Parameter
rdisp/max_arq

Short text
Max. number of internal asynchronous messages

Parameter description
An SAP work process (WP) can contain diverse messages:

• Requests from a SAP GUI


• Requests from an ABAP program (RFC requests)


• Requests from other WPs/application servers (messages)


• Results of outstanding calls (enqueues, RFCs)

The procedure is always such that a message leads to the work processbeing activated. The work process performs an action, possibly sends aresult back and then waits for a new message.
There are also cases where while one message is being processed, othermessages are sent and it may be necessary to wait for their responses.Examples of this are enqueue and establishing RFC connections.Particularly with an asynchronous RFC, the RFC replies can be sent atany time you want.
However, since the work process cannot process every type of message inevery situation, each SAP context has a local queue. Here messages thatcannot be immediately processed are stored temporarily. The parameterrdisp/max_arq defines the size of this local queue.

Work area
Dispatcher

Parameter unit
Integer

Default value
500

Who is allowed
SAP only

Limitation for os
None

Limitation for db
None
If a lot of RFC balancing accumulates on one application server and thevalue of parameter rdisp/max_comm_entries
has been increased to accommodate this, we recommend that you setrdisp/max_arq to the same value.