I always try to scope such mapping hashes to the subs that need them. Only dsi_dsn needs the %map, so why make it available to other subs? There's also no point in having it global.
This is exactly why I suggested the alternative of creating a new enclosing scope, as in: 
{
  my %map = (...);
  sub dbs_dsn { ... }
}

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Even for a sub that isn't called very often, why do the work every time and throw it away, when you can do it just once? 
   MeowChow                                   
               s aamecha.s a..a\u$&owag.print

In reply to (MeowChow) Re3: DBIx::PearDSN by MeowChow
in thread DBIx::PearDSN by Juerd

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