I would perhaps try running the first 2 queries and storing the results before running the 3rd query. As an example
#!perl
use strict;
use warnings;
use DBI;
my $localDB = _dbh();
# build list of ids
my $sql1 = << 'SQL1';
SELECT ID FROM A_TEMP2
SQL1
my $sth1 = $localDB->prepare($sql1);
$sth1->execute();
my $records = $sth1->fetchall_arrayref();
$sth1->finish;
# build list of dblinks
my $sql2 = << 'SQL2';
SELECT DBLINK FROM A_TEMP3
WHERE ID = ?
SQL2
my $sth2 = $localDB->prepare($sql2);
for (@$records){
my $id = $_->[0];
$sth2->execute($id);
while ( (my $dblink) = $sth2->fetchrow_array() ){
push @{$_->[1]},$dblink; # many links per id
}
}
$sth2->finish;
# process each id-dblink pair
for (@$records){
my $id = $_->[0];
for my $dblink (@{$_->[1]}){
my $sql3 = << "SQL3";
SELECT 1 FROM DUAL\@$dblink
SQL3
my $sth3 = $localDB->prepare($sql3);
if ($DBI::err){
print "Error with PREPARE for $dblink\n";
print $DBI::errstr."\n";
} else {
$sth3->execute();
if ($DBI::err){
print "Error with EXECUTE for $dblink\n";
print $DBI::errstr."\n";
} else {
my @f = $sth3->fetchrow_array;
print "id=$id dblink=$dblink : @f\n";
}
}
}
}
$localDB->disconnect;
sub _dbh {
my $host = "hostname";
my $sid = 'sid';
my $user = 'user';
my $pwd = 'password';
my $dsn = "dbi:Oracle:host=$host;sid=$sid";
my $dbh = DBI->connect($dsn, $user, $pwd,
{ AutoCommit => 0,
PrintError => 0,
RaiseError => 0,
TraceLevel => 0, # increase as req
}) or die "$!";
return $dbh
}
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