged, WebSphere MQ also writes a user space object to the queue manager library that contains only one entry: the name of the oldest journal receiver that needs to be kept on the system. This user space is called AMQJRNINF, and the data is written in the format:
JJJJJJJJJJLLLLLLLLLLYYYYMMDDHHMMSSmmm
where:
When the oldest journal receiver has been deleted from the system, this user space contains asterisks (*) for the journal receiver name.
WebSphere MQ for iSeries does not refer to the journal receivers unless it is performing a recovery pass either for startup, or for recreating an object. If it finds that a journal it requires is not present, it issues message AMQ7432 to the queue manager message queue (QMQMMSG), reporting the time and date of the journal entry it requires to complete the recovery pass.
If this happens, restore all journal receivers that were detached after this date from the backup, in order to allow the recovery pass to succeed.
Keep the journal receiver that contains the startup entry, and any subsequent journal receivers, available in the queue manager library.
Keep the journal receiver containing the oldest Media Recovery Entry, and any subsequent journal receivers, available at all times, and either present in the queue manager library or backed-up.
When you force a checkpoint:
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