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JCL Interview Questions & Answers - Learning Mode

JCL Interview Questions & Answers - Learning Mode

Job Control Language (JCL) is a scripting language used on IBM mainframe operating systems to instruct the system on how to run a batch job or start a subsystem. JCL (job control language) is a language for describing jobs (units of work) to the MVS, OS/390, and VSE operating systems, which run on IBM's S/390 large server (mainframe) computers. These operating systems allocate their time and space resources among the total number of jobs that have been started in the computer.

Try JCL Interview Questions & Answers - Exam Mode

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JCL Interview Questions & Answers - Learning Mode
Try JCL Interview Questions & Answers - Exam Mode
Question: What is abend s322

Answer: S322 means the system has run out on the CPU time and the job is being cancelled. My first guess is, check your program if it went into any infinite loop, if not try to change the class and Time keyord parameters in the JCL. If you still get the Abend I would say you have a problem in your COBOL program... check the loops..

Question: What is the use of sysprint, sysin, sysout, dummy in jcl ?

Answer: SYSPRINT: All system output will appear under this DD card. Suppose you are copy'ing a VSAM file using IDCAMS. Then, number of records processed, highest condition code etc.. will appear under sysprint. You cannot customise SYSPRINT output.

SYSIN: This is nothing but SYStem INstruction. Suppose, you want to sort a file on certain key. You have to have following command under SYSIN.

SORT FIELDS = (starting-col,length,data-type,A/D)


DUMMY: Mainly u Source:
Question: 62) main()
char *str1="abcd";
char str2[]="abcd";
printf("%d %d %d",sizeof(str1),sizeof(str2),sizeof("abcd"));

Answer: Answer:
2 5 5
In first sizeof, str1 is a character pointer so it gives you the size of the pointer variable. In second sizeof the name str2 indicates the name of the array whose size is 5 (including the ' Source:
Question: What is a PROC? What is the difference between an instream and a catalogued PROC?

Answer: PROC stands for procedure. It is 'canned' JCL invoked by a PROC statement. An instream PROC is presented within the JCL; a catalogued PROC is referenced from a proclib partitioned dataset. Source:
Question: 56) What are the files which are automatically opened when a C file is executed?
stdin, stdout, stderr (standard input,standard output,standard error).

Answer: 57) what will be the position of the file marker?
a: fseek(ptr,0,SEEK_SET);
b: fseek(ptr,0,SEEK_CUR);

Answer :
a: The SEEK_SET sets the file position marker to the starting of the file.
b: The SEEK_CUR sets the file position marker to the current position
of the file.
Question: How you can delete a particular record from jcl? That is a file(PS) has 50 records, i need to delete the 5th record without any condition, how you will do it?

Answer: copy ps file to ksds file by using repro comand..its nothing but assining a index to the records using the index=4(initial=0) and delete comand in sysin we can delete the particular record no 5. Source:
Question: 102) void main()
int i=i++,j=j++,k=k++;

Answer: Answer:
Garbage values.
An identifier is available to use in program code from the point of its declaration.
So expressions such as i = i++ are valid statements. The i, j and k are automatic variables and so they contain some garbage value. Garbage in is garbage out (GIGO).

Question: 12. main()
int c=- -2;

Answer: Answer:
Here unary minus (or negation) operator is used twice. Same maths rules applies, ie. minus * minus= plus.
However you cannot give like --2. Because -- operator can only be applied to variables as a decrement operator (eg., i--). 2 is a constant and not a variable.
Question: 21. #define square(x) x*x
int i;
i = 64/square(4);

Answer: Answer:
the macro call square(4) will substituted by 4*4 so the expression becomes i = 64/4*4 . Since / and * has equal priority the expression will be evaluated as (64/4)*4 i.e. 16*4 = 64
Question: What is the advatage of coding RECFM=F over RECFM=FB.

I know the concept that RECFM=FB is fast, easily accessable due to the fact that FEW (not 1 records) records are allocated to each BLOCK. Then who would like to specify RECFM=F? And why?

Answer: Some old legacy packages/ programs had it. You may find it even now in old Cobol code as hard coded - you can't do anything without changing code and recompliling.

One of the reasons why F was needed - DA files (DA - Direct Access).

There are 2 or 3 types of them and the most popular one - REGIONAL1 had to have F format.

Nobody uses then anymore in application programming, but they are alive and well in some old tools/DBMS, like Datacom.

Question: 8. main()
char *p;
printf("%d %d ",sizeof(*p),sizeof(p));

Answer: Answer:
1 2
The sizeof() operator gives the number of bytes taken by its operand. P is a character pointer, which needs one byte for storing its value (a character). Hence sizeof(*p) gives a value of 1. Since it needs two bytes to store the address of the character pointer sizeof(p) gives 2.

33) main()
static char names[5][20]={"pascal","ada","cobol","fortran","perl"};
int i;
char *t;
for (i=0;i<=4;i++)

Answer: Answer:
Compiler error: Lvalue required in function main
Array names are pointer constants. So it cannot be modified.

Question: What is the difference between specifying DISP=OLD and DISP=SHR for a dataset?

Answer: DISP=OLD --> Exclusive HOLD. Read from beginning of dataset. But if u write, then it will overwrite on existing data. i.e old data is lost.

DISP=MOD --> Exclusive HOLD. You can write to the end of the file without loosing your old data (i.e append the data to the existing file).

DISP=SHR --> multiple user can share the data. Its read-only file.

With Regards to COBOL:

DISP=SHR and OPEN EXTEND in-file => will append the file at the end. Used mainly for lin Source:
Question: What does a disposition of (NEW,CATLG,KEEP) mean?

Answer: That this is a new dataset and needs to be allocated, to CATLG the dataset if the step is successful and to KEEP but not CATLG the dataset if the step abends. Thus if the step abends, the dataset would not be catalogued and we would need to supply the vol. ser the next time we refer to it. Source:
Question: What are SD37, SB37, SE37 abends?

Answer: All indicate dataset out of space. SD37 - no secondary allocation was specified. SB37 - end of vol. and no further volumes specified. SE37 - Max. of 16 extents already allocated. Source:
Question: What is COND=EVEN ?

Answer: Means execute this step even if any of the previous steps, terminated abnormally. Source:
Question: 39) main()
int i=0;

for(;i++;printf("%d",i)) ;

Answer: Answer:
before entering into the for loop the checking condition is "evaluated". Here it evaluates to 0 (false) and comes out of the loop, and i is incremented (note the semicolon after the for loop).

Question: 79) main()
char *p;
int *q;
long *r;

Answer: Answer:
++ operator when applied to pointers increments address according to their corresponding data-types.

Question: Explain concatenating datasets.

Answer: Concatenation is also used to append files in the JCL for a single ddname. The order of appending will be from top FILE to bottom FILE. And the order of the RECORDS concatenated, stays still. MERGing files differ from concatenation, in a way that it will also SORT after appending.

When you specify multiple dataset to be concatenated in Joblib or Steplib, the library with largest blocksize will be picked first.

You can concatenate upto 255 sequential files and 16 PDS files with a s Source:
Question: What is COND=ONLY ?

Answer: Means execute this step only if any of the previous steps, terminated abnormally. Source:

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