<s>
Postgres-XL	B-Language
is	O
a	O
distributed	B-Operating_System
relational	B-Application
database	I-Application
management	I-Application
system	I-Application
(	O
RDBMS	O
)	O
software	O
based	O
on	O
PostgreSQL	B-Application
.	O
</s>
<s>
It	O
aims	O
to	O
provide	O
feature	O
parity	O
with	O
PostgreSQL	B-Application
while	O
distributing	O
the	O
workload	O
over	O
a	O
cluster	B-Architecture
.	O
</s>
<s>
The	O
name	O
"	O
Postgres-XL	B-Language
"	O
stands	O
for	O
"	O
eXtensible	O
Lattice	O
"	O
.	O
</s>
<s>
Postgres-XL	B-Language
is	O
based	O
on	O
Postgres-XC	O
,	O
an	O
earlier	O
distributed	B-Operating_System
PostgreSQL	B-Application
system	O
developed	O
by	O
NTT	O
Data	O
and	O
EnterpriseDB	B-Language
.	O
</s>
<s>
In	O
2012	O
,	O
the	O
cloud	O
database	O
startup	O
StormDB	B-Language
adopted	O
Postgres-XC	O
and	O
developed	O
some	O
proprietary	O
extensions	O
and	O
improvements	O
to	O
it	O
.	O
</s>
<s>
In	O
2013	O
,	O
StormDB	B-Language
was	O
acquired	O
by	O
TransLattice	O
,	O
and	O
the	O
improved	O
software	O
was	O
open-sourced	O
under	O
the	O
name	O
"	O
Postgres-XL	B-Language
"	O
in	O
2014	O
.	O
</s>
<s>
Since	O
2015	O
,	O
Postgres-XL	B-Language
development	O
has	O
also	O
been	O
supported	O
by	O
2ndQuadrant	O
.	O
</s>
<s>
Postgres-XL	B-Language
provides	O
cluster-wide	O
consistent	O
transaction	B-Operating_System
snapshots	I-Operating_System
via	O
a	O
central	O
Global	O
Transaction	O
Manager	O
(	O
GTM	O
)	O
node	O
.	O
</s>
<s>
It	O
requires	O
a	O
fast	O
interconnect	O
between	O
nodes	O
,	O
so	O
Postgres-XL	B-Language
is	O
not	O
suited	O
to	O
geographically	O
distributed	B-Architecture
clusters	I-Architecture
.	O
</s>
<s>
Individual	O
database	B-Application
tables	I-Application
can	O
be	O
chosen	O
to	O
be	O
fully	O
replicated	B-Architecture
across	O
the	O
cluster	B-Architecture
(	O
usually	O
for	O
smaller	O
tables	O
)	O
or	O
sharded	B-General_Concept
between	O
separate	O
nodes	O
(	O
for	O
write	O
scalability	O
)	O
.	O
</s>
