Madanswer Technologies Interview Questions Data|Agile|DevOPs|Python - Recent questions and answers in NoSQL

Answered: nosql database revolution questions and answers

Fri, 05 May 2023 17:50:05 +0000

What is NoSQL?

Answer: NoSQL stands for "not only SQL." It's a type of database that doesn't use a traditional relational data model.

Why was NoSQL created?

Answer: NoSQL was created to handle the challenges of big data, including the need for scalability, flexibility, and high performance.

What are some examples of NoSQL databases?

Answer: MongoDB, Cassandra, Couchbase, HBase, and DynamoDB are all examples of NoSQL databases.

What are the advantages of NoSQL databases?

Answer: NoSQL databases are highly scalable, flexible, and can handle large amounts of unstructured data. They also have low latency and high availability.

What are the disadvantages of NoSQL databases?

Answer: NoSQL databases can be more difficult to query and can lack some of the features of traditional relational databases, such as transactions.

What types of data are best suited for NoSQL databases?

Answer: NoSQL databases are best suited for unstructured or semi-structured data, such as documents, images, and videos.

What are the different types of NoSQL databases?

Answer: NoSQL databases can be categorized into four types: key-value stores, document stores, column-family stores, and graph databases.

What is a key-value store?

Answer: A key-value store is a NoSQL database that stores data as a collection of key-value pairs. Examples include Redis and Riak.

What is a document store?

Answer: A document store is a NoSQL database that stores data as documents, typically in JSON or BSON format. Examples include MongoDB and Couchbase.

What is a column-family store?

Answer: A column-family store is a NoSQL database that stores data as columns instead of rows. Examples include Cassandra and HBase.

What is a graph database?

Answer: A graph database is a NoSQL database that stores data in a graph structure, where nodes represent entities and edges represent relationships between them. Examples include Neo4j and OrientDB.

What is sharding in NoSQL databases?

Answer: Sharding is the process of dividing a large dataset into smaller parts and distributing them across multiple servers.

What is replication in NoSQL databases?

Answer: Replication is the process of copying data from one server to another to ensure redundancy and high availability.

What is CAP theorem in NoSQL databases?

Answer: CAP theorem states that a distributed system can only guarantee two out of three properties: consistency, availability, and partition tolerance.

How do NoSQL databases handle ACID transactions?

Answer: NoSQL databases often use a form of eventual consistency instead of full ACID compliance, allowing for greater scalability and availability.

How does data modeling differ in NoSQL databases compared to relational databases?

Answer: Data modeling in NoSQL databases is typically more flexible and can be based on the needs of the application rather than a predefined schema.

What is document-oriented modeling?

Answer: Document-oriented modeling is a type of data modeling used in document stores, where data is stored as documents rather than in tables with fixed schemas.

What is a schemaless database?

Answer: A schemaless database is a database that doesn't enforce a fixed schema, allowing for greater flexibility and adaptability.

What is a map-reduce operation?

Answer: Map-reduce is a data processing technique used in NoSQL databases to process large amounts of data in parallel.

What is the difference between NoSQL and SQL databases?

Answer: NoSQL databases are designed to handle unstructured or semi-structured data, while SQL databases are designed for structured data.

What is denormalization in NoSQL databases?

Answer: Denormalization is the process of adding redundant data to a NoSQL database to improve query performance.

What is indexing in NoSQL databases?

Answer: Indexing is the process of creating data structures that allow for fast searching and querying of data in a NoSQL database.

What is a distributed database?

Answer: A distributed database is a database that is spread across multiple servers or nodes.

How does a distributed database differ from a traditional database?

Answer: A distributed database allows for better scalability, availability, and fault tolerance compared to a traditional database.

What is a document-oriented database?

Answer: A document-oriented database is a type of NoSQL database that stores data as documents.

What is a graph database?

Answer: A graph database is a type of NoSQL database that stores data in a graph structure.

What is a column-family database?

Answer: A column-family database is a type of NoSQL database that stores data in a column-oriented fashion.

What is the purpose of a NoSQL database?

Answer: NoSQL databases are designed to handle big data and provide better scalability, flexibility, and performance compared to traditional databases.

How does NoSQL handle data consistency?

Answer: NoSQL databases often use eventual consistency instead of strict consistency to ensure high availability and scalability.

What is the difference between horizontal and vertical scaling?

