<s>
OrientDB	B-Operating_System
is	O
an	O
open	O
source	O
NoSQL	B-General_Concept
database	B-Application
management	I-Application
system	I-Application
written	O
in	O
Java	B-Language
.	O
</s>
<s>
It	O
is	O
a	O
Multi-model	B-Operating_System
database	I-Operating_System
,	O
supporting	O
graph	B-Application
,	O
document	B-General_Concept
,	O
key/value	B-Data_Structure
,	O
and	O
object	B-Application
models	O
,	O
but	O
the	O
relationships	O
are	O
managed	O
as	O
in	O
graph	B-Application
databases	I-Application
with	O
direct	O
connections	O
between	O
records	O
.	O
</s>
<s>
It	O
has	O
a	O
strong	O
security	O
profiling	O
system	O
based	O
on	O
users	O
and	O
roles	O
and	O
supports	O
querying	O
with	O
Gremlin	B-Language
along	O
with	O
SQL	B-Language
extended	O
for	O
graph	B-Application
traversal	O
.	O
</s>
<s>
OrientDB	B-Operating_System
uses	O
several	O
indexing	O
mechanisms	O
based	O
on	O
B-tree	B-Architecture
and	O
Extendible	B-Algorithm
hashing	I-Algorithm
,	O
the	O
last	O
one	O
is	O
known	O
as	O
"	O
hash	O
index	O
"	O
,	O
there	O
are	O
plans	O
to	O
implement	O
LSM-tree	B-Data_Structure
and	O
Fractal	B-Data_Structure
tree	I-Data_Structure
index	I-Data_Structure
based	O
indexes	O
.	O
</s>
<s>
Each	O
record	O
has	O
Surrogate	B-Application
key	I-Application
which	O
indicates	O
position	O
of	O
record	O
inside	O
of	O
Array	B-Data_Structure
list	I-Data_Structure
,	O
links	O
between	O
records	O
are	O
stored	O
either	O
as	O
single	O
value	O
of	O
record	O
's	O
position	O
stored	O
inside	O
of	O
referrer	O
or	O
as	O
B-tree	B-Architecture
of	O
record	O
positions	O
(	O
so-called	O
record	O
IDs	O
or	O
RIDs	O
)	O
which	O
allows	O
fast	O
traversal	O
(	O
with	O
O(1 )	O
complexity	O
)	O
of	O
one-to-many	O
relationships	O
and	O
fast	O
addition/removal	O
of	O
new	O
links	O
.	O
</s>
<s>
OrientDB	B-Operating_System
is	O
the	O
fifth	O
most	O
popular	O
graph	B-Application
database	I-Application
according	O
to	O
the	O
DB-Engines	B-Application
graph	B-Application
database	I-Application
ranking	O
,	O
as	O
of	O
December	O
2021	O
.	O
</s>
<s>
The	O
development	O
of	O
OrientDB	B-Operating_System
still	O
relies	O
on	O
an	O
open	O
source	O
community	O
led	O
by	O
OrientDB	B-Operating_System
LTD	O
company	O
created	O
by	O
its	O
original	O
author	O
Luca	O
Garulli	O
.	O
</s>
<s>
The	O
project	O
uses	O
GitHub	B-Application
to	O
manage	O
the	O
sources	O
,	O
contributors	O
and	O
versioning	O
,	O
Google	B-Application
Group	I-Application
and	O
Stack	B-Error_Name
Overflow	I-Error_Name
to	O
provide	O
free	O
support	O
to	O
the	O
worldwide	O
users	O
.	O
</s>
<s>
OrientDB	B-Operating_System
also	O
offers	O
a	O
free	O
Udemy	O
course	O
for	O
those	O
hoping	O
to	O
learn	O
the	O
basics	O
and	O
get	O
started	O
with	O
OrientDB	B-Operating_System
.	O
</s>
<s>
OrientDB	B-Operating_System
is	O
built	O
with	O
a	O
multi-model	O
graph/document	O
engine	O
.	O
</s>
<s>
OrientDB	B-Operating_System
feels	O
like	O
a	O
graph	B-Application
database	I-Application
first	O
,	O
but	O
there	O
's	O
no	O
reason	O
the	O
key-value	B-Data_Structure
store	I-Data_Structure
ca	O
n't	O
be	O
used	O
on	O
its	O
own	O
.	O
</s>
<s>
While	O
OrientDB	B-Operating_System
includes	O
a	O
SQL	B-Language
layer	O
,	O
the	O
support	O
for	O
edges	O
effectively	O
