LGDFINT

The LGDFINT system initialization parameter specifies the log defer interval to be used by CICS log manager when determining how long to delay a forced journal write request before invoking the MVS system logger.

LGDFINT={5|number}
The value is specified in milliseconds.
5
This is the default. When this parameter was first introduced, the default value was 30 milliseconds, but customer experience has shown that 5 is a more realistic value.
number
number can be any value in the range 0 through 65535. You are recommended to allow LGDFINT to assume its default value, 5.
You can modify the log defer interval dynamically using the LOGDEFER option of the CEMT SET SYSTEM or EXEC CICS SET SYSTEM command. However, you are recommended not to modify this value in a production environment without first performing a system evaluation and performance analysis of any changed value.

If you change the log defer interval value dynamically, the new value is not cataloged. The log defer interval value is taken from the LGDFINT system initialization parameter in all types of CICS startup.

When a CICS system has many tasks issuing forced log write requests, these tasks will not be delayed for periods close to the LGDFINT parameter value. This is because a forced log write request is normally issued while a log deferral is already being performed for another task. The actual interval might also be affected by the need for tasks to wait across a partition exit.

Parent topic: The system initialization parameter descriptions and summary

dfha2_lgdfint.html | Timestamp icon Last updated: Thursday, 27 June 2019