destroydb doesn't close connection with client (httpd <-> pg)

I have Web site where I use persistent connection between
httpd (Apache) and database (postgres,6.5). I noticed strange
results I got after reloading page with results from query
when I destroydb , createdb, fill db ( with the same data ).
It seems backend doesn't close connection when db is destroyed
and this produces unpredictable results. My application is
written in Perl  and uses DBI/DBD for persistent connection.
I don't know is it DBI/DBD problem or backend must close
all connections to DB when it destroyed.
Regards,    Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83