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 .

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