In a CA IDMS DDS network configuration, several paths can exist between two nodes. The nodes can be connected using CCI, TCP/IP, or VTAM.
Using CCI
When a host node passes a database request to a target node, CCI directs the communication between the two nodes by selecting the optimum path along which to pass the request. The path selected by CCI can be a direct path between the two nodes, or, if the nodes are not directly connected, can be by way of one or more intermediate nodes.
The path selected is used to pass all application requests to the target node. If the path becomes unavailable (for example, if a telecommunications line fails or if a node in the path signs off from the network) during application execution, CCI automatically selects another available path, usually without interruption in processing.
Using TCP/IP
When using TCP/IP, the host node and the target node will have previously connected to each other. Multiple connections may exit between the two nodes; one connection is assigned for each DDS request.
Using VTAM
When using VTAM, the host node and the target node will have previously connected to each other, and the request is sent on that connection.
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