Fast communications manager (Windows)

In multiple member environments, each member has a pair of FCM daemons to support communication between members that is related to agent requests. One daemon is for sending communications, and the other is for receiving. These daemons and supporting infrastructure are activated when an instance is started. FCM communication is also used for agents working within the same member; this type of communication is also known as intra-member communication.

You can specify the number of FCM message buffers with the fcm_num_buffers database manager configuration parameter. You can also specify the number of FCM channels with the fcm_num_channels database manager configuration parameter. The fcm_num_buffers and fcm_num_channels database manager configuration parameters are set to AUTOMATIC as the default value. The FCM monitors resource usage when any of these parameters are set to automatic, and incrementally releases resources. It is recommended to leave these parameters set to AUTOMATIC.