Enterprise Single Sign-On (E-SSO) helps end users log on to multiple systems or applications without the need to remember every password or logon dialog. Once a user has successfully authenticated to the Enterprise Single Sign-On application, further logon to applications running under the system’s control are carried out automatically.
For more detailed, please check
User Guide SAP NetWeaver Single Sign-On: Enterprise Single Sign-On:
For Unix logon, I recommend you use SSH with Kerberos. You don't need to buy an SSO product for this, since Kerberos enabled SSH is included with Unix and Linux distributions, and you can use free Putty on Windows workstations.
For Oracle DB access over SQL, you can use the Kerberos supported provided by Oracle. Again, no need to buy anything for this.
Generally e-sso products are used when an application (e.g. legacy) cannot be changed to use cryptography for authentication, and where security is not a big requirements/concern. An e-sso product usually remembers the users password and inserts it into the logon screen of the application, which means it is not improving security like cryptography based authentication would, but the end user doesn't have to remember their passwords.
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