linux : Unlock SSH Failed Login Attempts and disable account expiration

1) unlock oracle user:
   centos 5.x
faillog -u oracle -r o

   centos 6.x
pam_tally2 -u oracle -r

pam_tally2 module is used to lock user accounts after certain number of failed ssh login attempts made to the system. This module keeps the count of attempted accesses and too many failed attempts.

2) disable account password expiration:
chage -d 0 oracle

Zamong is free oracle monitoring software with DMA method.