There is an out of the box Enterprise Manager job that runs every day and gets the latest patch information from My Oracle Support (MOS). This job is important for you to receive timely notification of critical patch advisories and other patches from Oracle.
You can check to see if this job is scheduled and running by going to Enterprise | Job | Activity and selecting Advanced Search. Then select the job type as Refresh From My Oracle Support and set Scheduled Start to Last 7 days.
This displays all the out of the box refreshed jobs that have run and are scheduled for the future.
If there is a requirement to set up your own refresh job (for example if you would like the MOS patch recommendations for your databases to be refreshed immediately ...