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Nightmare on Collation Street - April 7, 2026

Speakers:  Evgeniy Patlan

Character collations - the rules for comparing and sorting character strings - are not universal, even languages which use the same characters may sort them differently. These rules may also not be stable, and the libraries implementing them may have errors, requiring fixes and updates. When character string data is indexed or partitioned under one set of rules, then queried under another, it may create some problems.

Join Jan and Alastair for a discussion about how this becomes your Postgres database’s problem, when it may come for you, and how to avoid trouble. We’ll give you one spoiler, running upstairs is no more useful here than in any slasher movie.

Join our Open Source Unplugged!

Percona Open Source Unplugged Nightmare on Collation Street
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Speaker Bios

Evgeniy Patlan

Manager, Build & Release Engineering, Percona

Evgeniy Patlan is Manager, Build & Release Engineering Team at Percona. He is experienced Build And Release Engineer, Software Engineer with a demonstrated history of working in the information technology and services industry. Skilled in Perl, JavaScript, Python, Session Initiation Protocol (SIP), SOAP, and Linux System Administration. Strong engineering professional with a specialist focused in Computer systems, Programming, System Administrating, Network Technologies.

See all talks by Evgeniy Patlan »

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