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 ?
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 |
Post New Answer View All Answers
what is buffering and how does it apply to vsam files ?
if you wish to use the rewrite command how must the vsam file be opened?
What is a ca split?
how can you copy to a vsam cluster?
How do you define an altindx?
How to get the last record in vsam file in cluster? And how can u get the ksds file records into cobol program?
What is the place for VSAM KSDS?
What is a ci split?
in a cobol select statement, can you tell what is the organization for a ksds?
What are the advantages of vsam over isam?
what are the codes returned by the ams (access method services) command during the execution in vsam?
write a program to read from a VSAM file , there will be a 5 records to create name. empno. resignation and address to update in a db2 table and call another program using dynamic call to find the matching fields in program 1 to update in db2 table. anybody pls send de program for dis ? thanks in advance...
What is a base cluste?
to use the rewrite command, how should the vsam file be opened?
what is the meaning of each of the values in shareopts(2 3)?