DELETE Doesn’t Delete Data: Understanding DELETE, VACUUM, and Time Travel in Delta Lake

I spent the first 8 years of my career in domains full of sensitive PII, PHI, and HIPAA regulations. In 2026 I was brought into a Xorbix team that had been deliberate in its AI adoption for years before my arrival.  As I’ve worked to catch up with the rest of the team, some of the clearest lessons have come from our Pull Request (PR) review process.

Auto Loader vs COPY INTO in Databricks: A Decision Guide for Data Engineers

In modern lakehouse pipelines, one of the first ingestion decisions data engineers face is whether to use Auto Loader or COPY INTO. Both can load files incrementally into Delta tables, but they solve very different operational problems. Choosing the wrong one can impact scalability, cost, reliability, and maintenance overhead.