Data change header description record (XHDF)
The logical log contains one instance of the Data Change Header Record for every header field in the data change record of the logical log data set. It describes the format of each header field in the change record to allow a program to process the change records.
For more information, see Logical log data file.
Record status: Platform independent
Field name | Offset | Definition | Description | |
|---|---|---|---|---|
Dec | Hex | |||
CNTLRECORDTYPE | 00 | 00 | CHAR(4) | Control record type: XHDF - Data Change Header Description Record |
HEADFIELDNAME | 04 | 04 | CHAR(18) | Name of this header field |
HEADFIELDTYPE | 22 | 16 | CHAR(4) | Type of data in this field: BIN - binary / hexadecimal CHAR - character INT - integer (length is 2 or 4) DTTM - timestamp value (length is 26) |
HEADFIELDSUBTYPE | 26 | 1A | CHAR(1) | Format of data within type: U - unsigned format (BIN subtype) No subtype exists for CHAR, INT, or DTTM |
HEADFIELDLEN | 27 | 1B | CHAR(5) | Length of this header field |
HEADFIELDPOS | 32 | 20 | CHAR(5) | Offset of this field in the logical log data change record |
(Total Length) | 37 | 25 | Not applicable | Not applicable |
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