Cookbook recipe

BRIN indexes for huge append-only tables

Applies to PostgreSQL 13–17 Last reviewed May 2026 Grounded in source

What This Is

A production experience capsule based on real incident patterns.

Why It Matters

Builds production judgment under pressure.

Next Step

Run the decision point → · Enter full simulator →

Estimated investigation4 min

Scenario

A billion-row time-series table cannot afford a b-tree the size of the data. A BRIN index summarizes block ranges and is thousands of times smaller. Diagnose it Build a BRIN on the naturally-ordered column: CREATE INDEX…

Investigation Path

A billion-row time-series table cannot afford a b-tree the size of the data. A BRIN index summarizes block ranges and is thousands of times smaller.

Diagnose it

Build a BRIN on the naturally-ordered column:

CREATE INDEX idx_metrics_brin
  ON metrics USING brin (recorded_at)
  WITH (pages_per_range = 128);

Why it happens

BRIN stores the min/max of a column per block range. When data is physically ordered (append-only by time), the planner skips entire ranges that cannot match, scanning only relevant blocks — at a fraction of a b-tree size.

This is a Pro lesson

Get every Learning Pathway and cookbook recipe — grounded in PostgreSQL source code, with diagnostics, fixes, and prevention for each topic.

Continue this lesson to learn:

  • How to fix it
  • Prevent it next time
  • Related & next steps
  • All 36 Learning Pathway lessons
  • 170+ cookbook recipes
  • Source-grounded diagnostics & fixes
Unlock everything — $24.99/month $199/year — save 35%

Secure checkout Cancel anytime Source-grounded

Career Impact

This scenario builds production judgment and operational confidence under pressure.

Open Career Dashboard →

Keep going

Related & next steps

More like this

Tame autovacuum on a high-churn table What ANALYZE collects and why plans depend on it Index Not Being Used pg_control File Corrupt Deadlock rate spiking — finding and eliminating the cause

Concepts on this page

Partitioning Query planner Index
Browse the cookbook Step-by-step recipes Follow a pathway Learn it in order Open the glossary Every concept, plainly
Was this helpful?

← All cookbook recipes