This integer specifies the maximum size of communication packets. The default value is in bytes, but you can use k to specify units of kilobytes. The minimum value of CommBufferSize is 500 bytes, and the maximum is 16000 bytes.
If no CommBufferSize value is set, the CommBufferSize is controlled by the setting on the server, which defaults to 7300 bytes
on all operating systems except Windows Mobile. On Windows Mobile, the default is 1460 bytes.
The protocol stack sets the maximum size of a packet on a network. If you set the CommBufferSize to be larger than that permitted
by your network, the communication packets are broken up by the network software. The default size is a multiple of the standard
ethernet TCP/IP maximum packet size (1460 bytes).
A larger packet size may improve performance for multi-row fetches and fetches of larger rows, but it also increases memory
usage for both the client and the server.
If CommBufferSize is not specified on the client, the connection uses the server's buffer size. If CommBufferSize is specified
on the client, the connection uses the CommBufferSize value.
Using the -p database server option to set the CommBufferSize causes all clients that do not specify their own CommBufferSize
to use the size specified by the -p database server option.