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I need it in order to create a new database with initdb with the same locale, otherwise pg_upgrade will fail.

2 Answers 2

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One option is to use psql -l, but it outputs many lines if there a lot of databases.

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When upgrading to postgresql 16 or later, this is no longer relevant. The locale and encoding match requirement has been removed as redundant, pg_upgrade now copies the encoding settings itself: https://github.com/postgres/postgres/commit/9637badd9f9209166140eb567602e91699dd2ffb

When upgrading to postgresql 15 or older, the most important are the locale settings for the database named template0.

psql -c '\l template0'

initdb should be called with same --encoding=... --locale=... --lc-collate=...

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