CHAR, NUMERIC and LOGICAL
The values stored in array don’t vary. In the other hand, we can store the different values in same variables at various stages.
If you try to read the locked record, we can get system defined message i. e. , the program will ended abnormally. With the help of File Information Data Structure we can handle record lock situation. Generally it will happen, when the same file of type ” U” used in different programs.