<s>
DataBlitz	B-Application
is	O
a	O
general	O
purpose	O
main	O
memory	O
database	B-Application
management	I-Application
system	I-Application
,	O
developed	O
by	O
Lucent	O
Bell	O
Labs	O
Research	O
from	O
1993	O
to	O
1995	O
.	O
</s>
<s>
It	O
was	O
originally	O
named	O
"	O
Dali	O
"	O
,	O
and	O
provided	O
recovery	O
and	O
concurrency	B-Operating_System
control	I-Operating_System
features	O
.	O
</s>
<s>
Later	O
,	O
Dali	O
was	O
renamed	O
as	O
"	O
DataBlitz	B-Application
"	O
.	O
</s>
<s>
DataBlitz	B-Application
provides	O
a	O
platform	O
for	O
building	O
high-performance	O
shared	O
memory	O
applications	O
that	O
can	O
survive	O
failures	O
or	O
organize	O
large	O
amounts	O
of	O
data	O
with	O
features	O
suited	O
to	O
many	O
applications	O
.	O
</s>
<s>
Applications	O
for	O
DataBlitz	B-Application
include	O
:	O
</s>
<s>
The	O
DataBlitz	B-Application
Relational	O
Manager	O
is	O
a	O
C++	O
class	O
library	O
interface	O
to	O
a	O
relational	O
system	O
with	O
SQL	O
support	O
limited	O
to	O
definition	O
statements	O
.	O
</s>
<s>
Referential	B-General_Concept
integrity	I-General_Concept
is	O
supported	O
(	O
foreign	O
key	O
constraints	O
)	O
,	O
as	O
are	O
null	O
values	O
,	O
date	O
and	O
time	O
attribute	O
types	O
,	O
and	O
variable	O
length	O
fields	O
.	O
</s>
<s>
DataBlitz	B-Application
also	O
provides	O
higher-layer	O
interfaces	O
for	O
grouping	O
related	O
data	O
items	O
,	O
and	O
performing	O
scans	O
as	O
well	O
as	O
associative	O
access	O
(	O
via	O
indices	O
)	O
on	O
data	O
items	O
in	O
a	O
group	O
...	O
</s>
<s>
Each	O
database	O
file	O
in	O
DataBlitz	B-Application
consists	O
of	O
segments	O
,	O
which	O
are	O
contiguous	O
page-aligned	O
units	O
of	O
allocation	O
,	O
similar	O
to	O
clusters	O
in	O
a	O
file	B-Application
system	I-Application
.	O
</s>
<s>
Upon	O
allocation	O
within	O
a	O
chunk	O
,	O
the	O
system	O
returns	O
a	O
standard	O
DataBlitz	B-Application
pointer	O
to	O
the	O
space	O
,	O
which	O
specifies	O
the	O
offset	O
within	O
the	O
file	O
.	O
</s>
<s>
In	O
DataBlitz	B-Application
,	O
data	O
can	O
be	O
replicated	O
across	O
multiple	O
DataBlitz	B-Application
instances	O
running	O
on	O
machines	O
connected	O
by	O
a	O
network	O
in	O
a	O
distributed	O
environment	O
.	O
</s>
<s>
The	O
primary	O
benefits	O
of	O
data	B-Architecture
replication	I-Architecture
are	O
higher	O
availability	O
and	O
improved	O
performance	O
.	O
</s>
<s>
DataBlitz	B-Application
provides	O
support	O
for	O
data	B-Architecture
replication	I-Architecture
at	O
the	O
granularity	O
of	O
tables	O
.	O
</s>
