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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 Posted / 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 |
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explain in brief why do vsam take more disk space than other utilities?
What is a vsam dataset?
what are s0c1, s0c4, s0c5, s0c7 abends?
Explain the biggest disadvantage of using a vsam dataset?
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what are the codes returned by the ams (access method services) command during the execution in vsam?
Is it slower if you access a record through alt index as compared to primary index?
Why is it required to have a keyed directed retrieval?
What makes vrrds different from vsam?
What is the purpose of idcams?
What is the biggest disadvantage of using a vsam dataset?
Tell about the ams used in vsam?
