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Re: max_wal_senders must die - Mailing list pgsql-hackers

From Tom Lane
Subject Re: max_wal_senders must die
Date
Msg-id 26313.1287585615@sss.pgh.pa.us
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In response to Re: max_wal_senders must die  (Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>)
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Heikki Linnakangas <heikki.linnakangas@enterprisedb.com> writes:
> Going from wal_level='minimal' to 'archivë́' incurs the penalty on 
> WAL-logging COPY etc. That's a big penalty. However, the difference 
> between wal_level='archive' and wal_level='hot_standby' should be tiny.

I'm not sure I believe that either, because of the costs associated with
logging lock acquisitions.

We really need some actual benchmarks in this area, rather than
handwaving ...
        regards, tom lane

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