In COBOL, the indexed file's key is often used to perform _____ operations on records.
- Access
- Arithmetic
- Sorting
- Update
In COBOL, the indexed file's key is frequently used to perform access operations on records. The key allows efficient retrieval and manipulation of records based on the specified criteria.
To perform integer division in COBOL, you can use the DIVIDE statement with the ________ phrase.
- BY
- GIVING
- INTO
- REMAINDER
The DIVIDE statement in COBOL is used for performing division operations. The GIVING phrase specifies the receiving field where the result of the division is stored. It is particularly useful for integer division.
How does the COBOL Procedure Division handle file I/O operations?
- COBOL does not support file I/O operations
- COBOL handles file I/O operations using the OPEN, READ, WRITE, and CLOSE statements in the Procedure Division
- COBOL uses a dedicated FILE CONTROL paragraph for file handling
- COBOL uses a separate FILE I/O Division for handling file operations
The COBOL Procedure Division handles file I/O operations using statements like OPEN, READ, WRITE, and CLOSE. These statements allow the programmer to interact with files, reading and writing data as needed within the procedural logic of the program.
When working with an OCCURS clause in COBOL, what does the INDEXED BY phrase allow you to do?
- Associate an index with an OCCURS clause to reference individual occurrences
- Define the initial value of an OCCURS clause
- Determine the data type of the OCCURS clause
- Specify the maximum number of occurrences in an OCCURS clause
The INDEXED BY phrase in COBOL allows you to associate an index with an OCCURS clause. This index can be used to reference individual occurrences within the array, enabling efficient access and manipulation of data.
To make a variable accessible across different programs in COBOL, you can use the _____ clause.
- EXPORT
- EXTERNAL
- GLOBAL-STORAGE
- LINKAGE
To make a variable accessible across different programs in COBOL, you can use the EXTERNAL clause. This allows variables to be shared between programs, enabling data interchange between them.
What are some advantages of using relative file processing over sequential file processing in COBOL?
- Dynamic sorting of records, automatic key generation, enhanced security features
- Faster record access, ability to insert and delete records randomly, supports direct access to records
- Sequential access with no random access, limited storage usage, suitable for small datasets
- Simple and easy to implement, lower storage requirements, suitable for large datasets
Relative file processing in COBOL offers advantages such as faster record access, the ability to insert and delete records randomly, and support for direct access to records based on relative record numbers. This makes it efficient for certain types of applications compared to sequential file processing.
To minimize disk I/O in COBOL, it's essential to use ____________ techniques for file access.
- Direct
- Indexed
- Relative
- Sequential
Indexed file access techniques in COBOL involve using indexes to locate and retrieve records directly, reducing the need for sequential searches. This minimizes disk I/O by providing a more efficient way to access specific records without scanning the entire file sequentially.
In COBOL, what mechanisms or techniques can be employed to optimize file locking strategies for high-performance multi-user systems?
- Implementing complex locking algorithms without considering transaction boundaries
- Implementing record-level locking, choosing appropriate lock modes, and using transaction management to minimize lock duration
- Locking only during write operations and not during read operations
- Using file-level locking for simplicity, avoiding locking altogether, relying on database management system locks
To optimize file locking in COBOL for high-performance multi-user systems, employ mechanisms like record-level locking, choose suitable lock modes, and use transaction management to minimize lock duration. This ensures efficient concurrency while maintaining data integrity.
The OCCURS clause in COBOL is used for defining ________ in the Data Division.
- Array elements
- External procedures
- Index variables
- Record layouts
The OCCURS clause in COBOL is used for defining arrays, allowing you to specify the number of occurrences of a data item within a group. It is particularly useful for handling repetitive data structures like arrays in other programming languages.
When should you use the OCCURS clause in defining data structures?
- To allocate space for a data item
- To create a loop for processing a group of related data items
- To define a record layout for a file
- To specify the hierarchy of a data item
The OCCURS clause in COBOL is used to create a loop for processing a group of related data items. It allows the repetition of a data item or a group of data items, facilitating the handling of arrays and tables in COBOL programs.