The reason the default is currently 10 is just conservatism: it was
already an order of magnitude better than what it replaced (a *single*
representative value) and I didn't feel I had the evidence to justify
higher values. It's become clear that the default ought to be higher,
but I've still got no good fix on a more reasonable default. 100 might
be too much, or then again maybe not.
My hands on experience is that 10 is plenty except for the minority of
tables within a database. Those table can be accurately represented
using alter table without having to adjust the global.
That being said, 10 is fairly small and I often find myself setting the
value to at least 250 just to keep it out of my way.
Sincerely,
Joshua D. Drake
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