RE: PERL DBI connection to Remote Oracle Database

From: Reidy, Ron <Ron.Reidy_at_arraybiopharma.com>
Date: Tue, 28 Aug 2007 11:48:19 -0600
Message-ID: <7209E76DACFED9469D4F5169F9880C7A675CE3@mail01bldr.arraybp.com>

DBI and DBD::Oracle are nothing more than Pro*C programs (libraries. actually). They do nothing magic during the connection - it's just like making a connection in SQL*Plus.

So, do you have a tnsnames.ora file, or are you using OID for TNS resolution?

Ron Reidy
Lead DBA

From: Sanjay Mishra [mailto:smishra_97_at_yahoo.com] Sent: Tuesday, August 28, 2007 11:33 AM
To: Reidy, Ron; oracle-l_at_freelists.org
Subject: RE: PERL DBI connection to Remote Oracle Database

Ron

It is working and I am trying to understand as how it is making connection even the Port is not defined. On Remote DB server, I am running two listener. How this program use SID defined in Perl to connect to correct instance.

"Reidy, Ron" <Ron.Reidy_at_arraybiopharma.com> wrote:

My guess is it won't make a connection except for the default ports. What happens if you try it yourself with a small program?

	Ron Reidy
	Lead DBA
	 



________________________________


	From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Sanjay Mishra
	Sent: Tuesday, August 28, 2007 8:42 AM
	To: oracle-l_at_freelists.org
	Subject: PERL DBI connection to Remote Oracle Database
	
	
	Hi
	 
	I am working on exsiting Perl program and found that it is usinf

DBI to connect to Remote Database . The string used to connect the Remote database doesn't have PORT. Connection is going fine. Remote database is listening on PORT 1523 and not the Default 1521.

I checked the Manual and it says the following but still not clear as if it only check on 1521 and 1526 or others. Any ideas as how it will work if Port is not specified like even shown below in the Doc statement

Connecting without environment variables or tnsname.ora file

	If you use the host=$host;sid=$sid style syntax, for example: 
	  $dbh = DBI->connect("dbi:Oracle:host=myhost.com;sid=ORCL",
$user, $passwd);
	then DBD::Oracle will construct a full connection descriptor

string for you and Oracle will not need to consult the tnsname.ora file.

If a port number is not specified then the descriptor will try both 1526 and 1521 in that order (e.g., new then old). You can check which port(s) are in use by typing "$ORACLE_HOME/bin/lsnrctl stat" on the server.

Sanjay

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Received on Tue Aug 28 2007 - 12:48:19 CDT