Re: Slow WAL recovery for DROP TABLE

From: Jeff Janes <jeff(dot)janes(at)gmail(dot)com>
To: Sherrylyn Branchaw <sbranchaw(at)gmail(dot)com>
Cc: Postgres General <pgsql-general(at)postgresql(dot)org>
Subject: Re: Slow WAL recovery for DROP TABLE
Date: 2018-07-17 17:03:47
Message-ID: CAMkU=1znu3UnsunV_kODRKJEy-K-Kh9qmvvz3wC3EY4Wi6-8TQ@mail.gmail.com
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There was a recent commit for a similar performance problem, which will
appear in 9.6.10. But that was specifically for cases where there were
multiple dropped tables per transaction, and large shared_buffers.

I can't reproduce your single-drop-per-transaction problem. The replica
has no problem keeping up with the master.

Can you share the reproduction scripts, and any non-default config
settings? Especially the setting of shared_buffers (on both master and
replica, if different)

Cheers,

Jeff

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