20+ DLF Interview Questions and Answers

obj open vs obj open by handle

• obj open opens a file and returns a file object

• obj open by handle opens a file using a file descriptor

• obj open by handle is faster than obj open

• obj open by handle is used when you already have a file descriptor

To change work object status of multiple cases from pending to closed.

• Identify the cases that need to be closed

• Update the status of each case to closed

• Save the changes made to the cases

• Use a loop to perform the above steps for multiple cases

• Example: Use a query to identify all cases with pending status and update their status to closed

I want to experience living in a different country and immersing myself in a new culture.

• Traveling to a foreign country and learning about their customs and traditions

• Trying new foods and experiencing different ways of life

• Making friends with locals and exploring the local attractions

Append to adds an element to a list while append to map adds a key-value pair to a map.

• Append to is used for lists while append to map is used for maps.

• Append to adds an element to the end of the list while append to map adds a key-value pair to the map.

• Append to map can also update the value of an existing key in the map.

Queue processor manages tasks in a queue while job scheduler schedules tasks based on time or event triggers.

• Queue processor manages tasks in a queue and processes them in a first-in, first-out (FIFO) order.

• Job scheduler schedules tasks based on time or event triggers, and can prioritize tasks based on their importance.

• Queue processor is typically used for real-time processing of tasks, while job scheduler is used for batch processing.

• Examples of queue processors include Rabb...read more

Blocked rules are carry forward to ensure consistency and prevent errors in future processing.

• Blocked rules are rules that have been prevented from executing due to certain conditions not being met.

• These rules are carried forward to ensure that they are not missed in future processing.

• This helps to maintain consistency and prevent errors in the system.

• For example, if a rule is blocked due to a missing data field, it will be carried forward until the missing field is filled in...read more

Relational DBMS stores data in tables with predefined relationships, while non-relational DBMS stores data in flexible, schema-less formats.

• Relational DBMS uses structured query language (SQL) for querying data

• Non-relational DBMS can store data in various formats like key-value pairs, document-based, graph databases

• Relational DBMS ensures data integrity through normalization and constraints

• Non-relational DBMS offers better scalability and flexibility for handling unstructured...read more

Class is a blueprint for creating objects, abstract class cannot be instantiated and can have abstract methods, interface is a contract for classes to implement certain methods.

• Class is a blueprint for creating objects with attributes and methods.

• Abstract class cannot be instantiated and can have abstract methods that must be implemented by subclasses.

• Interface is a contract for classes to implement certain methods, but does not provide any implementation.

Superclass data transform checkbox is used to inherit data transform rules from a parent class.

• When checked, the subclass will inherit the data transform rules from the superclass

• This can save time and effort in creating duplicate data transform rules

• Example: A superclass has a data transform rule to convert a date format, when the checkbox is checked in a subclass, it will also use the same rule

• This checkbox is available in Pega platform for software development

Privileges are permissions granted to users or processes to perform specific actions or access certain resources.

• Privileges are used to control access to sensitive data or critical system resources.

• They can be assigned to individual users or groups.

• Examples include read, write, execute, and delete permissions.

• Privileges can also be used to restrict access to certain functions or features within an application.

• Without proper privileges, users may not be able to perform necessa...read more

Binary search is a search algorithm that finds the position of a target value within a sorted array.

• Divide and conquer approach

• Compares target value with middle element of array

• If target value is smaller, search left half; if larger, search right half

• Repeat process until target value is found or subarray is empty

Closures in JavaScript are functions that have access to variables from their outer scope even after the outer function has finished executing.

• Closures allow for maintaining state in an asynchronous environment.

• They are created whenever a function is defined within another function.

• Closures can be used to create private variables and functions in JavaScript.

A linked list is a data structure consisting of nodes where each node contains a data field and a reference to the next node in the sequence.

• Linked list elements are not stored in contiguous memory locations like arrays.

• Each node in a linked list contains data and a reference to the next node.

• Linked lists can be singly linked (each node points to the next node) or doubly linked (each node points to both the next and previous nodes).

Find the next maximum element in an array of strings.

• Iterate through the array and keep track of the current maximum element.

• Compare each element with the current maximum and update if a larger element is found.

• Return the next maximum element after the current maximum.

Debouncing is a technique used to limit the rate at which a function is called.

• Use a timer to delay the execution of a function until a certain amount of time has passed without the function being called again.

• Reset the timer each time the function is called to prevent it from being executed multiple times in quick succession.

• Debouncing is commonly used in scenarios like handling button clicks to prevent multiple rapid clicks from triggering the function multiple times.