unbalanced indexes -> fixed via dump/restore?

from reading various posts over the past month, i glean that
indexes can become lopsided and slow if already-sorted input data
is added to the already-indexed table.

if so, is it good practice to

A)
pg_dump -c mydb > db.out.sql
and then
psql mydb < db.out.sql
periodically?

or is it better to

B) merely 'reindex' on occasion?

what are the pro's and con's of each approach?

--

and, is there a mechanical method to determine IF reindexing is
a productive venture -- i.e. benchmarking routines or
lopsided-ness detector algorithms?

--
It is always hazardous to ask "Why?" in science, but it is often
interesting to do so just the same.
-- Isaac Asimov, 'The Genetic Code'

will(at)serensoft(dot)com
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