Technical data
member condition
The condition, for which a truth value can be determined, that a database record
is a member of one or more sets.
member record
A database record, other than the owner record, included in the set. There may
be one or more member record types in a set. There may be zero or more member
records in a set.
nonsingular set
A database set not owned by the SYSTEM. See also SYSTEM-owned set and
owner record.
null
A data attribute associated with currency indicators and database key values.
This attribute is independent of the value of the contents of data items.
OPTIONAL member
A database record that does not necessarily remain a permanent member of a
set. Its membership in a set may be changed using the DISCONNECT statement
without its being deleted from the database. OPTIONAL set membership is
declared in the schema.
Oracle CDD/Repository
The central repository of information about data elements, data structures,
and relationships between data structures. Oracle CDD/Repository is used by
Oracle CODASYL DBMS, Datatrieve, and HP COBOL. It does not contain actual
data files. Rather, it contains definitions of schemas, storage schemas, and
subschemas. Oracle CDD/Repository is available under a separate license.
owner record
The head of a group of database records that make up a set. There can be only
one record type as the owner for each set type and one owner record occurrence
for each set occurrence.
PROTECTED usage mode
The state of a realm in which it may be retrieved from but cannot be modified by
concurrent run units.
quiet point
A time when no run units are accessing a database. Quiet points and
transactions are mutually exclusive (for the entire database). Compare with
transaction.
For the run unit, the time between a COMMIT or ROLLBACK, and the following
READY.
ready mode
The state of a realm after execution of a READY statement for that realm and
before the execution of a COMMIT or ROLLBACK statement for that realm.
realm
One or more schema areas. Realms are declared in the subschema. See also area.
Glossary–6