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What this quiz covers
- Controlled sharing + least privilege + documenting who/what/why (external schema).
- SQL access control: users, roles, privileges, GRANT/REVOKE, schema USAGE, search_path.
- Views for controlled access (including hiding columns + showing processed/aggregated data).
- Concurrency: lost update, transactions, locking, deadlock; pessimistic vs optimistic.
- Data quality: accurate/complete/timely/relevant/understandable/trustworthy.
- Continuity: full/differential/incremental backups, transaction logs, recovery idea; fault tolerance.
- Alternatives: ACID, CAP, BASE, NoSQL, OLAP/data warehouse, document/semantic processing.
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