Severalnines Blog

PostgreSQL + ClickHouse Recovery: Test the Whole Data Service

November 13, 2026 Jessie Baynas
A restore job finishes green. PostgreSQL is taking orders, ClickHouse is answering queries, and the revenue dashboard loads without errors. Then someone from finance asks why January 15 shows 12,750 in revenue when the order system says 12,350. Nothing is down and no alert has fired. The numbers are simply...

MySQL Troubleshooting with pt-stalk: Part 2

December 21, 2015 Krzysztof Ksiazek

MySQL Troubleshooting with pt-stalk: Part 1

December 10, 2015 Krzysztof Ksiazek

Severalnines Aims for the Stars With EGO Boost

November 25, 2015 Jean-Jérôme Schmidt

Troubleshooting Galera Cluster Issues: Part 2

November 20, 2015 Krzysztof Ksiazek

Troubleshooting Galera Cluster Issues: Part 1

November 17, 2015 Krzysztof Ksiazek

A Guide to Max Open Files for MySQL

November 16, 2015 Ashraf Sharif