IMS System Checkpoints

At regular intervals during IMS execution, checkpoints are written to the log without having to wait to do any physical I/O. A checkpoint is taken after a specified number of log records are written to the log since the previous checkpoint, or after a checkpoint command. Special checkpoint commands are available to stop IMS in an orderly manner.

Related Reading: For information about the commands that are used to stop IMS, see IMS Version 9: Operations Guide.