If the queue manager has terminated due to a failure, the queue manager can normally be restarted with all recovery being performed during restart. However, such recovery is not possible if any of your page sets or log data sets are not available. The extent to which you can now recover depends on the availability of backup copies of page sets and log data sets.
To restart from a point of recovery you must have:
To recover a page set to its current state, you must also have all the log data sets and records since the ARCHIVE LOG command.
There are two methods for recovering a page set. To use either method, the queue manager must be stopped.
This is the simpler method, and is appropriate for most recovery situations.
Alternatively, you can rename your backup copy to the original name, or change the CSQP00xx DD statement in your queue manager procedure to point to your backup page set. However, if you then lose or corrupt the page set, you will no longer have a backup copy to restore from.
This method provides performance advantages if you have a large page set to recover, or if there has been a lot of activity on the page set since the last backup copy was taken. However, it requires more manual intervention than the simple method, which might increase the risk of error and the time taken to perform the recovery.
Alternatively, you can rename your backup copy to the original name, or change the CSQP00xx DD statement in your queue manager procedure to point to your backup page set. However, if you then lose or corrupt the page set, you will no longer have a backup copy to restore from.
When the queue manager is restarted, it applies all changes made to the page set that are registered in the log, beginning at the restart point for the page set. WebSphere MQ can recover multiple page sets in this way. The page set is dynamically expanded, if required, during media recovery.
During restart, WebSphere MQ determines the log RBA to start from by taking the lowest value from the following:
All object definitions are stored on page set zero. Messages can be stored on any available page set.
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