POSTGRESQL

PostgreSQL (pronounced "Post-GRES-Q-L" or just "Postgres") is an advanced, open-source relational database management system (RDBMS). It’s known for its reliability, robust feature set, and SQL compliance, making it a popular choice for developers and enterprises.

Key Features of PostgreSQL:

1. Open Source: Free to use, modify, and distribute.

2. ACID Compliant: Ensures data integrity through Atomicity, Consistency, Isolation, and Durability.

3. Support for Advanced Data Types:

JSON, XML

Arrays

HSTORE (key-value store)

Custom types

4. Extensibility: You can define your own data types, functions, and even write code in other languages (like Python via PL/Python).

5. MVCC (Multi-Version Concurrency Control): Allows high performance with many concurrent users.

6. Indexes and Full-Text Search: Includes support for B-trees, GIN, GiST, and more.

7. Stored Procedures & Triggers: For automation and business logic.

8. Replication & Fault Tolerance: Supports streaming replication, logical replication, and failover.

9. Foreign Data Wrappers (FDWs): Access data in other systems (like MySQL, MongoDB) from within PostgreSQL.