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This category contains 4 posts

A Hairy PostgreSQL Incident

Posted by Jeremy ⋅ February 10, 2022 ⋅ 24 Comments

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

Posted by Jeremy ⋅ July 26, 2021 ⋅ Leave a comment

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

Posted by Jeremy ⋅ July 6, 2021 ⋅ 1 Comment

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

Posted by Jeremy ⋅ November 8, 2019 ⋅ 1 Comment

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 →