The SDA extension commands for Extended File Cache (XFC) enable
    you to display the following information in a convenient and
    readable format:

    o  Various XFC data structures

    o  Statistics that aid in tuning the extended file cache

    You can also control the types of events that are recorded by
    XFC's tracing feature.

    You can enter XFC commands at the SDA prompt or you can access
    online help, as follows:

    SDA> XFC HELP