Can a webpage have multiple databases?

[Hi P]

Just curiosity, I work for a startup and all we do is simple CRUD web apps, and each of them has a single database (with tons of tables).

Is that normal or are there cases were you need multiple databases?

 

Thank you

 

[mariushm]

Yes, of course there are cases where you may have multiple databases each with multiple tables.

can be for various reasons... ex each database on separate server or clusters of servers , or one database containing stuff that's common to multiple websites like product details, pictures, specifications,, separate websites each with their own user database and all that.

You may have a postrgress sql / mysql database for some specific data, you may have a memory database to cache stuff (memcached / other databases), you may have a noSQL database ex Apache cassandra, mongoDB etc etc for various needs (temporary databases, caching, static content etc