Starting RMGR
Before you can use RMGR to perform recovery management tasks, it must be started in the operating system.
In a production environment, RMGR is usually set up to start automatically (through a started task or batch job) and remains running at all times. In a test environment, you may need to issue the command or submit the JCL to start RMGR.
You can recycle RMGR without recycling IMS, and you can recycle IMS without recycling RMGR. Whenever you change the IMS release (upgrade to a new release or fall back to a previous release), you should recycle RMGR. In the same way, whenever you change the RMGR release, you should recycle IMS.
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