PostgreSQL was not an object-oriented database, it was an object-relational database. Despite not living up to some people's exceptions that that it would repla

PostgreSQL was not an object-oriented database, it was an object-relational database. Despite not living up to some people's exceptions that that it would replace the relational database object-oriented databases were not a "huge failure". They are useful for applications where relational databases were not suitable, for example CAD (as mentioned in the article).