StorageTek 312564001 manual Record descriptor section, Database section, Offset, Length, Format

Record descriptor section

The SMF header section is immediately followed by the DB2 Manager record descriptor section. It has a fixed length of 38 bytes.

Offset	Length	Format	Description
18	6	bin	Reserved.
24	4	bin	Offset of database section. This is the
			offset from the start of the SMF record
			of the database section of the record.
28	2	bin	Length of database section. This is the
			length in bytes of a single database
			section.
30	2	bin	The number of database sections
			present in the record (always = 1).
32	4	bin	Offset of request section. This is the
			offset from the start of the SMF record
			of the first request section in the record.
36	2	bin	Length of request section. This is the
			length in bytes of a single section. This
			will always be 96 bytes.
38	2	bin	The number of request sections
			present in the record.
40	16	-	Reserved for future use.

Database section

The storage group section starts at the offset specified in the record descriptor section of the DB2 Manager SMF record. It gives information about the database being processed for object storage or retrieval. It has a fixed length of 24 bytes. Only one database group section will be present per SMF record.

Offset

0

Length

1

Format	Description
Char	DB2 Manager task issuing request:
	’T’ – tape reader task
	’D’ – disk reader task
	’W’ – tape writer task

66	DB2 Manager User Guide
	StorageTek Proprietary