Answer: Horizontal scaling involves adding more servers to handle increased load, while vertical scaling involves adding more resources to a single server.

What is the role of a distributed cache in NoSQL databases?

Answer: A distributed cache can be used in NoSQL databases to improve query performance and reduce the load on the database.

What is ACID compliance?

Answer: ACID compliance refers to a set of properties that ensure reliable data processing and storage, including atomicity, consistency, isolation, and durability.

How does eventual consistency work in NoSQL databases?

Answer: Eventual consistency allows for updates to propagate to all nodes in a distributed system over time, rather than enforcing strict consistency at all times.

What is the difference between a document and a row in a NoSQL database?

Answer: A document is a self-contained unit of data, typically stored as a JSON or BSON object, while a row is a unit of data in a table with a fixed schema.

What is the role of sharding in NoSQL databases?

Answer: Sharding allows for better scalability by distributing data across multiple servers.

What is the role of replication in NoSQL databases?

Answer: Replication ensures high availability and fault tolerance by copying data to multiple servers.

What is the difference between a primary key and a partition key in NoSQL databases?

Answer: A primary key uniquely identifies a record in a database, while a partition key is used to partition data across multiple servers.

What is a NoSQL data warehouse?

Answer: A NoSQL data warehouse is a type of database used for storing and analyzing large amounts of data.

What is the role of caching in NoSQL databases?

Answer: Caching can be used to improve query performance and reduce the load on the database by storing frequently accessed data in memory.

What is the difference between a distributed database and a federated database?

Answer: A distributed database is a single database spread across multiple servers, while a federated database is a collection of databases that appear as a single database.

What is the role of indexes in NoSQL databases?

Answer: Indexes allow for fast searching and querying of data in a NoSQL database.

Answered: Top 50+ NoSQL Skill Assessment Quiz 2022

Thu, 18 Aug 2022 00:16:19 +0000

Q1. Which types of indexes are available in Cosmos DB?

a. range and spatial

b. secondary and primary key

c. secondary and spatial

d. range and primary key

Correct Answer is: - range and spatial

Q2. You want to connect a DynamoDB stream to AWS Lambda function?

a. DynamoDB table

b. DynamoDB trigger

c. DynamoDB item

d. DynamoDB index

Answer: - DynamoDB trigger

Q3. To index a field that holds an array value in MongoDB, which index type do you create?

a. partial

b. sparse

c. compound

d. multikey

Answer: - multikey

Q4. You want to test HBASE on your laptop using the fewest number of steps. What do you do?

a. Set up Hadoop in pseudo-distributed mode.

b. Set up HBASE in local mode.

c. Set up HBASE in pseudo-distributed mode.

d. Set up Hadoop in local mode.

Answer:- Set up HBASE in pseudo-distributed mode.

Q5. You need to create a document database that supports database triggers. Which NoSQL database should you use?

a. DynamoDB

b. BigTable

c. Redis

d. MongoDB

Answer:- DynamoDB

Q6. What is recommended size for Redis keys?

a. medium

b. short

c. single bit

d. long

Answer:- short

Q7. What does redis use to sort the elements of a sorted set?

a. Scores.

b. Ids.

c. Values.

d. Keys.

Answer:- Keys

Q8. You need to change the shard key of an existing MongoDB collection. What do you do?

a. Dump the collection data, drop the collection, create a new collection and shard key, import the data.

b. Add second shard key and drop the first shard key.

c. Dump the collection data, drop the collection, presplit the data, create a new collection and shard key, import the data.

d. Drop and recreate the shard key.

Answer:- Dump the collection data, drop the collection, presplit the data, create a new collection and shard key, import the data.

Q9. Polyglot storage means using multiple types of what in the same application?

a. Security systems.

b. Database systems.

c. Storage systems.

d. Query systems.

Answer:- Query systems.

Q10. You need to implement the simplest possible scalable, in-memory cache for your AWS application. Which service do you select?

a. Elasticache using Memcached.

b. DynamoDB.

c. DynamoDB Accelerator (DAX).

d. Elasticache using Redis.

Answer:- Elasticache using Redis.

Q11. You are doing data modelling for Google BigTable. Which statement expresses if and when you should split entities across multiple rows?

a. Keep all information for an entity in a single row. Store related entities in adjacent rows.

b. Keep all information for an entity in a single row.

c. Split entities across multiple rows if the entity data is over thousands of MBs, or if it does not need atomic updates and reads.

d. Split entities across multiple rows if the entity data is over hundreds of MBs, or if it does not need atomic updates and reads.

