<s>
A	O
deductive	B-General_Concept
database	I-General_Concept
is	O
a	O
database	B-Application
system	I-Application
that	O
can	O
make	O
deductions	O
(	O
i.e.	O
</s>
<s>
Datalog	B-Language
is	O
the	O
language	O
typically	O
used	O
to	O
specify	O
facts	O
,	O
rules	O
and	O
queries	O
in	O
deductive	B-General_Concept
databases	I-General_Concept
.	O
</s>
<s>
Deductive	B-General_Concept
databases	I-General_Concept
have	O
grown	O
out	O
of	O
the	O
desire	O
to	O
combine	O
logic	B-Language
programming	I-Language
with	O
relational	B-Application
databases	I-Application
to	O
construct	O
systems	O
that	O
support	O
a	O
powerful	O
formalism	O
and	O
are	O
still	O
fast	O
and	O
able	O
to	O
deal	O
with	O
very	O
large	O
datasets	O
.	O
</s>
<s>
Deductive	B-General_Concept
databases	I-General_Concept
are	O
more	O
expressive	B-Language
than	O
relational	B-Application
databases	I-Application
but	O
less	O
expressive	B-Language
than	O
logic	B-Language
programming	I-Language
systems	O
.	O
</s>
<s>
In	O
recent	O
years	O
,	O
deductive	B-General_Concept
databases	I-General_Concept
such	O
as	O
Datalog	B-Language
have	O
found	O
new	O
application	O
in	O
data	B-General_Concept
integration	I-General_Concept
,	O
information	B-General_Concept
extraction	I-General_Concept
,	O
networking	O
,	O
program	O
analysis	O
,	O
security	O
,	O
and	O
cloud	O
computing	O
.	O
</s>
<s>
Deductive	B-General_Concept
databases	I-General_Concept
reuse	O
many	O
concepts	O
from	O
logic	B-Language
programming	I-Language
;	O
rules	O
and	O
facts	O
specified	O
in	O
the	O
deductive	B-General_Concept
database	I-General_Concept
language	O
Datalog	B-Language
look	O
very	O
similar	O
to	O
those	O
in	O
Prolog	B-Language
.	O
</s>
<s>
However	O
important	O
differences	O
between	O
deductive	B-General_Concept
databases	I-General_Concept
and	O
logic	B-Language
programming	I-Language
:	O
</s>
<s>
Order	O
sensitivity	O
and	O
procedurality	O
:	O
In	O
Prolog	B-Language
,	O
program	O
execution	O
depends	O
on	O
the	O
order	O
of	O
rules	O
in	O
the	O
program	O
and	O
on	O
the	O
order	O
of	O
parts	O
of	O
rules	O
;	O
these	O
properties	O
are	O
used	O
by	O
programmers	O
to	O
build	O
efficient	O
programs	O
.	O
</s>
<s>
In	O
database	O
languages	O
(	O
like	O
SQL	O
or	O
Datalog	B-Language
)	O
,	O
however	O
,	O
program	O
execution	O
is	O
independent	O
of	O
the	O
order	O
of	O
rules	O
and	O
facts	O
.	O
</s>
<s>
Special	O
predicates	O
:	O
In	O
Prolog	B-Language
,	O
programmers	O
can	O
directly	O
influence	O
the	O
procedural	O
evaluation	O
of	O
the	O
program	O
with	O
special	O
predicates	O
such	O
as	O
the	O
cut	B-Application
,	O
this	O
has	O
no	O
correspondence	O
in	O
deductive	B-General_Concept
databases	I-General_Concept
.	O
</s>
<s>
Function	O
symbols	O
:	O
Logic	B-Language
Programming	I-Language
languages	I-Language
allow	O
function	O
symbols	O
to	O
build	O
up	O
complex	O
symbols	O
.	O
</s>
<s>
This	O
is	O
not	O
allowed	O
in	O
deductive	B-General_Concept
databases	I-General_Concept
.	O
</s>
<s>
Tuple-oriented	O
processing	O
:	O
Deductive	B-General_Concept
databases	I-General_Concept
use	O
set-oriented	O
processing	O
while	O
logic	B-Language
programming	I-Language
languages	I-Language
concentrate	O
on	O
one	O
tuple	B-Application
at	O
a	O
time	O
.	O
</s>
