How much data was stored in the database (in KB/GB)?

In one of the projects where I worked as a senior Java developer, the database contained about 50-100 GB of data. It was a relational database with a large amount of historical data and logs.

The volume of data influenced the choice of architecture and query optimization, as well as backup and scaling strategies. To ensure performance, we used indexes, table partitioning, and caching.

In other projects, the volumes could be smaller — from a few hundred megabytes to several gigabytes, depending on the specifics and requirements.