<s>
The	O
DB-Engines	B-Application
Ranking	I-Application
ranks	O
database	B-Application
management	I-Application
systems	I-Application
by	O
popularity	O
,	O
covering	O
over	O
380	O
systems	O
.	O
</s>
<s>
The	O
ranking	O
criteria	O
include	O
number	O
of	O
search	B-Application
engine	I-Application
results	O
when	O
searching	O
for	O
the	O
system	O
names	O
,	O
Google	B-Application
Trends	I-Application
,	O
Stack	B-Error_Name
Overflow	I-Error_Name
discussions	O
,	O
job	O
offers	O
with	O
mentions	O
of	O
the	O
systems	O
,	O
number	O
of	O
profiles	O
in	O
professional	O
networks	O
such	O
as	O
LinkedIn	B-Application
,	O
mentions	O
in	O
social	O
networks	O
such	O
as	O
Twitter	B-Application
.	O
</s>
<s>
By	O
grouping	O
over	O
specific	O
database	O
features	O
like	O
database	B-General_Concept
model	I-General_Concept
or	O
type	O
of	O
license	O
,	O
regularly	O
published	O
statistics	O
reveal	O
historical	O
trends	O
which	O
are	O
used	O
in	O
strategic	O
statements	O
.	O
</s>
