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Google Cloud Certified Professional Cloud Database Engineer · Google Cloud
Hot Area / Sentence Completion
Select the appropriate option to complete the statement. Click Check Answer below to see the marked solution.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
I would go with D and E
https://cloud.google.com/spanner/docs/schema-design D because high cardinality means you have more unique values in the collumn. That's a good thing for a hot-spotting issue. E because Spanner specifically has this feature to reduce hot spotting. Basically, it generates unique values https://cloud.google.com/spanner/docs/schema-design#bit_reverse_primary_key
I agree with Hilab's comment below.