QUEUESIZE in listener.ora

QUEUESIZE refers to the number of connections that can be held by the listener. This parameter can be changed in listener.ora file. This value is limited by the maximum number of concurrent TCP/IP or IPC connections allowed by the OS.

Ex:
LISTENER=
(DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp)(HOST=host-server)(PORT=1521)(QUEUESIZE=32))

Reload the Listener to make it read the changes.

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