How to Make Manager Parameter Take Effect Online

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When I temporarily change the retention hour of extract tail to only 1 hour, I want it to take effect immediately.

[oracle@test dirprm]$ vi mgr.prm
..
purgeoldextracts ./dirdat/*, usecheckpoints, minkeephours 1

So I use refresh, a GGSCI command, to make it updated online.

[oracle@test dirprm]$ cd ..
[oracle@test ogg]$ ./ggsci
...
GGSCI (test) 2> refresh mgr

Sending REFRESH request to MANAGER ...
Mgr Params Updated

The manager will purge the extract trail in 10 minutes.

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