I'm new to Prevayler: Best Java settings and practices for Prevayler?

I'm (maybe unjustifiably) scared of potentially big crippling garbage
collections/allocation failures etc., but haven't really experienced them or
how to minimize them.

Should I use a fixed or variable sized heap? If fixed, should it just be as
big as I can make it? (What % of your total memory have you made it?) If
variable, what settings should I best use (Xms, Xmx, Xminf, Xmaxf, Xmine,
Xmaxe)? Should I be conscious of potentally large crippling garbage
collections? If so, should I prefer instance variables over local variables,
or does it matter? Should I induce garbage collection regularly, or just let
it do it itself?

Just wondering if there are any special known best Java settings and
practices for Prevayler because of its potentially big memory size etc.

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