Dequeue map MTA option

File reading during dequeue
The  option controls whether files are mapping into memory when  dequeuing. The default is 1 (true), meaning that files are so mapped. Disabling this, by setting this option to 0 (false), can be expected to have a detrimental effect on performance (and will likely cause the   channel to abort and core).

Caution: Use of this option is RESTRICTED.

See also:
 * File format MTA options
 * MTA performance tuning
 * ims-ms channels