Answer:- Split entities across multiple rows if the entity data is over hundreds of MBs, or if it does not need atomic updates and reads.

Q12. Which two characteristics define Amazon Quantum Ledger Database?

a. Key-value data model; transactionally consistent with ACID semantics.

b. Document data model; transactionally consistent with ACID semantics.

c. Key-value data model; transactions with tunable consistency.

d. Document data model; transactions with tunable consistency.

Answer:- Document data model; transactionally consistent with ACID semantics.

Q13. You need to design the primary key for DynamoDB based on three attributes. What do you do?

a. Designate all three fields as the primary key.

b. Concatenate all three fields into one new field, then designate that new field as the primary key.

c. Designate two fields of the three fields as the primary key.

d. Concatenate two fields into one new field, then designate that new field and the remaining field as the primary key.

Answer:- Concatenate all three fields into one new field, then designate that new field as the primary key.

Q14. Which of these data types should you avoid in designing a Google Bigtable row key?

a. multi-valued identifiers

b. string identifiers

c. timesstamps

d. frequently updated identifiers

Answer:- frequently updated identifiers

Q15. Your startup is building a prototype that has an evolving schema. Your data will be eventually consistent. Your application is hosted in AWS. Which databse do you choose?

a. Neptune

b. DocumentDB

c. DynamoDB

d. Amazon Aurora

Answer:- DynamoDB

Q16. You need to create a scalable database that allows you to share documents across authorized mobile clients in real time. What Google NoSQL database should you use?

a. Memorystore

b. Datastore

c. Firebase

d. Bigtable

Answer:- Firebase

Q17. You want to test HBase on your laptop using the fewest number of steps. What do you do?

a. Set up HBase in local mode.

b. Set up Hadoop in pseudo-distributed mode.

c. Set up HBase in pseudo-distributed mode.

d. Set up Hadoop in local mode.

Answer:- Set up Hadoop in local mode.

Q18. You need to design security for DynamoDB to allow users read-only access to certain items and attributes in a table. What do you do?

a. Use IAM roles.

b. Use IAM policy conditions.

c. Use a VPC endpoint.

d. Use IAM policies.

Answer:- Use IAM policy conditions.

Q19. What does Redis use to sort the elements of a sorted set?

a. keys

b. values

c. scores

d. ids

Answer:- scores

Q20. Which statement is preferred Cypher code for Neo4j?

a. MATCH (:Person)-->(:Card)-->(:Company) RETURN count(vehicle)

b. Match (:Person)-->(:Car):(vehicle:Car)-->(:Company) RETURN count(vehicle)

c. MATCH (:Person)-->(vehicle:Car)-->(:Company) RETURN count(vehicle)

d. MATCH (:Person)-->(:Card), (vehicle:Car)-->(:Company) RETURN count(vehicle)

Answer:- MATCH (:Person)-->(vehicle:Car)-->(:Company) RETURN count(vehicle)

Q21. You need multi-item ACID transactions with snapshot isolation within a partition for your cloud-based application. Which NoSQL databse do you choose?

a. Bigtable

b. GraphDB

c. DynamoDB

d. Cosmos DB

Answer:- Cosmos DB

Q22. You need to control your application's batch updates destination for your Bigtable multimode cluster. Which action do you take?

a. Create a custom app profile to route batch updates.

b. Create a custom app profile to route the batch update from that client.

c. Update the default app profile to route the natch update from that client.

d. Use the default app profile to route batch updates.

Answer:- Update the default app profile to route the natch update from that client.

Q23. Polyglot storage mean using multiple types of what in the same application?

a. security systems

b. database systems

c. query systems

d. storage systems

Answer:- storage systems

Q24. Your query to verify that your Redis key is configured to support expiring user information on a defined interval returns -2, What does this value indicate?

a. The queried key value expired in the last two seconds.

b. The queried key value exists, but has no associated expire value.

c. The queried key value does not exist.

d. There are two expired keys with this value.

Answer: The queried key value does not exist.

Q25. You are designing a MongoDB schema to support queries that will include lookups. What should you do?

a. Create an index on the key value used as the primary key.

b. Create an index on the key value used as the foreign key.

c. Create a multicolumn index on the key value used as the foreign key and the most unique column in the document.

d. Create a multicolumn index on the key value used as the primary and also the forign key.

