<s>
Perst	B-Application
is	O
an	O
open	B-Application
source	I-Application
,	O
dual	O
license	O
,	O
object-oriented	B-Application
embedded	B-Application
database	I-Application
management	O
system	O
(	O
ODBMS	B-Application
)	O
.	O
</s>
<s>
Both	O
the	O
Java	B-Language
programming	I-Language
language	I-Language
,	O
and	O
the	O
C#	B-Application
programming	O
language	O
versions	O
are	O
compact	O
and	O
Perst	B-Application
has	O
been	O
implemented	O
on	O
smart	B-Application
phones	I-Application
running	O
the	O
Android	B-Application
and	O
Windows	B-Protocol
Phone	I-Protocol
(	O
WP7	O
)	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
Perst	B-Application
was	O
launched	O
in	O
2003	O
,	O
in	O
Russia	O
.	O
</s>
<s>
It	O
was	O
designed	O
to	O
achieve	O
high-performance	O
by	O
tightly	O
integrating	O
the	O
database	O
with	O
the	O
programming	O
language	O
:	O
Perst	B-Application
directly	O
stores	O
data	O
in	O
the	O
language	O
objects	O
.	O
</s>
<s>
In	O
2006	O
McObject	O
LLC	O
,	O
based	O
in	O
Issaquah	O
,	O
WA	O
took	O
over	O
the	O
development	O
of	O
Perst	B-Application
.	O
</s>
<s>
Perst	B-Application
was	O
first	O
written	O
in	O
Java	B-Language
,	O
and	O
ported	O
to	O
C#	B-Application
.	O
</s>
<s>
Although	O
originally	O
designed	O
for	O
desktop	O
-	O
and	O
server-based	O
software	O
,	O
Perst	B-Application
has	O
also	O
found	O
usage	O
in	O
providing	O
database	B-Application
management	I-Application
for	O
mobile	O
applications	O
running	O
on	O
devices	O
such	O
as	O
smartphones	B-Application
.	O
</s>
<s>
These	O
mobile	O
devices	O
typically	O
have	O
hardware	O
constraints	O
,	O
with	O
limited	O
RAM	B-Architecture
and	O
few	O
CPU	O
cycles	O
available	O
and	O
non-standard	O
(	O
for	O
database	B-Application
systems	I-Application
)	O
operating	O
requirements	O
(	O
such	O
as	O
support	O
for	O
Java	B-Language
ME	I-Language
,	O
or	O
Silverlight	B-Application
in	O
the	O
Windows	B-Protocol
Phone	I-Protocol
7	O
mobile	O
platform	O
)	O
.	O
</s>
<s>
Currently	O
available	O
versions	O
of	O
Perst	B-Application
are	O
Perst	B-Application
for	O
.NET	B-Application
,	O
Perst	B-Application
for	O
Java	B-Language
and	O
Perst	B-Application
Lite	O
.	O
</s>
<s>
Perst	B-Application
for	O
Java	B-Language
and	O
Perst	B-Application
Lite	O
are	O
bundled	O
in	O
a	O
single	O
software	O
distribution	O
.	O
</s>
<s>
Perst	B-Application
for	O
.NET	B-Application
supports	O
C#	B-Application
versions	O
1.0	O
and	O
2.0	O
with	O
the	O
same	O
source	O
code	O
.	O
</s>
<s>
Support	O
for	O
specific	O
C#	B-Application
2.0	O
features	O
(	O
such	O
as	O
template	O
classes	O
)	O
is	O
provided	O
at	O
compile	O
time	O
.	O
</s>
<s>
It	O
is	O
compatible	O
with	O
both	O
standard	O
and	O
compact	O
.NET	B-Application
frameworks	I-Application
,	O
as	O
well	O
as	O
Silverlight	B-Application
,	O
and	O
can	O
operate	O
on	O
both	O
Microsoft	B-Protocol
Windows	I-Protocol
Phone	I-Protocol
7	O
(	O
WP7	O
)	O
and	O
Windows	B-Device
Embedded	I-Device
Compact	I-Device
(	O
formerly	O
Windows	O
CE	O
)	O
.	O
</s>
