PostgreSQL statement_timeout (Error 57014): Causes and Prevention

By Sharon Ben-Moshe · September 23, 2026 · 2 min read

Sharon Ben-Moshe is the founder of sqlfmt, a browser-based SQL formatter and validator with misspelled-keyword suggestions across PostgreSQL, MySQL, SQLite, SQL Server, and BigQuery.

Fix PostgreSQL Error 57014: canceling statement due to statement_timeout. Learn how to tune query plans, configure timeouts per session, and avoid lock waits.

Quick answer

PostgreSQL Error 57014 (canceling statement due to statement_timeout) occurs when a query's execution time exceeds the configured statement_timeout limit. This is triggered by unindexed sequential scans, heavy lock contention where the query spends its entire timeout waiting for a table lock, or large unbatched transactions. Fix it by optimizing the query plan with EXPLAIN ANALYZE, creating indexes, or setting session-specific timeouts.

FAQs

What is SQLSTATE 57014 in PostgreSQL?

SQLSTATE 57014 is query_canceled. It indicates that the backend canceled query processing, usually because of statement_timeout, lock_timeout, or a manual pg_cancel_backend() signal.

Can statement_timeout be adjusted for a single transaction?

Yes. You can run `SET LOCAL statement_timeout = '5min';` inside a transaction block, or set it for a specific role or background migration connection.

Does statement_timeout include time spent waiting for locks?

Yes! If another transaction holds an ACCESS EXCLUSIVE lock on a table, your query counts its waiting time against statement_timeout. To fail fast on locks without timing out on execution, configure `lock_timeout` separately.

Why is a global statement_timeout recommended in production?

Without statement_timeout, runaway queries, accidental full-table cross joins, and unindexed analytics queries can consume CPU and connection pool slots indefinitely, degrading the entire database cluster.

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Key takeaways

Differentiate between slow CPU execution (missing indexes) and lock waiting (blocked by DDL or migrations).

Inspect query bottlenecks using EXPLAIN (ANALYZE, BUFFERS) in a staging environment.

Set lock_timeout independently to fail fast when blocked by locks rather than waiting until statement_timeout.

Configure custom timeouts for background migration tasks using SET LOCAL statement_timeout.

Diagnosing the root cause: Lock wait versus slow execution

When a query times out, developers often assume the execution plan is slow. However, if a table migration or vacuum was running, the query might have spent 100% of its time waiting for a lock:

Checking active blocked queries in PostgreSQL

-- Check currently running and blocked queries in pg_stat_activity
SELECT
  pid,
  now() - query_start AS duration,
  wait_event_type,
  wait_event,
  state,
  query
FROM pg_stat_activity
WHERE state != 'idle'
  AND (now() - query_start) > interval '5 seconds'
ORDER BY duration DESC;

Setting per-session and per-migration timeouts

Never disable statement_timeout globally across your entire database. Instead, override the threshold specifically for long-running batch jobs or migration scripts:

Targeted timeout configuration

-- Set a 10-minute timeout for a migration script session
SET statement_timeout = '10min';

-- Inside a transaction, use SET LOCAL so it resets automatically upon COMMIT
BEGIN;
SET LOCAL statement_timeout = '15min';
-- Heavy data backfill operation here
UPDATE orders SET processed = true WHERE processed IS NULL;
COMMIT;

Setting lock_timeout to prevent connection piling

When running migrations in high-traffic applications, set `lock_timeout`. If the lock cannot be acquired within a few seconds, it cancels immediately instead of holding up incoming web requests:

Safe migration pattern with lock_timeout

BEGIN;
-- If unable to acquire table lock within 2 seconds, fail immediately
SET LOCAL lock_timeout = '2s';
SET LOCAL statement_timeout = '30s';

ALTER TABLE user_accounts ADD COLUMN tier VARCHAR(32) DEFAULT 'standard';
COMMIT;

Quick answer

FAQs

What is SQLSTATE 57014 in PostgreSQL?

Can statement_timeout be adjusted for a single transaction?

Does statement_timeout include time spent waiting for locks?

Why is a global statement_timeout recommended in production?

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Key takeaways

Diagnosing the root cause: Lock wait versus slow execution

Setting per-session and per-migration timeouts

Setting lock_timeout to prevent connection piling

Related SQL guides

Official references