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MLA-C02 practice question: Bedrock knowledge bases (1 of 2)

Deployment and Orchestration of ML and AI Workflows A free question from our original MLA-C02 practice exam. Try it, then open the answer to see why each option is right or wrong.

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A regional bank has an Amazon Bedrock knowledge base over its branch-policy documents, stored in an S3 data source. Staff updated several policy PDFs this morning, but the assistant still answers with last week's rules.

The bank wants the updated documents to be used for answers as soon as possible, without rebuilding the knowledge base or changing the documents' location.

What should the team do?

Choose one answer.

  1. A. Delete the knowledge base, create a new one with the same data source, and wait for the new index to finish building.
  2. B. Change the chunk size of the knowledge base, because applying a new chunking setting makes the service re-read and re-embed every document in the bucket.
  3. C. Start an ingestion job for the knowledge base data source, so that the changed S3 documents are re-processed and their vectors are updated.
  4. D. Copy the updated PDFs to a new S3 bucket, since the knowledge base reads from the newest bucket automatically.
Show the answer and explanation

Answer: C

  • A. Wrong: Recreating the knowledge base is slower and unnecessary for updated files. The stem asks for the updates to be picked up without rebuilding.
  • B. Wrong: Chunking settings control how documents are split when they are ingested, and changing them is not the way to pick up edited files. The documents are refreshed only when the data source is synced.
  • C. Right: Correct. A sync (ingestion job) is incremental, so Bedrock processes only the documents added, modified or deleted since the last sync and updates their embeddings. The knowledge base then answers from the new content. Learn more: Sync your data with your Amazon Bedrock knowledge base (opens in a new tab)
  • D. Wrong: The knowledge base reads only from its configured data source, so a new bucket is not read until it is configured. The stem asks to keep the location.

Explanation

Updated S3 documents reach a knowledge base through a sync, or ingestion job, which processes only the changed files and updates their vectors. Recreating the knowledge base, changing chunk settings or copying files to another bucket does not refresh the indexed content.

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