15 Cassandra questions from the NoSQL bank, written for Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd.
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A.the part of the primary key that orders rows on disk within a single partition
B.a marker written to record that a value was deleted, so the removal propagates across replicas before compaction reclaims it
C.the configured number of nodes that keep a copy of each partition in a keyspace
D.a record whose columns can vary per row and can number in the millions under one partition
Answer + AI explanation with Pro
2. Which term means: "a record whose columns can vary per row and can number in the millions under one partition"?
Mid
A.Wide-column row
B.Replication factor
C.Tombstone
D.Clustering key
Answer + AI explanation with Pro
3. Which statement is correct?
Mid
A.Wide-column row — a marker written to record that a value was deleted, so the removal propagates across replicas before compaction reclaims it
B.Wide-column row — the configured number of nodes that keep a copy of each partition in a keyspace
C.Wide-column row — the write-optimized storage structure that buffers writes in memory and flushes sorted immutable files to disk
D.Wide-column row — a record whose columns can vary per row and can number in the millions under one partition
Answer + AI explanation with Pro
4. What is Clustering key?
Mid
A.the write-optimized storage structure that buffers writes in memory and flushes sorted immutable files to disk
B.the part of the primary key that orders rows on disk within a single partition
C.a record whose columns can vary per row and can number in the millions under one partition
D.a marker written to record that a value was deleted, so the removal propagates across replicas before compaction reclaims it
Answer + AI explanation with Pro
5. Which term means: "the part of the primary key that orders rows on disk within a single partition"?
Mid
A.LSM tree
B.Replication factor
C.Wide-column row
D.Clustering key
Answer + AI explanation with Pro
6. Which statement is correct?
Mid
A.Clustering key — a marker written to record that a value was deleted, so the removal propagates across replicas before compaction reclaims it
B.Clustering key — the write-optimized storage structure that buffers writes in memory and flushes sorted immutable files to disk
C.Clustering key — the configured number of nodes that keep a copy of each partition in a keyspace
D.Clustering key — the part of the primary key that orders rows on disk within a single partition
Answer + AI explanation with Pro
7. What is LSM tree?
Senior
A.the configured number of nodes that keep a copy of each partition in a keyspace
B.the write-optimized storage structure that buffers writes in memory and flushes sorted immutable files to disk
C.a record whose columns can vary per row and can number in the millions under one partition
D.a marker written to record that a value was deleted, so the removal propagates across replicas before compaction reclaims it
Answer + AI explanation with Pro
8. Which term means: "the write-optimized storage structure that buffers writes in memory and flushes sorted immutable files to disk"?
Senior
A.LSM tree
B.Clustering key
C.Replication factor
D.Wide-column row
Answer + AI explanation with Pro
9. Which statement is correct?
Senior
A.LSM tree — the write-optimized storage structure that buffers writes in memory and flushes sorted immutable files to disk
B.LSM tree — the configured number of nodes that keep a copy of each partition in a keyspace
C.LSM tree — a marker written to record that a value was deleted, so the removal propagates across replicas before compaction reclaims it
D.LSM tree — a record whose columns can vary per row and can number in the millions under one partition
Answer + AI explanation with Pro
10. What is Tombstone?
Senior
A.a record whose columns can vary per row and can number in the millions under one partition
B.the part of the primary key that orders rows on disk within a single partition
C.the configured number of nodes that keep a copy of each partition in a keyspace
D.a marker written to record that a value was deleted, so the removal propagates across replicas before compaction reclaims it
Answer + AI explanation with Pro
11. Which term means: "a marker written to record that a value was deleted, so the removal propagates across replicas before compaction reclaims it"?
Senior
A.Wide-column row
B.Tombstone
C.Clustering key
D.LSM tree
Answer + AI explanation with Pro
12. Which statement is correct?
Senior
A.Tombstone — a record whose columns can vary per row and can number in the millions under one partition
B.Tombstone — a marker written to record that a value was deleted, so the removal propagates across replicas before compaction reclaims it
C.Tombstone — the configured number of nodes that keep a copy of each partition in a keyspace
D.Tombstone — the write-optimized storage structure that buffers writes in memory and flushes sorted immutable files to disk
Answer + AI explanation with Pro
13. What is Replication factor?
Mid
A.the configured number of nodes that keep a copy of each partition in a keyspace
B.a marker written to record that a value was deleted, so the removal propagates across replicas before compaction reclaims it
C.a record whose columns can vary per row and can number in the millions under one partition
D.the write-optimized storage structure that buffers writes in memory and flushes sorted immutable files to disk
Answer + AI explanation with Pro
14. Which term means: "the configured number of nodes that keep a copy of each partition in a keyspace"?
Mid
A.Clustering key
B.Replication factor
C.Tombstone
D.Wide-column row
Answer + AI explanation with Pro
15. Which statement is correct?
Mid
A.Replication factor — a record whose columns can vary per row and can number in the millions under one partition
B.Replication factor — the write-optimized storage structure that buffers writes in memory and flushes sorted immutable files to disk
C.Replication factor — the configured number of nodes that keep a copy of each partition in a keyspace
D.Replication factor — a marker written to record that a value was deleted, so the removal propagates across replicas before compaction reclaims it
Answer + AI explanation with Pro
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