Oracle Software Owner, LDAP user or local user ?
In all of our current stand alone Oracle Client installations as well as full Oracle EE installations a local account exists on the dbms host (and groups dba, oper, etc. etc.) We have many installations but we are about to re-platform over the next year or so.
Reviewing the Client installation documentation : http://docs.oracle.com/cd/E11882_01/install.112/e24325.pdf
the following is documented: (pg 13)
5 Creating Required Operating System Groups and Users
The following local operating system groups and users are required if you are
installing Oracle Database:
■ The Oracle Inventory group (typically, oinstall)
■ The Oracle software owner (typically, oracle)