Technical data

realm currency indicator
A currency indicator (in other words, database key value) associated with a
particular realm. A realm currency indicator identifies a particular database
record, position in the realm, or both.
record key
A key whose contents identify a record in an indexed file or within a record type
in a database. Within an indexed file, record key is either the prime record key
or an alternate record key. Within a database, a record key may or may not have
ordering significance.
record occurrence
A user-stored instance of a record type. A record occurrence is the actual physical
data representation of a single record in the database, but not its definition,
which is the record type.
record order key
A record key associated with a record type in a database. The definition of a
record order key in the schema causes the DBCS to maintain the records in the
specified logical sequence based on values of the record order key.
record selection expression
A word or group of contiguous words in a COBOL source program that specifies
the algorithm to be used by the Database Control System (DBCS) to identify a
specific database record.
record type currency indicator
A currency indicator associated with a particular database record type. A record
type currency indicator identifies a particular record of the record type. If the
subschema includes a record order key for a record type, its associated currency
indicator identifies a particular record, position in the record type, or both.
RETRIEVAL usage mode
The state of a realm in which the current run-unit may only retrieve from it.
schema
The logical description of a database, including data definitions and data
relationships. The schema is written using the schema data definition language
(schema DDL).
schema DDL
The language used to define the logical structure of a database.
schema-name
A user-defined word that identifies a schema.
section header
A combination of words (followed by a separator period) that indicates the
beginning of a section in the Environment, Data, and Procedure Divisions of
a COBOL program. In the Environment and Data Divisions, a section header
consists of reserved words followed by a separator period in the Division.
SUB-SCHEMA SECTION is a valid section header.
Glossary–7