Connect your devices together | Service Bus

Question 1

What are the three characteristics of an event?

Answer 1

• The event may be sent to multiple receivers, or to none at all
• Events are often intended to “fan out,” or have a large number of subscribers for each publisher
• The publisher of the event has no expectation about the action a receiving component takes

Question 2

Is Service Bus designed to handle messages or events?

Answer 2

Messages.

Question 3

In which three ways can Service Bus exchange messages?

Answer 3

Queues, topics, and relays

Question 4

Are Topics included in the basic pricing tier of Service Bus?

Answer 4

No, it’s not supported.

Question 5

What is the difference between Storage queues and Service Bus queues?

Answer 5

As a general guide, storage queues are simpler to use but are less sophisticated and flexible than Service Bus queues.

Question 6

What are the advantages of Service Bus queues over Storage queues?

Answer 6

Supports larger messages sizes of 256 KB (standard tier) or 1MB (premium tier) per message versus 64 KB
Supports both at-most-once and at-least-once delivery - choose between a very small chance that a message is lost or a very small chance it is handled twice
Guarantees first-in-first-out (FIFO) order - messages are handled in the same order they are added (although FIFO is the normal operation of a queue, it is not guaranteed for every message)
Can group multiple messages into a transaction - if one message in the transaction fails to be delivered, all messages in the transaction will not be delivered
Supports role-based security
Does not require destination components to continuously poll the queue

Question 7

What are the advantages of Storage queues over Service Bus queues?

Answer 7

• Supports unlimited queue size (versus 80-GB limit for Service Bus queues)
• Maintains a log of all messages

Question 8

Which azure services can you use for events?

Answer 8

Event Grid or Event Hubs.

Question 9

Should a single message be delivered to more than one destination? If so, use ___. Otherwise, use ___.

Answer 9

a Service Bus topic

Otherwise a queue

Question 10

Boolean Filters. The TrueFilter ensures that ___ to the current subscription. The FalseFilter ensures that ___ to the current subscription.

Answer 10

all messages sent to the topic are delivered

none of the messages are delivered (This effectively blocks or switches off the subscription.)

Question 11

Why would you choose a correlation filter over a SQL filter for service bus?

Answer 11

SQL filters are the most computationally expensive and could slow down our Service Bus throughput

Question 12

Why would you choose a SQL filter over a correlation filter?

Answer 12

SQL filters are the most flexible.