1. How can I create a LF using crtlf command based on a
particular member in a multimember PF? Where I have to
specify the member name?

2. How to differentiate between the types of join from a
Join logical file DDS. Is it possible to have different
types of Join Logical files?

3.Any performance difference between Opnqrf and Embedded
SQL? When I
should prefer Opnqryf and when SQL?

4.
I know access path is the path chosen by the program to
retrieve data.
It can be of keyed access path or arrival sequence.
*IMMED- *IMMED description says access path is updated each time
record is added or deleted from a member. - What is updating
here?
*REBLD - The access path is completely rebuilt each time a file
member is opened. The access path is maintained until the
member is
closed, then the access path is deleted. - I am not able to
understand this completely.

Could anyone explain these more clearly?

5.What is the purpose of using activation group. I know it
is a resource allocator, but other than this any other
benefits of using an activation group?

Answers were Sorted based on User's Feedback



1. How can I create a LF using crtlf command based on a particular member in a multimember PF? Wher..

Answer / hit1

ans-1: use crtlf and hit f4 there is a option of phy file and the desire member u wanna use.

Is This Answer Correct ?    3 Yes 1 No

1. How can I create a LF using crtlf command based on a particular member in a multimember PF? Wher..

Answer / harsha sen

2.Yes ,it is possible to know the type of join by DDS.
If we are joining two files,with JREF(primary file) thn it will Inner join.

If we have specified JDFTVAL ,then it will become left outer join.Because all records from primary file will be selected and only matching records from secondary file will be selected.

if we are joining same file ,like,JFILE (PF01 PF01) ,this is a self join.

Is This Answer Correct ?    0 Yes 0 No

Post New Answer

More DB400 Interview Questions

i have a PF,it contains 5 members,how to access particular member data from logical file ?and what is the use of member in PF

3 Answers  


can any one tell me what is meant by PSSR? Kindly elaborate it...

1 Answers  


Can anybody tell why Journalling is compulsary before Commitment Control?

2 Answers  


can we concate fileds in physical file? If yes how can we do?

5 Answers   Patni,


Why we create the Physical File Member?

5 Answers  


How to index LF by relative record no (RRN)

0 Answers  


How can we know that a trigger has been added on a PF? and what is the purpose of adding a trigger?

3 Answers  


what is exception and how many types of exception

1 Answers   Active Brains,


What is the interactive job? What is the batch job?

0 Answers  


I want to change the attribute of field or want to add new field in existing PF but condition is format level identifier should not change, is it possible?

9 Answers   Mind Tree, TCS,


I have a PF with out any data but the dependent LF is having data?

1 Answers   HCL,


Define interactive jobs and batch jobs

6 Answers  


Categories