postgres architecture - ghdrako/doc_snipets GitHub Wiki
Cluster > Catalog > Schema > Table > Columns & Rows
So in both Postgres and the SQL Standard we have this containment hierarchy:
- A computer may have one cluster or multiple.
- A database server is a cluster.
- A cluster has catalogs. ( Catalog = Database )
- Catalogs have schemas. (Schema = namespace of tables, and security boundary)
- Schemas have tables.
- Tables have rows.
- Rows have values, defined by columns. Those values are the business data your apps and users care about such as person's name, invoice due date, product price, gamer’s high score. The column defines the data type of the values (text, date, number, and so on).
Diagram showing nesting boxes representing how connecting on a port gets you to cluster (a database server) which contains one or more Catalogs (a database) each of which contains one or more Schemas (a namespace) each of which contains tables each of which has rows.