<s>
Drizzle	B-Application
is	O
a	O
discontinued	O
free	O
software/open	O
-source	O
relational	O
database	B-Application
management	I-Application
system	I-Application
(	O
DBMS	O
)	O
that	O
was	O
forked	B-Application
from	O
the	O
now-defunct	O
6.0	O
development	O
branch	O
of	O
the	O
MySQL	B-Application
DBMS	O
.	O
</s>
<s>
Like	O
MySQL	B-Application
,	O
Drizzle	B-Application
had	O
a	O
client/server	B-Operating_System
architecture	I-Operating_System
and	O
uses	O
SQL	B-Language
as	O
its	O
primary	O
command	B-Language
language	I-Language
.	O
</s>
<s>
Old	O
Drizzle	B-Application
files	O
are	O
distributed	O
under	O
version	O
2	O
and	O
3	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
with	O
portions	O
,	O
including	O
the	O
protocol	O
drivers	O
and	O
replication	B-Architecture
messaging	O
under	O
the	O
BSD	B-Operating_System
license	I-Operating_System
.	O
</s>
<s>
Early	O
work	O
on	O
the	O
fork	B-Application
was	O
done	O
mid-2008	O
by	O
Brian	O
Aker	O
.	O
</s>
<s>
Ongoing	O
development	O
was	O
handled	O
by	O
a	O
team	O
of	O
contributors	O
that	O
included	O
staff	O
members	O
from	O
Canonical	O
Ltd.	O
,	O
Google	B-Application
,	O
Six	B-Protocol
Apart	I-Protocol
,	O
Sun	O
Microsystems	O
,	O
Rackspace	O
,	O
Data	O
Differential	O
,	O
Blue	O
Gecko	O
,	O
Intel	O
,	O
Percona	B-Language
,	O
Hewlett-Packard	O
,	O
Red	O
Hat	O
,	O
and	O
others	O
.	O
</s>
<s>
Drizzle	B-Application
source	O
code	O
,	O
along	O
with	O
instructions	O
on	O
compiling	O
it	O
,	O
are	O
available	O
via	O
the	O
project	O
's	O
Launchpad	B-Protocol
website	O
.	O
</s>
<s>
In	O
October	O
2010	O
,	O
Drizzle	B-Application
had	O
13,478	O
total	O
contributions	O
,	O
96	O
total	O
contributors	O
,	O
and	O
37	O
active	O
contributors	O
.	O
</s>
<s>
It	O
was	O
also	O
announced	O
that	O
Drizzle	B-Application
had	O
entered	O
Beta	O
,	O
.	O
</s>
<s>
Drizzle	B-Application
has	O
actively	O
participated	O
in	O
the	B-Application
Google	I-Application
Summer	B-Application
of	I-Application
Code	I-Application
Project	O
since	O
2010	O
.	O
</s>
<s>
In	O
July	O
2016	O
the	O
maintainers	O
concluded	O
that	O
the	O
time	O
had	O
come	O
for	O
"	O
winding	O
things	O
up	O
officially	O
"	O
because	O
"	O
none	O
of	O
us	O
have	O
any	O
time	O
to	O
dedicate	O
to	O
Drizzle	B-Application
anymore	O
"	O
.	O
</s>
<s>
Drizzle	B-Application
is	O
targeted	O
at	O
the	O
web-infrastructure	O
and	O
cloud	B-Architecture
computing	I-Architecture
markets	O
.	O
</s>
<s>
The	O
developers	O
of	O
the	O
product	O
describe	O
it	O
as	O
a	O
"	O
smaller	O
,	O
slimmer	O
and	O
(	O
hopefully	O
)	O
faster	O
version	O
of	O
MySQL	B-Application
"	O
.	O
</s>
<s>
Drizzle	B-Application
is	O
written	O
in	O
the	O
C++	B-Language
programming	I-Language
language	I-Language
,	O
and	O
stores	O
its	O
string	O
data	O
in	O
the	O
UTF-8	O
format	O
.	O
</s>
<s>
It	O
is	O
being	O
developed	O
for	O
modern	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
including	O
Linux	B-Application
,	O
FreeBSD	B-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
and	O
Solaris	B-Application
–	O
in	O
general	O
,	O
any	O
OS	O
that	O
conforms	O
to	O
POSIX	O
and	O
has	O
a	O
working	O
implementation	O
of	O
the	O
GNU	B-Application
Autotools	I-Application
.	O
</s>
<s>
Microsoft	B-Application
Windows	I-Application
is	O
not	O
supported	O
at	O
this	O
time	O
,	O
mainly	O
for	O
lack	O
of	O
Autotools	B-Application
support	O
,	O
but	O
there	O
has	O
been	O
discussion	O
of	O
how	O
to	O
accomplish	O
this	O
in	O
a	O
sensible	O
manner	O
.	O
</s>
<s>
Drizzle	B-Application
is	O
a	O
re-designed	O
version	O
of	O
the	O
MySQL	B-Application
v6.0	O
codebase	O
and	O
is	O
designed	O
around	O
a	O
central	O
concept	O
of	O
having	O
