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Alibaba Cloud ACA-Database Exam Syllabus Topics:
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NEW QUESTION 28
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 29
Which of the following are the benefits of database views? (Number of correct answers: 3)
- A. Easier for data visualization
- B. Simplicity in structure: presents the database as a set of virtual tables specific to particular users or groups of users
- C. Simplicity for queries
- D. Stabilization of information: presents a consistent, unchanged image of the database structure
Answer: B,C,D
NEW QUESTION 30
Which of the following tools can be used to migrate an on-premises database to Alibaba Cloud while causing minimal service downtime?
- A. pg_dump
- B. pg_basebackup
- C. pg_restore
- D. pg_upgrade D.DTS
Answer: B
NEW QUESTION 31
Which of the following statements about MongoDB is NOT true?
- A. MongoDB is a relational database.
- B. MongoDB is a document database.
- C. MongoDB can be deployed in cluster mode.
- D. MongoDB supports transactions.
Answer: A
NEW QUESTION 32
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. 60%
- B. 70%
- C. 40%
- D. 50%
Answer: B
NEW QUESTION 33
You have a client that wants to move from another cloud provider's database service to RDS. Which of these is the best way to move their database to Alibaba Cloud?
- A. Use DTS (Data Transmission Service)
- B. This type of migration isn't possible
- C. Migrate the entire VM hosting the database
- D. Make a full physical backup of their database and copy it into OSS
Answer: A
NEW QUESTION 34
Which of the following statements about AnalyticDB for MySQL is true?
- A. AnalyticDB for MySQL supports transactions.
- B. AnalyticDB for MySQL can be used to build online transaction systems.
- C. AnalyticDB for MySQL can be used to build enterprise-grade data warehouse projects.
- D. AnalyticDB for MySQL is a NoSQL database.
Answer: C
NEW QUESTION 35
Which database utility is good for database management and DevOps?
- A. DAS
- B. DBS
- C. DTS
- D. ADAM
- E. DMS
Answer: E
Explanation:
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
NEW QUESTION 36
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 37
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 38
Which of the following types of data are most suitable for storage in MySQL databases?
- A. Key-value (KV) data that is frequently read and written
- B. Structured data in rows and columns
- C. Document-oriented unstructured data
- D. Large amounts of time series data
Answer: B
NEW QUESTION 39
Which of the following is the most efficient backup in ApsaraDB for MongoDB?
- A. Full backup
- B. Logical backup
- C. Snapshot backup
- D. Physical backup
Answer: D
NEW QUESTION 40
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 41
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 42
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 43
Which of the following features are provided by PolarDB-O's proxy? (Number of correct answers: 4)
- A. Failover strategies for high availability
- B. Read/write splitting
- C. Health checks for nodes
- D. Data encryption
- E. Load balancing
Answer: A,B,C,E
NEW QUESTION 44
From which of the following data sources or databases can Data Lake Analytics (DLA) read data for analysis?
(Number of correct answers: 6)
- A. OTS
- B. HOLO
- C. Oracle
- D. AnolyticDB
- E. MySQL
- F. MongoDB
- G. OSS
Answer: A,C,D,E,F,G
NEW QUESTION 45
Which of the following statements is NOT correct about the benefits you can gain through PolarDB?
- A. locked backup
- B. Large storage space
- C. Elastic scaling within minutes
- D. Millisecond-level latency in physical replication
- E. When you add a read-only node in an ApsaraDB for PolarDB cluster, you only need to pay for computing resources
Answer: A
Explanation:
Explanation
Lock-free backup.
https://www.alibabacloud.com/help/doc-detail/58768.htm?spm=a2c63.p38356.b99.10.1bcb7338k86bX5
NEW QUESTION 46
DTS (Data Transmission Service) must have access to a database user account on both the target and source database, in order to work.
- A. False
- B. True
Answer: B
Explanation:
Explanation
https://www.alibabacloud.com/help/doc-detail/26652.htm?spm=a2c63.p38356.879954.26.2ab232664Wkc2m#co
NEW QUESTION 47
Which of the following is the core benefit of ApsaraDB for Redis Enhanced Edition (Tair)?
- A. Makes large amounts of data easier to process.
- B. Makes it easy to do business anywhere.
- C. Makes data secure and independently managed.
- D. Makes data accessible online and in real time.
Answer: D
NEW QUESTION 48
What is the maximum storage size that PolarDB currently provides?
- A. 10TB
- B. 50TB
- C. 100TB
- D. 1TB
Answer: C
Explanation:
Explanation
Each PolarDB cluster supports to scale up to 100 TB. https://www.alibabacloud.com/product/polardb
NEW QUESTION 49
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