Dear Monks,

I'm trying to call a stored procedure in an Oracle database multiple times and have them run in parallel using Parallel::ForkManager. To do so, I've created multiple database and statement handles that will be called one at a time within the parallel loop based on the loop counter value. However, I continue to receive multiple instances of the following error each time I run the program:

DBD::Oracle::db do failed: handle 2 is owned by thread 158fe8 not current thread 3c30cb8 (handles can't be shared between threads and your driver may need a CLONE method added) at test6.pl line ...

The code is below. What am I doing wrong?

Thank you for your help!

#!/usr/bin/perl
use Parallel::ForkManager;
use DBI;
use strict;

my $dbh=DBI->connect("dbi:Oracle:dbname","username","password",{RaiseE
+rror => 1 , PrintError => 0});
my $dbh1=DBI->connect("dbi:Oracle:dbname","username","password",{Raise
+Error => 1 , PrintError => 0});
my $dbh2=DBI->connect("dbi:Oracle:dbname","username","password",{Raise
+Error => 1 , PrintError => 0});
my $dbh3=DBI->connect("dbi:Oracle:dbname","username","password",{Raise
+Error => 1 , PrintError => 0});

my ($sth1, $sth2, $sth3);         # statement handles
my ($sqlstmt1, $sqlstmt2, $sqlstmt3);        # statements to be execut
+ed

my @num_array = ("1", "2", "3");
my $mid = $#num_array;

my $t = localtime();
    
my $pm = new Parallel::ForkManager($mid + 1);
for (my $mid_cnt = 0;  $mid_cnt <= $mid; $mid_cnt++) 
    {
    $pm->start and sleep 30 and next;        ## Beginning of parallel 
+process.
    
    print $x "For Number $num_array[$mid_cnt]:\n";
    
    if ($num_array[$mid_cnt] == 0) {
        $t = localtime();
        print "Calling procedure for Number $num_array[$mid_cnt] at $t
+\n";
        $sqlstmt1 = "BEGIN TEST_PROC($num_array[$mid_cnt]); end;";
        $sth1 = $dbh1->do($sqlstmt1) or die $dbh1->errstr;
        $t = localtime();
        print "Done with procedure for Number $num_array[$mid_cnt] at 
+$t\n\n";
    }
    elsif ($num_array[$mid_cnt] == 1) {
        $t = localtime();
        print "Calling procedure for Number $num_array[$mid_cnt] at $t
+\n";
        $sqlstmt2 = "BEGIN TEST_PROC($num_array[$mid_cnt]); end;";
        $sth2 = $dbh2->do($sqlstmt2) or die $dbh2->errstr;
        $t = localtime();
        print "Done with procedure for Number $num_array[$mid_cnt] at 
+$t\n\n";
    }
    else {
        $t = localtime();
        print "Calling procedure for Number $num_array[$mid_cnt] at $t
+\n";
        $sqlstmt3 = "BEGIN TEST_PROC($num_array[$mid_cnt]); end;";
        $sth3 = $dbh3->do($sqlstmt3) or die $dbh3->errstr;
        $t = localtime();
        print "Done with procedure for Number $num_array[$mid_cnt] at 
+$t\n\n";
    }
    $pm->finish;                ## End of parallel process.
}
$pm->wait_all_children;    

$dbh1 -> disconnect;
$dbh2 -> disconnect;
$dbh3 -> disconnect;
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