I'm creating a simple little thing to compare tables and rowcounts in a particular schema between two oracle databases.

Currently, I've got the hashes created using references and can look at the data, but I need to compare the hashes against each other. I wanted to do this in a new subroutine, but I'm confused on how to return the data so it can be used in another sub. 
#!/usr/local/bin/perl -w

use strict;
use DBI;
use Env;

my @DB = ('ORACLE1','ORACLE2');
my $user = "user";
my $passwd = "passwd";
my $schema = "FOOBAR";

&query_databases();

sub query_databases {
  for (@DB)  {
    my %dbs;
    my ($dbh,$sth,@TABLE_NAMES,$TABLE_NAME,$rowcount,%result);
    my $db = $_;
    my $DBHome = "/U01/oracle/ora817";
    $ENV{"ORACLE_HOME"} = $DBHome;

# Login to the database
    $dbh = DBI->connect("dbi:Oracle:$db",$user,$passwd,{AutoCommit => 
+0, RaiseError
=> 1}) || die("Oracle login FAILED, $DBI::errstr");

    $sth = $dbh->prepare("select TABLE_NAME from dba_tables where owne
+r=?");
    $sth->execute( $schema );

    while ( $TABLE_NAME = $sth->fetchrow_array ) {
      push(@TABLE_NAMES,$TABLE_NAME);
    }
    die $sth->errstr if $sth->err;
    for $TABLE_NAME ( @TABLE_NAMES ) {
       $sth = $dbh->prepare("select count(*) from $schema.$TABLE_NAME"
+);
       $sth->execute;

       while ($rowcount = $sth->fetchrow_array ) {
          $dbs{$db}->{$TABLE_NAME} = $rowcount;
       }
    }

#     for my $key1 (@DB) {
#       print "Database is $key1\n";
#       for my $key2 ( sort keys %{$dbs{$key1}} ) {
#          print "TABLE = $key2\trows = $dbs{$key1}->{$key2}\n";
#       }
#     }
    $dbh->disconnect;
  }
}

sub do_compare {
# ????????
}

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I'm sure I've used inferior variable declaration and scope. Please be as harsh as needed.

In reply to References and passing data to a different sub. by bcole23

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