9.4.2 Handling Large Volumes of Concurrent Connection Requests

If you expect the listener to handle large volumes of concurrent connection requests, then you can specify a listener queue size for its TCP/IP or IPC listening endpoints.

To specify the listener queue size, do the following:

• Specify the QUEUESIZE parameter at the end of the protocol address with its value set to the expected number of concurrent requests.

  The following example sets the queue size to 20:

  LISTENER=
   (DESCRIPTION=
    (ADDRESS=(PROTOCOL=tcp)(HOST=sales-server)(PORT=1521)(QUEUESIZE=20)))

  Note:

  The default number of concurrent connection requests is operating system-specific. The defaults for TCP/IP on the Linux operating system and Microsoft Windows follow:

  • Linux operating system: 128

  • Microsoft Windows XP Professional SP2: 10

  • Microsoft Windows Server Enterprise Edition: 200