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I can quickly query the database name with SELECT current_database(); but I've been searching for way to also query the cluster name and version with no luck - hoping someone can suggest a solution.

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  • cannot retract a question after I've found an answer: select name || '=' || setting from pg_settings where name in ('port','cluster_name');
    – Reinsbrain
    Jul 9, 2019 at 10:10
  • 2
    You could always self-answer (if your solution is materially different to the answers already posted) and accept your own answer if you feel it best suits your question. 😉
    – Peter Vandivier
    Jul 9, 2019 at 10:14

2 Answers 2

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8

That would be

SELECT current_setting('cluster_name'), current_setting('server_version');

You can get all parameters that way. For automated processing, server_version_num is often better.

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  • I mistakenly presumed you can only find settings that are defined in postgresql.conf and now know otherwise - I'm a little more powerful postgresql dev now thanks to @Laurenz Albe
    – Reinsbrain
    Jul 9, 2019 at 10:26
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You can also query the pg_settings view

SELECT name, setting FROM pg_settings WHERE name in ('cluster_name','server_version','port');

@Laurenz Albe suggests using current_setting() which makes it easier to select results in a single row

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