As mentioned by John Q:-
"2012-07-30 09:49:30.712 THREAD 6707 SEVERE: Unexpected server error. in: com.sygate.scm.server.task.SecurityAlertNotifyTask
java.sql.SQLException: There is insufficient system memory in resource pool 'internal' to run this query.
com.sygate.scm.server.util.ServerException: Unexpected server error."
If you are using SQL Server 2008, please refer to this article:
http://support.microsoft.com/kb/982854
As suggested previously, try to increase RAM available on SQL Server. It might be worth also to reduce the size of the database, by decreasing number of logs to keep (Admin > Server > Local Site Properties > Log settings). Moreover, as NotifyTask is related to notifications, I would recommend you to temporarely disable all your notifications/scheduled reports.
If you are using Small Business edition with Embedded database, please upgrade to 12.1 RU1 MP1 in order to fix a problem with Transaction log (see defect 2660649 inhttp://www.symantec.com/docs/TECH187656).
To upgrade: http://www.symantec.com/docs/TECH187753