Final exam question 2 index decrease insert throughput

I just cannot understand why this option is correct
The index only decrease the throughput of reads, but the amount of writes(insert) still depends on how much data it has.
Is there something wrong I get?

No. An index increase the speed of reading. Because, finding a specific document is much faster with an index.

However, an index decrease insert throughput because there is extra work to update the index from the new data.

I see,thank you.
This is a mistake with my grammar understanding. :joy:

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