The postgresql.conf comparison tool was created to make it easier to track changes to the database's main configuration file. These configuration options, referred to by the Pg hackers as GUCs ( Grand Unified Configuration), do change over time with major versions. These changes typically reflect new features added, existing features improved, and other changes.

This project is open source and available on GitHub.

This blog post illustrates how this tool can be used to research and prepare for upgrading PostgreSQL major versions.

Configuration data is available for Postgres 10 and newer. Configurations for new versions will be added as they are released.

NOTE: This tool previously included Postgres versions 9.2 through 9.6. Those versions were not included during the rewrite from using `postgresql.conf` directly to using the more robust comparison from `pg_catalog.pg_settings` data.