Answer Posted / steve holton
PDS directory blocks are 256 bytes long. The first halfword
(2 bytes) are used to indicate the number of bytes used in
the block, leaving 254 bytes for directory entries.
Directory entries are variable in size, and are each at
least 12 bytes long, and up to 74 bytes long (12 byte "base"
length plus up to 62 bytes user data).
Directory blocks may have no members, so 0 is the minimum
possible members in a block. If the question is re-worded to
something like "what is the minimum number of entries in a
FULL directory block?", the answer is floor(254/74) = 3.
That is, every PDS directory block is capable of holding AT
LEAST 3 entries.
Maximum possible entries in a full directory block would be
floor(254/12) = 21.
Is This Answer Correct ? | 3 Yes | 0 No |
Post New Answer View All Answers
What does a disposition of (MOD,DELETE,DELETE) mean ?
What are some jcl statements that are not allowed in procedures?
When you specify multiple datasets in a JOBLIB or STEPLIB, what factor determines the order?
What is the function of the steplib dd statement?
How can a fb file convert to vb file using sort program?
what are the various stages of job processing?
What is the function of a dd statement?
how do you access an uncataloged dataset in a jcl?
Is it possible to define dd statements as you want?
How would you understand error(execution phase)?
List the different components of jcl statement?
Differentiate between the joblib and the steplib statements?
A chkpt is the parameter coded for multi-volume qsam datasets in a dd statement. When a chkpt is coded as chkpt=eov, a checkpoint is written to the dataset specified in the sysckeov statement at the end of each volume of the input/output multi-volume dataset. State whether true or false?
What do you understand by the term “keyword” with respect to jcl and what is the opposite of the term?
What is the function of dd name parameter with a 2 part structure; audit.report?