Thursday, January 26, 2012

TNS-12557: TNS:protocol adapter not loadable

TNS-12557: TNS:protocol adapter not loadable
Might occur on a Windows machine that has two or more Oracle homes installed.

Solution

Set the ORACLE_HOME environment variable using the OUI under Start > Programs > Oracle_home > Oracle Installation Products > Universal Installer.  Use the OUI to set the Environment properly on Windows.

* Refer metalink doc 556895.1 for details. 

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