StorageTek 312564001 manual SMF header section, Offset, Length, Format, Description

4.Termination of request processing by the reader or writer task in the control region.

Analysis of timestamp intervals will provide timings for the following activities:

•4 - 1 : total time for DB2 Manager to process the request.

•2 - 1: time spent in control region scheduler queue.

•3 - 2: time spent in reader or writer task queue.

•4 - 3: time taken to retrieve object from tape or disk and locate migrated row (reader tasks) or to add migrated row to Archive Manager object (writer tasks).

Careful analysis of this information will assist in identifying possible performance problems during object retrieval processing.

The following sections describe the individual components that constitute the DB2 Manager SMF record.

SMF header section

Each SMF record will have a standard SMF header section of length 18 bytes.

Offset	Length	Format	Description
0	2	bin	Record length. This is the length of
			the entire SMF record, including this
			field.
2	2	bin	Segment descriptor - binary zeroes.
4	1	bin	System indicator - binary zeroes.
5	1	bin	Record type (equal to the value of the
			SMF record identifier specified
			defined for the database being
			processed).
6	4	bin	Time since midnight, in hundredths of
			a second, that the SMF record was
			written.
10	4	packed	Date record was written, in the format
			0cyydddF, where F is the sign.
14	4	char	System identification (from CVT).

DB2 Manager User Guide	65
StorageTek Proprietary