Cookbook recipe

Detach and attach partitions with minimal locking

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

Rolling off old data or loading a prepared partition should not lock the whole table. Use CONCURRENTLY-style attach/detach. Diagnose it Detach without a long lock (PG 14+): ALTER TABLE events DETACH PARTITION events_2025_01 CONCURRENTLY; Why it…

Investigation Path

Rolling off old data or loading a prepared partition should not lock the whole table. Use CONCURRENTLY-style attach/detach.

Diagnose it

Detach without a long lock (PG 14+):

ALTER TABLE events DETACH PARTITION events_2025_01 CONCURRENTLY;

Why it happens

Plain ATTACH/DETACH take strong locks while validating constraints. The CONCURRENTLY form and pre-validated CHECK constraints let you avoid blocking the parent table.

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

Online schema changes without long locks Keyset pagination instead of OFFSET Deadlock rate spiking — finding and eliminating the cause Expand/Contract: The Pattern Behind Every Safe Migration Point-in-time recovery (PITR) with base backup + WAL

Concepts on this page

Partitioning Constraint Lock
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