When installing Enforce the following error is seen, “Symantec Data Loss Prevention <version> Enforce Server requires Oracle Client installed. Please install Oracle Client before continuing the installation.”
This can happen if the Enforce installation cannot find the oracle client.
Make sure the ORACLE_HOME variable is set. Next make sure the PATH variable contains the link to the bin directory under ORACLE_HOME. If this does not work then you will need to reinstall the oracle client.