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66 DB2 Manager User Guide
StorageTek Proprietary
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 Length Format Description
0 1 Char DB2 Manager task issuing request:
’T’ – tape reader task
’D’ – disk reader task
’W’ – tape writer task