Pervasive PSQL is an ACID-compliant DBMS
It is optimized for embedding in applications and used in several different types of packaged software applications offered by independent software vendors (ISVs) and original equipment manufacturers (OEMs). It is also optimized for software as a service (SaaS) deployment due to a file-based architecture enabling partitioning of data for multitenancy needs.
Applications can store the data and the relationships in tables in a relational model (RDBMS) or store the data in a schema-less way with no fixed data model (key-value store).