<s>
In	O
database	O
computing	O
,	O
Oracle	B-Application
Real	I-Application
Application	I-Application
Testing	I-Application
(	O
RAT	O
)	O
provides	O
a	O
separately-licensed	O
environment	O
for	O
controlled	O
and	O
reproducible	O
testing	O
of	O
Oracle	B-General_Concept
database	I-General_Concept
use	O
and	O
changes	O
.	O
</s>
