Do you think it's a good idea to save billions of images into Database?

Question

Recently, I and my colleagues, we are discussing how to build a huge storage systems which could store billions a pictures which could searched and download quickly.

Answer 1

It's not a good idea. The point of a database is that you can quickly resolve complex queries to retrieve textual data. While binary data can be stored in a database, it can slow transactions. This is especially true when the database is on a separate server from the running application. In the database, store meta-data and the location/filename of the images. Images themselves should be on static server(s).