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Under RedHat 6.2 + oracle enterprise edition 18.104.22.168.1 + PHP4.0.1pl2 and Apache 1.3.12, I can't open a session with OCILogon with the SID name. The listener say me that don't know the SID name. The trouble does not exist if I open a session under the UNIX's account directly with sqlplus (for example). If I pass the descriptor of the Service Name instead of SID Name, the openning of the session with OCILogon is okay.
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Have you defined all the oracle specific environment variables before
starting Apache? Look for list at http://www.php.net/manual/ref.oci8.php