O121-C2-019100 - The DBMS must protect against or limit the effects of organization-defined types of Denial of Service (DoS) attacks.
A variety of technologies exist to limit, or in some cases, eliminate the effects of DoS attacks. For example, boundary protection devices can filter certain types of packets to protect devices on an organization's internal network from being directly affected by DoS attacks. Employing increased capacity and bandwidth combined with service redundancy may reduce the susceptibility to some DoS attacks. Some of the ways databases can limit their exposure to DoS attacks are through limiting the number of connections that can be opened by a single user and database clustering.
Implement measures to limit the effects of organization-defined types of Denial of Service attacks. Modify the $ORACLE_HOME/network/admin/listener.ora to establish a Rate Limit.