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Cassandra Brass Tacks Q&A

Continuous uptime and low latency is achieved in NoSQL systems as compared to traditional relational databases.
Yes — Correct

Which of the following statements about NoSQL databases is true?
Support unstructured data — Correct

What is meant by ‘Active everywhere design’?
All nodes can be written to and read from — Correct

Which among the following is a NoSQL db?
All of the options mentioned — Correct

Cassandra is not suitable for IoT applications.
False — Correct

Cassandra is a __ architecture.
peer-to-peer — Correct


Which type of data model does Cassandra use?
Both key-value and tabular data models — Correct

Which command can be used to list all available commands/operations in Cassandra?
HELP — Correct

What are ‘seed nodes’ in Apache Cassandra?
All of the options mentioned — Correct

A bloom filter can return __.
A false positive — Correct

Which Linux flavour can be used for Cassandra Installation?
All of the options mentioned — Correct

Cluster can have multiple seed nodes.
True — Correct

SSTable resides in memory.
False — Correct

Java instance should be running in the machine inorder to setup Cassandra.
Yes, java must be running in the machine — Correct


What is C-A-P, in CAP theorem?
1) Consistency 2) Availability and 3) Partition tolerance — Correct

What is the default partitioner in Apache Cassandra cluster?
Murmur3Partitioner — Correct

Pick the correct statements.
All of the options mentioned — Correct

Cassandra attaches a timestamp to each version of the record and uses this to merge records .
Yes — Correct

The simplest and the fastest read path is when the record is present in the __.
Row Cache — Correct

Authorization capabilities for Cassandra use the familiar__________ security paradigm to manage object permissions.
GRANT — Correct

Row cache is an in-memory cache, which stores recently read rows.
True — Correct

To be able to read data from compressed blocks, Cassandra consults __.
Compression offsets — Correct


Keyspace is analogous to __ in realtional world.
database — Correct

Which among the following is not a Replica Placement strategy?
None of the options mentioned — Correct

Is Timestamp an optional field in Column?
True — Correct

Pick the correct statement.
All the options mentioned — Correct
Each keyspace has at least one and often many column families. — Correct

Which among the following is the right syntax for ‘Using a Keyspace’?
USE — Correct


Which of the following statements is true about CQL?
All of the options mentioned — Correct

Defining a primary key is mandatory while creating a table.
True — Correct

Which Linux flavour can be used for Cassandra Installation?
All of the options mentioned — Correct

What is the primary language for communicating with the Apache Cassandra™ database?
CQL — Correct

Pick the correct statement.
All of the options mentioned — Correct

Which directory contains Cassandra configuration files?
conf — Correct


Cassandra will keep appending the records into the Commit Log and then to the memtable.
True — Correct

How does Murmur3Partitioner work?
Fast hash-based partitioner — Correct

Partitioners supported by Cassandra are __.
All of the options mentioned — Correct

Which collection type in Cassandra is dictionary like object?
Map — Correct

Which OS does Cassandra support?
Both Windows and Linux — Correct

Protocol for communicating timeout info among nodes is __.
NTP — Correct

What can be used to monitor clock drifts?
NTP — Correct

The process of turning a Memtable into a SSTable is called
Flushing — Correct

What can also be attributed as wide-row in Apache Cassandra?
Compound Key — Correct

What is the critical bottleneck faced during creation of data model?
Hot Spots — Correct

User accounts may be altered and dropped using the __ Query Language.
Cassandra — Correct

Which among the following is not a performance measurement tool?
None — correct

Partitioned data in Cassandra can be looked up using __.
Partition Key , Primary Key — Wrong

Which technique is used for error correction for every compressed block?
CRC — Correct

Each flush of the memtable results in the creation of __.
Sstable — Correct

A cluster is __.
A collection of data centers — Correct

Minimum JVM version required for Cassandra is __.
1.6 — Correct

Replication can be configured to work across __.
one or more Data Centers — Correct

In Cassandra, data is first written to __.
Commit Log and Memtable — Correct

What is the use of commit log?
Crash-recovery — Correct

Primary key is a column that is used to uniquely identify a row.
True — Correct

__ is a collection of related nodes.
Cluster , Ring — Wrong

In cassandra consistency is achieved through consistency tuning mechanisms.
True — Correct

How does Cassandra store data?
By dividing all data evenly around a cluster of nodes, which can be visualized as a ring. — Correct

CQL features include __.
All of the options mentioned — Correct

Which of the statements are true?
All of the options mentioned — Correct

Which of the following statements is true?
All of the options mentioned — Correct

NoSQL db – Cassandra is of type __.
Wide-column stores — Correct

Which collection type is used to maintain uniqueness of data structure?
Set — Correct

Cassandra supports ACID transactions?
False — Correct

Cassandra promotes __ operation.
Read-before-write — Correct

Which of the following is not part of SSTable?
Memtable — Correct

There are __ types of read requests that a coordinator can send to a replica.
3 — Correct

What percentage is the default threshold of memory used for flushing of the largest Memtables?
75 — Wrong

One Comment

  1. rahulrahul
    rahul

    please also involve handson over here

    26 December 2020 at 12:50 am Reply

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