Which two characteristics of storage system cache improve application performance? (choose two.)

Question

Options

• AIt is read-only so writes do not have to be acknowledged.
• BIt has greater storage capacity than an HDD.
• CIt permits high priority data to be permanently resident.
• DIt provides faster access to data than an HDD.

• A
  5% (1)
• B
  5% (1)
• C
  91% (20)

Explanation

Cache boosts application performance because it can permanently pin high-priority data (C) - keeping critical datasets always resident so they are never evicted to slower media - and because its access speed vastly exceeds that of an HDD (D), with latency measured in microseconds versus milliseconds for spinning disks.

Option A is false because cache is not read-only - modern storage systems use write-back caching where writes land in cache first and are flushed to disk later, but the write still requires an acknowledgment from cache, and cache itself is fully read/write. Option B is false because cache has far less capacity than an HDD; its value lies in speed, not size - cache is expensive and small by design, holding only a hot subset of data.

Memory tip: Think of cache as a fast, small VIP shelf next to the librarian - VIP books stay on it permanently (C) and you grab them instantly instead of walking to the stacks (D). It's not bigger than the stacks (kills B), and you can write notes in the books too (kills A).

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