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Researching the Performance Puzzle

The PostgreSQL Performance Puzzle was, perhaps, too easy – it didn’t take long for someone to guess the correct answer! But I didn’t see much discussion about why the difference or what was happening. My emphasis on the magnitude of the difference was a tip-off that there’s much more than meets the eye with this … Continue reading

PostgreSQL Performance Puzzle

Update 7/18: y’all guessed the answer to my puzzle very fast! At the bottom of this blog post, I’ve added the expressions that I used (with credit to those who guessed it), and also other expressions guessed by readers which exhibited similar behavior. I’ll do another follow-up blog post touching on several layers of this … Continue reading

A Hairy PostgreSQL Incident

It was 5:17pm today, just as I was wrapping up work for the day, and my manager pinged me with the following chat: <manager>: Hi Jeremy – we have a <other team> ticket – escalated to <leader>, <leader>, etc. <principal> is on trying to advise as well. Are you available this evening if needed for … Continue reading

PostgreSQL Logical Replicas and Snapshots: Proceed Carefully

Earlier this year, Christos Christoudias – an Engineer from Instacart – published an article on Medium about Creating a Logical Replica from a Snapshot in RDS Postgres. Recently I’ve seen discussions about this article a few times, in a few different places. Is it safe? Is it ok to do this? A little under a … Continue reading

Paranoid SQL Execution on Postgres

Suppose that you want to be completely over-the-top paranoid about making sure that when you execute some particular SQL statement on your Postgres database, you’re doing it in the safest and least risky way? For example, suppose it’s the production database behind your successful startup’s main commercial website. If anything even causes queries to block/pause … Continue reading

PostgreSQL Invalid Page and Checksum Verification Failed

At the Seattle PostgreSQL User Group meetup this past Tuesday, we got onto the topic of invalid pages in PostgreSQL. It was a fun discussion and it made me realize that it’d be worth writing down a bunch of the stuff we talked about – it might be interesting to a few more people too! … Continue reading

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This is my personal website. The views expressed here are mine alone and may not reflect the views of my employer.

contact: 312-725-9249 or schneider @ ardentperf.com


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