Structure of records and tables Record structure
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Anchor record
In addition to the records defined in the schema DDL, UDS/SQL autom atically generates
one anchor record for each SYSTEM set. In SYSTEM sets, the anchor record assume s the
function that the DBTT of an owner record type performs in a normal set. The anchor record
contains its own act-key as well as the act-keys of the tables belonging to the SYSTE M set.
It is extended by SCD if the records of the SYSTEM set are stored as a chain.