<s>
Firebird	B-Application
is	O
an	O
open-source	B-Application
SQL	B-Language
relational	B-Application
database	I-Application
management	I-Application
system	I-Application
that	O
supports	O
Linux	B-Application
,	O
Microsoft	B-Application
Windows	I-Application
,	O
macOS	B-Operating_System
and	O
other	O
Unix	B-Application
platforms	O
.	O
</s>
<s>
The	O
database	O
forked	B-Application
from	O
Borland	O
's	O
open	O
source	O
edition	O
of	O
InterBase	B-Application
in	O
2000	O
but	O
the	O
code	O
has	O
been	O
largely	O
rewritten	O
since	O
Firebird	B-Application
1.5	O
.	O
</s>
<s>
Within	O
a	O
week	O
of	O
the	O
InterBase	B-Application
6.0	O
source	O
being	O
released	O
by	O
Borland	O
on	O
25	O
July	O
2000	O
,	O
the	O
Firebird	B-Application
project	O
was	O
created	O
on	O
SourceForge	B-Application
.	O
</s>
<s>
Firebird	B-Application
1.0	O
was	O
released	O
for	O
Linux	B-Application
,	O
Microsoft	B-Application
Windows	I-Application
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
on	O
11	O
March	O
2002	O
,	O
with	O
ports	O
to	O
Solaris	B-Application
,	O
FreeBSD	O
4	O
,	O
HP-UX	B-Application
over	O
the	O
next	O
two	O
months	O
.	O
</s>
<s>
Work	O
on	O
porting	O
the	O
codebase	O
from	O
C	B-Language
to	O
C++	B-Language
began	O
in	O
2000	O
.	O
</s>
<s>
On	O
23	O
February	O
2004	O
,	O
Firebird	B-Application
1.5	O
was	O
released	O
,	O
which	O
was	O
the	O
first	O
stable	O
release	O
of	O
the	O
new	O
codebase	O
.	O
</s>
<s>
Version	O
1.5	O
featured	O
an	O
improved	O
query	B-Language
optimizer	I-Language
,	O
SQL-92	B-Language
conditional	O
expressions	O
,	O
SQL:1999	B-Language
savepoints	B-General_Concept
and	O
support	O
for	O
explicit	O
locking	B-Operating_System
.	O
</s>
<s>
Firebird	B-Application
2.0	O
was	O
released	O
on	O
12	O
November	O
2006	O
,	O
adding	O
support	O
for	O
64-bit	B-Device
architectures	I-Device
,	O
tables	O
nested	O
in	O
FROM	B-Language
clauses	I-Language
,	O
and	O
programmable	O
lock	B-Operating_System
timeouts	O
in	O
blocking	B-Operating_System
transactions	B-General_Concept
.	O
</s>
<s>
The	O
previous	O
stable	O
release	O
was	O
version	O
2.1.6	O
,	O
which	O
added	O
new	O
features	O
including	O
procedural	B-Language
triggers	I-Language
,	O
recursive	B-Language
queries	I-Language
,	O
and	O
support	O
for	O
SQL:2003	B-Language
MERGE	B-Language
statements	O
.	O
</s>
<s>
Firebird	B-Application
2.5	O
introduced	O
new	O
features	O
like	O
improved	O
multithreading	B-Operating_System
,	O
regular	B-Language
expression	I-Language
syntax	O
and	O
the	O
ability	O
to	O
query	O
remote	O
databases	O
.	O
</s>
<s>
The	O
most	O
recent	O
stable	O
version	O
is	O
Firebird	B-Application
3.0	O
,	O
released	O
19	O
April	O
2016	O
,	O
with	O
focus	O
in	O
performance	O
and	O
security	O
.	O
</s>
<s>
A	O
major	O
re-architecture	O
of	O
the	O
code	O
allowed	O
total	O
support	O
to	O
SMP	B-Operating_System
machines	O
when	O
using	O
the	O
SuperServer	O
version	O
.	O
</s>
<s>
Through	O
the	O
Google	B-Application
Summer	I-Application
of	I-Application
Code	I-Application
2013	O
work	O
has	O
begun	O
on	O
integrating	O
Firebird	B-Application
as	O
a	O
replacement	O
for	O
HSQLDB	B-Application
in	O
LibreOffice	B-Operating_System
Base	I-Operating_System
.	O
</s>
<s>
In	O
April	O
2003	O
,	O
the	O
Mozilla	O
Organization	O
announced	O
a	O
rename	O
of	O
its	O
web	B-Application
browser	I-Application
from	O
Phoenix	B-Application
to	O
Firebird	B-Application
after	O
a	O
trademark	O
dispute	O
with	O
Phoenix	B-Application
Technologies	O
.	O
</s>
<s>
This	O
decision	O
caused	O
concern	O
within	O
the	O
Firebird	B-Application
database	O
project	O
due	O
to	O
the	O
assumption	O
that	O
users	O
and	O
Internet	O
search	O
engines	O
would	O
be	O
confused	O
by	O
a	O
database	O
and	O
a	O
web	B-Application
browser	I-Application
both	O
using	O
the	O
name	O
Firebird	B-Application
.	O
</s>
<s>
The	O
Mozilla	O
developers	O
issued	O
a	O
statement	O
,	O
making	O
clear	O
that	O
their	O
software	O
package	O
was	O
called	O
"	O
Mozilla	B-Application
Firebird	I-Application
"	O
,	O
not	O
"	O
Firebird	B-Application
"	O
.	O
</s>
<s>
The	O
statement	O
also	O
said	O
that	O
the	O
Mozilla	B-Application
