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expert10 lessons~3h6,900 XP

Database Mastery

Indexes, execution plans, stored functions, and performance optimization — the DBA and senior engineer toolkit.

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Lesson Path Complete each lesson to unlock the next
1

Indexes & Performance

CREATE INDEX

Design indexes that eliminate slow table scans and make queries fly.

20m 3 queries 600 XP

EXPLAIN ANALYZE

EXPLAIN ANALYZE
Locked

Read execution plans to understand exactly how PostgreSQL runs your query.

Complete Indexes & Performance to unlock

Query Optimization

Sargability / N+1 / FILTER
Locked

Identify and fix common performance anti-patterns that slow down production databases.

Complete EXPLAIN ANALYZE to unlock

Stored Functions

CREATE FUNCTION
Locked

Package reusable SQL logic as a named function you can call anywhere.

Complete Query Optimization to unlock

Full-Text Search

to_tsvector / to_tsquery / @@
Locked

Search through text columns intelligently — faster and smarter than LIKE.

Complete Stored Functions to unlock

JSON & JSONB

JSONB / -> / ->> / @>
Locked

Query semi-structured JSON data stored natively in PostgreSQL.

Complete Full-Text Search to unlock

Table Partitioning

PARTITION BY RANGE / LIST
Locked

Split one massive table into smaller physical pieces that queries can skip past entirely.

Complete JSON & JSONB to unlock

Maintenance: VACUUM, ANALYZE & Connection Pooling

VACUUM / ANALYZE / connection pooling
Locked

Keep a production database healthy — reclaim space, keep the planner accurate, and stop running out of connections.

Complete Table Partitioning to unlock

Replication & Backups

Streaming replication / pg_dump
Locked

Understand how production databases survive hardware failure and human mistakes.

Complete Maintenance: VACUUM, ANALYZE & Connection Pooling to unlock

Row-Level Security & Roles

ROW LEVEL SECURITY / POLICY
Locked

Enforce who can see which rows directly in the database, independent of application code.

Complete Replication & Backups to unlock