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单选题 The log is a sequence of log records recording all the update activities in the database. Whenever a transaction performs a write, it is essential that ______

A. the log record for that write be created and added to the log, after the database is modified

B. the log record for that write be created and added to the log, before the database is modified

C. the log record for that write be created and added to the log, as soon as the database is modified

D. the log record for that write be created and added to the log, time is not important

数据库原理及应用课程封面

学科：数据库原理及应用

时间：2023-11-25 09:11:05

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题目1
单选题
Ensuring the atomicity and durability properties of a transaction is the responsibility of the database system itself, specifically of the ______
A. Concurrency-control managerB. Recovery managerC. Integrity managerD. Buffer manager
题目2
单选题
When a system crash occurs, redoing/undoing all transactions recorded in the log can be very slow. Streamline recovery procedure by periodically performing ______
A. Share-lockB. loggingC. DeadlockD. Checkpointing
题目3
单选题
The log is a sequence of log records recording all the update activities in the database. Whenever a transaction performs a write, it is essential that ______
A. the log record for that write be created and added to the log, after the database is modifiedB. the log record for that write be created and added to the log, before the database is modifiedC. the log record for that write be created and added to the log, as soon as the database is modifiedD. the log record for that write be created and added to the log, time is not important
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