How to Check & Change the DB Directory in PostgreSQL


By squashlabs, Last Updated: October 30, 2023

How to Check & Change the DB Directory in PostgreSQL

Can I change the default database directory in PostgreSQL?

Yes, you can change the default database directory in PostgreSQL by modifying the data_directory configuration parameter in the postgresql.conf file. By default, the data directory is set to /var/lib/postgresql//main on Linux systems and C:\Program Files\PostgreSQL\\data on Windows systems.

To change the default directory, follow these steps:

1. Open the postgresql.conf file in a text editor. The location of this file depends on the operating system and PostgreSQL installation.

2. Search for the data_directory parameter.

3. Modify the parameter value to the desired directory path.

4. Save the changes and restart the PostgreSQL service for the changes to take effect.

Please note that changing the default database directory requires careful consideration and should only be done by experienced administrators. It is recommended to take proper backups and ensure the new directory has the necessary permissions and sufficient disk space.

Related Article: How to Check and Change Postgresql's Default Port

How to check the PostgreSQL database directory?

To check the PostgreSQL database directory, you can use the pg_config command-line utility or query the pg_settings system catalog table.

1. Using pg_config:

pg_config --bindir

This command will display the directory where the PostgreSQL binaries are installed. The database directory is typically located in the same parent directory as the binaries.

2. Using pg_settings:

SELECT current_setting('data_directory');

This SQL query will return the current value of the data_directory configuration parameter, which represents the PostgreSQL database directory.

How is data stored in PostgreSQL?

In PostgreSQL, data is stored in a hierarchical structure. The top-level structure is a database cluster, which consists of multiple databases. Each database contains multiple schemas, and each schema contains multiple tables. Each table is made up of rows and columns, where each row represents a record and each column represents a specific attribute of the record.

Internally, PostgreSQL stores data in files on disk. Each table is stored in a separate file, and each row is stored as a separate record within the file. PostgreSQL uses a combination of heap files, index files, and transaction logs to manage data storage and ensure data integrity.

Additional Resources

How can I check the PostgreSQL database directory?
What is the location of the PostgreSQL database storage?

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