Coforge DPA Pega Developer Interview Questions and Answers for Experienced

Lifecycle hooks in LWC are methods that allow developers to interact with the component at specific stages of its lifecycle.

• ConnectedCallback - called when a component is inserted into the DOM

• RenderedCallback - called after a component's template has been rendered

• DisconnectedCallback - called when a component is removed from the DOM

Aura components are used in Salesforce to build dynamic web applications with reusable components.

• Create interactive user interfaces

• Enhance user experience with dynamic content

• Enable communication between components

• Leverage event-driven architecture

• Support client-side controller logic

Connected apps in Salesforce allow external applications to integrate with Salesforce using APIs.

• Connected apps are created in Salesforce to establish a secure connection with external applications.

• They use OAuth protocol for authentication and authorization.

• Connected apps define the permissions and access levels for external applications.

• They can be used to integrate third-party applications, such as marketing automat

GIL stands for Global Interpreter Lock in Python, which limits execution of multiple threads at once.

• GIL is a mutex that protects access to Python objects, preventing multiple threads from executing Python bytecodes at once.

• Due to GIL, Python threads are not suitable for CPU-bound tasks but are still useful for I/O-bound tasks.

• To handle multi-threading in Python, one can use multiprocessing module or asynchronous progr...read more

React uses a virtual DOM to efficiently update the actual DOM based on changes in state or props.

• React creates a virtual DOM representation of the actual DOM.

• When state or props change, React compares the virtual DOM with the actual DOM to determine the minimal set of changes needed.

• React then updates the actual DOM efficiently to reflect the changes.

Procedures and functions are stored routines in a database that can be called to perform specific tasks.

• Procedures are a set of SQL statements that perform a specific task. They can have input and output parameters.

• Functions are similar to procedures but return a value. They can be used in SQL queries like any other function.

• Both procedures and functions can improve code reusability and maintainability in a database sy

A trigger is a special kind of stored procedure that is automatically executed when certain events occur in a database.

• Triggers are used to maintain data integrity by enforcing business rules or cascading changes.

• They can be set to execute before or after INSERT, UPDATE, or DELETE operations.

• Examples include auditing changes to a table, updating related records in other tables, or enforcing constraints.

A database is a structured collection of data that is stored and accessed electronically.

• Database organizes and stores data in tables

• It allows for efficient retrieval, insertion, and updating of data

• Examples include MySQL, Oracle, MongoDB

Primary key is a unique identifier for each record in a database table.

• Primary key ensures each record in a table is uniquely identified.

• It must have a unique value for each record.

• Primary key can be a single column or a combination of columns.

• Examples: ID column in a user table, combination of first name and last name in an employee table.

Design an airline service for booking flights and managing reservations.

• Create a user-friendly website or mobile app for customers to search and book flights.

• Implement a secure payment system for online bookings.

• Develop a system for managing flight schedules, seat availability, and reservations.

• Include features for customers to check-in online, select seats, and view flight status.

• Offer loyalty programs and discounts f