Optimizing PostgreSQL Queries with Partial Indexes and Materialized Views

1. The Cost of Full Table Scans

As database tables grow beyond millions of rows, unindexed queries cause CPU spikes and high disc I/O latencies. Partial indexes solve this by indexing only the specific subset of rows relevant to frequent queries.

2. Implementing Partial Indexes

-- Index only active published posts
CREATE INDEX idx_published_posts 
ON posts (published_at DESC) 
WHERE status = 'published';

3. Accelerating Dashboards with Materialized Views

Materialized views persist query results on disk, allowing heavy aggregate calculations (like total views, author metrics, and reader engagement) to be returned in single-digit milliseconds.

REFRESH MATERIALIZED VIEW CONCURRENTLY author_analytics_summary;