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* added 4 new questions,  there were a repeat of two questions for question Q5 and question Q11, removed both of them and fixed the numbering

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- [ ] MongoDB
- [ ] Bigtable

#### Q24. You need to implement the simples possible scalable, in-memory cache for your AWS application. Which service do you select?
- [x] DynamoDb Accelerator (DAX)
- [ ] ElastiCache using memcached
- [ ] ElastiCache using Redis
- [ ] DynamoDB

#### Q25. Which statement is prefered Cypher code for Neo4j?
#### Q24. Which statement is prefered Cypher code for Neo4j?
- [ ] MATCH (:Person)-->(:Card)-->(:Company) RETURN count(vehicle)
- [ ] Match (:Person)-->(:Car):(vehicle:Car)-->(:Company) RETURN count(vehicle)
- [x] MATCH (:Person)-->(vehicle:Car)-->(:Company) RETURN count(vehicle)
- [ ] MATCH (:Person)-->(:Card), (vehicle:Car)-->(:Company) RETURN count(vehicle)

#### Q26. You need multi-item ACID transactions with snapshot isolation within a partition for your cloud-based application. Which NoSQL databse do you choose?
#### Q25. You need multi-item ACID transactions with snapshot isolation within a partition for your cloud-based application. Which NoSQL databse do you choose?
- [ ] Bigtable
- [ ] GraphDB
- [ ] DynamoDB
- [x] Cosmos DB

#### Q27. You need to control your application's batch updates destination for your Bigtable multinode cluster. Which action do you take?
#### Q26. You need to control your application's batch updates destination for your Bigtable multinode cluster. Which action do you take?
- [ ] Create a custom app profile to route batch updates.
- [ ] Create a custom app profile to route the batch update from that client.
- [x] Update the default app profile to route the natch update from that client.
- [ ] Use the default app profile to route batch updates.

#### Q29. Polyglot storage mean using multiple types of what in the same application?
#### Q27. Polyglot storage mean using multiple types of what in the same application?
- [ ] security systems
- [ ] databse systems
- [ ] query systems
- [x] storage systems

#### Q30. Your query to verify that your Redis key is configured to support expiring user information on a efined interval returns - - [ ] What does this value indicate?
#### Q28. Your query to verify that your Redis key is configured to support expiring user information on a efined interval returns - - [ ] What does this value indicate?
- [ ] The queried key value expired in the last two secodns.
- [ ] The queried key value exists, but has no associated expire value.
- [x] The queried key value does not exist.
- [ ] There are two expired keys with this value.

#### Q31. You are designing a MongoDB schema to support queries that will include lookups. What should you do?
#### Q29. You are designing a MongoDB schema to support queries that will include lookups. What should you do?
- [ ] Create an index on the key value used as the primary key.
- [ ] Create an index on the key value used as the foreign key.
- [x] Create a multicolumn index on the key value used as the foreign key and the most unique column in the document.
- [ ] Create a multicolumn index on the key value used as the primary and also the forign key.

#### Q32. What is the aggregation operator for a join concept in MongoDB?
#### Q30. What is the aggregation operator for a join concept in MongoDB?
- [ ] $group
- [ ] $match
- [x] $lookup
- [ ] $project

#### Q33. For your mobile application, you need to select a Google cloud databse that can support compound, filtered document queries. Which do you choose?
#### Q31. For your mobile application, you need to select a Google cloud databse that can support compound, filtered document queries. Which do you choose?
- [ ] Cloud SQL
- [ ] Cloud Spanner
- [x] Cloud Firestore
- [ ] Cloud Firebase

#### Q34. To bulk load data into Amazon Neputn, what do you do?
#### Q32. To bulk load data into Amazon Neputn, what do you do?
- [x] Upload data to S3 VPC endpoint, Use the Neptun loader to load from s3 into your Neptune instance
- [ ] Ad data to a Kinesis stream, and use the Neptune loade to load from S# into your Neptun instance.
- [ ] Add data to a Kisnesis stream, and create a Kinesis stream VPC endpoint. Use the Nepune loader to load from S3into your Neptune instance.
- [ ] Upload data to S Use the neptune loader to load from S3 into your Neptune instance.

