PostgreSQL is a cross-platform, open-source RDBMS that strictly adheres to ACID principles. It supports complex analytical queries, foreign keys, triggers, and stored procedures in multiple programming languages. The architecture relies on a process-per-connection model, ensuring transaction isolation and system stability in the event of individual session failures.
The system utilizes Multi-Version Concurrency Control (MVCC) to manage concurrent access. This allows reading data without locking write transactions and vice versa. PostgreSQL supports advanced indexing methods such as B-tree, Hash, GiST, SP-GiST, GIN, and BRIN, which are essential for geospatial data (via PostGIS) and full-text search operations.
How it works
PostgreSQL efficiently handles hybrid data schemas. For instance, to store semi-structured logs, the JSONB type is used: CREATE TABLE events (id serial PRIMARY KEY, payload jsonb);. Adding a GIN index via CREATE INDEX idx_gin ON events USING gin (payload); enables sub-millisecond searches within nested fields even in tables containing hundreds of millions of records.
- Replication support: logical and physical (streaming).
- Maximum table size: 32 TB.
- Compliance: implements most features of the SQL:2023 standard.