Views, Sequences, Synonyms, Materialized Views, and Object Basics
Learn Oracle objects that simplify access patterns, key generation, naming, and reporting performance.
Inside this chapter
- Why Additional Objects Matter
- Views and Materialized Views
- Sequences and Identity Strategies
- Synonyms and Naming Flexibility
Series navigation
Study the chapters in order for the clearest path from Oracle SQL basics to PL/SQL, recovery, tuning, and enterprise operations. Use the navigation at the bottom of each page to move through the full series.
Why Additional Objects Matter
Oracle DB includes many object types beyond tables. These objects help centralize logic, simplify access, improve performance for repeated queries, and support larger application architectures.
Views and Materialized Views
CREATE VIEW active_customers AS
SELECT customer_id, full_name, email
FROM customers
WHERE is_active = 1;A view offers a reusable query interface. A materialized view stores the result for faster repeated reporting, though it requires refresh management.
Sequences and Identity Strategies
CREATE SEQUENCE customer_seq
START WITH 1
INCREMENT BY 1;Sequences have long been a common Oracle way to generate unique numbers. Even when identity columns are available, students should understand sequences because many existing enterprise systems still use them heavily.
Synonyms and Naming Flexibility
Synonyms provide alternate names for database objects and can simplify access in some enterprise environments. Advanced users should understand them because they appear frequently in large Oracle systems with multiple schemas and application layers.