One of the features we support in Oracle Utilities Application Framework V4.3.x and above is the Oracle WebLogic Overload Protection feature. By default, Oracle WebLogic is setup with a global Work Manager which gives you unlimited connections to the server. Whilst this is reasonable for non-production systems, Oracle generally encourages people to limit connections in Production to avoid overloading the server with connections.
In production, it is generally accepted that the Oracle WebLogic servers will either be clustered or a set of managed servers, as this is the typical setup for the high availability requirements for that environment. Using these configurations,it is recommended to set limits on individual servers to enforce capacity requirements across your cluster/managed servers.
There are a number of recommendations when using Overload Protection:
- The Oracle Utilities Application Framework automatically sets the panic action to system-exit. This is the recommended setting so that the server will stop and restart if it is overloaded. In a clustered or managed server environment, end users are routed to other servers in the configuration while the server is restarted by Node Manager. This is set at the ENVIRON.INI level as part of the install in the WLS_OVERRIDE_PROTECT variable. This variable is set using the WebLogic Overload Protection setting using the configureEnv utility.
- Ensure you have setup a high availability environment either using Clustering or multiple managed servers with a proxy (like Oracle HTTP Server or Oracle Traffic Director). Oracle has Maximum Availability Guidelines that can help you plan your HA solution.
- By default, the product ships with a single global Work manager within the domain (this is the default domain from Oracle WebLogic). It is possible to create custom Work Manager definitions with Capacity Constraint and/or Maximum Threads Constraint which is allocated to product servers to provide additional capacity controls.