Why should you have multiple databases?

Why is it important to use multiple databases?

In summary, systematic reviews use scientific methods to summarize results from multiple research studies. A combination of multiple databases would yield more articles than Medline alone, which can help us to make accurate decisions.

Is it good to have multiple databases?

Not really. There are certainly circumstances where it's required or even desirable, but those are for specific use cases. In general you don't want to for a combination of relational integrity (difficult to enforce across databases) and transactional integrity.

Why do organizations have multiple databases?

Why do organizations create multiple databases? First, because of resource limitations, organizations fund development of their information systems one application at a time. Second, organizations may acquire some of their information systems from outside vendors. This also results in a proliferation of databases.

Why do we separate databases?

Advantages: Isolated database cannot be stopped by overloaded processes on the web/application server. The database is further isolated from a security perspective. Problem diagnosis and performance monitoring is easier as the web and database loads are separated.