Alibaba ACA-Developer Exam Practice Test Instant Access

Question 1

Which of the following options is not included in Object Storage Service (OSS) object URLs?

ARegion name

BZone name

CBucket name

DFilename

Answer : A

Question 2

A Developer is asked to implement a caching layer in front of RDS. Cached content is expensive to regenerate in case of service failure. Which implementation below would work while maintaining maximum uptime?

AImplement ApsaraDB for Redis in Cluster Mode

BInstall Redis on an ECS instance

CImplement ApsaraDB for Redis in Standard Mode

DMigrate the ROS database to HBase to save the cache layer

Answer : D

Question 3

What are the required parameters for the Python SDK to create a client to access Alibaba Cloud's API? (Number of correct answers: 3)

Aaccess.keyjd

Baccess.key.secret

Cregionjd

Dzone jd

Evpcjd

Answer : A, B, C

https://www.alibabacloud.com/help/doc-detail/53090.htm

Question 4

Alibaba Cloud's ECS disk snapshotting tool can create crash-consistent snapshots for all types of Cloud Disks. It is a convenient and efficient disaster recovery method. It is often used for data backup, custom mirroring, application disaster recovery, etc. Which of the following is NOT a correct description of disk snapshots?

AA snapshot is a backup file of the cloud disk data state at a certain point in time. The first snapshot of the cloud disk is a full snapshot of the ac usage. Empty data blocks are not backed up. All subsequent snapshots are incremental snapshots, and only changed data blocks are stored.

BSnapshots can be created manually through the web console or command line tools, or automatically according to a schedule.

CIn the event of a system failure, you can use a snapshot to roll back the Cloud Disk to an earlier point in time.

DSnapshot rollbacks can be performed while the ECS instance is running.

Answer : A

Question 5

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.

Answer : A, B, D

Question 6

Function Compute supports one-way triggers and two-way triggers. Which of the following triggers is a one-way trigger? That is to say you only need to configure the trigger in the event source, not in Function Compute?.

AOSS event trigger(s)

BCloudMonitor trigger(s)

CMNS topic trigger(s)

DSLS trigger(s)

Answer : B

Question 7

A developer is making the ModifyDDInstanceSpec API call to change the specifications of an RDS instance, but the operation fails. Why could this be? (Number of correct answers: 3)

AThe instance is in the running state

BNo instance type (specification) was included in the request parameters

CThe instance has a backup task being executed

DThe targeted RDS instance is a disaster recovery instance

Answer : A, B, C

Alibaba ACA-Developer ACA Developer Exam Practice Test