HARMAN Interview Questions, Process, and Tips

New and old are trigger context variables in Salesforce that store the new and old versions of a record being processed.

• New stores the updated version of the record being processed in a trigger.

• Old stores the previous version of the record being processed in a trigger.

• New and old are used to compare changes made to a record in a trigger.

• New and old are only available in before and after triggers, not in validation or w

No, using old methods for data update is not recommended.

• Old methods may not be compatible with new systems

• Old methods may not have the necessary security measures

• Using old methods can lead to data corruption or loss

SOQL is used to query records from a single object, while SOSL is used to search for records across multiple objects.

• SOQL is used to retrieve data from a single object based on conditions

• SOSL is used to search for data across multiple objects based on search terms

• SOQL supports aggregate functions, while SOSL does not

• SOQL is case-sensitive, while SOSL is not

• SOQL queries are limited to 100 records, while SOSL can return

Governor limits are limits enforced by Salesforce to ensure efficient use of shared resources.

• Governor limits are enforced on Apex code, SOQL queries, DML statements, and other operations.

• They prevent runaway code from monopolizing shared resources and causing performance issues.

• Examples of governor limits include limits on CPU time, heap size, and database queries.

• Developers must design their code to work within these...read more

To run an Apex class, we need to create an instance of the class and call its methods. Precautions include testing and avoiding governor limits.

• Create an instance of the class using the 'new' keyword

• Call the methods using dot notation

• Test the class thoroughly before deploying to production

• Avoid hitting governor limits by optimizing code and limiting queries

Lightning Data Service is a framework that allows developers to easily access and manipulate data in Salesforce.

• It provides a standard interface for data manipulation

• It automatically handles data caching and synchronization

• It supports CRUD operations on records and fields

• It can be used with Lightning Components and Apex controllers