Level-49 is a special data item level in COBOL that is reserved explicitly for defining condition names. A condition name is a symbolic representation of a particular condition or state of a data item. It is associated with a particular data item and can be used in conditional expressions, such as IF statements and EVALUATE statements, to control the flow of the program based on the condition’s status.
SEARCH and SEARCH ALL are powerful search functionalities in COBOL that allow developers to efficiently locate specific values within arrays or tables. By understanding the syntax and differences between these two statements, you can effectively implement search operations in your COBOL programs. Whether you’re working with sorted or unsorted data, COBOL’s search capabilities provide a valuable tool for processing business-oriented applications.
z/OS provides various dataset types to cater to different data storage and access requirements. Sequential datasets offer straightforward linear access, while partitioned datasets allow logical grouping of related members. VSAM datasets provide indexed or direct access capabilities, while temporary datasets offer temporary storage during program execution. GDGs provide version control and historical data retention capabilities.
0 (None): No sharing is allowed. The file can only be accessed by one program at a time.
1 (Read): Multiple programs can read the file simultaneously, but no program can write to it.
2 (Update): Multiple programs can read and write to the file simultaneously, but changes made by one program are not immediately visible to other programs.
3 (Exclusive): Only one program can access the file at a time, and no other program can read or write to it.
b) Share Level:
