The main difference is If we use RECFM F then if the dataset is having the LRECL as 80 then the BLK size will also be 80. If we use RECFM FB then if the dataset LRECL is 80 then the BLK size we can take as multiples of 80 eg:80 800 8000...and so on
Please correct me if i am wrong Thanks & regards Haritha
The other 2 answers are correct. This one is questionable.
If you code with RECGM F Disadvantages: 1) The read and write operations will be slow.
Sequentially reading the entire file could be slower since an i/o would give less of the file. (ie more i/o although there are ways around this via chaining ccws etc.) Each individual i/o would actually be a bit faster since you would be using BSAM which I would bet will out perform QSAM on an individual i/o also the amount of data being transfered per read would be smaller.
2) It requires more buffer space also. Not really true. Buffers would be smaller.
Advantages: 1) The predecessor job can not see the blocked data. The data is not blocked - there is no blocked data
