A complete databases and data engineering curriculum for experienced Rails engineers who use PostgreSQL daily through ActiveRecord but want to go deep beneath the ORM. Built on the field's canonical database books, reinforced with free resources from PostgreSQL official docs, Use The Index Luke, and pgexercises.com. The path runs from SQL foundations through database internals to production DBA expertise and data pipelines.

Join the path to enroll in courses — they unlock in order as you finish each one.

Databases & Data Engineering Media Track #

Companion to: DATABASES_MASTERY_CURRICULUM.md Purpose: Video lectures, YouTube channels, talks, podcasts, and tutorials paired to each module. Databases are best learned by watching experts explain what happens beneath your ActiveRecord queries -- EXPLAIN plans, B-tree walks, WAL internals, and production war stories.

Last updated: April 30, 2026

How to Use This File #

Watch alongside reading. Andy Pavlo's lectures while reading Database Internals. Markus Winand's talks while reading Use The Index Luke.
Break weeks. Between modules, watch a Fireship explainer or a production war story talk.
Mood tags: (Technical), (Inspiring), (Historical), (Fun), (Deep Dive), (Production)

Module 0: SQL Foundations #

Resource	Type	Duration	Mood	Why
Fireship: SQL Explained in 100 Seconds	Video	2 min	Fun	Fastest possible SQL overview.
SQLBolt	Interactive	2-4 hrs	Technical	Best interactive SQL tutorial. Do every exercise.
CMU Database Systems -- Intro (Andy Pavlo)	Lecture	1.5 hrs	Technical	THE database course. Start with Lecture 1 for relational model foundations.
Fireship: 7 Database Paradigms	Video	10 min	Fun	Quick tour of database types. Good mental map before going deep.

Module 1: PostgreSQL Deep Dive #

Resource	Type	Duration	Mood	Why
Postgres Official YouTube	YouTube Channel	varies	Technical	Official PGConf recordings. Primary source for Postgres talks.
Christophe Pettus: PostgreSQL When It's Not Your Job	Talk	45 min	Production	THE talk for Rails devs who need Postgres skills without becoming a DBA. Watch FIRST.
Christophe Pettus: PostgreSQL Worst Practices	Talk	40 min	Fun	Learn what NOT to do. Memorable and practical.
Citus Data Webinars	YouTube Channel	varies	Technical	PostgreSQL scaling, partitioning, and distributed Postgres talks.
PGConf Talks	Talks	varies	Deep Dive	Annual PostgreSQL conference recordings. Search by topic as needed.

Module 2: Schema Design & Data Modeling #

Resource	Type	Duration	Mood	Why
Database Normalization Explained (Decomplexify)	Video	15-30 min	Technical	Visual explanation of 1NF through BCNF. Watch before designing any schema.
Entity Relationship Diagrams Explained	Video	20 min	Technical	ER diagrams are the lingua franca of database design conversations.
Andy Pavlo: Database Design (CMU 15-445)	Lecture	1.5 hrs	Deep Dive	Academic treatment of schema design, normalization, and denormalization tradeoffs.

Module 3: Query Performance & Optimization #

Resource	Type	Duration	Mood	Why
Markus Winand: Indexes -- The Key to Performance	Talk	45 min	Technical	Use The Index Luke author. THE talk on indexing. Watch before reading his book.
EXPLAIN ANALYZE Walkthrough (PostgreSQL)	Video	30 min	Technical	Learn to read query plans. The single most practical database skill.
Vlad Mihalcea YouTube	YouTube Channel	10-30 min each	Deep Dive	JPA/Hibernate focus but database concepts (locking, isolation, indexing) are universal.
Markus Winand: Modern SQL	Talk	40 min	Technical	SQL features most devs don't know exist: window functions, CTEs, lateral joins.

