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From: Sergei Kornilov <[email protected]>
To: jian he <[email protected]>
Cc: Pg Hackers <[email protected]>
Cc: Antonin Houska <[email protected]>
Cc: Mihail Nikalayeu <[email protected]>
Cc: Robert Treat <[email protected]>
Cc: Alvaro Herrera <[email protected]>
Subject: Re: Adding REPACK [concurrently]
Date: Sat, 01 Nov 2025 15:53:33 +0300
Message-ID: <3436011762001613@a7af8471-b1b8-48c2-9ff7-631187067407> (raw)
In-Reply-To: <CACJufxFO-rU4+kQZUPuukPpY7-i1DPgKBsz+O2SK1XxdTivajQ@mail.gmail.com>
References: <[email protected]>
	<[email protected]>
	<CACJufxFO-rU4+kQZUPuukPpY7-i1DPgKBsz+O2SK1XxdTivajQ@mail.gmail.com>

Hello!

> but materialized views don't have bloat, nothing can be removed.

REFRESH MATERIALIZED VIEW CONCURRENTLY does not replace relation completely but updates the relation using insert and delete queries (refresh_by_match_merge in src/backend/commands/matview.c) - so there may be bloat.

regards, Sergei

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