Format of CDC records

The Change Data Capture (CDC) records contain a header that is common to all records, followed by a specific header for the type of CDC record.

The CDC_REC_INSERT, CDC_REC_DELETE, CDC_REC_UPDBEF, and CDC_REC_UPDAFT records also contain column data.

The header common to all CDC records describes the size and type of the CDC record.

Table 1. The header common to all CDC records
Section Size Description
Header size 4 bytes The number of bytes in the common and CDC record-specific headers.
Payload size 4 bytes The number of bytes of data in the record after the common and CDC record-specific headers.
Packet scheme 4 bytes The packetization scheme number of one of the packetization schemes contained in the syscdcpacketschemes table. The only packetization scheme is 66, CDC_PKTSCHEME_LRECBINARY.
Record number 4 bytes The record number of one of the CDC records contained in the syscdcrectypes table.