From the command line, Geronimo does not have very good support for altering a database pool configuration at runtime. The best way to reconfigure a database pool on the command line is to alter the original configuration file, and then redeploy the database pool (or the application or client module containing the pool definition).

However, pools can be conveniently reconfigured from the console, as described in Section 6.3.5, “Edit an Existing Pool”.