PHP and remote Oracle DB

Does anyone know what is needed to connect PHP to a remote Oracle 10g DB? I have followed the steps at http://www.oracle.com/technology/pub/notes/technote_php_instant.html but and a little confused because I am not the Oracle guy.
They speak of Oracle 10g's Easy Connect syntax and use a PHP variable $c = OCILogon('hr', 'hr_password', '//mymachine.mydomain/MYDB');. Now is there something on the Oracle DB side that allows this connection syntax? Is there anything on the DB side that I have to enable to allow this remote connection?
I've used MySQL and PHP but having no knowledge of Oracle makes it hard for trial and error.
I cant seem to find a simple answer (or it may be I dont understand it) on what is needed for a remote DB connection without them going into other avenues that involving tnsnames.ora or Oracle client environment variables.
I have PHP 5, Apache 2, and the Instant client on a Windows 2000 Pro machine, and a remote Red Hat AS 4 Oracle 10g Database.
Any help to lead me on the right path will be appreciated.

You probably don't have to do anything at the DB end.
Grab 10g instant client for your platform and build php with oci8 support.
In your php script you will only have to enter the "Easy Connect URL" for the database.
Let's say your oracle DB is running on a machine called alpha.com and the SID of the DB is FOO and the listener port is 1521. Then the easy connect URL is
//alpha.com:1521/FOO
You must already know the service name/SID of your DB.
The "Easy Connect" naming automatically changes the "easy connect url" to the correct TNSNAMES format.
(TNSNAME is the standard way of telling the OCI client the complete location details of the DB).

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These pros/cons are UNIX/Linux-oriented since I assume most Windows environments do not have added 3rd-party products that provide secure shell so SAP gateway is the only method.
Secure shell
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+ Secure shell service probably automatically starts upon boot of the remote system operating system.
+ Secure shell is a widely used tool outside of SAP for executing commands remotely without passwords.
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- Requires setting up secure shell key-based authentication, which should be known by UNIX/Linux admins or combined Basis/UNIX/Linux admins, but might be less familiar to SAP Web AS only admins.
- If your admin config policy is to have SAP interact as little possible with the OS level for interfaces with other systems, here you are relying on the OS-level secure shell.
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- Shell environment of remote user that runs the gateway looks like something setup by the SAP installer but is not standard because it has a few additional environment variables added.
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Hi Joe,
I configured a monitoring/dba landscape for two SAP Portals and one SAP BusinessObjects system on a SAP landscape by using DBACOCKPIT, at a customer site. These systems are running on AIX, Windows 2003/2008 servers and attached to the central monitoring system with standalone SAP gateway installations.
One another reason to not use OS based commands or 3rd party tools is security. We are stopping and disabling most of the services on OS where SAP system is running on, because of the security reasons. I faced more security gaps on rsh/ssh and the other tools than standalone SAP Gateway installations. As you can figure out that rsh/ssh is getting more attack than standalone SAP Gateway, because of well known by the IT world.
As a summary of it, this depends to point of view and policy of the IT organization. I applied both ssh and standalone SAP Gateway solutions at my customers, but I choose standalone SAP Gateway installation among of them.
Best regards,
Orkun Gedik

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The oci_* names were introduced in PHP 5. In PHP 4 the equivalent connection command is ocilogon(). For other mappings see Appendix C of the free book http://www.oracle.com/technetwork/topics/php/underground-php-oracle-manual-098250.html
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