Module 4: Database Internals #

Resource	Type	Duration	Mood	Why
CMU 15-445: Database Systems (Andy Pavlo) -- Full Course	Lecture Series	1.5 hrs each	Deep Dive	THE database internals course. Free on YouTube. Cover storage, B-trees, buffer pools, query processing, concurrency control, recovery. Watch lectures 3-14 alongside Database Internals (Petrov).
Alex Petrov: Database Internals Talks	Talks	40-60 min	Deep Dive	Database Internals author. Covers storage engines, LSM trees, B-trees.
Andy Pavlo: MVCC Explained	Lecture	1.5 hrs	Deep Dive	How PostgreSQL handles concurrent transactions. Essential for understanding Rails locking.

Module 5: NoSQL & Polyglot Persistence #

Resource	Type	Duration	Mood	Why
Fireship: NoSQL Explained in 7 Minutes	Video	7 min	Fun	Quick NoSQL overview before going deep.
MongoDB University	Free Course	varies	Technical	Official MongoDB courses. M001 (Basics) and M320 (Data Modeling) are excellent.
Redis University	Free Course	varies	Technical	Official Redis courses. RU101 (Introduction) and RU301 (Running Redis in Production).
Martin Kleppmann: NoSQL and Consistency	Talk	45 min	Deep Dive	DDIA author explains CAP theorem realities. Cuts through NoSQL marketing.

Module 6: Data Pipelines & Streaming #

Resource	Type	Duration	Mood	Why
Martin Kleppmann: Turning the Database Inside-Out	Talk	45 min	Inspiring	THE talk on event streaming and materialized views. Watch FIRST. Changes how you think about data flow.
Kafka Summit Talks	Talks	varies	Technical	Annual Kafka conference. Search for "Kafka 101" for intros, or specific topics.
Debezium: Change Data Capture Talks	Talks	30-45 min	Technical	CDC from PostgreSQL to Kafka. Directly relevant to Rails event sourcing patterns.
Martin Kleppmann: Event Sourcing and Stream Processing	Talk	50 min	Deep Dive	How event logs become the source of truth.

Module 7: Production DBA Skills #

Resource	Type	Duration	Mood	Why
PGConf: Production PostgreSQL	Talks	varies	Production	Real production Postgres war stories. Search for replication, backup, monitoring.
strong_migrations Gem (Andrew Kane)	Talk/Demo	20 min	Technical	Safe database migrations in Rails. Directly applicable to your daily work.
Zero-Downtime Migrations in Rails	Talks	30-40 min	Production	How to migrate schemas without taking your app down.
Christophe Pettus: PostgreSQL Replication	Talk	45 min	Deep Dive	Streaming replication, logical replication, and failover explained clearly.

Module 8: Capstone & Specialization #

Resource	Type	Duration	Mood	Why
Shopify: Database Scaling Stories	Talk	30-45 min	Inspiring	How Shopify scaled their database layer. Rails at massive scale.
GitHub: MySQL to Vitess Migration	Talk	40 min	Production	Real migration story at GitHub scale.
Stripe: Online Migrations at Scale	Talk	35 min	Production	How Stripe handles schema changes with zero downtime.

Podcasts #

Podcast	Focus	Why
Postgres FM	PostgreSQL	Weekly PostgreSQL podcast. Hosted by Michael Christofides and Nikolay Samokhvalov. Deep Postgres topics.
Software Engineering Daily	Database episodes	Search for PostgreSQL, Redis, Kafka, database internals episodes. High quality interviews.
Data Engineering Podcast	Data engineering	Covers databases, pipelines, streaming, and data infrastructure.
The Changelog	Database episodes	Search for PostgreSQL, SQLite, database-related episodes.

Channel	Focus	Why
CMU Database Group	Database internals	Andy Pavlo's full courses. THE academic database resource. Free.
Hussein Nasser	Database engineering	Deep dives on database internals, networking, and backend engineering. Excellent ACID, indexing, and replication content.
Fireship	Database overviews	Quick, fun database explainers. Good for initial exposure to new database types.
PlanetScale	MySQL, Vitess, scaling	Database scaling content from the Vitess-backed company.
Citus Data	PostgreSQL, distributed	PostgreSQL scaling, partitioning, and Citus extension talks.

