Salvage data from database with data dictionary corruptions

Hi,

A database has experienced some damages - finally we have a running instance (with things like _allow_resetlogs_corruption=true).

1. We can only connect to the database as sys (works through network too). Connection as ordinary user doesn't work (results in ORA-01033)
2. Export doesn't work (since some data dictionary objects are not available)
3. Creating new objects, granting some privileges - doesn't work either
4. We can select data from some of the application tables (i.e. they have not been completely damaged)
5. We can't use some of the data dictionary views (e.g. dba_data_files, dba_segments fail). Others seem to work - e.g. dba_tables, dba_objects.