default to disconnect_when_inactive(0). So RunnableDB's must now

turn disconnect ON, when there will be lots of them and they have
moments when there will be little DB activity.  The new disconnect system
disconnects so much, that it's slower than before, so must use sparingly.

modules/Bio/EnsEMBL/Hive/RunnableDB/Dummy.pm

@@ -64,15 +64,13 @@ our @ISA = qw(Bio::EnsEMBL::Pipeline::RunnableDB);
 
 sub fetch_input {
   my $self = shift;
-  $self->db->dbc->disconnect_when_inactive(0);
   return 1;
 }
 
 sub run
 {
   my $self = shift;
-  #call superclasses run method
-  return $self->SUPER::run();
+  return 1;
 }
 
 sub write_output {

modules/Bio/EnsEMBL/Hive/URLFactory.pm

@@ -194,7 +194,7 @@ sub _get_db_connection
   $module = "Bio::EnsEMBL::Pipeline::DBSQL::DBAdaptor" if($type eq 'pipeline');
    
   $dba = "$module"->new (
-          -disconnect_when_inactive => 1,
+          -disconnect_when_inactive => 0,
           -driver => 'mysql',
           -user   => $user,
           -pass   => $pass,

modules/Bio/EnsEMBL/Hive/Worker.pm

@@ -283,7 +283,7 @@ sub run
   }
   $self->print_worker();
 
-  $self->db->dbc->disconnect_when_inactive(1);
+  $self->db->dbc->disconnect_when_inactive(0);
 
   my $jobDBA = $self->db->get_AnalysisJobAdaptor;
   my $alive=1;