Watch one talk per week. Subscribe to Postgres FM. Databases reward depth over breadth -- understand one database engine deeply (PostgreSQL) before branching out.

Databases & Data Engineering Community Guide #

Companion to: DATABASES_MASTERY_CURRICULUM.md Purpose: Newsletters, blogs, forums, conferences, and open-source projects for databases and data engineering. PostgreSQL has the best documentation and one of the most helpful communities in all of software. The database world rewards going deep -- most of what you need is in the Postgres docs and mailing lists.

Last updated: April 30, 2026

Newsletters & Blogs #

Blog/Newsletter	Author/Source	Focus	Why
Postgres Weekly	Cooperpress	PostgreSQL news	THE Postgres newsletter. Subscribe. Weekly roundup of posts, tools, and releases.
DB Weekly	Cooperpress	All databases	Broader database newsletter. Good for staying aware of the non-Postgres world.
Use The Index, Luke	Markus Winand	SQL indexing	Free online book on SQL indexing and query optimization. THE indexing resource. Read cover to cover.
Vlad Mihalcea Blog	Vlad Mihalcea	Database performance	Deep posts on ACID, locking, isolation levels, and connection pooling. JPA-focused but concepts are universal.
Craig Kerstiens Blog	Craig Kerstiens	PostgreSQL for app devs	Former Citus/Heroku Postgres. Practical Postgres posts aimed at application developers, not DBAs.
Brandur Leach Blog	Brandur Leach	Postgres, Stripe	Beautiful writing about Postgres, transactional workflows, and building reliable systems. His ACID series is essential.
Haki Benita	Haki Benita	SQL, query optimization	Django-focused but the SQL and Postgres concepts transfer directly to Rails. Exceptional query optimization posts.
Planet PostgreSQL	Community aggregator	PostgreSQL	Aggregates Postgres blog posts from across the community. Good for discovery.
Alex Petrov Blog	Alex Petrov	Database internals	Database Internals book author. Deep posts on storage engines, distributed systems, and consensus.

Forums & Communities #

Community	Platform	Focus	Why Join
r/PostgreSQL	Reddit	PostgreSQL	Active community. Performance questions, version news, tool recommendations.
r/Database	Reddit	All databases	Broader database discussions. Good for comparing technologies.
r/SQL	Reddit	SQL	SQL help and discussion. Good for tricky query problems.
PostgreSQL Mailing Lists	Mailing Lists	PostgreSQL	pgsql-general and pgsql-performance are gold. Core developers answer questions directly.
DBA Stack Exchange	Stack Exchange	All databases	High quality Q&A for database administration. Postgres and MySQL dominate.
PGSlack (Postgres Slack)	Slack	PostgreSQL	Active Postgres community. Good for real-time help.
Redis Community	Various	Redis	Discord, forums, and mailing lists for Redis.

Conferences (Recordings Available Free) #

Conference	Focus	How to Access	Why
PGConf	PostgreSQL	YouTube (free)	THE PostgreSQL conference. Production talks, internals, new features.
PGDay	PostgreSQL	YouTube (free)	Regional PostgreSQL conferences (Europe, Asia, etc.). More intimate, excellent talks.
Percona Live	MySQL, PostgreSQL, MongoDB	YouTube (free)	Open-source database conference. Good cross-database perspective.
CMU Database Symposium	Database research	YouTube (free)	Academic database research. Andy Pavlo hosts. Cutting-edge database ideas.
DataCouncil	Data engineering	YouTube (free)	Data engineering conference. Pipelines, streaming, and infrastructure talks.
Kafka Summit	Kafka, streaming	YouTube (free)	Annual Kafka conference. Streaming architecture, CDC, and event-driven design.

Open-Source Projects to Study #

Study these for their architecture, patterns, and how they solve database problems.

