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Question # 4

Your DTS (Data Transmission Service) migration has failed halfway through: what options do you

have? (Number of correct answers: 2)

A.

Delete your DTS instance and start over

B.

Restart the migration task from the console

C.

Your database can't be migrated: you need to abandon the migration

D.

You need to switch to ADAM, as DTS cannot complete the migration

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Question # 5

You want to migrate from MySQL to PostgreSQL: is this supported by DTS?

A.

No, this type of migration isn't supported

B.

You can migrate between MySQL and Oracle but not between PostgreSQL

C.

Yes, migration between different types of databases is supported by DTS

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Question # 6

What is the maximum number of read-only nodes in a PolarDB cluster?

A.

1

B.

5

C.

10

D.

15

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Question # 7

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 # 8

Your client is having trouble connecting DTS to their source database in their local datacenter, why might this be?

A.

Their database isn't on Alibaba Cloud already so it cannot be accessed by DTS

B.

Their database is not accessible from the Internet, so DTS cannot access it

C.

Their database must not include the special DTS compatibility mode

D.

Their database is an inverted column store, which is not supported

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Question # 9

Which of the following features determines high performance of the performance-enhanced instances of ApsaraDB for Redis Enhanced Edition (Tair)?

A.

Extended data structure modules

B.

Multithreading

C.

Global Replica

D.

Data flashback

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Question # 10

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 # 11

You are using DTS to migrate from a MySQL database installed on an ECS instance to a target

database on RDS. In the DTS console, which of these is the correct "Instance Type" for the database?

A.

ECS-based Databases

B.

Express Connect DB

C.

RDS Instance

D.

ApsaraDB MongoDB

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Question # 12

Which of the following are the advantages of cloud databases over self-managed databases? (Number of correct answers: 3)

A.

Stronger service level agreement (SLA)

B.

Integrated operations and maintenance (O&M), as well as easier management

C.

High availability and comprehensive backup and monitoring capabilities

D.

High costs

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