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• Database Schema: The description
of a database.
Includes descriptions of the
database structure, data types, and the constraints on the database.
• Schema Diagram: An illustrative
display of (most aspects of) a database schema.
• Schema Construct:
A component of the schema
or an object within the schema, e.g., STUDENT,
COURSE.
• Database State: The actual data
stored in a database at a particular moment in time. This includes the
collection of all the data in the database. Also called database instance (or
occurrence or snapshot).
• The term instance is also
applied to individual database components, e.g. record instance, table
instance, entity instance
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