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S Glossary
292 U929-J-Z125-9-76
rollback
Canceling of all updates effected within a transaction.
RSQ
See record sequence number.
RUNUNIT-ID
See transaction identification.
S
schema
Formalized description of all data structures permitted in the database. A
UDS/SQL schema is defined by means of the Schema DDL.
Schema DDL
Formalized language for defining a schema.
Schema Information Area (SIA)
The SIA contains the complete database definition. The DBH loads the SIA into
main memory at the start of DB processing.
SEARCH KEY
Secondary key; access paths using secondary keys are created by UDS/SQL by
means of hash routines and multi-level tables.
SEARCH KEY table
Multi-level table used by UDS/SQL as an access path via a secondary key.
secondary key
Any key which is not a primary key. Used for direct access to a record or a set of
records with the same key values or within a search interval.
secondary subtransactions
Subtransactions that address remote configurations.
sequence number
Identifier in the name of the ALOG files (000000001 - 999999999). The first
ALOG file of a database is always numbered 000000001.