That question is asking me many times. Which database is better, what is performance difference, should i go with open source database.

Oracle Database and PostgreSQL are both powerful relational database management systems (RDBMS), but they have differences in terms of features, licensing, performance, community, and more.

Here’s a comparison between Oracle and PostgreSQL based on common factors:

Licensing:

Oracle: Oracle Database is a commercial product and comes with various licensing options that can be expensive, especially for large enterprises.
PostgreSQL: PostgreSQL is open-source and released under the PostgreSQL License, which is more permissive. It allows you to use, modify, and distribute the software freely.

Ps: Do not forget many enterprise company go with EDB PostgreSQL and some other options which are already license base database.

Cost:

Oracle: Licensing, support, and maintenance costs for Oracle Database can be substantial.
PostgreSQL: While PostgreSQL itself is free, you might incur costs for support, consulting, and third-party tools.

Features:

Oracle: Oracle Database offers a comprehensive set of advanced features like advanced analytics, partitioning, real application clusters, data guard for high availability, and more.
PostgreSQL: PostgreSQL has a wide range of features and supports advanced SQL, extensibility through custom functions and extensions, and offers features like table partitioning and logical replication.

Performance:

Both databases are highly performant, but the performance can vary based on workload, tuning, and hardware. Oracle often emphasizes its performance optimization and scalability features.
Scalability:

Oracle: Offers high scalability through features like Real Application Clusters (RAC) and Sharding.
PostgreSQL: Offers scalability through options like table partitioning and connection pooling.
Community and Support:

Oracle: Has a large community and offers commercial support, but support costs can be high.
PostgreSQL: Has a strong open-source community and also offers commercial support through third-party companies.
Ease of Use and Configuration:

Both databases provide tools for administration and management, but the ease of use can depend on familiarity and personal preference.
Extensibility:

PostgreSQL: Known for its extensibility, allowing users to create custom functions, operators, and even entirely new data types.
Replication and High Availability:

Oracle: Provides features like Data Guard for replication and high availability.
PostgreSQL: Offers streaming replication and logical replication options for high availability.
Compatibility:

Oracle: Has strict compatibility and follows its own SQL dialect.
PostgreSQL: Adheres more closely to the SQL standards, which can make it easier to migrate between different databases.
The choice between Oracle and PostgreSQL often depends on factors such as budget, existing expertise, specific feature requirements, scalability needs, and more.

Larger enterprises with complex needs might lean towards Oracle for its enterprise-grade features, while smaller businesses and projects might find PostgreSQL’s open-source nature and lower costs more appealing.