Every bad execution plan you’ve ever debugged traces back to the same root cause. The optimizer made a wrong guess about how many rows an operation would return ..and built an entire plan on top of that wrong number.

That number is called cardinality. It’s the estimated row count for each operation in your plan. Get it right and the optimizer picks ...

If you’ve been working with Oracle for a while, you’ve probably hit a wall with constraints at some point. Primary keys, foreign keys, check constraints .. they’re great, but they all have one thing in common: they only work within a single row, or between two specific tables in a fixed relationship.

What happens when your business rule spans multiple rows? Or cross...

Modern enterprise architectures rarely live inside a single database engine anymore. It is very common to see operational data stored in relational systems like Oracle while analytics or distributed applications rely on NoSQL platforms such as Cassandra.

In several real-world projects I have worked on, Cassandra clusters were used to power high-volume applications w...