Incident-Report on Vonng

How to Use pg_filedump for Data Recovery?

rh@vonng.com (Ruohang Feng) — Wed, 27 Sep 2023 00:00:00 +0000

Backups are a DBA’s lifeline — but what if your PostgreSQL database has already exploded and you have no backups? Maybe pg_filedump can help you!

Incident-Report: Patroni Failure Due to Time Travel

rh@vonng.com (Ruohang Feng) — Mon, 22 Feb 2021 00:00:00 +0000

Machine restarted due to failure, NTP service corrected PG time after PG startup, causing Patroni to fail to start.

Incident: PostgreSQL Extension Installation Causes Connection Failure

rh@vonng.com (Ruohang Feng) — Thu, 13 Jun 2019 00:00:00 +0000

Today encountered an interesting case where a customer reported database connection issues caused by extensions.

Incident-Report: Connection-Pool Contamination Caused by pg_dump

rh@vonng.com (Ruohang Feng) — Tue, 11 Dec 2018 00:00:00 +0000

Sometimes, interactions between components manifest in subtle ways. For example, using pg_dump to export data from a connection pool can cause connection pool contamination issues.

PostgreSQL Data Page Corruption Repair

rh@vonng.com (Ruohang Feng) — Thu, 29 Nov 2018 00:00:00 +0000

Using binary editing to repair PostgreSQL data pages, and how to make a primary key query return two records.

Incident-Report: Integer Overflow from Rapid Sequence Number Consumption

rh@vonng.com (Ruohang Feng) — Fri, 20 Jul 2018 00:00:00 +0000

If you use Integer sequences on tables, you should consider potential overflow scenarios.

Incident-Report: PostgreSQL Transaction ID Wraparound

rh@vonng.com (Ruohang Feng) — Fri, 20 Jul 2018 00:00:00 +0000

XID WrapAround is perhaps a unique type of failure specific to PostgreSQL

Incident-Report: Uneven Load Avalanche

rh@vonng.com (Ruohang Feng) — Sun, 08 Apr 2018 00:00:00 +0000

Recently there was a perplexing incident where a database had half its data volume and load migrated away, but ended up being overwhelmed due to increased load.