PostgreSQL
Master the database that prioritizes correctness above all else. Transactions, constraints, query planning, and the guarantees that make it the default choice when you need to trust your data.
Architecture & Internals
Process model, shared buffers, WAL, MVCC, and the storage engine. How PostgreSQL actually works under the hood.
Data Types & Schema Design
The full type system — jsonb, arrays, ranges, enums — plus constraints, normalization, and partitioning.
Indexes Deep Dive
B-tree, GIN, GiST, BRIN, partial indexes, covering indexes — the #1 performance lever.
Transactions & Concurrency
ACID guarantees, isolation levels, MVCC mechanics, locking strategies, and concurrency anomalies.
Query Planner & Advanced SQL
EXPLAIN ANALYZE, scan types, join strategies, CTEs, window functions, and lateral joins.
Replication, Pooling & Operations
Streaming replication, logical replication, PgBouncer, VACUUM, backup, and PITR.
Extensions & Performance Tuning
PostGIS, pg_stat_statements, TimescaleDB, Citus, and production configuration tuning.
Why PostgreSQL?
PostgreSQL is about correctness. When your data matters — when you need transactions that actually work, constraints that are actually enforced, and a query planner that makes intelligent decisions — PostgreSQL is the default answer. It has survived 50 years because the relational model is fundamentally sound.
- ✓True ACID compliance — transactions that guarantee correctness, not just speed.
- ✓MVCC for non-blocking reads — readers never block writers, writers never block readers.
- ✓Extensible type system — jsonb, arrays, ranges, PostGIS, and custom types without leaving SQL.
- ✓Cost-based query planner — makes intelligent decisions about how to execute your queries.
- ✓Extension ecosystem — PostGIS, TimescaleDB, Citus, pg_trgm turn it into a specialized engine.