means	O
that	O
these	O
may	O
be	O
used	O
to	O
traverse	O
relationships	O
rather	O
than	O
employing	O
a	O
JOIN	B-Language
statement	I-Language
.	O
</s>
<s>
OrientDB	B-Operating_System
handles	O
every	O
record	O
/	O
document	B-General_Concept
as	O
an	O
object	B-Application
and	O
the	O
linking	O
between	O
objects	O
/	O
documents	O
is	O
not	O
through	O
references	O
,	O
it	O
's	O
direct	O
linking	O
(	O
saving	O
a	O
pointer	O
to	O
the	O
object	B-Application
)	O
.	O
</s>
<s>
OrientDB	B-Operating_System
Community	O
Edition	O
is	O
free	O
for	O
any	O
use	O
(	O
Apache	B-Application
2	I-Application
license	I-Application
)	O
.	O
</s>
<s>
Features	O
such	O
as	O
horizontal	O
scaling	O
,	O
fault	O
tolerance	O
,	O
clustering	O
,	O
sharding	B-General_Concept
,	O
and	O
replication	O
are	O
n’t	O
disabled	O
in	O
the	O
OrientDB	B-Operating_System
Community	O
Edition	O
.	O
</s>
<s>
OrientDB	B-Operating_System
Enterprise	O
Edition	O
is	O
the	O
commercial	O
extension	O
of	O
OrientDB	B-Operating_System
Community	O
Edition	O
created	O
to	O
handle	O
more	O
robust	O
and	O
demanding	O
use	O
cases	O
.	O
</s>
<s>
OrientDB	B-Operating_System
Enterprise	O
Edition	O
includes	O
additional	O
features	O
such	O
as	O
a	O
query	B-Language
profiler	O
,	O
distributed	O
clustering	O
configuration	O
,	O
metrics	O
recording	O
,	O
a	O
live	O
monitor	O
,	O
Teleporter	O
(	O
a	O
migration	O
tool	O
)	O
,	O
and	O
configurable	O
alerts	O
.	O
</s>
<s>
Graph	B-Application
structured	I-Application
data	O
model	O
:	O
native	O
management	O
of	O
graphs	O
.	O
</s>
<s>
Fully	O
compliant	O
with	O
the	O
Apache	B-Language
TinkerPop	I-Language
Gremlin	B-Language
(	O
previously	O
known	O
as	O
Blueprints	O
)	O
open	O
source	O
graph	B-Application
computing	O
framework	O
.	O
</s>
<s>
SQL	B-Language
:	O
supports	O
SQL	B-Language
queries	B-Language
with	O
extensions	O
to	O
handle	O
relationships	O
without	O
SQL	B-Language
join	I-Language
,	O
manage	O
trees	O
,	O
and	O
graphs	O
of	O
connected	O
documents	O
.	O
</s>
<s>
Web	O
technologies	O
:	O
natively	O
supports	O
HTTP	B-Protocol
,	O
RESTful	B-Protocol
protocol	O
,	O
and	O
JSON	B-General_Concept
additional	O
libraries	O
or	O
components	O
.	O
</s>
<s>
Distributed	O
:	O
full	O
support	O
for	O
multi-master	B-Operating_System
replication	I-Operating_System
including	O
geographically	O
distributed	O
clusters	O
.	O
</s>
<s>
Run	O
anywhere	O
:	O
implemented	O
using	O
pure	O
Java	B-Language
allowing	O
it	O
to	O
be	O
run	O
on	O
Linux	B-Application
,	O
OS	B-Operating_System
X	I-Operating_System
,	O
Windows	B-Application
,	O
or	O
any	O
system	O
with	O
a	O
compliant	O
JVM	B-Language
.	O
</s>
<s>
Apache	B-Application
2	I-Application
License	I-Application
:	O
always	O
free	O
for	O
any	O
usage	O
.	O
</s>
<s>
Commercial	O
support	O
is	O
available	O
from	O
OrientDB	B-Operating_System
.	O
</s>
<s>
Pattern	O
matching	O
:	O
Introduced	O
in	O
version	O
2.2	O
,	O
the	O
Match	O
statement	O
queries	B-Language
the	O
database	O
in	O
a	O
declarative	O
manner	O
,	O
using	O
pattern	O
matching	O
.	O
</s>
<s>
Security	O
features	O
introduced	O
in	O
OrientDB	B-Operating_System
2.2	O
provide	O
an	O
extensible	O
framework	O
for	O
adding	O
external	O
authenticators	O
,	O
password	O
validation	O
,	O
LDAP	O
import	O
of	O
