<s>
Polyglot	B-General_Concept
persistence	I-General_Concept
is	O
a	O
term	O
that	O
refers	O
to	O
using	O
multiple	O
data	O
storage	O
technologies	O
within	O
a	O
single	O
system	O
,	O
in	O
order	O
to	O
meet	O
varying	O
data	O
storage	O
needs	O
.	O
</s>
<s>
Polyglot	B-General_Concept
persistence	I-General_Concept
shares	O
its	O
origins	O
with	O
how	O
the	O
term	O
Polyglot	O
programming	O
is	O
defined	O
.	O
</s>
<s>
This	O
same	O
concept	O
can	O
be	O
applied	O
to	O
databases	O
,	O
that	O
an	O
application	O
can	O
communicate	O
with	O
different	O
databases	O
,	O
using	O
each	O
for	O
what	O
it	O
is	O
best	O
at	O
to	O
achieve	O
an	O
end	O
goal	O
,	O
hence	O
the	O
term	O
polyglot	B-General_Concept
persistence	I-General_Concept
.	O
</s>
<s>
Relational	B-Application
databases	I-Application
,	O
for	O
example	O
,	O
are	O
good	O
at	O
enforcing	O
relationships	O
that	O
exist	O
between	O
various	O
data	O
tables	O
.	O
</s>
<s>
To	O
discover	O
a	O
relationship	O
or	O
to	O
find	O
data	O
from	O
different	O
tables	O
that	O
belong	O
to	O
the	O
same	O
object	O
,	O
an	O
SQL	B-Language
join	I-Language
operation	O
can	O
be	O
used	O
.	O
</s>
<s>
A	O
graph	B-Application
database	I-Application
might	O
solve	O
the	O
problem	O
of	O
relationships	O
in	O
case	O
of	O
Big	B-Application
Data	I-Application
,	O
but	O
it	O
might	O
not	O
solve	O
the	O
problem	O
of	O
database	B-General_Concept
transactions	I-General_Concept
,	O
which	O
may	O
be	O
provided	O
better	O
by	O
relational	B-Application
database	I-Application
management	I-Application
systems	I-Application
.	O
</s>
<s>
Instead	O
,	O
a	O
NoSQL	B-General_Concept
document	B-General_Concept
database	I-General_Concept
might	O
be	O
used	O
to	O
store	O
unstructured	O
data	O
for	O
that	O
particular	O
part	O
of	O
the	O
problem	O
.	O
</s>
<s>
Martin	O
Fowler	O
writes	O
in	O
one	O
of	O
his	O
articles	O
,	O
"	O
One	O
of	O
the	O
interesting	O
consequences	O
of	O
this	O
is	O
that	O
we	O
are	O
gearing	O
up	O
for	O
a	O
shift	O
to	O
polyglot	B-General_Concept
persistence	I-General_Concept
where	O
any	O
decent	O
sized	O
enterprise	O
will	O
have	O
a	O
variety	O
of	O
different	O
data	O
storage	O
technologies	O
for	O
different	O
kinds	O
of	O
data	O
.	O
</s>
<s>
There	O
will	O
still	O
be	O
large	O
amounts	O
of	O
it	O
managed	O
in	O
relational	B-Application
stores	O
,	O
but	O
increasingly	O
we	O
'll	O
be	O
first	O
asking	O
how	O
we	O
want	O
to	O
manipulate	O
the	O
data	O
and	O
only	O
then	O
figuring	O
out	O
what	O
technology	O
is	O
the	O
best	O
bet	O
for	O
it.	O
"	O
</s>