Answer:- Create a multicolumn index on the key value used as the foreign key and the most unique column in the document.

Q26. What is the aggregation operator for a join concept in MongoDB?

a. $group

b. $match

c. $lookup

d. $project

Answer:- $lookup

Q27. For your mobile application, you need to select a Google cloud databse that can support compound, filtered document queries. Which do you choose?

a. Cloud SQL

b. Cloud Spanner

c. Cloud Firestore

d. Cloud Firebase

Answer:- Cloud Firestore

Q28. To bulk load data into Amazon Neputn, what do you do?

a. Upload data to S3 VPC endpoint, Use the Neptun loader to load from s3 into your Neptune instance

b. Ad data to a Kinesis stream, and use the Neptune loade to load from S# into your Neptun instance.

c. Add data to a Kisnesis stream, and create a Kinesis stream VPC endpoint. Use the Nepune loader to load from S3into your Neptune instance.

d. Upload data to S Use the neptune loader to load from S3 into your Neptune instance.

Answer:- Upload data to S3 VPC endpoint, Use the Neptun loader to load from s3 into your Neptune instance

Q29. You need to create a pub/sub server. Which databse do you use?

a. Neo4j

b. Cassandra

c. Redis

d. MyS#### QL

Answer:- Redis

Q30. You want to connect a DynamoDB stream to an AWS lambda function. Which one of these object do you create.

a. DynamoDB table

b. DynamoDB trigger

c. DynamoDB item

d. DynamoDB index

Answer:- DynamoDB trigger

Q31. Which two types of indexes are available in Cosmos DB?

a. secondary and primary key

b. secondary and spatial

c. range and spatial

d. range and primary key

Answer:- secondary and primary key

Q32. SQL databases and NoSQL are which types of scalable?

a. horizontally, infinitely

b. vertically, horizontally

c. vertically, infinitely

d. horizontally, vertically

Answer:- vertically, horizontally

Q33. You need to create a scalable database that allows you to query data nodes and edges efficiently. What do you use?

a. a relational database

b. a columnstore database

c. a document database

d. a graph database

Answer:- a graph database

Q34. You are developing a model for a graph database. Your data will be moved from a relational database into Neo4j. Which of these transformations apply?

a. Rows become labels: bales become nodes.

b. Tables become labels: rows become nodes.

c. Tables become collections: rows become items.

d. Rows become collections: tables become items.

Answer:- Tables become labels: rows become nodes.

Q35. You need to execute a command for MongoDB that does NOT load values from the .mongorc.js file. What do you do ?

a. Delete the .monorc.js file and restart mongo shell.

b. Use the mongo shell to create a command with --norc option

c. Rem all lines in the .mongorc.js file ad restart mongo shell.

d. Use the mongo shell to create a command with --nodedefault option.

Answer:- Use the mongo shell to create a command with --nodedefault option.

Q36. What is the recommended size for Redis keys?

a. long

b. short

c. medium

d. a single bit

Answer: - a single bit

Q37. You need to store an unordered collection of name-value pairs with differing data types in DynamoDB. Which data type should you choose?

a. map

b. set

c. list

d. stack

Answer: - map

Q38. Which statement retrieves an item from the MusicCollection table in DynamoDB?

a. aws dynamodb query --table-name MusicCollection --key file://key.json

b. aws dynamodb get-item --table-name MusicCollection --key file://key.json

c. aws dynamodb select --table-name MusicCollection --key file://key.json

d. aws dynamodb put-item --table-name MusicCollection --key file://key.json

Answer: - aws dynamodb get-item --table-name MusicCollection --key file://key.json

Q39. Database availability is measured by which metric?

a. the amount of service calls

b. the number of minutes

c. the amount of service costs

d. the number of nines

Answer:- the number of nines

Q40. You need to encrypt data at rest in DynamoDB. Which action do you take?

a. You assign a default AWS encryption key to your table to encrypt data.

b. You create an AWS encryption key and assign it to your table to encrypt data.

c. None. Data is encrypted by default.

d. You create an AWS encryption key and assign it to your database to encrypt data.

Answer: - None. Data is encrypted by default.

Q41. You need to generate a unique, sequential identifier for each value stored in a Redis cluster. What do you do?

