Sybase 12.4.2 - Manual (Page 104)

How Adaptive Server IQ makes connections
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Server name caching for faster connections
The network library looks for a database server on a network by broadcasting
over the network using the
CommLinks connection parameter.
Tuning the broadcast The CommLinks parameter takes as argument a string that lists the protocols to
use and, optionally for each protocol, a variety of network communication
parameters that tune the broadcast.
For a complete listing of network communications parameters, see Chapter 3,
“Connection and Communication Parameters” in the Adaptive Server IQ
Reference Manual.
Caching server
information Broadcasting over large networks to search for a server of a specific name can
be time-consuming. To speed up network connections (except for the first
connection to a server), when a server is located, the protocol it was found on
and its address are saved to a file.
The server information is saved in a file named asasrv.ini, in your Adaptive
Server IQ executable directory. The file contains a set of sections, each of the
following form:
[Server name]
Link=protocol_name
Address=address_string
How the cache is
used When a connection specifies a server name, and a server with that name is not
found, the network library looks first in the server name cache to see if the
server is known. If there is an entry for the server name, an attempt is made to
connect using the link and address in the cache. If the server is located using
this method, the connection is much faster, as no broadcast is involved.
If the server is not located using cached information, the connection string
information and
CommLinks parameter are used to search for the server using
a broadcast. If the broadcast is successful, the server name entry in the named
cache is overwritten.
Note If a server name is held in the cache, the cache entry is used before the
CommLinks string.