CosmosDB

Question 1

What are the different APIs avaialble from Azure Cosmos DB?

Answer 1

• NoSQL
• MongoDB
• PostgreSQL
• Cassandra
• Gremlin
• Table

Question 2

What is the recommended choice of DB in Cosmos for Open-source releation DB with high perf and geo-replication?

Answer 2

Azure Cosmos DB for PostgreSQL

Question 3

Which graph computing framework is Azure Cosmos DB for Gremlin based on?

Answer 3

Apache TikerPop

Question 4

What is Partition in Cosmos Db?

Answer 4

When you want multiple, related documents to sit in the same partition.

Question 5

What is the max RU/s limit for Physical and Logical Partition in CosmosDb?

Answer 5

10,000 RU/s

Question 6

What is the size limit for a Physical Partition in CosmoDb?

Answer 6

50GB

Question 7

What is a Replica Set?

Answer 7

Each physical partition in Cosmos DB consists of a set of replicas, also referred to as a replica set.

Question 8

What is a Partition Set?

Answer 8

Partition set refers to a group of physical partitions that manage the same logical partition keys across multiple regions

Question 9

What is a RU (Request Unit) in Cosmos Db?

Answer 9

The cost to do a point read (fetching a single item by its ID and partition key value) for a 1-KB item is one Request Unit (or one RU).

Question 10

What are the different modes in which the consumed RU/s are charged?

Answer 10

1. Provisioned throughput
2. Serverless
3. Autoscale

Question 11

What is a Change feed in CosmosDB?

Answer 11

Change feed in Azure Cosmos DB is a persistent record of changes to a container in the order they occur. Change feed support in Azure Cosmos DB works by listening to an Azure Cosmos DB container for any changes.

Question 12

What is the sort order of Change feed?

Answer 12

Change feed items come in the order of their modification time. This sort order is guaranteed per partition key, and there’s no guaranteed order across the partition key values.

Question 13

What are the different modes for Change Feed?

Answer 13

1. Latest version
2. All Versions and Deletes mode

Question 14

What are the two modes for backup in Cosmos DB?

Answer 14

• Continuous backup mode (7 or 30 day)
• Periodic backup mode (1hr to max 30 days)

Question 15

What are the different consistency levels in CosmosDB?

Answer 15

• Strong
• Bounded staleness
• Session
• Consistent prefix
• Eventual

Question 16

What are Synthetic Partition Keys in Azure Cosmos DB?

Answer 16

The goal is to distribute your data and workload evenly across the items associated with these partition key values. If such a property doesn’t exist in your data, you can construct a synthetic partition key.