PostgreSQL Tips Every Developer Should Know

Beyond Basic Queries

PostgreSQL is more than a relational database. These tips unlock its full potential.

1. Use EXPLAIN ANALYZE Religiously

Every slow query should start with EXPLAIN ANALYZE. It shows the actual execution plan and timing.

Look for sequential scans on large tables (add an index), nested loops with high row counts, and sorting operations on large result sets.

2. Partial Indexes Save Space

If you query active records 99% of the time, index only those. A partial index is smaller, faster to maintain, and more efficient for your actual queries.

3. JSONB Is Your Friend

Need flexible schema for some fields? Use JSONB. Gin indexes on JSONB columns make queries fast.

4. Connection Pooling Is Not Optional

Every connection costs approximately 10MB of RAM. At 100 connections, that is 1GB just for connections. Use PgBouncer or Neon connection pooling.

5. Use Transactions for Multi-Table Operations

Any operation that touches multiple tables should be in a transaction. If either fails, both roll back.

6. Generated Columns for Computed Values

Instead of computing in application code, use generated columns. Always accurate, always fast to query.

7. BRIN Indexes for Time-Series Data

For data inserted in chronological order, BRIN indexes are tiny and effective. A BRIN index on 1 billion rows might be 1MB versus 20GB for B-tree.

Conclusion

PostgreSQL rewards the developer who learns its features. These tips cover the most impactful patterns for real-world applications.