Tags

, , , ,

ESDS
KSDS Fixed-length
RRDS
Variable-length
RRDS
Linear data sets
Records are in the
same order as
they are entered
Records are in
Collating
sequence by key
field after load
Records are in
relative record
number order
Records are in
relative record
number order
No processing at
record
Records can be
fixed or variable
length
Records can be
fixed or variable
length
Records have
fixed length
Records have
variable length
No processing at
record level
Direct access by
RBA
Direct access by
key or by RBA
Direct access by
relative record
number
Direct access by
relative record
number
Access with
Data-In-Virtual
(DIV) optionally
Consist of data
component only
Consist of data
and index
components
Consist of data
component only
Consist of data
and index
components
Consist of data
component only
Alternate index
allowed
Alternate indexes
allowed
No alternate index
allowed
No alternate index
allowed
No alternate index
allowed
A record’s RBA
cannot change
A record’s RBA
can change
A record’s relative
record number
cannot change
A record’s relative
record number
cannot change
No processing at
record level
Space at the end
of the data set is
used for adding

records

Free space is
used for inserting
and lengthening

records

Empty slots is in
the data set are
used for adding

records

Free space is
used for inserting
and lengthening

records

No processing at
record level
A record cannot
be deleted, but
you can reuse its

space for a record

of the same length

Space given up by
a deleted or
shortened record
becomes free

space

A slot given up by
a deleted record
can be reused
Space given up by
a deleted or
shortened record
becomes free

space

No processing at
record level
Spanned records
allowed
Spanned records
allowed
No spanned
records
No spanned
records
No spanned
records
Extended format
allowed
Extended format
or compression
allowed
Extended format
allowed
Extended format
allowed
Extended format
allowed
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