Release 10.1A: OpenEdge Deployment:
Startup Command and Parameter Reference

Message Buffer Size (-Mm)

Use Message Buffer Size (-Mm) to specify the standard message buffer size, in bytes. This parameter is relevant only for network client/server connections.

Operating system and syntax	UNIX Windows	-Mm n
Use with	Maximum value	Minimum value	Single-user default	Multi-user default
Client Connection, Database Server	32,600	350	–	1,024

n

The message buffer size.

OpenEdge uses message buffers to move records (messages) between servers and remote clients. Records (plus 40-byte headers) larger than the message buffer size are fragmented into multiple messages. If your database records are large, increase this parameter to avoid record fragmentation. However, if the network works more efficiently with small messages, reduce -Mm and fragment larger records.

Note: On a given database, you must specify the same message buffers size when starting the server or broker (using PROSERVE) and multi-user clients (using MPRO) and when shutting down the database (using PROSHUT). That is, if you change the -Mm value on any database command, you must change all PROSERVE command, MPRO command, and PROSHUT commands accordingly. For more information, see OpenEdge Data Management: Database Administration .