Ultimate Guide to Prepare ACA-Database Certification Exam for Alibaba Database in 2021
Use Real ACA-Database Dumps - Alibaba Cloud Correct Answers updated on 2021
Alibaba Cloud ACA-Database Exam Syllabus Topics:
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NEW QUESTION 42
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. False
- B. True
Answer: A
Explanation:
Explanation
PolarDB cluster supports Manually and Automatically switch over services between primary and read-only nodes.
https://www.alibabacloud.com/help/doc-detail/141229.htm?spm=a2c63.p38356.b99.113.36df231dK2DVX0
NEW QUESTION 43
Which of the following are relational databases? (Number of correct answers: 5)
- A. MariaDB
- B. SQL Server
- C. HBase
- D. PostgreSQL
- E. Oracle
- F. TSDB
- G. MySQL
- H. Redis
- I. MongoDB
Answer: A,B,D,E,G
NEW QUESTION 44
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 visualization
- C. Data quality
- D. Data service
- E. Data directory
Answer: A,C,D
NEW QUESTION 45
Which of the following are the advantages of cloud databases over self-managed databases? (Number of correct answers: 3)
- A. High costs
- B. Integrated operations and maintenance (O&M), as well as easier management
- C. Stronger service level agreement (SLA)
- D. High availability and comprehensive backup and monitoring capabilities
Answer: B,C,D
NEW QUESTION 46
Which of the following statements about Data Transmission Service (DTS) migration scenarios is NOT true?
- A. DTS can migrate data from one source database to one destination database, for example, A > B.
- B. DTS can migrate data from several source databases to one destination database, for example, A > C and B > C.
- C. DTS can migrate data from one source database to several destination databases, for example, A > B and A > C.
- D. DTS can migrate data in a circular way, for example, A > B > C > A.
Answer: D
NEW QUESTION 47
Which of the following statements about Data Management (DMS) permissions management is NOT true?
- A. You cannot directly submit changes even if you have permissions to make changes.
- B. The permissions of the accounts of resigned or transferred personnel can be automatically managed by using OpenAPI.
- C. You can assign different resources and operation permissions to an Alibaba Cloud account as needed.
- D. You must create different database accounts for each Alibaba Cloud account.
Answer: A
NEW QUESTION 48
Alibaba Cloud DTS (Data Transmission Service) can only migrate between databases that are hosted on RDS.
- A. False
- B. True
Answer: A
Explanation:
Explanation
Alibaba Cloud Data Transmission Service (DTS) helps you migrate data between data stores, such as relational databases, NoSQL databases, and data warehouses. You can use DTS to migrate your data to Alibaba Cloud or between combinations of cloud and on-premises data systems. .
https://www.alibabacloud.com/help/doc-detail/176063.htm?spm=a2c63.p38356.b99.6.2ef8c790WL4Jku
NEW QUESTION 49
Which of the following architectures is not supported by ApsaraDB RDS for MySQL?
- A. The serverless architecture, in which computing resources are charged based on the Pay-As-You-Go (PAYG) billing method
- B. The single-node Basic Edition architecture, which can be used in test and non-core production environments
- C. The three-node Enterprise Edition architecture, which ensures zero data loss
- D. The high-avail ability architecture, in which primary and read-only nodes are deployed to implement automatic failovers
Answer: A
NEW QUESTION 50
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.
- A. False
- B. True
Answer: B
NEW QUESTION 51
Which of the following is the wrong statement about PolarDB design architecture?
- A. 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
- B. A PolarDB cluster contains one primary instance and up to 15 read-only instances
- C. 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
- D. Read/write splitting is enabled for PolarDB clusters by default, providing transparent, highly available, and self-adaptive load balancing for your database
Answer: C
Explanation:
Explanation
PolarDB decouples compute from storage.
https://www.alibabacloud.com/help/doc-detail/58766.htm?spm=a2c63.p38356.b99.11.4e333181dMpFmV
NEW QUESTION 52
Which database utility is used for data migration and synchronization?
- A. DTS
- B. DAS
- C. DBS
- D. ADAM
- E. DMS
Answer: A
Explanation:
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
NEW QUESTION 53
Which of the following are features supported by Alibaba Cloud RDS for MySQL? (The number of
- A. 3)
- B. Local Snapshot Backup-> Snapshot Backup is Cloud disk instance. Cross-region backup is Local disk instance.
- C. Multi-Zone Deployment ->You can select the Single-zone Deployment or Multi-zone Development method.
https://www.alibabacloud.com/help/doc-detail/26092.htm?spm=a2c63.p38356.b99.18.118b4437l50tDl - D. ACD
- E. Computing nodes and Storage totally seperated-> In the Basic Edition, your database system consists of only one primary RDS instance, and computing is separated from storage. This edition is cost-effective.
https://www.alibabacloud.com/help/doc-detail/48980.html?spm=a2c5t.11065259.1996646101.searchclick - F. Read-Write Splitting ->
https://www.alibabacloud.com/help/doc-detail/96047.htm?spm=a2c63.p38356.b99.57.500dc3c6Kt0QLs
Answer: A,D
NEW QUESTION 54
Which of the followings is NOT a correct way to connect to PolarDB?
- A. Use a client like HeidiSQL to connect to a cluster
- B. Use PolarDB console to log into a cluster
- C. Use the command line like 'mysql' to connect to a cluster
- D. Use DMS to connect to a cluster
Answer: B
Explanation:
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-
NEW QUESTION 55
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?
- A. Full backup and incremental backup
- B. Logical migration tools
- C. Incremental backup only
- D. Full backup only
Answer: B
NEW QUESTION 56
PolarDB for MySQL uses shared distributed storage and supports dual-zone deployment by default. How many data replicas are available across the two zones?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION 57
Which of the following are the core technologies behind Database Backup Service? (Number of correct answers: 3)
- A. Multi-cloud and multi-backend backup
- B. Online query and analysis
- C. High mount speeds (a few seconds)
- D. Real-time synchronization
Answer: A,C,D
NEW QUESTION 58
Which of the following statements about Alibaba Cloud ApsaraDB for MongoDB is true?
- A. DataWorks is not supported for MongoDB data processing.
- B. Alibaba 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.
- C. It takes a longer time to perform operations and maintenance (O&M) on ApsaraDB for MongoDB instances than on self-installed and self-managed MongoDB.
Answer: B
NEW QUESTION 59
Which of the following data is not collected when database information is collected in Advanced Database & Application Migration (ADAM)?
- A. Historical performance data
- B. Database configuration data
- C. Business data
- D. Business structure data
Answer: C
NEW QUESTION 60
Which of the following are NOT true, regarding DTS (Data Transmission Service)? (Number of correct answers: 2)
- A. The source and destination database must both have a database user which DTS can use
- B. If the source database is not on Alibaba Cloud, it must be Internet accessible so that DTS can connect to it
- C. The source and destination database must use the same database engine
- D. DTS is designed for file synchronization
Answer: C,D
NEW QUESTION 61
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