Re: Adding REPACK [concurrently]

From: Sergei Kornilov <sk(at)zsrv(dot)org>
To: jian he <jian(dot)universality(at)gmail(dot)com>
Cc: Pg Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Antonin Houska <ah(at)cybertec(dot)at>, Mihail Nikalayeu <mihailnikalayeu(at)gmail(dot)com>, Robert Treat <rob(at)xzilla(dot)net>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
Subject: Re: Adding REPACK [concurrently]
Date: 2025-11-01 12:53:33
Message-ID: 3436011762001613@a7af8471-b1b8-48c2-9ff7-631187067407
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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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