Checkpoints on IBM MQ for IBM i

Checkpoints are taken at various times to provide a known consistent start point for recovery.

The checkpoint process AMQALMPX is responsible for taking the checkpoint at the following points:

• Queue manager startup (STRMQM).
• Queue manager shutdown (ENDMQM).
• After a period of time has elapsed since the last checkpoint (the default period is 30 minutes) and a minimum number of log records have been written since the previous checkpoint (the default value is 100).
• After a number of log records have been written. The default value is 10 000.
• After the journal threshold size has been exceeded and a new journal receiver has been automatically created.
• When a full media image is taken with:

  RCDMQMIMG OBJ(*ALL) OBJTYPE(*ALL) MQMNAME(Q_MGR_NAME) DSPJRNDTA(*YES)