<s>
MemcacheDB	B-Application
(	O
pronunciation	O
:	O
mem-cash-dee-bee	O
)	O
is	O
a	O
persistence	O
enabled	O
variant	O
of	O
memcached	B-Application
.	O
</s>
<s>
MemcacheDB	B-Application
has	O
not	O
been	O
actively	O
maintained	O
since	O
2009	O
.	O
</s>
<s>
It	O
is	O
a	O
general-purpose	O
distributed	O
memory	B-General_Concept
caching	O
system	O
often	O
used	O
to	O
speed	O
up	O
dynamic	O
database-driven	O
websites	O
by	O
caching	O
data	O
and	O
objects	O
in	O
memory	B-General_Concept
.	O
</s>
<s>
The	O
main	O
difference	O
between	O
MemcacheDB	B-Application
and	O
memcached	B-Application
is	O
that	O
MemcacheDB	B-Application
has	O
its	O
own	O
key-value	O
database	O
system	O
.	O
</s>
<s>
based	O
on	O
Berkeley	B-Language
DB	I-Language
,	O
so	O
it	O
is	O
meant	O
for	O
persistent	O
storage	O
rather	O
than	O
limited	O
to	O
a	O
non-persistent	O
cache	O
.	O
</s>
<s>
A	O
version	O
of	O
MemcacheDB	B-Application
using	O
Lightning	B-Language
Memory-Mapped	I-Language
Database	I-Language
(	O
LMDB	B-Language
)	O
is	O
also	O
available	O
,	O
offering	O
greater	O
performance	O
.	O
</s>
<s>
MemcacheDB	B-Application
is	O
accessed	O
through	O
the	O
same	O
protocol	O
as	O
memcached	B-Application
,	O
so	O
applications	O
may	O
use	O
any	O
memcached	B-Application
API	O
as	O
a	O
means	O
of	O
accessing	O
a	O
MemcacheDB	B-Application
database	O
.	O
</s>
<s>
MemcacheQ	B-Application
is	O
a	O
MemcacheDB	B-Application
variant	O
that	O
provides	O
a	O
simple	O
message	B-Operating_System
queue	I-Operating_System
service	O
.	O
</s>
<s>
Active	O
development	O
of	O
MemcacheDB	B-Application
seems	O
to	O
have	O
currently	O
stopped	O
;	O
the	O
web	O
page	O
has	O
n't	O
been	O
updated	O
since	O
2009	O
.	O
</s>
