A network listener is a system task that listens on a given network port for incoming client connections, and creates one DBMS task for each client connection. Adaptive Server creates one listener task for each network port on which Adaptive Server listens for incoming client connection requests. Initially these ports consist of the master entries in the interfaces file.
The initial number of network listener tasks is equal to the number of master entries in the interfaces file. The maximum number of network listeners (including those created at startup) is 32. For example, if there are two master entries in the interfaces file under the server name at startup, you can create 30 more listener tasks.
Each additional listener task that you create consumes resources equal to a user connection. So, after creating a network listener, Adaptive Server can accept one less user connection. The number of user connections configuration parameter includes both the number of network listeners and the number of additional listener ports.
The number of listener ports is determined at startup by the number of master entries in the interfaces file. The interfaces file entry is in the form:
SYBSRV1 master tli tcp /dev/tcp \x00020abc123456780000000000000000 query tli tcp /dev/tcp \x00020abc123456780000000000000000 master tli tcp /dev/tcp \x00020abd123456780000000000000000
This interfaces file entry includes two listener ports. For more information about the interfaces file, see Connecting to Adaptive Server in the System Administration Guide.
