PostgreSQL
PostgreSQL is a full-featured open-source (O)RDBMS.
- provides a relational engine with:
- efficient implementation of relational operations
- very good transaction processing (concurrent access)
- good backup/recovery (from application/system failure)
- novel query optimisation (genetic algorithm-based)
- replication, JSON, extensible indexing, etc. etc.
- already supports several non-standard data types
- allows users to define their own data types
- supports most of the SQL3 standard
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