<s>
Long-running	B-General_Concept
transactions	I-General_Concept
(	O
also	O
known	O
as	O
the	O
saga	B-General_Concept
interaction	I-General_Concept
pattern	I-General_Concept
)	O
are	O
computer	O
database	B-General_Concept
transactions	I-General_Concept
that	O
avoid	O
locks	B-Operating_System
on	O
non-local	O
resources	O
,	O
use	O
compensation	O
to	O
handle	O
failures	O
,	O
potentially	O
aggregate	O
smaller	O
ACID	O
transactions	O
(	O
also	O
referred	O
to	O
as	O
atomic	B-General_Concept
transactions	I-General_Concept
)	O
,	O
and	O
typically	O
use	O
a	O
coordinator	O
to	O
complete	O
or	O
abort	O
the	O
transaction	O
.	O
</s>
<s>
In	O
contrast	O
to	O
rollback	B-Application
in	O
ACID	O
transactions	O
,	O
compensation	O
restores	O
the	O
original	O
state	O
,	O
or	O
an	O
equivalent	O
,	O
and	O
is	O
business-specific	O
.	O
</s>
<s>
A	O
number	O
of	O
protocols	O
have	O
been	O
specified	O
for	O
long-running	B-General_Concept
transactions	I-General_Concept
using	O
Web	O
services	O
within	O
business	O
processes	O
.	O
</s>
<s>
These	O
protocols	O
use	O
a	O
coordinator	O
to	O
mediate	O
the	O
successful	O
completion	O
or	O
use	O
of	O
compensation	O
in	O
a	O
long-running	B-General_Concept
transaction	I-General_Concept
.	O
</s>
