Cassandra Brass Tacks | Fresco Play
Question 1: Continuous uptime and low latency is achieved in NoSQL systems as compared to traditional relational databases.
Answer: Yes
Question 2: Which of the following statements about NoSQL databases is true?
Answer: Support unstructured data
Question 3: What is meant by 'Active everywhere design'?
Answer: All nodes can be written to and read from
Question 4: Which among the following is a NoSQL db?
Answer: All of the options mentioned
Question 5: Cassandra is not suitable for IoT applications.
Answer: False
Question 6: Cassandra is a __________ architecture.
Answer: peer-to-peer
Question 7: Which type of data model does Cassandra use?
Answer: Both key-value and tabular data models
Question 8: Which command can be used to list all available commands/operations in Cassandra?
Answer: HELP
Question 9: What are ‘seed nodes’ in Apache Cassandra?
Answer: All of the options mentioned
Question 10: A bloom filter can return __________.
Answer: A false positive
Question 11: Which Linux flavour can be used for Cassandra Installation?
Answer: All of the options mentioned
Question 12: Cluster can have multiple seed nodes.
Answer: True
Question 13: SSTable resides in memory.
Answer: False
Question 14: Java instance should be running in the machine inorder to setup Cassandra.
Answer: Yes, java must be running in the machine
Question 15: What is C-A-P, in CAP theorem?
Answer: 1) Consistency 2) Availability and 3) Partition tolerance
Question 16: What is the default partitioner in Apache Cassandra cluster?
Answer: Murmur3Partitioner
Question 17: Pick the correct statements.
Answer: All of the options mentioned
Question 18: Cassandra attaches a timestamp to each version of the record and uses this to merge records .
Answer: Yes
Question 19: The simplest and the fastest read path is when the record is present in the __________.
Answer: Row Cache
Question 20: Authorization capabilities for Cassandra use the familiar__________ security paradigm to manage object permissions.
Answer: GRANT
Question 21: Row cache is an in-memory cache, which stores recently read rows.
Answer: True
Question 22: To be able to read data from compressed blocks, Cassandra consults __________.
Answer: Compression offsets
Question 23: Keyspace is analogous to __________ in realtional world.
Answer: database
Question 24: Which among the following is not a Replica Placement strategy?
Answer: None of the options mentioned
Question 25: Is Timestamp an optional field in Column?
Answer: True
Question 26: Pick the correct statement.
Answer: Each keyspace has at least one and often many column families
Question 27: Which among the following is the right syntax for 'Using a Keyspace'?
Answer: USE
Question 28: Which of the following statements is true about CQL?
Answer: All of the options mentioned
Question 29: Defining a primary key is mandatory while creating a table.
Answer: True
Question 30: Which Linux flavour can be used for Cassandra Installation?
Answer: All of the options mentioned
Question 31: What is the primary language for communicating with the Apache Cassandraâ„¢ database?
Answer: CQL
Question 32: Pick the correct statement.
Answer: All of the options mentioned
Question 33: Which directory contains Cassandra configuration files?
Answer: conf
Question 34: Cassandra will keep appending the records into the Commit Log and then to the memtable.
Answer: True
Question 35: How does Murmur3Partitioner work?
Answer: Fast hash-based partitioner
Question 36: Partitioners supported by Cassandra are __________.
Answer: All of the options mentioned
Question 37: Which collection type in Cassandra is dictionary like object?
Answer: Map
Question 38: Which OS does Cassandra support?
Answer: Both Windows and Linux
Question 39: Protocol for communicating timeout info among nodes is __________.
Answer: NTP
Question 40: What can be used to monitor clock drifts?
Answer: NTP
Question 41: The process of turning a Memtable into a SSTable is called
Answer: Flushing
Question 42: What can also be attributed as wide-row in Apache Cassandra?
Answer: Compound Key
Question 43: What is the critical bottleneck faced during creation of data model?
Answer: Hot Spots
Question 44: User accounts may be altered and dropped using the __________ Query Language.
Answer: Cassandra
Question 45: Which among the following is not a performance measurement tool?
Answer: None
Question 46: Partitioned data in Cassandra can be looked up using __________.
Answer: Key-space
Question 47: Which technique is used for error correction for every compressed block?
Answer: CRC
Question 48: Each flush of the memtable results in the creation of __________.
Answer: Sstable
Question 49: A cluster is __________.
Answer: A collection of data centers
Question 50: Minimum JVM version required for Cassandra is __________.
Answer: 1.6
Question 51: Replication can be configured to work across __________.
Answer: one or more Data Centers
Question 52: In Cassandra, data is first written to __________.
Answer: Commit Log and Memtable
Question 53: What is the use of commit log?
Answer: Crash-recovery
Question 54: Primary key is a column that is used to uniquely identify a row.
Answer: True
Question 55: __________ is a collection of related nodes.
Answer: Data center
Question 56: In cassandra consistency is achieved through consistency tuning mechanisms.
Answer: True
Question 57: How does Cassandra store data?
Answer: By dividing all data evenly around a cluster of nodes, which can be visualized as a ring
Question 58: CQL features include __________.
Answer: All of the options mentioned
Question 59: Which of the statements are true?
Answer: All of the options mentioned
Question 60: Which of the following statements is true?
Answer: All of the options mentioned
Question 61: NoSQL db - Cassandra is of type __________.
Answer: Wide-column stores
Question 62: Which collection type is used to maintain uniqueness of data structure?
Answer: Set
Question 63: Cassandra supports ACID transactions?
Answer: False
Question 64: Cassandra promotes __________ operation.
Answer: Read-before-write
Question 65: Which of the following is not part of SSTable?
Answer: Memtable
Question 66: There are __________ types of read requests that a coordinator can send to a replica.
Answer: 3
Question 67: What percentage is the default threshold of memory used for flushing of the largest Memtables?
Answer: 65
Question 68: __________ can be configured per table for non-QUORUM consistency levels.
Answer: Read repair
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