<s>
Perst	B-Application
for	O
Java	B-Language
supports	O
J2SE/J2EE	O
versions	O
1.3	O
and	O
1.4	O
,	O
as	O
well	O
as	O
J2SE/J2EE	O
version	O
5	O
.	O
</s>
<s>
It	O
is	O
compatible	O
with	O
the	O
Android	B-Application
smartphone	B-Application
environment	O
.	O
</s>
<s>
Perst	B-Application
Lite	O
is	O
the	O
Perst	B-Application
for	O
Java	B-Language
implementation	O
that	O
runs	O
on	O
devices	O
(	O
such	O
as	O
BlackBerry	B-Operating_System
smartphones	B-Application
)	O
based	O
on	O
the	O
Java	B-Language
ME	I-Language
(	O
J2ME	B-Language
)	O
mobile	O
device	O
platform	O
.	O
</s>
<s>
It	O
has	O
a	O
memory	O
footprint	O
approximately	O
30	O
percent	O
smaller	O
than	O
standard	O
Perst	B-Application
.	O
</s>
<s>
The	O
Perst	B-Application
engine	O
’s	O
size	O
is	O
5,000	O
lines	O
of	O
source	O
code	O
,	O
and	O
its	O
run	B-Library
time	I-Library
random-access	B-Architecture
memory	I-Architecture
(	O
RAM	B-Architecture
)	O
needs	O
range	O
from	O
30K	O
to	O
300K.	O
]	O
</s>
<s>
Perst	B-Application
transactions	B-General_Concept
support	O
the	O
ACID	O
properties	O
(	O
atomicity	O
,	O
consistency	O
,	O
isolation	O
,	O
durability	O
)	O
with	O
automatic	O
recovery	O
.	O
</s>
<s>
Perst	B-Application
provides	O
a	O
subset	O
of	O
SQL	B-Language
for	O
filtering	O
elements	O
of	O
a	O
container	B-Application
class	I-Application
.	O
</s>
<s>
For	O
access	O
to	O
stored	O
objects	O
,	O
Perst	B-Application
implements	O
specialized	O
collection	O
classes	O
including	O
:	O
</s>
<s>
To	O
facilitate	O
changes	O
to	O
an	O
existing	O
database	O
design	O
(	O
database	B-Application
schema	I-Application
)	O
,	O
Perst	B-Application
implements	O
“	O
lazy	O
”	O
database	B-Application
schema	I-Application
evolution	O
.	O
</s>
<s>
ProScout	O
is	O
a	O
demo	O
midlet	O
for	O
using	O
Perst	B-Application
Lite	O
in	O
the	O
Java	B-Language
ME	I-Language
environment	O
.	O
</s>
<s>
Originally	O
implemented	O
for	O
the	O
Blackberry	B-Operating_System
,	O
it	O
has	O
also	O
been	O
deployed	O
on	O
the	O
Nokia	B-Language
S60	I-Language
.	O
</s>
<s>
McObject	O
provides	O
a	O
demo	O
app	O
of	O
a	O
CRM	O
system	O
using	O
Perst	B-Application
for	O
.NET	B-Application
,	O
including	O
a	O
fully	O
text-searchable	O
contact	O
database	O
that	O
runs	O
in	O
the	O
desktop	O
browser	O
in	O
Silverlight	B-Application
.	O
</s>
<s>
Andy	O
Wigley	O
,	O
of	O
appamundi	O
,	O
ported	O
this	O
demo	O
app	O
to	O
Windows	B-Protocol
Phone	I-Protocol
and	O
described	O
the	O
project	O
in	O
a	O
series	O
of	O
blog	O
postings	O
.	O
</s>
<s>
Users	O
can	O
redistribute	O
and/or	O
modify	O
Perst	B-Application
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
version	O
2	O
or	O
later	O
)	O
as	O
published	O
by	O
the	B-Operating_System
Free	I-Operating_System
Software	I-Operating_System
Foundation	I-Operating_System
.	O
</s>
<s>
For	O
individuals	O
or	O
organizations	O
that	O
cannot	O
or	O
do	O
not	O
wish	O
to	O
comply	O
with	O
the	O
GPL	B-License
,	O
a	O
commercial	O
license	O
is	O
available	O
from	O
McObject	O
.	O
</s>
