Database

You don't pay for a server; you pay per query. If you run zero queries, you pay zero dollars. Examples: PlanetScale, Neon, Turso. This eliminates "cold starts" and idle costs.

These have been the standard since the 1980s. They structure data into tables (rows and columns), similar to a spreadsheet. database

Database architects balance consistency, availability, and partition tolerance—summarized by the CAP theorem, which states a distributed system cannot simultaneously provide all three during network partitions. Practical systems choose trade-offs based on application needs: CP systems prioritize consistency (e.g., strongly consistent transactions), AP systems favor availability and eventual consistency, and hybrid approaches provide tunable consistency levels. NoSQL Databases:

The concept of a database predates computers by millennia. Ancient scribes in Mesopotamia used clay tablets to catalog crops and taxes—these were the first physical "database records." However, the modern database era began in the 1960s. Cloud Databases:

Having a database is one thing; maintaining it is another. Follow these rules: