i) Difference between ps, esds, ii) Difference between lrecl, blksize among P

i) Difference between ps, esds,

ii) Difference between lrecl, blksize among PS, PDS issues?
i.e in jcl at dcb

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i) Difference between ps, esds, ii) Difference between lrecl, blksize among PS, PDS issues? i.e..

Answer / tanmay

(i)Ps stands for Physical sequential data set and ESDS is a
VSAM data set defined as Entry sequenced data set.In ESDS
records are processed one at a time in the order which they
were loaded.

(ii)lrecl stands for logical record length and blocksize
will be the multiple of lrecl.Lrecl gives the actual length
of the record and block size tells what unit of bloch has
been assigned on the DASD for that record.In DCB of JCL the
diference between PS and PDS are that the PDS will contain
one extra quantity called "directory blocks" alongwith
primary and secondary quantity whereas Physical Sequential
(PS) will contain only the primary and secondary quantity.

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i) Difference between ps, esds, ii) Difference between lrecl, blksize among PS, PDS issues? i.e..

Answer / sush

PS IS THE NONVSAM DATASET AND ESDS IS THE VSAM DATASET.

LRECL IS THE LENGTH OF THE RECORDS IN PS OR PDS.

WHERE AS THE BLOCK SIZE IS THE AMOUNT OF VOLUME WHIH THE
JOB CAN OCCUPY ON THE DASD.
SYNTAX FOR DCB=(TRK,(PRIMARY,SECONDARY,BLOCK
SIZE),RLSSE,ROUND)
IN DCB PARAMETER FOR PS WE DONT GIVE DIRECTORY BLOCK SIZE
AS WE CANNOT ADD MEMBER IN PS WHERE AS IN PDS IT IS
MANDATORY AS IT DEFINES THE NO NUMBER OF MEMBERS THAT CAN
BE ADDED IN THE PDS BY FORMULA (6*N)-1 WHERE N= NO IN
DIRECTORY BLOCK FIELD

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