Technical data

storage schema DDL
The language used to define the physical organization of the database.
SUB-SCHEMA SECTION
The section of the Data Division that defines the subschema and keeplists to be
used by the COBOL program.
subschema
A user view of a database. The subschema can include everything in the original
schema DDL or any part thereof. The subschema is written using the subschema
data definition language (subschema DDL).
subschema DDL
The language used to define the user view of a database.
subschema entry
An entry in the Subschema Section of the Data Division that specifies the
subschema to be accessed by the COBOL program.
subschema-name
A user-defined word or nonnumeric literal that identifies a subschema.
SYSTEM-owned set
A set owned by the SYSTEM rather than by a record type. SYSTEM-owned sets
have only one occurrence in the database and are used for relationships with
large numbers of member occurrences or as entry points into the database.
tenancy condition
The condition, for which a truth value can be determined, that a record is a
member, owner, or either, of one or more sets.
tenant
A database record that is either the owner or a member of a specific set.
tenant record
An owner or member record of a set.
UPDATE usage mode
The state of a realm in which the current run-unit may update it, as well as
retrieve from it.
usage mode
The combination of the DML READY statement’s allow mode and the access
mode. The usage mode describes how a READY realm can be accessed. The eight
usage mode combinations are:
CONCURRENT RETRIEVAL
CONCURRENT UPDATE
EXCLUSIVE RETRIEVAL
EXCLUSIVE UPDATE
Glossary–9