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). |
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DB2 Manager User Guide | 65 |
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