Best Practices and Performance B2C-COMMERCE-DEVELOPER Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A developer is reviewing a script that runs on a schedule to synchronize product data with an external ERP system. The script uses `dw.system.Logger` to log every product processed, which results in thousands of log entries per run. The script is slow and consumes significant resources. Which best practice violation is most evident?

   • AUsing a synchronous script instead of an asynchronous job.
   • BLogging at the debug level for every product.
   • CUsing the Logger class for logging.
   • DRunning the script on a schedule instead of on-demand.
   Reveal Solution Discussion Select an answer first
2. 17application · medium

   A developer is designing a process that generates a PDF report for a user and emails it to them. The report generation takes about 5 seconds. The user should receive the email within a few minutes. Which approach best follows scalability best practices?

   • ACache the PDF generation result and reuse it for all users.
   • BGenerate the PDF synchronously in the controller and email it before responding.
   • CGenerate the PDF in a background job that runs nightly.
   • DGenerate the PDF asynchronously using a queue and email it when complete.
   Reveal Solution Discussion Select an answer first
4. 18expert · hard

   A developer is designing a process that imports a large CSV file containing 500,000 product records. The import must be completed within 1 hour. The current implementation reads the entire file into memory and processes each record sequentially. The process is slow and often fails due to memory limits. Which approach best addresses both the memory and time constraints?

   • AUse a single database transaction to insert all records at once.
   • BRead the file in chunks and process each chunk in a separate asynchronous job.
   • COptimize the CSV parsing logic to be more efficient.
   • DIncrease the memory limit of the instance.
   Reveal Solution Discussion Select an answer first
5. 19application · medium

   A developer is optimizing a storefront search results page. The current implementation performs a product search, then for each product in the results, calls a service to retrieve inventory availability. The page takes 3 seconds to load. Which optimization technique would most effectively reduce the page load time?

   • AMove the inventory service call to a client-side AJAX request that runs after the page loads.
   • BIncrease the number of products displayed per page to reduce the number of search queries.
   • CBatch the inventory service calls into a single request that accepts multiple product IDs.
   • DCache the inventory availability data in a custom object with a short TTL, such as 5 minutes.
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6. 20application · medium

   A developer is optimizing a controller that displays a product's availability. The current code calls an external inventory service for every request. The inventory data changes at most every 15 minutes. Which optimization technique would most effectively reduce the number of external API calls?

   • AUse a session variable to store the inventory data.
   • BCache the inventory data in a custom object with a TTL of 15 minutes.
   • CUse a client-side AJAX call to fetch inventory after the page loads.
   • DIncrease the timeout of the inventory service call.
   Reveal Solution Discussion Select an answer first