db++
,
made
by
the
german
company
Concept
asa
,
is
a
relational
database
system
with
high
performance
and
low
memory
and
disk
usage
in
mind
.
While
providing
SQL
as
an
additional
language
interface
it
is
not
really
a
SQL
database
in
the
first
place
but
provides
its
own
AQL
query
language
which
is
much
more
influenced
by
the
relational
algebra
then
SQL
is
.