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PostgreSQL is a powerful, open-source relational database management system (RDBMS) known for its robustness, extensibility, and standards compliance. Developed by a vibrant community of contributors, PostgreSQL offers advanced features that cater to the needs of both small-scale applications and large enterprises. One of PostgreSQL's standout features is its support for complex data types, including arrays, hstore (key-value pairs), and JSONB (binary JSON). This versatility makes it suitable for handling diverse data types and accommodating evolving data models. With a strong emphasis on standards compliance, PostgreSQL adheres to SQL and ACID (Atomicity, Consistency, Isolation, Durability) properties, ensuring reliability and data integrity. Its extensibility is showcased through the availability of numerous extensions, allowing users to tailor the database to specific requirements. PostgreSQL's support for indexing, advanced query optimization, and concurrency control mechanisms contributes to its exceptional performance. Furthermore, its transactional capabilities facilitate concurrent access to the database while maintaining data consistency.
Amardeep et al. (Mon,) studied this question.