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ACA-Database Questions and Answers

Question # 6

Each PolarDB cluster consists of one primary node and one or more read-only nodes. The system only support manually switch over services from the primary node to a read-only node.

A.

True

B.

False

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Question # 7

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

A.

90%

B.

99%

C.

99.5%

D.

99.99%

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Question # 8

DTS (Data Transmission Service) must have access to a database user account on both the target and source database, in order to work.

A.

True

B.

False

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Question # 9

PolarDB for MySQL archive databases use log-structured merge-trees (LSM trees) and the Zstandard (ZSTD) data compression algorithm to increase the data compression ratio. How much storage can be saved, at most?

A.

40%

B.

50%

C.

60%

D.

70%

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Question # 10

Data Management (DMS) provides features related to data warehouse development to support task orchestration and recurring scheduling. Which of the following features are being developed? (Number of correct answers: 3)

A.

Data lineage

B.

Data quality

C.

Data visualization

D.

Data directory

E.

Data service

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Question # 11

Which of the following deployment architectures are supported by Alibaba Cloud ApsaraDB for MongoDB? (Number of correct answers: 3)

A.

Standalone instance

B.

Primary/secondary instance that consists of two nodes

C.

Replica set instance that consists of three nodes

D.

Sharded cluster instance

E.

Replica set instance that consists of six nodes

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Question # 12

Which of the following is the lowest recovery point objective (RPO) for Database Backup Service?

A.

Seconds

B.

Minutes

C.

Hours

D.

Days

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