Which migration modes are supported by DTS (Data Transmission Service)? (Number of correct answer: 3)

• A.From Alibaba Cloud RDS to other database systems
• B.From RDS to an ECS-based database
• C.From a different cloud provider to Alibaba Cloud
• D.From an RDS database, back to itself

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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.50%
• B.40%
• C.70%
• D.60%

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

• A.The three-node Enterprise Edition architecture, which ensures zero data loss
• B.The high-avail ability architecture, in which primary and read-only nodes are deployed to implement automatic failovers
• C.The single-node Basic Edition architecture, which can be used in test and non-core production environments
• D.The serverless architecture, in which computing resources are charged based on the Pay-As-You-Go (PAYG) billing method

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

• A.Level-1 backup
• B.Level 1 backup + Redo log
• C.Level-2 backup
• D.Level-2 backup + Redo log

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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

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