Apply Fundamental Performance Optimization Techniques MB-500 Practice Questions (Page 8)

Questions 36–40

1. 36foundation · easy

   In X++ programming, what is the primary benefit of declaring variables with the narrowest possible scope?

   • AIt allows the variables to be used in multiple classes
   • BIt reduces memory usage and improves code clarity
   • CIt automatically caches the variable's value
   • DIt makes the variables accessible from other methods
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2. 37foundation · easy

   In Dynamics 365 Finance and Operations, which type of query is generally more efficient for performing operations on a large number of records?

   • ASet-based query
   • BCursor-based query
   • CLoop-based query
   • DRow-based query
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4. 38expert · hard

   A developer is building a service that provides configuration data to multiple users. The data is read frequently and changes rarely. The developer wants to cache the data to improve performance, but also wants to ensure that when the data changes, all users see the new data within a few minutes. The environment is a single AOS instance. What should the developer do?

   • AUse a temporary table and populate it on each user's session start.
   • BUse a singleton class with a static cache and refresh it every time the configuration is updated.
   • CUse the global cache and set a short expiration time, such as 5 minutes.
   • DUse a regular table and read the data on every request.
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5. 39foundation · easy

   In which scenario is a row-based query more appropriate than a set-based query in Dynamics 365 Finance and Operations?

   • AWhen processing a small number of records that require complex business logic per record
   • BWhen updating thousands of records with the same value
   • CWhen deleting all records that meet a condition
   • DWhen inserting records from another table
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6. 40application · medium

   A Dynamics 365 Finance and Operations developer is creating a utility class that provides a shared connection string for multiple batch jobs running on the same AOS. The connection string is read from a configuration table and is expensive to retrieve. The developer wants to ensure the connection string is retrieved only once per AOS process and shared across all batch jobs. What should the developer implement?

   • AA class that queries the configuration table in each batch job's main method and passes the connection string as a parameter
   • BA singleton class with a static method that lazily initializes a static variable holding the connection string
   • CA class that stores the connection string in a temporary table and reads it in each batch job
   • DA class that uses the AppGlobalCache to store the connection string with a 1-hour expiration
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