PostgreSQL is free open Source relational database management with the ability to handle Data Warehouses or Online Applications such as web and mobile applications.
PostgreSQL supports ACID ( Atomicity, Consistency, Isolation, Durability) with very rich functionality as any Enterprise Database. It has features like Materialized view, Analytic functions, Parallel queries, etc.
PostgreSQL can scale reads and achieve high availability using replication.
Repmgr or pgpool2 can be used to manage replication, failover, and load balancing.
Use Case:
Online applications such as Web, Mobile, or desktop Applications.
Small data warehouses.
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