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    User license limits for Z39.50

    • Article Type: General
    • Product: Aleph
    • Product Version: 18.01

    I have a few questions about the Z39.50 server.

    I see in the license that we have 25 Z39.50 users. How is the number of simultaneous users calculated, and what happens when the limit is reached?

    There are two different aspects of time counting in z39.50 server

    1. License timeout - Let’s say z39.50 server has 5 licenses (MAX-Z39-USERS in file license is equal to 5). If some z39.50 client connects to our z39.50 server it “takes” one license. So now there are only 4 free z39.50 server licenses.

    If this z39.50 client is idle (does not send any requests) for 120 seconds our z39.50 server “frees” its license. So now there are 5 free z39.50 server licenses.

    2. Z39.50 server connection timeout - Let’s say a z39.50 client connects to our z39.50 server. If z39.50 client is idle (does not send any request) Z39.50 server keeps connection for 1 hour. After that it closes the connection. Please note that this timeout does not affect license counting.

    That is if we are speaking about z39.50 license counting – the timeout is 120 seconds. If we are speaking about connection timeout – the timeout is 1 hour.

    Note: Even though the z39_server process queries the pc_server, this is not calculated as a GUI-USER for licensing purposes.

    • Article last edited: 10/8/2013