Apex Fundamentals and Best Practices PLATFORM-DEVELOPER-II Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   Which exception class is specifically designed to catch errors that occur when a DML operation fails due to a database constraint, such as a required field missing or an invalid value?

   • ASystem.QueryException
   • BSystem.NullPointerException
   • CSystem.DmlException
   • DSystem.LimitException
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2. 7application · medium

   A developer needs to write a generic method that updates any sObject type passed in as a parameter. The method should not use a hard-coded object name. Which dynamic Apex feature should be used?

   • AType.forName to instantiate the object.
   • BDatabase.update with a List<SObject> parameter.
   • CDynamic SOQL with a query string built at runtime.
   • DSchema.describeSObjects to get the object's fields.
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4. 8foundation · easy

   A developer needs to insert a record of an sObject type that is only known at runtime. Which dynamic Apex feature should be used?

   • ADynamic SOSL
   • BDynamic DML
   • CSchema.describeSObjects
   • DDynamic SOQL
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5. 9foundation · easy

   Which technique is most effective for avoiding DML governor limit violations when updating a list of records?

   • APerforming a DML operation for each record individually
   • BUsing a savepoint before each DML operation
   • CAvoiding DML operations entirely
   • DUsing a single DML operation on a collection of records
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6. 10application · medium

   An Apex method performs several DML operations. After inserting Accounts, it updates Contacts, but the Contact update fails due to a validation rule. The developer wants to preserve the Account insert while rolling back only the Contact update. Which approach should be used?

   • AUse a savepoint before the Contact update and call Database.rollback(savepoint) in the catch block.
   • BCatch the exception and continue without any rollback.
   • CUse Database.update with the allOrNothing parameter set to false.
   • DWrap the entire method in a try-catch block and let the exception propagate.
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