Answer / ram

In physical sequential file records are stored in terms of
blocks,where as in VSAM files records are stored in
ControlInterval(C.I).

Answer / manjula

PS files can be created on tapes while the VSAM files
cannot. Also, VSAM files can have ALTINDX(alternate index)
while no such facility exists for PS files.

Answer / tanushree

Storage capacity of VSAM file is more than that of NON-Vsam file.
in VSAM if tale 1 trk => 1+1*122=123 extent allocation.
where as in NON-VSAM, for 1 trk => 1+1*15=16 extent allocation.

Answer / avinash kumar techrel

ps file is used for writing a program and storing data.but
vsam used only for storing data.ps file accessed
sequentially.but vsam accessed sequentially,randomlyand
dynamically.

Answer / vivek

VSAM files are used when we want to store data based on
some key fields(Eg: KSDS)
access method is indexed.
NON VSAM files like PS are used when we want to store data
which is not unique and also the access is sequential.

Answer / ram

online environment cannot access ps(batch)
but vsam can

Answer / vignesh

A)
1.ISPF panel or a standard JCL is used for creation of a PS
files.
2.AMS program is used to create the VSAM files

B)
1.Information about PS files is stroed as dataset labels in
the VTOC(VOLUME TABLE OF CONTENTS).
2.VSAM is stored in CATALOG.

I have three fields in a Variable VSAM file X(2) Y(10) occurs X times Z(02) Say for the first record X=2 then the length of the file is 2+(10*3)+2=34 second record, x=4 then 4+(10*4)+2=46 If any time if the field x is updated then the total length changes. Is it feasible? Is it

2 Answers  

Yes. Because the alternate key would first locate the primary key, which in turn locates the actual record. Needs twice the number of I/Os.

0 Answers  

What is the main function of linear dataset?

0 Answers  

difference between vsam and database tables

0 Answers   IBM,

can any one tell "in esds in what structure records will stored?"

1 Answers  

what are s0c1, s0c4, s0c5, s0c7 abends?

0 Answers   IBM,

Tell me how many alternate indexes you can have on a dataset?

0 Answers  

in what type of vsam datasets can an alternate index be defined??

4 Answers  

What is the index set?

1 Answers  

explain how many ways you can load data in a vsam cluster?

0 Answers   IBM,

What is free space?

1 Answers  

What is a ci split? What is a ca split?

0 Answers