Which statement is true about the Persistent Memory Commit Accelerator?

Question

Options

• APersistent Memory Commit Accelerator tracks changes to Persistent Memory Data Accelerator to
• BPersistent Memory Commit Accelerator helps to further reduce redo log write latency by using
• CPersistent Memory Commit Accelerator copies redo log data from disk for faster redo apply on
• DPersistent Memory Commit Accelerator contains logging information from all tiers of the software
• EPersistent Memory Commit Accelerator reduces redo log write latency by using Persistent Memory

• A
  2% (1)
• B
  89% (59)
• D
  6% (4)
• E
  3% (2)

Explanation

Option B is correct because the Persistent Memory Commit Accelerator is specifically designed to further reduce redo log write latency - "further" is the key word, indicating it builds on an existing PMEM redo layer by adding an additional optimization layer that buffers redo data in persistent memory before it reaches the online redo log, accelerating the critical commit path.

Why the distractors are wrong:

• A is wrong because the Commit Accelerator does not "track changes" to the Data Accelerator - those are two separate features with distinct purposes; the Data Accelerator deals with data block I/O, not redo.
• C is wrong because copying redo data from disk describes a redo apply operation (e.g., standby/recovery scenarios), not a commit write acceleration feature.
• D is wrong because aggregating logging information "from all tiers" describes a diagnostic or observability tool, not a performance accelerator.
• E is a strong distractor but misses the "further" qualifier - option E describes the basic PMEM redo capability, while option B correctly captures that the Commit Accelerator provides an additional, layered reduction beyond that baseline.

Memory tip: Associate "Commit" → "redo log write" (every commit requires a redo write to be durable) → PMEM makes that write faster → the Commit Accelerator further accelerates it. The word "further" in option B is the distinguishing signal on the exam.

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