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Alibaba Cloud ACA-Database - ACA Database Certification

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Total 80 questions

Which of the following architectures are supported by ApsaraDB for Redis Enhanced Edition (Tair)? (Number of correct answers: 3)

A.

Master-replica architecture in which standard master-replica instances are deployed

B.

Read/write splitting architecture in which standard master-replica instances are deployed

C.

Cluster master-replica instances

D.

Single-node architecture

Which of the following architectures is not supported by ApsaraDB RDS for MySQL?

A.

The single-node Basic Edition architecture, which can be used in test and non-core production environments

B.

The high-avail ability architecture, in which primary and read-only nodes are deployed to implement automatic failovers

C.

The three-node Enterprise Edition architecture, which ensures zero data loss

D.

The serverless architecture, in which computing resources are charged based on the Pay-As-You-Go (PAYG) billing method

Which of the following is NOT true, regarding the sensitive data management feature provided by Data Management (DMS)?

A.

The rules of field metadata and data content can be automatically recognized.

B.

De-identification algorithms can be managed. Multiple algorithms are supported, such as algorithms for masking specific positions and replacing fixed characters.

C.

Field-level and row-level permissions are supported.

D.

After you configure de-identification algorithms, you can view the de-identified data.

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%

If a database exception occurs in a PolarDB cluster because important data is deleted by mistake, how i can data be restored?

A.

Level-2 backup + Redo log

B.

Level 1 backup + Redo log

C.

Level-2 backup

D.

Level-1 backup

Which of the following are relational databases? (Number of correct answers: 5)

A.

Oracle

B.

MySQL

C.

PostgreSQL

D.

MongoDB

E.

MariaDB

F.

Redis

G.

TSDB

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

Which of the following is the wrong statement about PolarDB design architecture?

A.

A PolarDB cluster contains one primary instance and up to 15 read-only instances

B.

PolarDB consolidate compute processes and storage processes in one box, allowing the database capacity to scale up and down to meet your

application needs in Alibaba Cloud

C.

Read/write splitting is enabled for PolarDB clusters by default, providing transparent, highly available, and self-adaptive load balancing for your

database

D.

High speed network connection is enabled between the DB server and the chunk server, and data are transferred using the Remote Direct Memory Access (RDMA) protocol

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?

A.

Ganos

B.

Pase

C.

Slot failover

D.

High concurrency optimization

E.

Point-in-time restore

Alibaba Cloud DTS (Data Transmission Service) supports both full database migration and incremental synchronization.

A.

True

B.

False