Firebird	I-Application
name	O
was	O
a	O
project	O
codename	O
.	O
</s>
<s>
The	O
dispute	O
was	O
resolved	O
on	O
9	O
February	O
2004	O
,	O
when	O
Mozilla	O
changed	O
the	O
name	O
of	O
its	O
browser	B-Application
to	O
Mozilla	B-Application
Firefox	I-Application
,	O
thus	O
ending	O
the	O
conflict	O
.	O
</s>
<s>
Firebird	B-Application
inherited	O
the	O
storage	O
architecture	O
of	O
Interbase	B-Application
.	O
</s>
<s>
To	O
ensure	O
the	O
ACID	B-Operating_System
properties	I-Operating_System
of	O
transactions	B-General_Concept
,	O
the	O
database	O
engine	O
keeps	O
different	O
versions	O
of	O
each	O
record	O
changed	O
by	O
the	O
active	O
users	O
in	O
the	O
database	O
.	O
</s>
<s>
When	O
the	O
transactions	B-General_Concept
are	O
committed	O
,	O
the	O
last	O
version	O
of	O
every	O
changed	O
record	O
is	O
marked	O
as	O
the	O
definitive	O
.	O
</s>
<s>
If	O
transactions	B-General_Concept
are	O
rolled	O
back	O
,	O
the	O
database	O
engine	O
keeps	O
the	O
mark	O
on	O
the	O
original	O
record	O
versions	O
,	O
leaving	O
them	O
untouched	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
Firebird	B-Application
disk	O
writes	O
are	O
very	O
reduced	O
compared	O
to	O
databases	O
that	O
use	O
the	O
traditional	O
transaction	O
log	O
architecture	O
.	O
</s>
<s>
Writing	O
transactions	B-General_Concept
does	O
not	O
prevent	O
reading	O
and	O
vice	O
versa	O
,	O
because	O
each	O
one	O
sees	O
its	O
own	O
version	O
of	O
the	O
database	O
.	O
</s>
<s>
The	O
multi-generational	O
architecture	O
ensures	O
that	O
OLTP	O
and	O
DSS/OLAP	O
operations	O
can	O
be	O
run	O
simultaneously	O
without	O
the	O
delays	O
caused	O
by	O
locking	B-Operating_System
mechanisms	O
found	O
in	O
other	O
products	O
.	O
</s>
<s>
Firebird	B-Application
makes	O
all	O
indices	O
of	O
the	O
database	O
behave	O
like	O
well-tuned	O
"	O
clustered	O
indexes	O
"	O
used	O
by	O
other	O
architectures	O
.	O
</s>
<s>
Firebird	B-Application
index	O
buckets	O
are	O
n't	O
subject	O
to	O
two-phase	O
locking	B-Operating_System
,	O
and	O
boolean	O
"	O
and	O
"	O
and	O
"	O
or	O
"	O
operations	O
can	O
be	O
performed	O
on	O
intermediate	O
bitmaps	O
at	O
a	O
negligible	O
cost	O
,	O
eliminating	O
the	O
need	O
for	O
the	O
optimizer	O
to	O
choose	O
between	O
alternative	O
indexes	O
.	O
</s>
<s>
The	O
Firebird	B-Application
database	O
engine	O
and	O
its	O
modules	O
are	O
released	O
under	O
an	O
open-source	B-Application
license	O
,	O
the	O
Initial	O
Developer	O
's	O
Public	O
License	O
(	O
IDPL	O
)	O
,	O
a	O
variant	O
of	O
the	O
Mozilla	B-License
Public	I-License
License	I-License
(	O
MPL	O
)	O
version	O
1.1	O
.	O
</s>
<s>
It	O
does	O
not	O
require	O
the	O
developer	O
to	O
open	O
the	O
products	O
using	O
Firebird	B-Application
or	O
even	O
custom-derivatives	O
made	O
from	O
its	O
source	O
code	O
,	O
but	O
if	O
the	O
developer	O
chooses	O
to	O
do	O
so	O
,	O
then	O
some	O
terms	O
and	O
conditions	O
should	O
be	O
honored	O
.	O
</s>
<s>
The	O
IDPL	O
allows	O
the	O
developer	O
to	O
make	O
proprietary	O
,	O
closed-source	O
applications	O
that	O
use	O
Firebird	B-Application
or	O
are	O
based	O
on	O
it	O
.	O
</s>
<s>
The	O
Firebird	B-Application
native	O
API	O
is	O
used	O
directly	O
or	O
indirectly	O
by	O
applications	O
or	O
middleware	O
that	O
connect	O
to	O
a	O
Firebird	B-Application
database	O
.	O
</s>
<s>
It	O
is	O
implemented	O
in	O
the	O
client	O
library	O
,	O
fbclient.dll	O
,	O
on	O
Windows	O
systems	O
,	O
and	O
in	O
libfbclient.so	O
on	O
Unix	B-Application
ones	O
.	O
</s>
<s>
Embedded	B-Language
SQL	I-Language
is	O
a	O
technique	O
that	O
simplifies	O
the	O
development	O
of	O
C/C	O
++	O
and	O
COBOL	O
Firebird	B-Application
applications	O
,	O
by	O
using	O
a	O
preprocessor	B-General_Concept
called	O
gpre	O
,	O
which	O
allows	O
the	O
embedding	O
of	O
SQL	B-Language
statements	O
directly	O
into	O
the	O
source	O
code	O
of	O
the	O
host	O
language	O
.	O
</s>
<s>
SourceForge	B-Application
Community	O
Choice	O
Award	O
:	O
Best	O
Project	O
for	O
enterprise	O
,	O
Best	O
user	O
support	O
.	O
</s>
<s>
SourceForge	B-Application
Community	O
Choice	O
Award	O
:	O
Best	O
Project	O
for	O
enterprise	O
.	O
</s>
