12 real Data Modeling questions from the Firebase bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.
1. What is Denormalization?
Junior
A.a search that spans every subcollection sharing the same name across the whole database, regardless of parent
B.the throughput problem caused by monotonically increasing keys or sequential timestamps concentrating writes on one storage range
C.the hard ceiling of about one megabyte per record, which pushes large or growing lists into subcollections
D.duplicating data across documents to avoid joins, trading storage and write complexity for fast single-read access
A.Document size limit — the hard ceiling of about one megabyte per record, which pushes large or growing lists into subcollections
B.Document size limit — a search that spans every subcollection sharing the same name across the whole database, regardless of parent
C.Document size limit — duplicating data across documents to avoid joins, trading storage and write complexity for fast single-read access
D.Document size limit — the throughput problem caused by monotonically increasing keys or sequential timestamps concentrating writes on one storage range
A.Collection group query — a search that spans every subcollection sharing the same name across the whole database, regardless of parent
B.Collection group query — the throughput problem caused by monotonically increasing keys or sequential timestamps concentrating writes on one storage range
C.Collection group query — the hard ceiling of about one megabyte per record, which pushes large or growing lists into subcollections
D.Collection group query — duplicating data across documents to avoid joins, trading storage and write complexity for fast single-read access
11. Which term means: "the throughput problem caused by monotonically increasing keys or sequential timestamps concentrating writes on one storage range"?
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