Database Engines #

Project	What It Is	Why Study
PostgreSQL	The database	Read specific subsystems: `src/backend/access/heap` (storage), `src/backend/optimizer` (query planning), `src/backend/access/transam` (MVCC). Don't try to read all of it.
CockroachDB	Distributed SQL	Go-based distributed PostgreSQL-compatible database. Study its Raft implementation and distributed transactions.
TiDB	Distributed SQL	MySQL-compatible distributed database. Study its storage engine (TiKV) architecture.
Vitess	MySQL sharding	YouTube and GitHub use it. Study its sharding and connection pooling architecture.

Rails Gems #

Gem	What It Does	Why Study
strong_migrations	Safe migrations	Prevents dangerous migrations in production. Read the source -- it's a masterclass in Rails migration safety. USE THIS IN EVERY PROJECT.
PgHero	Postgres dashboard	Database performance dashboard for Rails. Study how it queries pg_stat_statements and pg_stat_user_tables.
Scenic	Database views	Versioned database views in Rails. Study how it manages view migrations.
Marginalia	Query comments	Adds comments to SQL queries showing the controller/action. Invaluable for debugging slow queries in production.
pg_search	Full-text search	PostgreSQL full-text search for Rails. Study how it builds tsvector queries.

Tools #

Tool	What It Does	Why Study
pgcli	Better psql	Auto-completion and syntax highlighting for PostgreSQL CLI. Install and use daily.
pgAdmin	Postgres GUI	Official PostgreSQL GUI. Useful for visual query plans and server monitoring.
pg_stat_statements	Query statistics	Built-in Postgres extension. THE tool for finding slow queries. Enable in every database.
pgbench	Benchmarking	Built-in Postgres benchmarking tool. Use for testing configuration changes and hardware.
pgloader	Data migration	Migrate from MySQL, SQLite, or CSV to PostgreSQL. Useful for database migrations.

People to Follow #

Key voices in the database world. Follow their blogs, talks, and social media.

Person	Known For	Where to Find
Andy Pavlo	CMU database courses, database research	YouTube (CMU Database Group), Twitter
Markus Winand	Use The Index Luke, Modern SQL	modern-sql.com, use-the-index-luke.com
Christophe Pettus	PostgreSQL operations, conference talks	PGConf talks, Twitter
Craig Kerstiens	PostgreSQL for developers	craigkerstiens.com
Brandur Leach	Postgres, reliable systems	brandur.org
Alex Petrov	Database Internals book	databass.dev
Martin Kleppmann	DDIA, stream processing	martin.kleppmann.com
Nikolay Samokhvalov	Postgres FM, Postgres.ai	postgres.fm
Andrew Kane	strong_migrations, PgHero, Blazer	GitHub

Essential Resources #

The resources everyone in the database world references.

Resource	Type	Why
Use The Index, Luke	Free online book	THE SQL indexing resource. Written by Markus Winand. Covers B-tree indexes, query plans, and optimization across all databases. Read this before any performance work.
pgexercises.com	Interactive exercises	Free PostgreSQL exercises. Covers joins, aggregation, window functions, recursive queries. Do all of them.
PostgreSQL Official Docs	Documentation	The best database documentation in existence. Not an exaggeration. The chapters on indexing, MVCC, and query planning are better than most textbooks.
SQLZoo	Interactive tutorial	Step-by-step SQL tutorial with live exercises. Good for filling gaps in SQL knowledge.
Mode Analytics SQL Tutorial	Tutorial	Practical SQL tutorial with real datasets. Covers basics through window functions and performance tuning.
CMU 15-445 Course Page	Course materials	Lecture notes, assignments, and projects from THE database internals course. Free.

PostgreSQL has the best documentation of any database. When in doubt, read the docs first. The mailing lists are where core developers answer questions directly -- use them. Join Postgres FM for weekly listening and Postgres Weekly for weekly reading.