2. Understanding Ingres Components : General Communication Facility : Name Server : How the Name Server Works
 
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How the Name Server Works
The Name Server provides information to user processes that enables a connection to a local DBMS Server. When a process wants to connect to a remote DBMS Server:
The Name Server provides information that allows the process to first connect to a Communications Server.
The Communications Server establishes communication with the remote DBMS Server.
The Name Server checks regularly (the default is every five minutes) to ensure that all DBMS Servers on its list are functioning. If a server has shut down, the Name Server automatically deletes its registration.