Well, this tool has been widely used elsewhere from QA, to dev, to production environments. Some may consider pg_upgrade to be dangerous, especially for the production environment.
(The community will attempt to avoid such situations.) If a future major release ever changes the data storage format in a way that makes the old data format unreadable, pg_upgrade will not be usable for such upgrades. pg_upgrade uses this fact to perform rapid upgrades by creating new system tables and simply reusing the old user data files. PostgreSQL, especially for major version releases, is known to have new features added that often change the layout of the system tables, but the internal data storage format rarely changes. This works without needing a data dump/reload, which can take some time if you have a big dataset. When upgrading your PostgreSQL to a major version with pg_upgrade, the tool works by allowing the data stored in PostgreSQL data files to be upgraded to a later PostgreSQL major version. Using this tool is not required for minor version upgrades, which means that upgrading your current version of 11.9 to 11.13 is not necessary. Pg_upgrade has been around for a very long time as a tool for upgrading major versions of PostgreSQL. In this blog, we’ll walk through an example of this challenge while having a TimescaleDB and PostGIS installed on an existing PostgreSQL 11 host. PostgreSQL does not lock you up on a specific version to use.
If you are facing this type of problem, don’t worry. Upgrading PostgreSQL comes with a few challenges as it’s not as easy compared to other mainstream databases. Some of the main reasons for this are to take advantage of its critical enhancements to its built-in functionalities, security updates, performance improvements, and new implementations beneficial for database management. There are many reasons why upgrading to the latest version is a must. Businesses and enterprises using old versions of PostgreSQL (PG) face challenges when upgrading to at least the most recent stable version from PostgreSQL 12 or PostgreSQL 13.
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