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📝 **Question:** You shard users by hash(user_id) across 8 nodes. Now you need to query 'all users in country=US created last week'. Why is this slow?
📋 Pick the right answer.
💡 **Hint:** Re-read the theory above if unsure.
🎯 Quiz
Question
📝 **Question:** You shard users by hash(user_id) across 8 nodes. Now you need to query 'all users in country=US created last week'. Why is this slow?
📋 Pick the right answer.
💡 **Hint:** Re-read the theory above if unsure.