PostgreSQL Locking and Concurrency Control
Learn about shared vs exclusive locks, lock escalation, deadlocks, optimistic vs pessimistic concurrency control, and FOR UPDATE clauses.
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Materialized Views
Precomputed query results stored as tables. PostgreSQL refresh strategies, indexes on materialized views, and when to use them vs views or denormalization.
Database Normalization: From 1NF to BCNF
Learn database normalization from 1NF through BCNF. Understand how normalization eliminates redundancy, prevents update anomalies, and when denormalization makes sense for performance.
Primary and Foreign Keys: A Practical Guide
Learn the difference between natural and surrogate keys, how foreign keys enforce referential integrity, cascade rules, and best practices for constraint naming.
Query Execution Plans: Reading EXPLAIN Output Like a Pro
Learn to decode PostgreSQL EXPLAIN output, understand sequential vs index scans, optimize join orders, and compare bitmap heap scans with index-only scans.
Query Rewriting: Subqueries, CTEs, Joins, Window Functions
Learn when to use subqueries vs joins vs CTEs, effective CTE patterns, IN vs EXISTS, OR to UNION rewrites, and avoiding SELECT *.
Read/Write Splitting
Master-slave replication for read scaling. Routing strategies, consistency lag considerations, and when this pattern helps vs hurts your architecture.
Schema Design: Building the Foundation of Your Database
Learn how to design effective database schemas with proper data types, constraints, and relationships that scale with your application.
Isolation Levels: READ COMMITTED Through SERIALIZABLE
Understand READ COMMITTED, REPEATABLE READ, and SERIALIZABLE isolation levels, read vs write anomalies, and SET TRANSACTION syntax.
Vacuuming and Reindexing in PostgreSQL
PostgreSQL's MVCC requires regular maintenance. This guide explains dead tuples, VACUUM vs VACUUM FULL, autovacuum tuning, REINDEX strategies, and how to monitor bloat with pg_stat_user_tables.