How to see/calculate size of index in memory?

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Subject: How to see/calculate size of index in memory?
From: "Sam R." <samruohola@xxxxxxxxx>
Date: Wed, 19 Sep 2018 08:30:49 +0000 (UTC)
References: <1101666388.6439182.1537345849495.ref@mail.yahoo.com>
Reply-to: "Sam R." <samruohola@xxxxxxxxx>

Hi!

I would have following question, if someone could help.

Question 1: How to see/calculate size of index in memory?
BTree, hash index.

I can see size of index e.g. with pg_relation_size FROM pg_class (after reindex). Does that tell size of index on disk?

I would be interested how big part of index is in memory. (Whole index?)

PG10/PG11.

Best Regards, Sam

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