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help / color / mirror / Atom feedFrom: Greg Sabino Mullane <[email protected]>
To: Dirk Krautschick <[email protected]>
Cc: [email protected]
Subject: Re: performance impact on read replicas during heavy vacuums on primary
Date: Wed, 4 Feb 2026 11:29:07 -0500
Message-ID: <CAKAnmmKSnCSqiJuGT83z33jajq4w0QvKAMzKeMjUTxxoiP_vag@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
Is this a theoretical question, or have you seen performance issues? Yes,
it is certainly possible for vacuum to affect the replica performance. More
vacuum activity means more WAL means more WAL replay on the replica, using
up CPU and I/O. In most real-world cases, this will not be a problem, as
the replica should be able to keep up quite well even for near-constant
vacuum activity. You would need a very high WAL volume and a very
underprovisioned replica before seeing any ill effects. There are plenty of
other performance bottlenecks that will likely hit you before this one.
Cheers,
Greg
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Subject: Re: performance impact on read replicas during heavy vacuums on primary
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