Re: Calculating how much redo log space has been used

From: Andres Freund <andres(at)anarazel(dot)de>
To: Reza Taheri <rtaheri(at)vmware(dot)com>
Cc: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Calculating how much redo log space has been used
Date: 2018-08-14 19:31:18
Message-ID: 20180814193118.65ohih2n3n4ojc7y@alap3.anarazel.de
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Hi,

On 2018-08-14 18:51:34 +0000, Reza Taheri wrote:
> Also, it looks like the full_page_writes parameter is the only thing
> that can help reduce the log usage size

There's also wal_compression.

> Another requirement is a very short, 6-minute checkpoint time, which
> means we will likely write the full page very often. Yes, my hands are
> tied!

Why is that a requirement / how is specifically phrased? Is it a bounded
recovery time?

Greetings,

Andres Freund

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