Interpreting the results and exit codes of your upgrade tests is essential for assessing the process’s outcome. In this blog, we’ll explore the significance of pt-upgrade return codes and how…

The post Understanding Return Codes of pt-upgrade: A quick guide first appeared on Change Is Inevitable.

My last blog, Percona Utilities That Make Major MySQL Version Upgrades Easier, detailed the tools available from the Percona toolkit that assists us with major MySQL version upgrades. The pt-upgrade tool aids in testing application queries and generates reports on how each question performs on servers running various versions of MySQL.

MySQL Shell Upgrade Checker is a utility that helps in compatibility tests between MySQL 5.7 instances and MySQL 8.0 upgrades, which is part of the mysql-shell-utilities. The util.checkForServerUpgrade() function checks whether the MySQL 5.7 instance is ready for the MySQL 8.0 upgrade and generates a report with warnings, errors, and notices for preparing the current MySQL 5.7 setup for upgrading to MySQL 8.0.

We can run this Upgrade Checker Utility in the current MySQL 5.7 …

Whenever we do upgrades for our clients from one major version of MySQL to another we strongly recommend to test in two forms.

First, it would be a performance test between the old version and the new version to make sure there aren’t going to be any unexpected issues with the query processing rates. Secondly, do a functional test to ensure all queries that are running on the old version will not have syntactic errors or problems with reserved words in the new version that we’re upgrading to.

If a client doesn’t have an appropriate testing platform to perform these types of tests, we will leverage available tools to test to the best of our ability. More often than not this includes using pt-upgrade after capturing slow logs with …