Schedule - PGConf.DE 2023
LFMF: how a CREATE INDEX CONCURRENTLY led to a 6 hour downtime
Date: 2023-06-27
Time: 15:55–16:45
Room: Saal A2
Level: Intermediate
War story time!
My client - who prefers to remain unnamed - introduced a new table with an ON DELETE CASCADE foreign key. Which wasn't backed by an appropriate index. Creating that missing index (and a couple of bad decisions, some of them many years in the past) led to a downtime of about six (!) hours.
The talk
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describes* what happened
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then explains what happened and
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shows which decisions - by the client, the DBA (me), but also the PostgreSQL developers TBH - caused the catastrophic course of events
Obviously, we'll also discuss the lessons learned and which measures were taken to prevent a reoccurence.
This completely took me by surprise (and what an unpleasant one!), so:
Learn from my fail!
Slides
The following slides have been made available for this session: