Difference between 'materialized vews' and snapshots

Hello,
i have two questions:
what the difference between 'materialized vews' and snapshots? In fact, in create thoses Oracle Objects:
     create materialized view log on T1
     Create materialized view T1_MV
          Build immediate
          Refresh fast on commit
          As Select COL1,COL2 from T1
     Create snapshot T1_SNAPSHOT
     Build immediate
     Refresh fast on commit
     As Select COL1,COL2 from T1
and in find that T1_MV and T1_SNAPSHOT have the same caracteristics in dba_tables and DBA_SNAPSHOTS and DBA_MVIEWS.
seconde question: what's the difference between DBA_SNAPSHOTS
and DBA_MVIEWS tables?
I work under oracle 9i
thinks for response.

Backwards compatibility. Some apps might reference DBA_SNAPHOTS and it would be a PITA to change them. Eventually Oracle might decide that it's a greater PITA for them to keep those views and ditch 'em.
Cheers, APC

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