<s>
In	O
computing	O
,	O
the	O
User	B-Application
Programmatic	I-Application
Interface	I-Application
(	O
UPI	O
)	O
,	O
also	O
known	O
as	O
the	O
User	O
Program	O
Interface	O
,	O
consists	O
of	O
a	O
set	O
of	O
C-language	O
software	O
APIs	B-General_Concept
which	O
provide	O
the	O
lowest-level	O
API-based	O
interface	O
to	O
the	O
Oracle	B-General_Concept
database	I-General_Concept
.	O
</s>
<s>
UPI	O
offers	O
a	O
procedural	O
API	B-General_Concept
for	O
not	O
only	O
performing	O
certain	O
database	O
administration	O
tasks	O
(	O
such	O
as	O
system	O
startup	O
and	O
shutdown	O
)	O
,	O
but	O
also	O
for	O
using	O
PL/SQL	B-Language
or	O
SQL	B-Language
to	O
query	O
,	O
access	O
,	O
and	O
manipulate	O
data	O
.	O
</s>
<s>
aspect	O
of	O
the	O
Oracle	B-Application
Client	O
software	O
stack	O
.	O
</s>
<s>
Several	O
Oracle	B-General_Concept
database	I-General_Concept
applications	O
depend	O
on	O
UPI	O
,	O
including	O
:	O
</s>