A. Implement a SortedSet object to generate a value.

B. Use the GUID keyword to generate a value.

C. Implement a List object to generate a value.

D. Use the INCR keyword to generate a value

Answer: - Use the INCR keyword to generate a value

Q42. You want to return a list of all elements in two Redis sets. Which keyword do you use?

a. smembers

b. returnall

c. sunion

d. sismember

Answer: - smembers

Q43. Which method shows you whether MongoDB uses any indexes when running a query, and how the indexes are used?

a. detailQueryExecution()

b. showPlan()

c. explain()

d. describe()

Answer:- explain()

Q44. Which statement accurately describes global secondary indexes in DynamoDB?

a. The global secondary indexes in DynamoDB are consistent, and are not guaranteed to return correct results.

b. The global secondary indexes in DynamoDB are transactionally consistent, and are guaranteed to return correct results.

c. The global secondary indexes in DynamoDB are partially consistent, and are not guaranteed to return correct results.

d. The global secondary indexes in DynamoDB are eventually consistent, and are not guaranteed to return correct results.

Answer:- The global secondary indexes in DynamoDB are eventually consistent, and are not guaranteed to return correct results.

Q45. Which command do you use to add a value to a Redis stream named mystream?

a. ADD mystream * sensor-id 1234 temperature 19.8 1518951480106-1

b. UPDATE mystream * sensor-id 1234 temperature 19.8 1518951480106-3

c. XADD mystream * sensor-id 1234 temperature 9.8 1518951480106-0

d. INSERT mystream * sensor-d 1234 temperature 19.8 15181480106-2

Answer:- XADD mystream * sensor-id 1234 temperature 9.8 1518951480106-0

Q46. Which code example completes this statement and creates an index for a MongoDB object named restaurants, sorted ascending by the field name?

var indexCollection = function(db) {return co(function*() {...});};

a. const results = yield db.table('restaurants').createIndex({"name": 1}, null); return results;

b. const results = yield db.collection('restaurants').createIndex({"name": 0}, null); return results;

c. const results = yield db.collection('restaurants').createIndex({"name": 1}, null); return results;

d. const results = yield db.table('restaurants').createIndex({"name": 0}, null); return results;

Answer:- const results = yield db.collection('restaurants').createIndex({"name": 1}, null); return results;

Q47. Which Cypher code executes the multiquery block?

a. [ ]

MATCH (c:Company {name: 'Neo4j'}) RETURN c, MATCH (p:Person) WHERE p.name = 'Jennifer' RETURN p,

MATCH (t:Technology)-[:LIKES]-(a:Person {name: 'Jennifer'}) RETURN t.type;

b. [ ]

MATCH (c:Company {name: 'Neo4j'}) RETURN c, MATCH (p:Person) WHERE p.name = 'Jennifer' RETURN p,

MATCH (t:Technology)-[:LIKES]-(a:Person {name: 'Jennifer'}) RETURN t.type

c. [ ]

MATCH (c:Company {name: 'Neo4j'}) RETURN c AND MATCH (p:Person) WHERE p.name = 'Jennifer' RETURN p,

AND MATCH (t:Technology)-[:LIKES]-(a:Person {name: 'Jennifer'}) RETURN t.type;

d. [ ]

MATCH (c:Company {name: 'Neo4j'}) RETURN c;MATCH (p:Person) WHERE p.name = 'Jennifer' RETURN p;

MATCH (t:Technology)-[:LIKES]-(a:Person {name: 'Jennifer'}) RETURN t.type;

Answer:-

Q48. You need to create a scalable database that supports immutable writes. What do you use?

a. A ledger database

b. A graph database

c. A key-value database

d. A columnstore database

Answer: - A ledger database

Q49. You need to create a data store for the catalog for your new ecommerce application. Your company is a startup, so the catalog schema may evolve. Which do you choose?

a. Neo4j

b. Redis

c. MySQL

d. MongoDB

Answer:- MongoDB

Q50. You need to select a NoSQL database for heavy aggregate query workloads. Which type do you choose?

a. graph

b. key-value

c. document

d. columnstore

Answer:- columnstore

Q51. You need to select a columnstore database that enforce built-in data types. You want to add indexes to improve performance for known workloads. Which do you choose?

a. Cassandra

b. Bigtable

c. Redis

d. HBase

Answer:- Redis

Q52. In DynamoDB, the partition key and sort key are also known as which type of attributes?

a. range, hash

b. primary, range

c. hash, range

d. range, secondary

Answer:- hash, range

Q53. What is a popular, open-source key-value store database?

a. MongoDB

b. Redis

c. MySQL

d. Cassandra

Answer:- Redis

Q54. You need to create a scalable database to store and query JSON data. What do you use?

a. relational DB

b. document DB

c. graph DB

d. ledger DB

Answer:- document DB

Answered: You need to encrypt data at rest in DynamoDB. Which action do you take?

