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How Vsam was evolved? What was the equivalent file for
ESDS,KSDS and RRDS prior to evolution? What were their
disadvantages of those file which leads to evolution of
ESDS,KSDS and RRDS files ?
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Answer / anand r
ESDS
in batch it acts like a flat file
organizanition-sequential
Accessmode is sequential
in online we can read and write the records random manner
by using the key field
KSDS
Access mode: sequential,random and dynamic is possible
like indexed file
RRDS:
like KSDS we can use all the access modes and records are
accessed using RID (record identification No) thats
relative key
| Is This Answer Correct ? | 2 Yes | 3 No |
can alternate index use in ESDS since it does not contain primary index? if yes can you explain?
what are s0c1, s0c4, s0c5, s0c7 abends?
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
why ci and ca splits are not possible in esds and rrds?
How do you convert flat files to VSAM files ?
What is a base cluste?
Can we copy a sequential file to a VSAM file ? If yes, What will happen of the size of the sequential file is bigger than that of the VSAM file?
what do you mean by recovery and speed parameters in define cluster command?
What is a CA, control area?
What is a ci split? What is a ca split?
What is the difference between lds and esds?
On which dataset you can have alt index?
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