SGlossary
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subschema
Section of a schema required for a particular application; it can be restructured,
within limits, for the intended application; a subschema is defined by means of
the Subschema DDL.
Subschema DDL
Formalized language for defining a subschema.
Subschema Information Area (SSIA)
The SSIA contains all subschema information required by the DBH to carr y out,
on behalf of the user, the database accesses permitted within the specified
subschema. The DBH loads the SSIA into main memory when it is referenced in
a READY command.
subschema module
Module resulting from subschema compilation when a COBOL DML program is
compiled. It must be linked in to the application program and includes the USER
WORK AREA (UWA) as well as the RECORD AREA, which is also part of the
base interface block (BIB). The name of the subschema module is the first 8 bytes
of the subschema name.
subschema record
Record defined in the Subschema DDL.
SUB-SCHEMA SECTION
In COBOL programs with DML statements: section of the DATA DIVISION used
for specifying the schema name and the subschema name.
subtransaction
In a distributed transaction, all the processing chains that address the databases
in one configuration form a subtransaction.
system area
Realm required only by UDS/SQL. The system areas of a data base include:
–the Database Directory (DBDIR),
–the Database Compiler Realm (DBCOM),
–the COBOL Subschema Directory (COSSD)
system break information
Indicates whether the database is consistent or inconsistent.