Multiple session logs in informatica powercenter

Informatica powercenter v8+ gives us the power to keep session logs for more than one session runs. This feature of Informatica
helps in safe keeping logs for analysis according to a customizable retention window. In Powercenter Workflow Manager > Tasks > Session Configuration > default_session_config, edit the session config object and goto properties tab.
There in section, Save session log count can be set to a value that is equal to the number of session logs to be kept in the informatica server.

$PMSessionLogCount can also be used to set a value as specified by the parameter value.We can also set this value in a specific session, in config tab of session.