![DatabaseName communication parameter [DBN]](arrow-left.gif){kind=icon}
TCP/IP (all platforms)
ALL, NONE, DIRECT (Client side)
YES, NO (Server side)
ALL
Client usage With DoBroadcast=ALL (formerly DoBroadcast=YES)
a broadcast is performed to search for a server. The broadcast goes
first to the local subnet. If HOST= is
specified, broadcast packets are also sent to each of the hosts.
For TCP, all broadcast packets are UDP packets.
With DoBroadcast=DIRECT (formerly DoBroadcast=NO),
no broadcast is performed to the local subnet to search for a database
server. Broadcast packets are sent only to the hosts listed in the
HOST (IP) communication parameter. If you specify DoBroadcast=DIRECT,
the HOST (IP) communication parameter is required.
Specifying DoBroadcast=NONE causes
no UDP broadcasts to be used. A TCP/IP connection is made
directly with the HOST/PORT specified, and the server name
is verified. With TCP/IP, you can choose not to verify
the server name by setting the VerifyServerName (VERIFY) communication
parameter to NO. The HOST (IP) communication
parameter is a required parameter, while the ServerPort (PORT) communication
parameter is optional.
For DIRECT and NONE, you must specify the server host with the HOST option.
Server usage Setting DoBroadcast=NO prevents
the database server from broadcasting to find other servers with
the same name. This is useful in certain rare circumstances, but
it is not generally recommended.
The following command starts a client without broadcasting to search for a database server. Instead, the server is looked for only on the computer named silver.
dbisql -x tcpip(DOBROADCAST=DIRECT;HOST=silver) iqdemo
On UNIX, the options must be enclosed in quotation marks:
dbisql -x "tcpip(DOBROADCAST=DIRECT;HOST=silver)" iqdemo
