Distributed Databases Questions
There are three main types of distributed database architectures:
1. Homogeneous Distributed Database Architecture: In this architecture, all the sites in the distributed database have the same DBMS software and hardware. The data is distributed across multiple sites, but the database schema and data models remain consistent across all sites.
2. Heterogeneous Distributed Database Architecture: In this architecture, different sites in the distributed database may have different DBMS software and hardware. The data is distributed across multiple sites, and each site may have its own database schema and data models. To enable communication and data exchange between different sites, a middleware layer is used.
3. Federated Distributed Database Architecture: In this architecture, each site in the distributed database maintains its own local database, and there is no centralized control. However, there is a global schema that defines the overall structure of the distributed database. The global schema is used to integrate and coordinate the local databases, allowing users to access and query data from multiple sites as if it were a single database.