<s>
Percona	B-Application
Server	I-Application
for	I-Application
MySQL	I-Application
is	O
a	O
distribution	B-Application
of	O
the	O
MySQL	B-Application
relational	B-Application
database	I-Application
management	I-Application
system	I-Application
created	O
by	O
Percona	B-Language
.	O
</s>
<s>
Percona	B-Application
Server	I-Application
for	I-Application
MySQL	I-Application
is	O
an	O
open	O
source	O
relational	B-Application
database	I-Application
management	I-Application
system	I-Application
(	O
RDBMS	B-Application
)	O
.	O
</s>
<s>
It	O
is	O
a	O
free	O
,	O
fully	O
compatible	O
drop	O
in	O
replacement	O
for	O
Oracle	O
MySQL	B-Application
.	O
</s>
<s>
The	O
software	O
includes	O
a	O
number	O
of	O
scalability	O
,	O
availability	O
,	O
security	O
and	O
backup	O
features	O
only	O
available	O
in	O
MySQL	B-Application
's	O
commercial	O
Enterprise	O
edition	O
.	O
</s>
<s>
The	O
software	O
includes	O
XtraDB	B-Language
,	O
an	O
enhanced	O
distribution	B-Application
of	O
the	O
InnoDB	B-Language
Storage	I-Language
Engine	I-Language
.	O
</s>
<s>
The	O
developers	O
aim	O
to	O
retain	O
close	O
compatibility	O
to	O
the	O
official	O
MySQL	B-Application
releases	O
,	O
while	O
focusing	O
on	O
performance	O
and	O
increased	O
visibility	O
into	O
server	O
operations	O
.	O
</s>