database	O
roles	O
and	O
users	O
,	O
advanced	O
auditing	O
capabilities	O
,	O
and	O
syslog	O
support	O
.	O
</s>
<s>
OrientDB	B-Operating_System
Enterprise	O
Edition	O
provides	O
Kerberos	B-Protocol
(	O
protocol	O
)	O
authentication	O
full	O
browser	O
SPNEGO	B-Protocol
support	O
.	O
</s>
<s>
When	O
it	O
comes	O
to	O
database	O
encryption	O
,	O
starting	O
with	O
version	O
2.2	O
,	O
OrientDB	B-Operating_System
can	O
encrypt	O
records	O
on	O
disk	O
.	O
</s>
<s>
This	O
prevents	O
unauthorized	O
users	O
from	O
accessing	O
database	O
content	O
or	O
even	O
from	O
bypassing	O
OrientDB	B-Operating_System
security	O
.	O
</s>
<s>
Teleporter	O
:	O
Allows	O
relational	O
databases	B-Application
to	O
be	O
quickly	O
imported	O
into	O
OrientDB	B-Operating_System
in	O
few	O
simple	O
steps	O
.	O
</s>
<s>
OrientDB	B-Operating_System
was	O
originally	O
authored	O
by	O
Luca	O
Garulli	O
in	O
2010	O
.	O
</s>
<s>
Luca	O
wrote	O
it	O
as	O
a	O
Java	B-Language
rewrite	O
of	O
the	O
fast	O
persistent	O
layer	O
of	O
Orient	O
ODBMS	B-Application
database	O
(	O
originally	O
developed	O
by	O
Luca	O
Garulli	O
in	O
1999	O
in	O
C++	O
)	O
.	O
</s>
<s>
Since	O
2012	O
,	O
the	O
project	O
is	O
being	O
sponsored	O
by	O
OrientDB	B-Operating_System
LTD	O
(	O
former	O
Orient	O
Technologies	O
LTD	O
)	O
,	O
a	O
for-profit	O
company	O
with	O
Luca	O
as	O
its	O
CEO	O
and	O
founder	O
.	O
</s>
<s>
The	O
first	O
time	O
the	O
word	O
"	O
multi-model	O
"	O
has	O
been	O
associated	O
to	O
the	O
databases	B-Application
was	O
on	O
May	O
30	O
,	O
2012	O
in	O
Cologne	O
,	O
Germany	O
,	O
during	O
Luca	O
Garulli	O
's	O
keynote	O
"	O
NoSQL	B-General_Concept
Adoption	O
–	O
What	O
’s	O
the	O
Next	O
Step	O
?	O
"	O
.	O
</s>
<s>
Luca	O
Garulli	O
envisioned	O
the	O
evolution	O
of	O
the	O
1st	O
generation	O
NoSQL	B-General_Concept
products	O
into	O
new	O
products	O
with	O
more	O
features	O
able	O
to	O
be	O
used	O
by	O
multiple	O
use	O
cases	O
.	O
</s>
<s>
OrientDB	B-Operating_System
was	O
the	O
first	O
product	O
to	O
embrace	O
documents	O
,	O
graphs	O
,	O
key-value	O
,	O
geospatial	O
and	O
reactive	O
models	O
in	O
the	O
same	O
product	O
,	O
at	O
the	O
core	O
level	O
.	O
</s>
<s>
For	O
this	O
reason	O
,	O
OrientDB	B-Operating_System
is	O
a	O
"	O
Native	O
"	O
Multi-model	B-Operating_System
database	I-Operating_System
.	O
</s>
<s>
OrientDB	B-Operating_System
has	O
been	O
covered	O
by	O
media	O
outlets	O
and	O
is	O
the	O
winner	O
of	O
the	O
2015	O
InfoWorld	O
Bossie	O
award	O
.	O
</s>
<s>
On	O
September	O
15	O
,	O
2017	O
,	O
OrientDB	B-Operating_System
LTD	O
company	O
has	O
been	O
acquired	O
by	O
CallidusCloud	O
a	O
public	O
company	O
traded	O
on	O
NASDAQ	O
.	O
</s>
<s>
On	O
January	O
30	O
,	O
2018	O
,	O
it	O
was	O
announced	O
SAP	B-Application
(	O
company	O
)	O
acquired	O
CallidusCloud	O
for	O
$2.4	O
billion	O
.	O
</s>
<s>
and	O
therefore	O
OrientDB	B-Operating_System
is	O
now	O
supported	O
by	O
SAP	B-Application
(	O
company	O
)	O
.	O
</s>
<s>
On	O
September	O
1st	O
,	O
2021	O
,	O
the	O
original	O
founder	O
Luca	O
Garulli	O
left	O
SAP	B-Application
(	O
company	O
)	O
and	O
forked	O
the	O
project	O
into	O
ArcadeDB	O
after	O
SAP	B-Application
decided	O
to	O
stop	O
providing	O
commercial	O
support	O
for	O
OrientDB	B-Operating_System
.	O
</s>
