Latch trace
When you use the /TRACE SET ON TABLE LATC command, IMS traces events related to its internal serialization services (latch manager, use manager, and system locate control function) to an internal table.
The following table shows the general format of a latch trace entry.
| WORD 0 | WORD 1 | WORD 2 | WORD 3 | WORD 4 | WORD 5 | WORD 6 | WORD 7 | ||
|---|---|---|---|---|---|---|---|---|---|
| I | S | SEQ NUM | ENTRY TYPE | ||||||
where:
- I
- One-byte trace ID field. This byte indicates the type of the trace entry. It is always X'70' for latch trace entries.
- S
- One-byte trace subtype field. This field is used for latch manager trace entries to denote the latch function being traced. It is not currently used for Use Manager trace entries.
- SEQ NUM
- Two-byte trace sequence number assigned by the IMS trace component.
- ENTRY TYPE
- For Use Manager trace entries only: 4-byte printable character string, indicating the type of entry.
Words 2 through 6 contain data specific to each trace entry.