<s>
Distributed	B-Architecture
Relational	O
Database	O
Architecture	O
(	O
DRDA	B-Language
)	O
is	O
a	O
database	O
interoperability	O
standard	O
from	O
The	B-Application
Open	I-Application
Group	I-Application
.	O
</s>
<s>
DRDA	B-Language
describes	O
the	O
architecture	O
for	O
distributed	B-Architecture
relational	O
databases	O
.	O
</s>
<s>
It	O
defines	O
the	O
rules	O
for	O
accessing	O
the	O
distributed	B-Architecture
data	O
,	O
but	O
it	O
does	O
not	O
provide	O
the	O
actual	O
application	B-Application
programming	I-Application
interfaces	I-Application
(	O
APIs	B-Application
)	O
to	O
perform	O
the	O
access	B-General_Concept
.	O
</s>
<s>
It	O
was	O
first	O
used	O
in	O
DB2	B-Application
2.3	O
.	O
</s>
<s>
DRDA	B-Language
was	O
designed	O
by	O
a	O
work	O
group	O
within	O
IBM	O
in	O
the	O
period	O
1988	O
to	O
1994	O
.	O
</s>
<s>
The	O
messages	O
,	O
protocols	O
,	O
and	O
structural	O
components	O
of	O
DRDA	B-Language
are	O
defined	O
by	O
the	O
Distributed	B-Operating_System
Data	I-Operating_System
Management	I-Operating_System
Architecture	I-Operating_System
.	O
</s>
<s>
The	O
AR	O
accepts	O
SQL	B-Language
requests	O
from	O
an	O
application	O
and	O
sends	O
them	O
to	O
the	O
appropriate	O
application	O
servers	O
for	O
processing	O
.	O
</s>
<s>
Using	O
this	O
function	O
,	O
application	O
programs	O
can	O
access	B-General_Concept
remote	O
data	O
.	O
</s>
<s>
The	O
AR	O
and	O
the	O
AS	O
communicate	O
through	O
a	O
protocol	O
called	O
the	O
Application	O
Support	O
Protocol	O
which	O
handles	O
data	B-General_Concept
representation	I-General_Concept
conversion	I-General_Concept
.	O
</s>
<s>
The	O
DS	O
supports	O
distributed	B-Architecture
requests	O
and	O
will	O
forward	O
parts	O
of	O
the	O
request	O
to	O
collaborating	O
DS	O
in	O
order	O
to	O
fulfill	O
the	O
request	O
.	O
</s>
<s>
Oracle	O
Database	O
Provider	O
for	O
DRDA	B-Language
-	O
enables	O
Oracle	O
database	O
to	O
act	O
as	O
a	O
DRDA	B-Language
server	O
,	O
providing	O
Oracle	O
database	O
access	B-General_Concept
to	O
remote	O
clients	O
(	O
e.g.	O
</s>
