MySQL 8.4 disables AHI – Why and What you need to know

January 19, 2026

MySQL 8.4 changed the InnoDB adaptive hash index (innodb_adaptive_hash_index) default from ON to OFF, a major shift after years of it being enabled by default. Note that the MySQL adaptive hash index (AHI) feature remains fully available…

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How to checksum on AWS RDS for MySQL Replication 8.0 > 8.4

November 4, 2025

During a MySQL upgrade process the RDS replication between MySQL 8.0 and 8.4 was configured. I wanted to ensure the data was consistent for any random reason. This post is…

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What MySQL configuration you hate the most?

September 23, 2025

Ever spent your weekend debugging a MySQL production issue that could have been avoided with better configuration? I have, and it’s beyond frustrating. I have prepared my list of the…

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How to use tmux, a cheat sheet

August 18, 2025

I think we know that screen is officially old news and most modern Linux systems switched to tmux as the recommended multiplexer with RHEL 8. Recently I had a discussion…

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How to migrate PMM (Grafana) users

August 4, 2025

You’ve got a shiny new Percona Monitoring & Management instance standing by and want to move existing users over. This blog is a quick work around for migrating PMM users…

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