<s>
An	O
entry-sequenced	O
data	B-Application
set	I-Application
(	O
ESDS	O
)	O
is	O
a	O
type	O
of	O
data	B-Application
set	I-Application
used	O
by	O
IBM	O
's	O
VSAM	O
computer	O
data	O
storage	O
system	O
.	O
</s>
<s>
Records	O
are	O
accessed	O
based	O
on	O
their	O
sequential	O
order	O
,	O
that	O
is	O
,	O
the	O
order	O
in	O
which	O
they	O
were	O
written	O
to	O
the	O
file	O
;	O
which	O
means	O
that	O
accessing	O
a	O
particular	O
record	O
involves	O
searching	O
all	O
the	O
records	O
sequentially	B-General_Concept
until	O
it	O
is	O
located	O
,	O
or	O
by	O
using	O
a	O
relative	O
physical	O
address	O
(	O
Relative	B-Application
byte	I-Application
address	I-Application
,	O
RBA	O
)	O
,	O
i.e.	O
</s>
