Please enlighten me! Why does the first DBI->Connect work and does the second DBI->Connect throw an ORA-12154? 

#!/usr/bin/perl
use strict;
use DBI;

print "DB connectivity test\n";

my $user='system';
my $password='manager';

my $DSN='dbi:Oracle://127.0.0.1:1521/db.company.local';
my $dbh = DBI->connect($DSN, $user, $password,
                      { RaiseError => 1, AutoCommit => 0 });

print "This works\n";                 
my $DSN='dbi:Oracle:host=127.0.0.1:sid=db.company.local:port=1521';
my $dbh = DBI->connect($DSN, $user, $password,
                      { RaiseError => 1, AutoCommit => 0 });
print "This doesn't\n";

[download]

Running the code yields the following result: 

DB connectivity test
This works
DBI connect('host=127.0.0.1:sid=ps.kadaster.local:port=1521','system',
+...) failed: ORA-12154: TNS:could not resolve the connect identifier 
+specified (DBD ERROR:
 OCIServerAttach) at conn_test.pl line 16.

[download]

In reply to DB Connectivity issue by schluckie

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.