How to fix Undefined file in PostgreSQL

PostgreSQLINTERMEDIATEHIGHUpdated Dec 28, 2025· 161 views

PostgreSQL Error 58P01 occurs when the server cannot locate a required file. This commonly happens with missing extension control files, incorrect file paths in COPY commands, or file permission issues. Fixing it requires verifying file paths, checking permissions, and restarting the database service.

Quick fix

Fixes 58P01

-- Incorrect: File does not exist at this path
COPY my_table FROM '/wrong/path/data.csv' WITH (FORMAT csv);

-- Correct: Use the actual file path
COPY my_table FROM '/home/user/data.csv' WITH (FORMAT csv);
  1. Verify the file path is correct and the file exists
  2. Check file permissions for the PostgreSQL system user
  3. Install or reinstall the missing extension
  4. Use absolute paths in COPY and file-related commands
postgresql — error
-- Incorrect: File does not exist at this path
COPY my_table FROM '/wrong/path/data.csv' WITH (FORMAT csv);
-- Correct: Use the actual file path
COPY my_table FROM '/home/user/data.csv' WITH (FORMAT csv);
Undefined file

What this error means

The PostgreSQL Error Code 58P01 indicates that the database server is unable to find a file it expects to be present. This error typically occurs when PostgreSQL tries to access configuration files, extension control files, or data files during operations like CREATE EXTENSION, COPY commands, or system initialization. The error can manifest in different contexts: extension installation failures, backup restoration issues, or data import operations. The underlying cause is always a file access problem—either the file does not exist at the specified path, the path is incorrect, or the PostgreSQL process lacks permission to read it.

Typical symptoms

  • CREATE EXTENSION command fails with "could not open extension control file"
  • COPY command fails with "could not open file for writing" or "No such file or directory"
  • Database startup fails with undefined file errors in the transaction log
  • PostgreSQL cannot find extension files like postgis.control or other .control files
  • Replication setup fails with file access errors
  • Data import operations fail when referencing external files

Common causes

  1. Extension package is installed but the control file is missing or in the wrong location
  2. The file path specified in a COPY or similar command is incorrect or uses a non-existent path
  3. Extension files (e.g., PostGIS, TimescaleDB) are not properly installed on the system
  4. File permissions prevent the PostgreSQL system user from reading the required file
  5. File has been moved, renamed, or deleted after PostgreSQL was configured to use it
  6. PostgreSQL data directory files are corrupted or missing due to disk issues or improper shutdown
  7. Relative paths are used instead of absolute paths, causing PostgreSQL to look in the wrong directory

How to fix "Undefined file"

1Verify the file path is correct and the file exists

For COPY operations, double-check the file path in your SQL command:

sql
-- Incorrect: File does not exist at this path
COPY my_table FROM '/wrong/path/data.csv' WITH (FORMAT csv);

-- Correct: Use the actual file path
COPY my_table FROM '/home/user/data.csv' WITH (FORMAT csv);

For extension issues, verify the extension is installed:

bash
# On Ubuntu/Debian
ls /usr/share/postgresql/*/extension/

# On CentOS/RHEL
ls /usr/pgsql-*/share/extension/
2Check file permissions for the PostgreSQL system user

The PostgreSQL system user (usually postgres) must have read permissions for the file:

bash
# Check current permissions
ls -l /path/to/file

# Make the file readable by the postgres user
sudo chmod 644 /path/to/file

# If in a directory, ensure the postgres user can enter it
sudo chmod 755 /path/to/directory

# Change ownership if needed
sudo chown postgres:postgres /path/to/file
3Install or reinstall the missing extension

If the error relates to an extension like PostGIS or TimescaleDB, reinstall it:

bash
# For PostGIS on Ubuntu/Debian
sudo apt-get install postgresql-contrib postgresql-<version>-postgis

# For TimescaleDB
sudo apt-get install timescaledb-postgresql-<version>

# Then restart PostgreSQL
sudo systemctl restart postgresql
4Use absolute paths in COPY and file-related commands

Always use absolute paths (starting with /) rather than relative paths when referencing files in SQL:

sql
-- Bad: Relative path (PostgreSQL does not work from your current directory)
COPY my_table FROM './data.csv' WITH (FORMAT csv);

-- Good: Absolute path
COPY my_table FROM '/home/user/data.csv' WITH (FORMAT csv);

-- For COPY TO (exporting), PostgreSQL must write to a directory the postgres user owns
COPY my_table TO '/var/lib/postgresql/export.csv' WITH (FORMAT csv);
5Restart the PostgreSQL service

After making changes to file permissions or reinstalling extensions, restart PostgreSQL:

bash
# On systemd systems
sudo systemctl restart postgresql

# Or use the service command
sudo service postgresql restart

# Verify it is running
sudo systemctl status postgresql

Advanced notes

For COPY operations, be aware that PostgreSQL 9.0+ does not allow COPY TO write to arbitrary file paths for security reasons. The file path must point to a location owned by the PostgreSQL system user or use stdin/stdout. If you need to export data, consider using COPY TO STDOUT and redirecting it in your application code. For development environments using Docker or VM-based PostgreSQL, ensure the container or VM has sufficient disk space and the data directory is properly mounted. If you encounter errors related to pg_xact or base directory files, this indicates potential data directory corruption and may require recovery procedures like using pg_resetwal after careful backup considerations. When chdir() is used within PL/pgSQL procedures, it can cause path resolution issues; avoid changing directories within database functions.

Frequently asked questions

What does "58P01" mean?
The PostgreSQL Error Code 58P01 indicates that the database server is unable to find a file it expects to be present. This error typically occurs when PostgreSQL tries to access configuration files, extension control files, or data files during operations like CREATE EXTENSION, COPY commands, or system initialization. The error can manifest in different contexts: extension installation failures, backup restoration issues, or data import operations.
How do I fix "58P01"?
PostgreSQL Error 58P01 occurs when the server cannot locate a required file. This commonly happens with missing extension control files, incorrect file paths in COPY commands, or file permission issues. Fixing it requires verifying file paths, checking permissions, and restarting the database service.
What causes "58P01"?
Extension package is installed but the control file is missing or in the wrong location The file path specified in a COPY or similar command is incorrect or uses a non-existent path Extension files (e.g., PostGIS, TimescaleDB) are not properly installed on the system
Is the "58P01" error serious?
Yes. This is a high-severity error that usually blocks work until it is fixed, but the steps above resolve it.

Official resources & further reading