ACA-Database: Alibaba Cloud ACA-Database - Free download from Exam Files

Which of the following statements is NOT correct about PolarDB?

ApsaraDB for PolarDB is a cloud-native relational database service that is compatible with the MySQL, PostgreSQL, and Oracle engines
Each ApsaraDB for PolarDB cluster supports up to 100 TB of storage space and can handle up to one million queries per second (QPS)
ApsaraDB for PolarDB can scale clusters within a few minutes, recover from failures within a few seconds, and guarantee data consistency
An ApsaraDB for PolarDB cluster can also be scaled out to a maximum of 16 nodes, and provide up to 6 times of performance improvement traditional MySQL clusters at a 30% to 50% cost reduction
ApsaraDB for PolarDB is designed to handle large amounts of sequential queries

Correct answer: E

Explanation:

PolarDB is 6 times faster than standard MySQL database in handling large amounts of concurrent queries. https://www.alibabacloud.com/product/polardb

Which database utility is good for database management and DevOps?

DMS
DBS
DTS
DAS
ADAM

Correct answer: A

Explanation:

Database DevOps Solutions. https://www.alibabacloud.com/product/data-management-service / https://www.alibabacloud.com/help/doc-detail/190124.htm?spm=a2c63.p38356.b99.40.6ad93d19Xe9h14

What is the maximum storage size that PolarDB currently provides?

1TB
10TB
50TB
100TB

Correct answer: D

Explanation:

Each PolarDB cluster supports to scale up to 100 TB. https://www.alibabacloud.com/product/polardb

Suppose you are using MySQL currently, if you want to migrate to cloud native database PolarDB with little effort, which one is the best choice?

PolarDB MySQL
PolarDB PosgreSQL
PolarDB Oracle
PolarDB Box

Correct answer: A

Explanation:

https://www.alibabacloud.com/help/doc-detail/58768.htm?spm=a2c63.l28256.b99.10.71ce3784cXj0y8

Which of the followings is NOT a correct way to connect to PolarDB?

Use the command line like 'mysql' to connect to a cluster
Use DMS to connect to a cluster
Use a client like HeidiSQL to connect to a cluster
Use PolarDB console to log into a cluster

Correct answer: D

Explanation:

Use the PolarDB console to log on to Database. https://www.alibabacloud.com/help/doc-detail/68511.htm?spm=a2c63.p38356.879954.7.7c2855b1aLLHjb#task-1580301

Which of the following statements is NOT correct about the benefits you can gain through PolarDB?

Large storage space
Elastic scaling within minutes
When you add a read-only node in an ApsaraDB for PolarDB cluster, you only need to pay for computing resources
Millisecond-level latency in physical replication
locked backup

Correct answer: E

Explanation:

Lock-free backup. https://www.alibabacloud.com/help/doc-detail/58768.htm?spm=a2c63.p38356.b99.10.1bcb7338k86bX5

If you have a development team with several developers working on cloud databases, which product is recommended to use for development collaboration?

DMS
DBS
DTS
DAS
DG

Correct answer: A

Explanation:

A series of step-based solutions for R&D processes, data security, and data development are provided in the Data Management (DMS) console to get you started with DMS. https://www.alibabacloud.com/help/doc-detail/190124.htm?spm=a2c63.p38356.b99.40.6ad93d19Xe9h14

Which database utility is used for data migration and synchronization?

DMS
DBS
DTS
DAS
ADAM

Correct answer: C

Explanation:

Data Transmission Service is charged based according to three models: Data Synchronization, Data Migration, Change Tracking. https://www.alibabacloud.com/product/data-transmission-service/pricing

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

A PolarDB cluster contains one primary instance and up to 15 read-only instances
PolarDB consolidate compute processes and storage processes in one box, allowing the database capacity to scale up and down to meet yourapplication needs in Alibaba Cloud
Read/write splitting is enabled for PolarDB clusters by default, providing transparent, highly available, and self-adaptive load balancing for yourdatabase
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

Correct answer: B

Explanation:

PolarDB decouples compute from storage. https://www.alibabacloud.com/help/doc-detail/58766.htm?spm=a2c63.p38356.b99.11.4e333181dMpFmV

PolarDB for MySQL allows you to deploy a cluster across multiple zones. Compared with single-zone

clusters, multi-zone clusters have better disaster recovery capabilities and can withstand data centre-level faults.

True
False

Correct answer: A

Explanation:

Compared with single-zone clusters, multi-zone clusters can enhance disaster recovery capabilities and withstand the breakdown of an entire data center. https://www.alibabacloud.com/help/doc-detail/122182.htm?spm=a2c63.p38356.879954.4.6f2fa25362cz60#task-1580301