An OS-type is Windows, Linux, Solaris x86, Solaris SPARC, AIX, etc.
Symantec considers all versions of Windows to be of the same OS type.
Database agents "Application and Database packs" are licensed per host, or per client.
For SQL, only one Application and Database pack would be needed. If there is another
"database type" such as Oracle, another Applicatin and Database pack would be needed.