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what SQL would you issue to accomplish this change?AFAIK there's two ways to change a password, either use "alter user identified by" or insert the hashed password into sys.usesr$ (in 11g you need both DES and SHA-1 hashes). You could easily guess which one I pick.
After you change it, report back what you learned.I will change it after I learn what will happen.
XS$NULL have no any objects in XE 11g R2default installation. Checked from obj$ with owner#=2147483638.
Excluded from normal export and datapump export.
Excluded from Data Guard Logical Standby activity monitoring support.
Hidden any future objects from all sys views.
XS$NULL related with XDB schema list.
Database contain some XSD under /xs/
Oracle rdbms SQLs talk about Fusion and Security.
Maybe some advanced security option from Fusion Middleware...
Oh, and I found a little mispelling in /xs/roleset.xsd:
Register XS Role SEt schema"
"Set" typed as "SEt" :)