Shared SMF File definitions provide automatic SMF file selection
when you generate Report Set or HDB load JCL. There are two types
of SMF File definitions, Daily and Cyclic:
- Daily files
- Daily SMF files span a period of time for the current day (today).
They are used when you request reporting for today.
Daily SMF files
are typically GDGs, one generation created by each SMF dump (IFASMFDP)
job. They can only be defined by the Take-up from SMF File facility.
A daily SMF file remains available for reporting until
you uncatalog or delete its data set. When a daily SMF data set is
uncataloged or deleted, CICS PA marks
its SMF file definition as "expired" (no longer available for
reporting). To delete expired daily SMF file definitions, run the
HDB housekeeping utility.
- Cyclic files
- There are two types of cyclic SMF file:
- Cyclic files with an origin
- These files cover a known period of time, according to the origin,
interval, and DISP values that you specify. CICS PA uses
these values to determine which data sets to select for a requested
reporting period. These cyclic SMF files are typically GDGs. For example,
a weekly SMF GDG where the most recent cycle (generation 0) spans
the current week, -1 is last week, and so on. CICS PA supports
various intervals, including daily, weekly, monthly, yearly and fixed
(number of days) cycles.
- Cyclic files with no origin
- Cyclic SMF files with an origin value of NONE (no origin) cover
an undetermined period of time. Specify an origin of NONE when you
want to explicitly select a particular SMF data set for reporting,
regardless of the reporting period.
You cannot report on a mix of cyclic SMF files
with and without origins. If a system contains definitions for cyclic
SMF files with and without origins, then you must either exclude the
files with no origin, or exclude all of the others.
You specify
one or more cyclic SMF file definitions that match the way you collect
and manage long-term SMF data at your installation.