fcm_buffer_size – Inter-member buffer size configuration parameter

This parameter specifies the size of the FCM (Fast Communications Manager) buffer.

The FCM buffer is used to send work units between members within a Db2® instance.

This parameter, measured in bytes, determines the size of the FCM buffer. The default size is 32KB.

Configuration type
Database manager
Applies to
  • Database server with local and remote clients
  • Database server with local clients
  • Partitioned database server with local and remote clients
  • Db2 pureScale® members
Parameter type
Default [range]
32768 [4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576]

Updates to this parameter take effect only after you shut down and restart all members in an instance.