Tom Lane wrote:
> Michael Fuhr <mike@fuhr.org> writes:
> > Further tests show that for this application
> > the killer is stats_command_string, not stats_block_level or
> > stats_row_level.
>
> I tried it with pgbench -c 10, and got these results:
> 41% reduction in TPS rate for stats_command_string

Woh, 41%. That's just off the charts! What are we doing internally
that would cause that?

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