You are tasked with parsing and modifying a text field in a COBOL program. Which COBOL statement can help you achieve this?
- INSPECT statement
- PERFORM VARYING statement
- STRING statement
- UNSTRING statement
The UNSTRING statement in COBOL is used for parsing and extracting portions of a text field. It allows you to break down a text field into smaller components based on specified delimiters, enabling you to modify or manipulate the text as needed.
The OPEN verb in COBOL allows you to specify the ________ mode for a file.
- Access
- Organization
- Read
- Write
The OPEN verb in COBOL allows you to specify the Organization mode for a file. This determines how the records in the file are arranged, such as Sequential or Indexed.
When working with indexed files, how can you prevent the insertion of duplicate keys?
- Use the ADD verb before inserting a new record
- Specify the UNIQUE option in the FILE-CONTROL paragraph
- Include a CHECK verb to validate key uniqueness
- Utilize the OCCURS clause for key fields
To prevent the insertion of duplicate keys in COBOL indexed files, the UNIQUE option should be specified in the FILE-CONTROL paragraph of the program's data division. This ensures that each key value is unique within the indexed file.
The _____ clause in COBOL specifies the maximum number of records that can be in a relative file.
- LIMIT
- MAXIMUM
- OCCURS
- SIZE
In COBOL, the SIZE clause is used to specify the maximum number of records that can be present in a relative file. It helps in managing the size and capacity of the file for optimal performance.
In COBOL, what is the primary purpose of using VSAM and ISAM files?
- To enhance portability of COBOL programs
- To facilitate easy indexing of records
- To provide direct access to records based on key values
- To store only sequential data efficiently
The primary purpose of using VSAM (Virtual Storage Access Method) and ISAM (Indexed Sequential Access Method) files in COBOL is to provide direct access to records based on key values. This enables efficient retrieval and manipulation of specific records in a file.
The _____ clause in COBOL allows you to specify an alternative action to be taken when a file operation results in an exception.
- ALTERNATE RECORD
- EXCEPTION HANDLING
- EXCEPTION PROCEDURE
- INVALID KEY
In COBOL, the "INVALID KEY" clause is used to specify an alternative action to be taken when a file operation results in an exception. It provides a way to handle errors and take appropriate measures to ensure smooth program execution.
When using the MERGE statement, both input files must be _____ in ascending or descending order based on the merge criteria.
- INDEXED
- RANDOM
- SEQUENTIAL
- SORTED
When using the MERGE statement in COBOL, it is essential that both input files are sorted either in ascending or descending order based on the merge criteria. This ensures the effectiveness of the merging process.
When implementing error handling, what are the advantages of using the "HANDLE CONDITION" phrase?
- Avoids the need for error handling altogether
- Optimizes program performance
- Provides a centralized mechanism to handle multiple exceptions
- Simplifies the debugging process
The "HANDLE CONDITION" phrase in COBOL provides a centralized mechanism for handling multiple exceptions. It allows the program to define specific actions for different error conditions, improving code readability and maintainability.
How do you handle record updates and deletions in an indexed file system like VSAM using COBOL?
- Use the DELETE verb for record deletion and the WRITE verb for record updates.
- Use the READ verb with UPDATE option for record updates and DELETE for record deletions.
- Use the MODIFY statement for both record updates and deletions.
- Use the REWRITE verb for record updates and DELETE verb for record deletions.
In VSAM and other indexed file systems, the READ verb with UPDATE option is used for record updates, and DELETE verb is used for record deletions. The MODIFY statement is not used for direct updates or deletions in this context.
How can you efficiently remove duplicate records from a COBOL file while preserving data integrity?
- Ignoring duplicate records during file reading
- Implementing logic to skip duplicate records during file processing
- Using the COPY statement to create a file without duplicates
- Utilizing the DELETE statement in COBOL
To efficiently remove duplicate records from a COBOL file while preserving data integrity, you can implement logic within your program to skip duplicate records during file processing. This ensures that only unique records are considered, maintaining data integrity.