Alibaba ACA-Database Exam Practice Test Instant Access

Question 1

When high availability switchovers occur in a database, which of the following features provided by ApsaraDB RDS for PostgreSQL can prevent the incremental data loss of logical subscriptions?

AGanos

BPase

CSlot failover

DHigh concurrency optimization

EPoint-in-time restore

Answer : E

Question 2

You need to migrate a database that has a storage capacity of 50 GB to the cloud and can tolerate a service downtime of half an hour. In this case, which of the following migration methods is the optimal choice to migrate data to the cloud in terms of stability and availability?

AFull backup and incremental backup

BFull backup only

CLogical migration tools

DIncremental backup only

Answer : C

Question 3

Which of the following statements about Alibaba Cloud ApsaraDB for MongoDB is true?

AIt takes a longer time to perform operations and maintenance (O&M) on ApsaraDB for MongoDB instances than on self-installed and self-managed MongoDB.

BDataWorks is not supported for MongoDB data processing.

CAlibaba Cloud and MongoDB have a strategic partnership, so Alibaba Cloud Is able to provide the latest MongoDB features in our ApsaraDB for MongoDB product, in all our global regions.

Answer : C

Question 4

Which of the following statements about Data Transmission Service (DTS) migration scenarios is NOT true?

ADTS can migrate data in a circular way, for example, A > B > C > A.

BDTS can migrate data from one source database to one destination database, for example, A > B.

CDTS can migrate data from one source database to several destination databases, for example, A > B and A > C.

DDTS can migrate data from several source databases to one destination database, for example, A > C and B > C.

Answer : A

Question 5

PolarDB for MySQL uses shared distributed storage and supports dual-zone deployment by default. How many data replicas are available across the two zones?

Answer : D

Question 6

Which of the following is the high-availability service level that is specified in the ApsaraDB RDS Service Level Agreement (SLA)?

A90%

B99%

C99.5%

D99.99%

Answer : D

Question 7

Why is ApsaraDB for PolarDB better than other traditional database engines? (The number of answer: 3)

AWhen you purchase a PolarDB cluster, you don't need to specify the storage capacity you want to purchase

BPolarDB supports both OLTP and OLAP scenarios very well

CThe PolarDB database engine won't require you to replicate data when adding read-only nodes

DApsaraDB for PolarDB uses the pay-as-you-go billing method, therefore you only need to pay for the storage resources you actually use

Answer : A, C, D

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Alibaba ACA-Database ACA Database Exam Practice Test