Release 10.1A: OpenEdge Data Management:
Database Administration

Shared memory

The OpenEdge RDBMS uses shared memory to hold database buffers, latches, and control information including the lock table, AI buffers, and BI buffers. The amount of shared memory allocated for database buffers is specified by the -B startup parameter. The maximum value for -B is 125,000,000, but in practice, you will never set -B that high.

The maximum amount of shared memory that can be allocated is operating system dependent, and will never exceed the following maximums:

Approximately 2Gb, for 32-bit systems.
Approximately 116Gb, for 64-bit systems.