data_corrupted Data Corrupted — SQLSTATE XX001

PostgreSQL detected corrupted data on disk.

• The error is written to the server log and returned to the client carrying SQLSTATE XX001.
• Any driver (libpq, JDBC, psycopg, npgsql, pgx) surfaces this code in its error object so you can branch on it programmatically.

Severity: PANIC  |  PostgreSQL versions: 12, 13, 14, 15, 16, 17

Indicates a system- or storage-level problem; inspect OS logs, disk health, and any recent hardware or filesystem changes.

A page failed verification (checksum or structural check) — the stored data is damaged.

Common causes:

• A bad disk or memory (non-ECC).
• Power loss without proper fsync.
• Filesystem or storage misconfiguration.

Steps to resolve XX001:

1. Stop writing to the affected system and take a physical copy before any repair.
2. Restore from a verified backup — this is the safe path.
3. As a last resort, zero_damaged_pages can read past damage but discards corrupt pages and risks data loss; use only with guidance and a backup.
4. Enable data checksums and ECC memory to catch problems earlier.

Reference: PostgreSQL error codes — Class XX (Internal Error).