MAP segment type format
The IMS catalog MAP segment type contains information about a segment type mapping in an IMS database segment.
- Segment name
- MAP
- Parent name
- SEGM
- Sequence field
- MAPSEQ
- Segment length
- 520 bytes
| Offset (bytes) | Length (bytes) | Data type | Field name | Description | Unique key field | |
|---|---|---|---|---|---|---|
| 1 | 2 | X | LEN | Length of this segment | ||
| 3 | 2 | X | CTL | Control field | ||
| 5 | 2 | X | MAPSEQ | Sequence field, type = U | X | |
| 5 | 2 | X | SEQNUM | Sequence number | ||
| 7 | 2 | C | FILLER | Reserved | ||
| 9 | 128 | C | NAME | Name of this map | ||
| 137 | 128 | C | DEPENDON | The external name of the control field (found in the NAME field of the FLD catalog record) that determines which map case is used for each mapped segment instance in the user database. The control field is within this segment or in the segment that is specified on the CTLSEGNM parameter. | ||
| 265 | 8 | C | CTLSEGNM | The name of the segment whose key feedback data is used to determine the map case to use for a segment instance. | ||
| 273 | 248 | C | FILLER | Reserved | ||