Mon, 15 Aug 2022 22:23:42 +0000

You need to encrypt data at rest in DynamoDB. Which action do you take?

Answer: - None. Data is encrypted by default.

Answered: Database availability is measured by which metric?

Mon, 15 Aug 2022 22:22:48 +0000

Database availability is measured by which metric?

Answer:- the number of nines

Answered: Which statement retrieves an item from the MusicCollection table in DynamoDB?

Mon, 15 Aug 2022 22:21:59 +0000

Which statement retrieves an item from the MusicCollection table in DynamoDB?

Answer: - aws dynamodb get-item --table-name MusicCollection --key file://key.json

Answered: You need to store an unordered collection of name-value pairs with differing data types in DynamoDB. Which data type should you choose?

Mon, 15 Aug 2022 22:20:57 +0000

You need to store an unordered collection of name-value pairs with differing data types in DynamoDB. Which data type should you choose?

Answer: - map

Answered: What is the recommended size for Redis keys?

Mon, 15 Aug 2022 22:20:10 +0000

What is the recommended size for Redis keys?

Answer: - a single bit

Answered: You need to execute a command for MongoDB that does NOT load values from the .mongorc.js file. What do you do ?

Mon, 15 Aug 2022 22:19:21 +0000

You need to execute a command for MongoDB that does NOT load values from the .mongorc.js file. What do you do ?

Answer:- Use the mongo shell to create a command with --nodedefault option.

Answered: You are developing a model for a graph database. Your data will be moved from a relational database into Neo4j. Which of these transformations apply?

Mon, 15 Aug 2022 22:18:10 +0000

You are developing a model for a graph database. Your data will be moved from a relational database into Neo4j. Which of these transformations apply?

Answer:- Tables become labels: rows become nodes.

Answered: You need to create a scalable database that allows you to query data nodes and edges efficiently. What do you use?

Mon, 15 Aug 2022 22:17:16 +0000

You need to create a scalable database that allows you to query data nodes and edges efficiently. What do you use?

Answer:- a graph database

Answered: SQL databases and NoSQL are which types of scalable?

Mon, 15 Aug 2022 22:16:19 +0000

SQL databases and NoSQL are which types of scalable?

Answer:- vertically, horizontally

Answered: Which two types of indexes are available in Cosmos DB?

Mon, 15 Aug 2022 22:14:03 +0000

Which two types of indexes are available in Cosmos DB?

Answer:- secondary and primary key

Answered: You want to connect a DynamoDB stream to an AWS lambda function. Which one of these object do you create.

Mon, 15 Aug 2022 22:13:12 +0000

Answer:- DynamoDB trigger

Answered: You need to create a pub/sub server. Which databse do you use?

Mon, 15 Aug 2022 22:12:31 +0000

You need to create a pub/sub server. Which databse do you use?

Answer:- Redis

Answered: To bulk load data into Amazon Neputn, what do you do?

Mon, 15 Aug 2022 22:11:35 +0000

To bulk load data into Amazon Neputn, what do you do?

Answer:- Upload data to S3 VPC endpoint, Use the Neptun loader to load from s3 into your Neptune instance

Answered: For your mobile application, you need to select a Google cloud databse that can support compound, filtered document queries. Which do you choose?

Mon, 15 Aug 2022 22:10:36 +0000

For your mobile application, you need to select a Google cloud databse that can support compound, filtered document queries. Which do you choose?

Answer:- Cloud Firestore

Answered: What is the aggregation operator for a join concept in MongoDB?

Mon, 15 Aug 2022 22:09:11 +0000

What is the aggregation operator for a join concept in MongoDB?

Answer:- $lookup

Answered: You are designing a MongoDB schema to support queries that will include lookups. What should you do?

Mon, 15 Aug 2022 22:08:21 +0000

You are designing a MongoDB schema to support queries that will include lookups. What should you do?