#### Q35. You need to create a pub/sub server. Which databse do you use?
#### Q33. You need to create a pub/sub server. Which databse do you use?
- [ ] Neo4j
- [ ] Cassandra
- [x] Redis
- [ ] MyS#### QL

#### Q36. You want to connect a DynamoDb stream to an AWS lamdba function. Which one of these object do you create.
#### Q34. You want to connect a DynamoDb stream to an AWS lamdba function. Which one of these object do you create.
- [ ] DynamoDb table
- [x] DynamoDB trigger
- [ ] DynamoDB item
- [ ] DYnamoDB index

#### Q37. Which two types of indexes are available in Cosmos DB?
#### Q35. Which two types of indexes are available in Cosmos DB?
- [x] secondery and primary key
- [ ] secondary and spatial
- [ ] range and spatial
- [ ] range and primary key

#### Q38. SQL databses and NoSQL are which types of scalable?
#### Q36. SQL databses and NoSQL are which types of scalable?
- [ ] horizontally, infinitely
- [x] vertically, horizontally
- [ ] vertically, infinitely
- [ ] horizonally, vertically

#### Q39. You need to create a scalable database that allows you to query data nodes and edges efficiently. What do you use?
#### Q37. You need to create a scalable database that allows you to query data nodes and edges efficiently. What do you use?
- [ ] a relational databse
- [ ] a columnstore databse
- [ ] a document databse
- [x] a graph database

#### Q40. You are developing a model for a graph databse. Your data will be moved from a relatinal databse into Neo4j. Which of these transformations apply?
#### Q38. You are developing a model for a graph databse. Your data will be moved from a relatinal databse into Neo4j. Which of these transformations apply?
- [ ] Rows become labes: bales become nodes.
- [ ] Tables become labels: rows become nodes.
- [ ] Tables become collections: rows become items.
- [x] Rows become collections: tables become items.

#### Q41. To index a field that holds an array value in MongoDB, which index type do you create?
#### Q39. To index a field that holds an array value in MongoDB, which index type do you create?
- [ ] sparse
- [ ] compound
- [ ] partial
- [x] multikey

#### Q42. You need to execute a command for MongoDB that does NOT load values from the `.mongorc.js` file. What do you do ?
#### Q40. You need to execute a command for MongoDB that does NOT load values from the `.mongorc.js` file. What do you do ?
- [ ] Delete the .monorc.js file and restart mongo shell.
- [ ] Use the mongo shell to create a command with --norc option
- [ ] Rem all lines in the .mongorc.js file ad restart mongo shell.
- [x] Use the mongo shell to create a command with --nodedefault option.

#### Q43. What is the recommended size for Redis keys?
#### Q41. What is the recommended size for Redis keys?
- [ ] long
- [ ] short
- [ ] medium
- [x] a single bit

#### Q42. You need to store an unordered collection of name-value pairs with differing data types in DynamoDB. Which data type should you choose?
- [x] map
- [ ] set
- [ ] list
- [ ] stack

#### Q43. Which statement retrieves an item from the MusicCollection table in DynamoDB?
- [ ] aws dynamodb query --table-name MusicCollection --key file://key.json
- [x] aws dynamodb get-item --table-name MusicCollection --key file://key.json
- [ ] aws dynamodb select --table-name MusicCollection --key file://key.json
- [ ] aws dynamodb put-item --table-name MusicCollection --key file://key.json

#### Q44. Database availability is measured by which metric?
- [ ] the amount of service calls
- [ ] the number of minutes
- [ ] the amount of service costs
- [ ] the number of nines

#### Q44. You need to encrypt data at rest in DynamoDB. Which action do you take?
- [ ] You assign a default AWS encryption key to your table to encrypt data.
- [ ] You create an AWS encryption key and assign it to your table to encrypt data.
- [ ] None. Data is encrypted by default.
- [ ] You create an AWS encryption key and assign it to your database to encrypt data.

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