yum clean policy question,

Hi all,

I have small question,
Let's say about production environment, and update of software.
What is the recommendation, relay on yum metadata handling, and call
all of the time yum update -y --enablerepo=myrepo,

or to eliminate any kind of risks and to be 100% sure that update will
go smooth call additional yum clean all --enablerepo=myrepo?

what experts recommends?

thanks in advance!

-- 
Łukasz Tasz
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