<snip>
and the LNKLST UPDATE JOB(*) is documented as potentially dangerous.
</snip>

If you're lucky, nothing bad will happen. If you're really unlucky, you 
will trash your system. And all sorts of variants in between.
The operation is unpredictably dangerous. The effects depend on what 
happens to be going on at the time.

If you use it, you will get no sympathy (or support) if something bad 
happens. The only safe thing to do is not to use that option.
New jobs and new address spaces will use the newly activated LNKLST 
without this option. 

You might check out the DELAY sub-option of LNKLST UPDATE. There is no way 
of knowing how long might be necessary to delay before the system is to 
clean up. And the command will not complete until the delay ends. 

Why is it provided at all? Because sometimes you're willing to take a risk 
if your only choice is re-IPL.

Peter Relson
z/OS Core Technology Design


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