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PostgreSQL is an open-source relational database management system (RDBMS), which helps businesses store, manage, and scale data workloads, from single machines to data warehouses with multiple concurrent users. Features include materialized views, stored procedures, indexing, multi-factor authentication, full-text search, and event triggers. The ACID-compliant system lets developers define data types such as numeric, date/time, array, or geometry, build custom functions, and maintain data integrity using exclusion constraints, explicit locks, and primary or foreign keys. Database administrators can utilize SQL to perform multiple data operations such as INSERT, UPDATE, DELETE, and more. Using foreign data wrappers, IT professionals can access external databases or streams for querying. PostgreSQL maintains a write-ahead log (WAL), which helps developers record file changes and restore databases during system crashes. Administrators can grant role-based objects and column to table level permissions. Developers can also improve query performance on tables by using acceleration partition pruning, automatically invalidate cached execution plans, write background checkpoints, and restrict bandwidth usage for backup processes.

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