Question { IBM, 33535 }

How we can delete all the Logical File of a Physical file
in one instance ?

Answer

i have copied a pf from another one and after updating that
pf ,i used it in my program.It was giving me an error.
After compiling the program i have found that it was
refering to previous record name.
Then in command line in CHGPF i mentioned program name and
source file name.
you will get 'Delete dependent logical file' option,make
it '*yes'.
That is how i deleted all the references.

Question { 8958 }

I know chain keyword retreive records randomly but how chain
keyword exactly works internally????

Answer

hello ,
see chain opcode locks the first record of pf and then
starts reading.it is useful when there are multiple
receivers present in your program and you want any specific
receiver.
it is always used with HIGH indicator.