10+ NTT Data Salesforce Developer Interview Questions and Answers

APEX CPU Limit Exceeded error happens when code consumes too much CPU time. Best practices include optimizing code, reducing loops, and using asynchronous processing.

• Avoid using nested loops and optimize code for better performance

• Use asynchronous processing like @future or Queueable to offload CPU intensive tasks

• Limit the use of SOQL queries inside loops to reduce CPU consumption

SOQL query to fetch description field from Account and reason for inability to filter

• SOQL query: SELECT Description FROM Account

• Description field is not filterable because it is a long text field

• Long text fields cannot be filtered in SOQL queries

The @track decorator in Salesforce is used to track changes to a property in a Lightning web component.

• Used to make a property reactive and trigger re-renders when its value changes

• Not mandatory but recommended for properties that need to be reactive

• Use @track when you want changes to a property to be reflected in the UI

The code will output 'undefined' because variable 'a' is hoisted within the function.

• Variable 'a' is hoisted to the top of the function scope, so when 'console.log(a)' is called, 'a' is undefined.

• To fix this, move the declaration of 'var a=2;' above the 'console.log(a);' statement.

Yes, future methods can be called from a batch class in Salesforce.

• Future methods can be called from batch classes to perform asynchronous processing.

• This can be useful for offloading long-running tasks to future methods to avoid hitting governor limits.

• Example: Calling a future method from a batch class to update records in Salesforce asynchronously.

Mixed DML Exception occurs when DML operations are performed on setup and non-setup objects in a single transaction.

• Occurs when DML operations are performed on both setup and non-setup objects in a single transaction

• Setup objects include User, Profile, PermissionSet, etc.

• Non-setup objects include custom objects, standard objects like Account, Contact, etc.

Dynamic polymorphism is the ability of a single function or method to operate on different types of data.

• Allows a function to behave differently based on the object it is operating on

• Achieved through method overriding in object-oriented programming languages

• Enables code reusability and flexibility in software development

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 automation tools or custom web applications.

Visualforce is a framework that allows developers to build custom user interfaces for Salesforce applications.

• Visualforce uses a tag-based markup language similar to HTML.

• Developers can use Visualforce to create custom pages, components, and apps within Salesforce.

• Visualforce pages can include standard Salesforce components like fields, buttons, and links.

• Visualforce allows for dynamic content rendering based on user interactions or data.

• Visualforce can be used to create resp...read more