Final answer:
Metadata refers to data about other data and includes table structures, constraints, and security information in the context of databases. Tuples and stored procedures are not considered metadata.
Step-by-step explanation:
Metadata refers to data that describes other data. When working with databases, metadata is crucial as it provides information about the database's structure and objects within it. Typical examples of metadata include a-Table structures, b-Constraints, and d-Security information.
- Table structures represent the schema of tables, such as columns, data types, and relationships between tables.
- Constraints are rules enforced on data in the database, such as primary keys, foreign keys, and check constraints.
- Security information includes roles, permissions, and security policies applied to objects and users in the database.
Tuples in tables (c) are the actual data or records stored within the tables and are not considered metadata. Stored procedures (e) are sets of SQL statements that perform a specific task, which, while important, are not typically categorized as metadata either.