Self-defining sections
Use this topic as a reference for format of the self-defining sections of the SMF record.
A self-defining section of a type 115 SMF record tells you where to find a statistics record, how long it is, and how many times that type of record is repeated (with different values). The self-defining sections follow the header, at fixed offsets from the start of the SMF record. Each statistics record can be identified by an eye-catcher string.
The following types of self-defining section are available to users for type 115 records. Each
self-defining section points to statistics data related to one of the IBM® MQ components. Table 1 summarizes
the sources of the statistics, the eye-catcher strings, and the offsets of the self-defining
sections from the start of the SMF record header.
| Source of statistics | Record subtype (SM115STF) | Offset of self-defining section | Eye-catcher of data | |
|---|---|---|---|---|
| Dec | Hex | |||
| Storage manager | 1 | 100 | X'64' | QSST |
| Log manager | 1 | 116 | X'74' | QJST |
| Message manager | 2 | 36 | X'24' | QMST |
| Data manager | 2 | 44 | X'2C' | QIST |
| No longer used. The self-defining section will be binary zeros. | 2 | 52 | X'34' | |
| Lock manager | 2 | 60 | X'3C' | QLST |
| Db2® manager | 2 | 68 | X'44' | Q5ST |
| Coupling Facility manager | 2 | 76 | X'4C' | QEST |
| Topic manager | 2 | 84 | X'54' | QTST |
| SMDS usage | 2 | 92 | X'5C' | QESD |
| Buffer manager - one for each buffer pool | 215 | 36 | X'24' | QPST |
| Channel initiator | 231 | QWSX | ||
| Storage manager | 5 | 36 | X'24' | QSPH |
| Storage manager | 6 | 36 | X'24' | QSGM |
| Storage manager | 7 | 36 | X'24' | QSRS |
Note: Some of the storage manager information in subtype 5, 6 and 7 records is intended only for
IBM use. Other self-defining sections that are not
listed contain data for IBM use only.
Each self-defining section is two fullwords long and has this
format:
ssssssssllllnnnn
- ssssssss is a fullword containing the offset from the start of the SMF record.
- llll is a halfword giving the length of this data record.
- nnnn is a halfword giving the number of data records in this SMF record.
For more information see, Examples of SMF statistics records.
Note: Always use offsets in the self-defining sections to locate the statistics records.