Alibaba ACA-Developer Quiz 1 Topic 8 Questions 1-5

Question: 1

When you use SQL statements to access tables in a database without an index configured, a full table scan will be performed. If a table contains a large amount of data, this kind of scan will access a large amount of data and consume a lot of the database's resources. Which of the following options are best practices when creating database indexes? (Number of correct answers: 3)

AAdd an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations.

BApplies indices to fields that contain many records.

Ctable should not contain more than 6 indexed fields.

DApply indexing to fields of fixed length (preferably not long fields).

EAdhere to the rightmost prefix principle when using composite indexes.

Show Answer

Question: 2

You can create an event notification rule in Message Service and push notifications to the specified consumer in the form of messages, to receive events from specified Alibaba Cloud resources. Which of the following options are correct statements about the Message Service (MS) service? (Number of correct answers: 2)

AEvent Notifications can cross regions.

BMessage Service provides synchronous notifications to ensure the consistency between the message acknowledgment and event processing.

CThe event notification message is retained within the valid time. When you fail to receive an event message, the event notification message is retried based on the specified retry policy.

DThe consumer type of the event notification message can be HTTP Server, Queue, or Topic.

Show Answer

Question: 3

A developer recently discovered that their company's application is beginning to suffer performance degradation as a result of increased user demand for the application. After some analysis, the major bottleneck is discovered to be the RDS database instance which hosts the company's databases, "A" and "B". The developer plans to use the DTS data migration solution to move one of the databases to a new RDS instance. Which of the following statements is correct? (Number of correct answers: 3)

AThe code for the application will have to be rewritten once this migration is complete.

BThe database account used for data migration must have read and write permissions. To ensure database security, please delete the database account used for data migration or reclaim related write permissions after data migration is completed.

CAfter disconnecting the connection between the source instance database B and the application, you need to log in to the source database B to check the session messages to ensure that no new sessions performed write operations.

DCreate a reverse data migration task and start it to migrate subsequent incremental data from target Instance database B to source instance database B.

Show Answer

Question: 4

CloudMonitor's "Event Monitoring" feature provides you with event reporting, query, and alarm functions, Score 2 so that you can collect metrics on your running Alibaba Cloud systems, and receive alerts when something goes wrong. Which of these is NOT a correct description of the monitoring event types supported by CloudMonitor?

AFor ECS, CloudMonitor supports the collection and reporting of important ECS operating system level events, such as application crashes.

BFor Object Storage Service (OSS), CloudMonitor supports the collection and reporting of bucket upstream and downstream bandwidth which exceeds the flow control threshold or the user-selected reporting threshold.

CFor Server Load Balancer (SLB), CloudMonitor supports the collection and reporting of HTTPS certificate expiration events, for certificates installed on SLB.

DFor E-MapReduce, CloudMonitor supports the collection and reporting of service component status, cluster creation failure, and timeout events.

Show Answer

Question: 5

By default Function Compute cannot access resources within a VPC network group. To enable Function Compute to access resources located in a VPC, which of the following parameters needs to be configured? (Number of correct answers: 3)

Avpcld

BvSwitchlds

CsecurityGroupId

DENIID
Specifies whether to allow functions to access VPC resources.
On: Functions can access VPC resources.
If you turn on the switch, you must set the following parameters:
VPC: Select a VPC.
Vswitches: Select one or more vSwitches.
Security Group: Select the security group with which your ENI is associated.
Off: Functions cannot access VPC resources.
https://www.alibabacloud.com/help/doc-detail/72959.htm

Show Answer

Alibaba ACA-Developer Quiz:1 Topic:8 Questions:1-5