a	O
microkernel	B-Operating_System
architecture	O
.	O
</s>
<s>
Features	O
such	O
as	O
the	O
query	O
cache	B-General_Concept
and	O
authentication	O
system	O
are	O
now	O
plugins	B-Application
to	O
the	O
database	O
,	O
which	O
follow	O
the	O
general	O
theme	O
of	O
"	O
pluggable	O
storage	B-General_Concept
engines	I-General_Concept
"	O
that	O
were	O
introduced	O
in	O
MySQL	B-Application
5.1	I-Application
.	O
</s>
<s>
It	O
supports	O
PAM	B-Application
,	O
LDAP	B-Protocol
,	O
and	O
HTTP	B-Protocol
AUTH	I-Protocol
for	O
authentication	O
via	O
plugins	B-Application
it	O
ships	O
.	O
</s>
<s>
Via	O
its	O
plugin	B-Application
system	O
it	O
currently	O
supports	O
logging	O
to	O
files	O
,	O
syslog	B-Protocol
,	O
and	O
remote	O
services	O
such	O
as	O
RabbitMQ	B-Application
and	O
Gearman	B-Application
.	O
</s>
<s>
Drizzle	B-Application
is	O
an	O
ACID-compliant	O
relational	O
database	O
that	O
supports	O
transactions	O
via	O
an	O
MVCC	B-Operating_System
design	O
.	O
</s>
<s>
Plugin	B-Application
points	O
have	O
been	O
added	O
to	O
support	O
replication	B-Architecture
,	O
storage	B-General_Concept
engines	I-General_Concept
,	O
query	O
rewrite	O
,	O
table	O
functions	O
,	O
user-defined	B-Language
functions	I-Language
,	O
protocol	O
adapters	O
,	O
and	O
multiple	O
query	O
caches	B-General_Concept
.	O
</s>
<s>
Like	O
MySQL	B-Application
,	O
Drizzle	B-Application
supports	O
concurrent	O
multiple	O
engines	O
.	O
</s>
<s>
Via	O
this	O
,	O
Drizzle	B-Application
includes	O
built-in	O
support	O
for	O
B+	O
tree	O
and	O
hash	B-Algorithm
indexes	O
.	O
</s>
<s>
Drizzle	B-Application
's	O
query	O
planner	O
is	O
capable	O
of	O
using	O
multiple	O
indexes	O
,	O
from	O
multiple	O
engines	O
to	O
satisfy	O
complex	O
queries	O
,	O
using	O
temporary	O
in-memory	O
bitmap	B-Data_Structure
index	I-Data_Structure
operations	O
.	O
</s>
<s>
Database	B-Language
triggers	I-Language
in	O
Drizzle	B-Application
are	O
supported	O
for	O
DML	B-Language
,	O
DDL	B-Language
,	O
and	O
a	O
number	O
of	O
additional	O
event-based	O
operations	O
in	O
the	O
server	O
.	O
</s>
<s>
The	O
PrimeBase	O
BLOB	B-General_Concept
streaming	O
system	O
,	O
which	O
allows	O
Drizzle	B-Application
to	O
stream	O
binary	B-General_Concept
large	I-General_Concept
objects	I-General_Concept
(	O
BLOBs	B-General_Concept
)	O
via	O
HTTP	O
,	O
makes	O
use	O
of	O
this	O
system	O
.	O
</s>
<s>
All	O
triggers	O
for	O
Drizzle	B-Application
currently	O
must	O
be	O
written	O
in	O
C++	B-Language
.	O
</s>
<s>
This	O
action	O
is	O
done	O
before	O
parsing	B-Language
occurs	O
.	O
</s>
<s>
Through	O
support	O
of	O
the	O
EXECUTE	O
command	O
Drizzle	B-Application
can	O
operate	O
dynamic	O
multi-statement	O
SQL	B-Language
.	O
</s>
<s>
Via	O
the	B-Application
keyword	I-Application
CONCURRENT	O
it	O
can	O
operate	O
these	O
statements	O
in	O
parallel	B-Operating_System
.	O
</s>
<s>
Replication	B-Architecture
in	O
Drizzle	B-Application
is	O
done	O
by	O
generating	O
"	O
messages	O
"	O
using	O
the	B-Application
Google	I-Application
Protocol	B-Protocol
Buffers	I-Protocol
library	O
.	O
</s>
<s>
The	O
message	O
format	O
is	O
a	O
non-SQL	O
neutral	O
format	O
which	O
has	O
allowed	O
Drizzle	B-Application
to	O
have	O
replication	B-Architecture
appliers	O
to	O
RabbitMQ	B-Application
,	O
Memcached	B-Application
,	O
MySQL	B-Application
,	O
Voldemort	B-Application
,	O
and	O
Apache	B-Application
Cassandra	I-Application
.	O
</s>
<s>
Drizzle	B-Application
is	O
licensed	O
under	O
version	O
two	O
and	O
three	O
of	O
the	O
GPL	B-License
,	O
with	O
some	O
parts	O
,	O
such	O
as	O
libdrizzle	O
client	O
library	O
,	O
under	O
the	O
BSD	B-Operating_System
license	I-Operating_System
.	O
</s>
