Josh Berkus wrote:
> What makes these GUCs worse is that nobody knows how to set them; nobody
> on this list and nobody in the field.  Heck, I doubt 1 in 1000 of our
> users (or 1 in 10 people on this list) know what a multixact *is*.

I won't contend your first statement, but multixacts are explained
in the documentation:

http://www.postgresql.org/docs/9.3/static/routine-vacuuming.html#VACUUM-FOR-MULTIXACT-WRAPAROUND

Yours,
Laurenz Albe

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