How does the relational database model work?

How does a database model work?

Contents. A database model shows the logical structure of a database, including the relationships and constraints that determine how data can be stored and accessed. Individual database models are designed based on the rules and concepts of whichever broader data model the designers adopt.

How does a relational database work internally?

When it needs to read data (tables or indexes), a relational database will map the disk-based pages into memory buffers. When it needs to modify data, the relational database changes the in-memory pages. To synchronize the in-memory pages with the disk, a flush must occur (e.g. fsync).

How is relational database implemented?

In a relational database, all data are stored and accessed via relations. Relations that store data are called "base relations", and in implementations are called "tables". Other relations do not store data, but are computed by applying relational operations to other relations.

What does a relational model do?

The purpose of the relational model is to provide a declarative method for specifying data and queries: users directly state what information the database contains and what information they want from it, and let the database management system software take care of describing data structures for storing the data and ...