Automatic restart while upgrade

Hello,

I discovered that while upgrading PostgreSQL binaries through 'yum
update', with PGDG RPMs, the service is automatically restarted.

ISTM that this was not the case before 9.2.

May you confirm that this is a new behaviour appearing in 9.2?

Is it intended, and is there a way to prevent the automatic restart?

Thanks in advance.

Best regards,
Stéphane Schildknecht
http://loxodata.com