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

• A.PostgreSQL
• B.SQL Server
• C.MySQL
• D.MongoDB
• E.MariaDB
• F.HBase
• G.Oracle
• H.TSDB
• I.Redis

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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?

• A.PolarDB MySQL
• B.PolarDB PosgreSQL
• C.PolarDB Oracle
• D.PolarDB Box

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What is the maximum number of read-only nodes in a PolarDB cluster?

• A.15
• B.10
• C.5
• D.1

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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.Point-in-time restore
• B.Pase
• C.High concurrency optimization
• D.Slot failover
• E.Ganos

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Which of the following are database architectures which have emerged during the evolution of database systems? (Number of correct answers: 3)

• A.Shared Nothing
• B.Shared Everything
• C.Dedicated
• D.Single Instance

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