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2min chapter
pg_upgrade: the tricky and dangerous parts
Postgres FM
Introduction
PIGI upgrade is kind of a very good tool to upgrade. Some people say, okay, we don't want even some minutes,. Like it will take usually up to a few 10 minutes or 15 minutes depending on cluster size and additional steps you perform. Let's involve logical replication. And here we have a couple of dangers. First of all, if cluster is really huge, it's very challenging toInitialize logical replica because when you initialize it in traditional way, it's fully automated. Most of files in PIGI data is not going to change during upgrade. So hard links help. If it's already new posgos great, it will be done automatically. If it
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