HI,all,I have a problem with DBD::JDBC, it's work with 'select/insert',but failed( stalled ) for 'update/delete'

my $dsn = 'dbi:JDBC:hostname=127.0.0.1:9001;url=jdbc:oracle:thin:@192.
+168.153.100:1521:cudb;';
my $dbh = DBI->connect($dsn, undef, undef, { PrintError => 0, RaiseErr
+or => 1, jdbc_properties => \%properties }) or die "Failed to connect
+: ($DBI::err) $DBI::errstr\n";
#my $sql="select from user where status=1";  #success
#my $sql="update user set status=1";         #hang
#my $sql="insert into user(status) values(1) "; #success
my $sql="delete from user where status=1";  #hang
my $sth=$dbh->prepare($sql);
$sth->execute;
[download]

The select/insert sql exec successful.But update and insert just hang there.
Could you please help me ?
thanks