Answer:- Create a multicolumn index on the key value used as the foreign key and the most unique column in the document.

Answered: Your query to verify that your Redis key is configured to support expiring user information on a defined interval returns -2, What does this value indicate?

Mon, 15 Aug 2022 22:06:14 +0000

Your query to verify that your Redis key is configured to support expiring user information on a defined interval returns -2, What does this value indicate?

Answer: The queried key value does not exist.

Answered: Polyglot storage mean using multiple types of what in the same application?

Mon, 15 Aug 2022 22:04:02 +0000

Polyglot storage mean using multiple types of what in the same application?

Answer:- storage systems

Answered: You need to control your application's batch updates destination for your Bigtable multimode cluster. Which action do you take?

Mon, 15 Aug 2022 22:01:31 +0000

You need to control your application's batch updates destination for your Bigtable multimode cluster. Which action do you take?

Answer:- Update the default app profile to route the natch update from that client.

Answered: You need multi-item ACID transactions with snapshot isolation within a partition for your cloud-based application. Which NoSQL databse do you choose?

Mon, 15 Aug 2022 22:00:23 +0000

You need multi-item ACID transactions with snapshot isolation within a partition for your cloud-based application. Which NoSQL databse do you choose?

a. Bigtable

b. GraphDB

c. DynamoDB

d. Cosmos DB

Answer:- Cosmos DB

Answered: Which statement is preferred Cypher code for Neo4j?

Sun, 14 Aug 2022 15:13:28 +0000

Which statement is preferred Cypher code for Neo4j?

Answer:- MATCH (:Person)-->(vehicle:Car)-->(:Company) RETURN count(vehicle)

Answered: What does Redis use to sort the elements of a sorted set?

Sun, 14 Aug 2022 15:12:37 +0000

What does Redis use to sort the elements of a sorted set?

Answer:- scores

Answered: You need to design security for DynamoDB to allow users read-only access to certain items and attributes in a table. What do you do?

Sun, 14 Aug 2022 15:11:55 +0000

You need to design security for DynamoDB to allow users read-only access to certain items and attributes in a table. What do you do?

Answer:- Use IAM policy conditions.

Answered: You want to test HBase on your laptop using the fewest number of steps. What do you do?

Sun, 14 Aug 2022 15:11:06 +0000

You want to test HBase on your laptop using the fewest number of steps. What do you do?

Answer:- Set up Hadoop in local mode.

Answered: You need to create a scalable database that allows you to share documents across authorized mobile clients in real time. What Google NoSQL database should you use?

Sun, 14 Aug 2022 15:10:05 +0000

You need to create a scalable database that allows you to share documents across authorized mobile clients in real time. What Google NoSQL database should you use?

Answer:- Firebase

Answered: Your startup is building a prototype that has an evolving schema. Your data will be eventually consistent. Your application is hosted in AWS. Which databse do you choose?

Sun, 14 Aug 2022 15:09:18 +0000

Your startup is building a prototype that has an evolving schema. Your data will be eventually consistent. Your application is hosted in AWS. Which databse do you choose?

Answer:- DynamoDB

Answered: Which of these data types should you avoid in designing a Google Bigtable row key?

Sun, 14 Aug 2022 15:08:12 +0000

Which of these data types should you avoid in designing a Google Bigtable row key?

Answer:- frequently updated identifiers

Answered: You need to design the primary key for DynamoDB based on three attributes. What do you do?

Sun, 14 Aug 2022 15:07:23 +0000

You need to design the primary key for DynamoDB based on three attributes. What do you do?

Answer:- Concatenate all three fields into one new field, then designate that new field as the primary key.

Answered: Which two characteristics define Amazon Quantum Ledger Database?

Sun, 14 Aug 2022 15:06:27 +0000

Which two characteristics define Amazon Quantum Ledger Database?

Answer:- Document data model; transactionally consistent with ACID semantics.

Answered: You are doing data modelling for Google BigTable. Which statement expresses if and when you should split entities across multiple rows?

Sun, 14 Aug 2022 15:05:39 +0000

You are doing data modelling for Google BigTable. Which statement expresses if and when you should split entities across multiple rows?

Answer:- Split entities across multiple rows if the entity data is over hundreds of MBs, or if it does not need atomic updates and reads.

Answered: You need to implement the simplest possible scalable, in-memory cache for your AWS application. Which service do you select?

