8/8/25, 4:54 PM Developing Solutions for Microsoft Azure - Exam Ref AZ-204 Chapter 2 - D306 Azure Developer Associate
Developing Solutions for Microsoft Azure - Exam
Ref AZ-204 Chapter 2 - D306 Azure Developer
Associate
It is a premium storage service that Azure provides for
a globally distributed, low latency, highly responsive,
What is Cosmos DB
and always online Database. Has scalability and
throughput in mind.
Key-Value
What are the 4 ways you
Column Family
can store your data in
Documents
Cosmos DB?
Graph Approaches
What are the current APIs SQL, Cassandra, Table, Gremlin, and MongoDB
that can access
CosmosDB?
It is the core and default API for accessing data in
CosmosDB. You can query JSON objects using SQL
What is SQL API?
syntax, Uses Javascript. This is a Data Structure based
on Documents.
It is like the evolution of Azure Table Storage. It has
High Performance, low latency, and highly scalable
What is Table API features. Can migrate from Azure table storage with
no code modifications. You can define your own
indexes. This is a data structure based on Documents.
… 1/8
, 8/8/25, 4:54 PM Developing Solutions for Microsoft Azure - Exam Ref AZ-204 Chapter 2 - D306 Azure Developer Associate
This is a wire protocol Apache Data Base. How this is
implemented means you do not have to worry about
operations or performance management tasks related
to managing this DB. Can migrate from a Cassandra
What is Cassandra API?
DB to this DB merely by changing the connection
string. Compatible with CQLv4 wire protocol. This is a
Column Based DB that stores info in a Key-Value
approach.
This is a NoSQL DB with a Document based Structure.
What is MongoDB API? CosmosDB enables a wire protocol to connect but
this API must be version 3.2 or higher.
Based on Apache TinkerPop Graph transversal
language. This uses a Graph structure. This stores
entities but also:
What is Gremlin API?
1. Vertices - (entity such as person, device or event)
2. Edges - Relationships between vertices
3. Properties - each of the attributes that are assigned
to a vertex or edge.
Can you use multiple APIs No you can only choose one.
in a single CosmosDB
account?
When you divide a CosmosDB container into smaller
What is a logical partition
pieces, each piece is a logical partition. All items
for Cosmos DB
stored on this partition share the same partition key.
A group of replicas of data that is physically stored on
What is a physical partition
servers. Azure manages this group of replicas. Can
for CosmosDB?
contain one or more Logical partitions.
By default what is the 20GB
storage limit for a logical
partition?
It is when you select a partition key with few possible
What is a "hot" partition? values and the partition receives most of the requests
reaching the throughput limit.
… 2/8
Developing Solutions for Microsoft Azure - Exam
Ref AZ-204 Chapter 2 - D306 Azure Developer
Associate
It is a premium storage service that Azure provides for
a globally distributed, low latency, highly responsive,
What is Cosmos DB
and always online Database. Has scalability and
throughput in mind.
Key-Value
What are the 4 ways you
Column Family
can store your data in
Documents
Cosmos DB?
Graph Approaches
What are the current APIs SQL, Cassandra, Table, Gremlin, and MongoDB
that can access
CosmosDB?
It is the core and default API for accessing data in
CosmosDB. You can query JSON objects using SQL
What is SQL API?
syntax, Uses Javascript. This is a Data Structure based
on Documents.
It is like the evolution of Azure Table Storage. It has
High Performance, low latency, and highly scalable
What is Table API features. Can migrate from Azure table storage with
no code modifications. You can define your own
indexes. This is a data structure based on Documents.
… 1/8
, 8/8/25, 4:54 PM Developing Solutions for Microsoft Azure - Exam Ref AZ-204 Chapter 2 - D306 Azure Developer Associate
This is a wire protocol Apache Data Base. How this is
implemented means you do not have to worry about
operations or performance management tasks related
to managing this DB. Can migrate from a Cassandra
What is Cassandra API?
DB to this DB merely by changing the connection
string. Compatible with CQLv4 wire protocol. This is a
Column Based DB that stores info in a Key-Value
approach.
This is a NoSQL DB with a Document based Structure.
What is MongoDB API? CosmosDB enables a wire protocol to connect but
this API must be version 3.2 or higher.
Based on Apache TinkerPop Graph transversal
language. This uses a Graph structure. This stores
entities but also:
What is Gremlin API?
1. Vertices - (entity such as person, device or event)
2. Edges - Relationships between vertices
3. Properties - each of the attributes that are assigned
to a vertex or edge.
Can you use multiple APIs No you can only choose one.
in a single CosmosDB
account?
When you divide a CosmosDB container into smaller
What is a logical partition
pieces, each piece is a logical partition. All items
for Cosmos DB
stored on this partition share the same partition key.
A group of replicas of data that is physically stored on
What is a physical partition
servers. Azure manages this group of replicas. Can
for CosmosDB?
contain one or more Logical partitions.
By default what is the 20GB
storage limit for a logical
partition?
It is when you select a partition key with few possible
What is a "hot" partition? values and the partition receives most of the requests
reaching the throughput limit.
… 2/8
