PostgreSQL DBA

The DBA's first real task is a clean, secure server — it sets the tone for everything after.

psql is the DBA's right hand — mastering it saves hours every day.

A DBA doesn't just run the server — fluent SQL is needed to understand and fix production.

PostgreSQL has rich, powerful types — picking the right one saves space and prevents integrity bugs.

Defaults are very conservative — tuning them to your memory and workload can double performance.

Most data leaks come from over-broad privileges — PostgreSQL's role model is your first shield.

The right index turns minutes into milliseconds — the wrong one slows writes for nothing.

PostgreSQL handles concurrency with its distinctive MVCC — understanding it explains locks and bloat.

Because of MVCC, the database accumulates dead tuples — routine maintenance keeps it healthy and fast.

A backup you've never test-restored is no backup. It's the most important lesson for any DBA.

The most urgent production issues are slow queries — reading the plan is the DBA's defining skill.

A single server is a single point of failure. HA keeps service running even when one node dies.

You can't fix what you can't see — monitoring catches problems before users complain.

Each PostgreSQL connection is a heavy process — pooling and partitioning are key to scaling under load.

PostgreSQL's real power is its extension ecosystem — and safe version upgrades are an essential skill.