Sun, 14 Aug 2022 15:04:46 +0000

You need to implement the simplest possible scalable, in-memory cache for your AWS application. Which service do you select?

Answer:- Elasticache using Redis

Answered: Polyglot storage means using multiple types of what in the same application?

Sun, 14 Aug 2022 15:03:51 +0000

Polyglot storage means using multiple types of what in the same application?

Answer:- Query systems.

Answered: You need to change the shard key of an existing MongoDB collection. What do you do?

Sun, 14 Aug 2022 15:03:05 +0000

You need to change the shard key of an existing MongoDB collection. What do you do?

Answer:- Dump the collection data, drop the collection, presplit the data, create a new collection and shard key, import the data.

Answered: What does redis use to sort the elements of a sorted set?

Sun, 14 Aug 2022 15:01:55 +0000

What does redis use to sort the elements of a sorted set?

Answer:- Keys

Answered: What is recommended size for Redis keys?

Sun, 14 Aug 2022 15:01:04 +0000

What is recommended size for Redis keys?

Answer:- short

Answered: You need to create a document database that supports database triggers. Which NoSQL database should you use?

Sun, 14 Aug 2022 15:00:15 +0000

You need to create a document database that supports database triggers. Which NoSQL database should you use?

Answer:- DynamoDB

Answered: You want to test HBASE on your laptop using the fewest number of steps. What do you do?

Sun, 14 Aug 2022 14:59:11 +0000

You want to test HBASE on your laptop using the fewest number of steps. What do you do?

Answer:- Set up HBASE in pseudo-distributed mode.

Answered: To index a field that holds an array value in MongoDB, which index type do you create?

Sun, 14 Aug 2022 14:58:16 +0000

Answer: - multikey

Answered: You want to connect a DynamoDB stream to AWS Lambda function?

Sun, 14 Aug 2022 14:57:36 +0000

Answer: - DynamoDB trigger

Answered: Which types of indexes are available in Cosmos DB?

Sun, 14 Aug 2022 14:56:52 +0000

Correct Answer is: - range and spatial

Answered: nosql interview questions and answers pdf

Wed, 08 Sep 2021 04:08:04 +0000

https://madanswer.com/29741/nosql-database-revolution-questions-and-answers

Answered: nosql multiple choice questions and answers

Wed, 08 Sep 2021 04:07:58 +0000

https://madanswer.com/29741/nosql-database-revolution-questions-and-answers

Answered: Columnar databases are preferable for OLTP systems.

Tue, 26 Jan 2021 13:16:05 +0000

No, The above statement is wrong

So the answer is ii) False

Answered: Why NoSQL?

Wed, 21 Oct 2020 12:39:38 +0000

Relational Database Management Systems (RDBMS) is a powerful technology for storing structured data in web and business applications and is considered to be the forerunner of NoSQL.

Since the publication of Codds paper A relational model of data for large shared data banks in 1970, these data stores have been widely adopted and are often thought of as the only alternative for data storage accessible in a consistent way.

Drawbacks

What do you think is the reason for the emergence of NoSQL when we had RDBMS?

The following features of RDBMS will answer the question:

Scalability

Cost

🔗Reference : stackoverflow.com

🔗Source: Interview Questions and Answers

🔗Reference: Javatpoint.com

Answered: What is NoSQL?

Wed, 21 Oct 2020 12:39:18 +0000

NoSQL stands for Not Only SQL. It provides a way to store and retrieve the data that is stored in tabular format as in relational databases.

Introduced by Carl Strozzi in 1988, it was later reintroduced by Eric Evans.

It is a complementary addition to SQL and Relational databases.

These are flexible database management systems that provide a way to store and process both structured and semi-structured data.

🔗Reference : stackoverflow.com

🔗Source: Interview Questions and Answers

🔗Reference: Javatpoint.com

Answered: ____________ in Key-Value databases are similar to 'Tables' in RDBMS.

Mon, 27 Jul 2020 08:06:32 +0000

(3)Buckets in Key-Value databases are similar to 'Tables' in RDBMS.

Answered: In RDBMS, the attributes of an entity are stored in ____________

Mon, 27 Jul 2020 08:02:44 +0000

Ans is

Columns

NoSQL is a Relational data Model.

Mon, 27 Jul 2020 08:01:21 +0000

Q. NoSQL is a Relational data Model.
(1)True
(2)False