Why do companies have multiple databases?

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 need multiple databases?

The advantages of using multiple databases You need to run some complex joins to provide some analytical data in your app, which your database takes too long to run, slowing down your response times and disappointing your customers. Again, your team scrambles to work around the issue.

Should you have multiple databases?

Try to avoid multiple databases or tables with the same design or purpose. Multiple database apps are usually apps which have their own data requirements but also have to integrate with another existing app or service's database.

How many databases does a typical company have?

Typically I find that the current industry average is 40 databases to a DBA for large enterprises ($1 billion+ in revenue), with the lowest ratio seen around eight and the highest at 275. So, why this huge variation?