CONNECTION_EXTERNAL_WRITE_BUFFER (Parameter)

Parameter: CONNECTION_EXTERNAL_WRITE_BUFFER

Definition

Do not use this parameter, except under SAP Support Team supervision or under specific recommendation provided within the SAP CC documentation

Description and Use

Caution

Do not change the value of this SAP CC system parameter in a productive landscape, except under the direct supervision of a support specialist from your SAP Support Team, an expert from your operations team, or under specific recommendation provided within the SAP CC product documentation.

This system parameter defines the number of write buffers used by a dispatcher instance to reply to a connected client application or system for external communications via the Message TCP technical interface. This parameter is used to control the data flow between dispatcher instances and external systems. For example, you can increase this parameter if a dispatcher instance handles a large quantity of responses to send to a client application or system.

System Configuration (Advanced): Tuning

Fine-Tuning the Parameter Value

The number of write buffers is by default set to 3. You can however change this value from 3 to 1,000 depending on the data flow between instances. The metric 'ConnectionStatistics' can help you to determine the number of write buffers by giving how much time has elapsed before an instance can write a message in an empty buffer. If this time increases, you must increase the number of write buffers in the dispatcher instances.

Syntax and Constraints

Defined Constraints

The SAP CC Core Server system verifies the following constraints:

Instance Type	Constraint
Dispatcher instances	The parameter must be less than or equal to 1000 . The parameter must be greater than or equal to 3 .

Technical Details

For more information, consult this section.

Name

CONNECTION_EXTERNAL_WRITE_BUFFER

Do not use this parameter, except under SAP Support Team supervision or under specific recommendation provided within the SAP CC documentation

Category Parameter

Type Integer

Access (RO/RW)

RW(+): Dynamic Read / Static and Dynamic Write

An immediate change is possible but is temporary. When it is relevant, change the permanent settings used by the SAP CC Core Server system when it restarts.

Use the Admin+ user interface to change the runtime values or the permanent values of this system parameter in an instance of the SAP CC Core Server system or in multiple instances.

Groups

Instance Type

This system parameter is only available in the following type of instances in a running SAP CC Core Server system:

dispatcher

Default Value (Factory Settings)

The predefined default value is:

Instance Type	Value
Dispatcher	`3`

You can use a default value to reset the runtime value or the restart value (persistent) in the Admin+ user interface.

Note

A default value is part of the factory settings of the SAP CC Core Server systems. It differs from the original value set during the installation or after the Customizing activities.

In Admin+, you can reset a parameter value to this default value, but it is not recommended:

This value may differ from the original value set during the installation of your SAP CC system.
Note that it may also differ from the value defined by the implementation project team and set during the Implementation Phase of the integration project.

Verify the values in your running SAP CC systems before to use the reset command.

Constraints

The SAP CC system checks the following constraints:

Dispatcher instances

The parameter must be less than or equal to 1000 .
The parameter must be greater than or equal to 3 .