Data dictionary view VS Dynamic view

Dictionary Views vs Dynamic Performance Views:

1. Dictionary Views Dynamic Performance Views
The DBA_ views usually have plural names (for
example, DBA_DATA_FILES).

The names of the V$ views are generally singular
(for example, V$DATAFILE).

2. The DBA_ views are available only when the
database is open and running.

Some V$ views are available even when the
database is not fully open and running.

3. The data contained in the DBA_ views is generally
uppercase.

The data contained in the V$ views is usually
lowercase.

4. The data contained in the DBA_ views is static
and is not cleared when the database is shut
down.

The V$ views contain dynamic statistical data
that is lost each time the database is shut
down.