Define the top-level directory for Oracle software (e.g., C:\app\client ).

MY_DB_SERVICE = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = your-database-hostname)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = your_db_service_name) ) ) Use code with caution. 2. Configuring Environment Variables

The setup utility fails to recognise modern Windows operating system versions.

"ORA-12154: TNS:could not resolve the connect identifier specified"

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The Instant Client is a "light" version that includes the essential libraries (OCI, OCCI, and JDBC) needed to run applications. No installation is required; you simply unzip the files. Microsoft Windows 32-bit Official Source: Oracle Instant Client for Windows 32-bit Package Name: instantclient-basic-nt-11.2.0.4.0.zip 2. Full Client (Requires Support Account)

This indicates that the client cannot find or parse your tnsnames.ora file.

I can then help you avoid the common “ORA-28040” / “ORA-03134” mismatches.