Question: Examine any database system that might be available to you. Try to map that system to the ANSI/SPARC architecture as described in this chapter. Does it cleanly support the three levels of the architecture? How are the mappings between levels defined? What do the various DDLs (external, conceptual, internal) look like? What data sublanguage(s) does the system support? What host languages? Who performs the DBA function? Are there any security or integrity facilities? Is there a dictionary? What vendor-provided applications does the system support? What utilities? Is there a separate DC manager? Are there any distributed processing capabilities?