What limitations exist in the PostgreSQL database management system?

PostgreSQL is a powerful and feature-rich DBMS, but it has some limitations:

• Size limitations: the maximum database size can reach several terabytes, but depends on the filesystem and configuration.
• Connection limitations: by default limited (usually 100), which may require tuning for high loads.
• Lack of built-in support for horizontal scaling: external solutions (sharding) are often used for scaling.
• Data type limitations: although many types are supported, specific or very new types may be absent.
• Performance under very high loads: fine-tuning and optimization may be necessary.

It is important to consider these aspects when designing architecture and choose PostgreSQL if its capabilities meet the project requirements.