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
Table 1. MAP segment type format
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  
Start of change137End of change Start of change128End of change Start of changeCEnd of change Start of changeDEPENDONEnd of change Start of changeStart of changeThe 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.End of changeEnd of change Start of change End of change
Start of change265End of change Start of change8End of change Start of changeCEnd of change Start of changeCTLSEGNMEnd of change Start of changeThe name of the segment whose key feedback data is used to determine the map case to use for a segment instance.End of change Start of change End of change
Start of change273End of change Start of change248End of change Start of changeCEnd of change Start of changeFILLEREnd of change Start of changeReservedEnd of change Start of change End of change