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Procedure documentation Monitoring the Informix Network Interface  Locate the document in its SAP Library structure

Use

You can use the SAP/Informix database monitor to monitor the Informix network interface. For up-to-date recommendations, see SAP Note 41360.

Prerequisites

The default configuration of the Informix network interface is adequate for small and medium-sized installations. However, if you have more than about 50 SAP work processes, consider tuning the Informix network interface.

Procedure

Tune the Informix network interface using the NETTYPE parameter, which has the form ("VP" means "virtual processor"):

NETTYPE <Protocol>, <number of poll threads>, <number of users>, <VP class>

Sub-parameters for the NETTYPE Parameter

Sub-parameter

Meaning

Protocol

You can use either ipcshm (shared memory for SAP Systems on the database server) or soctcp (tcp connection for remote application servers).

Number of poll threads

The general rule is one poll thread for 30 to 50 work processes. Each poll thread needs its own VP (so if you only have one CPU virtual processor, you cannot put three poll threads in class CPU).

Number of users

Specify the total number of expected work processes (not higher than the USERTHREADS parameter in the Informix ONCONFIG file).

VP class

You can specify either CPU or NET . CPU results in the best performance. If, however, you only have one CPU VP, and you want both shared memory and network connections, you need to use a NET VP for one of the threads (or use TCP for the central system).

 

See also:

NETTYPE (Informix)