<s>
The	O
reverse	B-Application
star	I-Application
schema	I-Application
is	O
a	O
schema	B-Application
optimized	O
for	O
fast	O
retrieval	B-Application
of	O
large	O
quantities	O
of	O
descriptive	O
data	O
.	O
</s>
<s>
The	O
design	O
was	O
derived	O
from	O
a	O
warehouse	O
star	B-Application
schema	I-Application
,	O
and	O
its	O
adaptation	O
for	O
descriptive	O
data	O
required	O
that	O
certain	O
key	O
characteristics	O
of	O
the	O
classic	O
star	B-Application
schema	I-Application
be	O
"	O
reversed	O
"	O
.	O
</s>
<s>
The	O
relation	O
of	O
the	O
central	O
table	O
to	O
those	O
in	O
dimension	O
tables	O
is	O
one-to-many	O
,	O
or	O
in	O
some	O
cases	O
many-to-many	O
rather	O
than	O
many-to-one	O
;	O
the	O
primary	O
keys	O
of	O
the	O
central	O
table	O
are	O
the	O
foreign	B-Application
keys	I-Application
in	O
dimension	O
tables	O
,	O
and	O
the	O
main	O
tables	O
are	O
,	O
in	O
general	O
,	O
smaller	O
than	O
the	O
dimension	O
tables	O
.	O
</s>
<s>
Main	O
table	O
columns	O
are	O
typically	O
the	O
source	O
of	O
query	B-Language
constraints	O
,	O
as	O
opposed	O
to	O
dimension	O
tables	O
in	O
the	O
classical	O
star	B-Application
schema	I-Application
.	O
</s>
<s>
By	O
starting	O
queries	B-Language
with	O
the	O
smaller	O
table	O
,	O
many	O
results	O
are	O
filtered	O
out	O
early	O
in	O
the	O
querying	O
process	O
,	O
thereby	O
streamlining	O
the	O
entire	O
search	B-Application
path	I-Application
.	O
</s>
<s>
To	O
provide	O
further	O
query	B-Language
optimization	I-Language
,	O
a	O
data	O
set	O
can	O
be	O
partitioned	O
into	O
separate	O
physical	O
schemas	O
on	O
either	O
the	O
same	O
database	B-Application
server	I-Application
or	O
different	O
database	B-Application
servers	I-Application
.	O
</s>
