People having experience with commercial RDBMS are used to have the ability to answer the question “What a particular session is doing right now?” Or even “What was that session waiting 5 minutes ago?” For a long time PostgreSQL did not have such diagnostic tools and DBAs used to get …

Preface

Once upon a time we started having strange performance issues with writing-only load on PostgreSQL 9.4 with huge shared_buffers. The problem itself is well described here but it is not the topic of the post. And since PostgreSQL does not have something like Oracle wait events interface …