Andres Freund wrote:

> The relevant thread is at
> what I didn't remember is that I voiced concern back then about exactly this:
> ;)

Interesting.  If we consider for a minute that part of the cause for the
slowdown is slowness in pg_clog, maybe we should reconsider the initial
decision to flush as quickly as possible (i.e. adopt a strategy where
walwriter sleeps a bit between two flushes) in light of the group-update
feature for CLOG being proposed by Amit Kapila in another thread -- it
seems that these things might go hand-in-hand.

Álvaro Herrera      
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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