A Visualforce page loads slowly due to the large amount of data it displays. Which strategy can a developer use to improve the performance?

• A.Use the transient keyword for the List variables used in the custom controller.
• B.use Javascript to move data processing to the browser instead of the controller.
• C.use an <apex:actionPoller> in the page to load all of the data asynchronously.
• D.use lazy loading to load the data on demand, instead of in the controller's constructor.

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Universal Containers uses Big Objects to store almost a billion customer transactions called Customer_Transaction__b.
These are the fields on Customer_Transaction__b:
Account__c -
Program__c -
Points_Earned__c -
Location__c -
Transaction_Date__c -
The following fields have been identified as Index Fields for the Customer_Transaction__b object:
Account__c, Program__c, and Transaction_Date__c.
Which SOQL query is valid on the Customer_Transaction__b Big Object?

• A.SELECT Account__c, Program__c, Transaction_Date__c FROM Customer_Transaction__b WHERE Account__c = '001R000000302D3' AND Program__c ='Shoppers' AND Transaction_Date__c=2019-05-31T00:00Z
• B.SELECT Account__c, Program__c, Transaction_Date__c FROM Customer_Transaction__b WHERE Account__c = '001R000000302D3' AND Program__c LIKE 'Shop%' AND Transaction_Date__c=2019-05-31T00:00Z
• C.SELECT Account__c, Program__c, Transaction_Date__c FROM Customer_Transaction__b WHERE Account__c = '001R000000302D3' AND Program__c INCLUDES ('Shoppers', 'Womens') AND Transaction_Date__c=2019-05-31T00:00Z
• D.SELECT Account__c, Program__c, Transaction_Date__c FROM Customer_Transaction__b WHERE Account__c = '001R000000302D3' AND Program__c EXCLUDES ('Shoppers', 'Womens') AND Transaction_Date__c=2019-05-31T00:00Z

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A company represents their customers as Accounts in Salesforce. All customers have a unique Customer_Number__c that is unique across all of the company's systems. They also have a custom Invoice__c object, with a Lookup to Account, to represent invoices that are sent out from their external system.
This company wants to integrate invoice data back into Salesforce so Sales Reps can see when a customer is paying their bills on time.
What is the optimal way to implement this?

• A.Query the Account Object upon each call to insert invoice data to fetch the Salesforce ID corresponding to the Customer Number on the invoice.
• B.Ensure Customer_Number__c is an External ID and that a custom field Invoice_Number__c is an External ID and Upsert invoice data nightly.
• C.Create a cross-reference table in the custom invoicing system with the Salesforce Account ID of each Customer and insert invoice data nightly.
• D.Use Salesforce Connect and external data objects to seamlessly import the invoice data into Salesforce without custom code.

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Which of the following exceptions cannot be caught and will force an error? (Choose three.)

• A.LimitException
• B.AssertException
• C.SObjectExceptions
• D.DMLException
• E.License exceptions
• F.ListException

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A company notices that their unit tests in a test class with many methods to create many records for prerequisite reference data are slow.
What can a developer to do address the issue?

• A.Turn off triggers, flows, and validations when running tests.
• B.Move the prerequisite reference data setup to the constructor for the test class.
• C.Move the prerequisite reference data setup to a TestDataFactory and call that from each test method,
• D.Move the prerequisite reference data setup to a @testSetup method in the test class.

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