Verbose sshd pam messages in /var/log/messages

[Yong Huang]

/var/log/messages is full of messages as follows (I omitted the beginning
part of the lines, which is time and hostname):

sshd(pam_unix)[2478]: session closed for user oracle
sshd(pam_unix)[2885]: session opened for user oracle by (uid=0)

But I wonder if there's a way to not record logins by this particular,
oracle. (Other logins are fine.) Thanks.

Yong Huang