CONFIGFILE is the configuration file to use when starting the
daemon. The default configuration file is /etc/sqlrelay/sqlrelay.conf.
ID is just an identifier. Starting multiple connections with the
same ID make them available as a pool of connections. The more
connections you start, the more queries can be executed in
parallel. In addition, the ID argument specifies which config
file entry to use.
CONNECTIONID is another identifier. When using replicated or
clustered databases, within a pool of connections, some connections
will connected to 1 machine and some will connect to another. This
argument tells the connection daemon which machine to connect to. When
not using clustered or replicated databases, this id will be the same
for every connection in the pool.