You're doing better than you think. There are a few errors that interfere with what you want.

• In query_databases(), %dbs is declared my inside the loop over databases. The ORACLE2 pass will destroy the ORACLE1 data. Solution: move my %dbs; outside the for (@DB) {} loop, and plan on an extra top level of keys in the hash labeling which db the data is from.
• Your sub does not return a useful value, so all the lexical data you've collected is being lost on exit. Return a reference to the %dbs hash by adding the last line to the sub: return \%dbs;
• When you call query_databases(), you should assign the result to a variable. That can then be passed to the do_compare() sub.

I'm not clear on exactly what you want to compare, but all the data collected in the queries is available in the return from query_databases(). Your sub will start out:

sub do_compare {
    my $dbs = shift;
    my $the_results;
#   compare stuff and set $the_results
    return $the_results;
}
[download]

I haven't examined your database queries, assuming they do what you want.

After Compline,
Zaxo

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