use Log::Log4perl;

sub set_session_id {
  my ($class) = shift;
  my ($session_id) = shift;
  unless(Log::Log4perl->initialized()) {
    Log::Log4perl->init_once('/opt/httpd/logger.conf');
    $Log::Log4perl::caller_depth = 1;

    my $user_id = $ENV{USER} || $ENV{LOGNAME} || $ENV{USERNAME} || $ENV{REMOTE_
USER} || $<;
    Log::Log4perl->get_logger("esc");
    Log::Log4perl::MDC->put("user_id", $user_id);
    Log::Log4perl::MDC->put("session_id", $session_id);
  }
  return Log::Log4perl->get_logger("esc");
}

and my logger.conf is

log4perl.logger.esc=DEBUG, DBAppndr
#log4perl.rootLogger=DEBUG, DBAppndr
log4perl.appender.DBAppndr=Log::Log4perl::Appender::DBI
log4perl.appender.DBAppndr.datasource=dbi:Oracle:data
log4perl.appender.DBAppndr.username=user
log4perl.appender.DBAppndr.password=passwd
log4perl.appender.DBAppndr.sql=insert into ESC_APP_LOG (LOG_LEVEL, LOGGER_NAME, MODULE, APP_ID, CLASS, METHOD, LINE_NO, HEADING, USER_ID, MSG, LOGGER_ID) values (?,?,?,?,?,?,?,?,?,?,?)

etc

and in my cgiapp_init sub routine I call logger as below

my $logger = Logger->set_session_id($self->param('session'));
$self->param('logger'=> $logger);