违法和不良信息举报 联系客服
免费注册 登录

Full Atomicity, Consistency, Is

题目

Full Atomicity, Consistency, Isolation, Durability (ACID) compliance is a necessity for a new application, which heavily reads and writes data. This requires the following config file options: Sync_binlog=1 Innodb_flush_log_at_trx_commit=1 Innodb_doublewrite=1 However, this configuration is expected to introduce disk I/O overhead. What three changes will reduce disk I/O overheads?（）

  • A、Use of soft links for database directories on the same physical disk
  • B、Use of delay_key_write=ON for batch index update
  • C、Allocation of RAM to the buffer pool such that more of the data can fit in RAM
  • D、Placement of InnoDB log files and datadir on separate physical disks
  • E、Use of separate directories on the same physical disk for log files and data files
参考答案和解析
正确答案:B,C,D
如果没有搜索结果或未解决您的问题，请直接 联系老师 获取答案。
相似问题和答案

第1题：

紧急后退三。

A.Full astern！

B.Double full astern！

C.Emergency full astern！

D.Emergency three astern！


正确答案：C

第2题：

Full Atomicity, Consistency, Isolation, Durability (ACID) compliance is a necessity for a new application, which heavily reads and writes data.This requires the following config file options: Sync_binlog=1 Innodb_flush_log_at_trx_commit=1 Innodb_doublewrite=1 However, this configuration is expected to introduce disk I/O overhead.What three changes will reduce disk I/O overheads?（）

A.Use of soft links for database directories on the same physical disk

B.Use of delay_key_write=ON for batch index update

C.Allocation of RAM to the buffer pool such that more of the data can fit in RAM

D.Placement of InnoDB log files and datadir on separate physical disks

E.Use of separate directories on the same physical disk for log files and data files


参考答案：B, C, D

第3题：

The cervix secrets mucus, the consistency of which varies with the stages in her menstrual cycle. ()

此题为判断题(对，错)。


参考答案：正确

第4题：

事务管理的特性叙述不正确的是

A.事务管理特性包括：（1）原子性、（2）一致性（Consistency）（3）隔离性（Isolation）、（4）持续性（永久性）（Durability）
B.原子性（Atomicity）是指数据库的逻辑工作单位。
C.隔离性（Isolation）是指可以被其他事务干扰。
D.持续性（永久性）（Durability）是指一旦提交，改变就是永久性的

答案：C
解析：

第5题：

事物的ACID特性中C的含义是（ ）。A．一致性（consistency）B．邻接性（continuity）C．连续性（continuity）D．并发性（consistency）


正确答案：A
A,Atomicity 原子性，C，Consistency 一致性。I,Isolation, D,Durability, 持久性。

第6题：

事务的ACID特性()

A 原子性(Atomicity)

B 一致性(Consistency)

C 隔离性(Isolation)

D 持续性(Durability )


参考答案ABCD

第7题：

Whichofthefollowingrolesmustbegrantedtoausertoperformafulldatabaseimport?()

A.CONNECT

B.IMP_FULL_DATABASE

C.FULL_EXPORT_PRIVS

D.RESOURCE

E.FULL_IMPORT_PRIVS


参考答案：B

第8题：

在生产者消费者问题中,消费者执行Wait(full)后阻塞的原因是()。

A.full=0

B.full>1

C.full<1

D.full=1


答案：A

解析：生产者运行的同时，消费者也在运行，因为是full=0，导致消费者对full的p操作被阻塞，此时消费者的执行就被阻塞。

第9题：

在数据库加锁技术中，一个事务如果对某一数据项加了排它(exclusive)锁，它将保持此锁直到该事务结束。这是保证事务______特性。

A．原子性(atomicity)

B．一致性或可串行性(consistency or serializability)

C．永久性(durability)

D．隔离性(isolaty)


正确答案：D

第10题：

A transaction is an action,or a series of actions,carried out by a single user or（ ）,that accesses or changes the contents of the database.A transaction should possess the four basic or so-called ACID properties:Atomicity.The“all or nothing”property.A transaction is an（ ）unit that is either performed in its entirety or is not performed at all.Consistency.A transaction must transform the database from one consistent state to another consistent state.Isolation.Transactions execute independently of one another.In other words,the partial effects of（ ）transactions should not be visible to other transactions.Durability.The effects of a successfully completed（committed）transaction are permanently recorded in the database and must not be lost because of a subsequent failure.The four properties above,only（请作答此空）property is the responsibility of the concurrency control subsystem to ensure.It is the responsibility of both the（ ）and the application developers to ensure consistency.To guarantee the Atomicity and Durability properties after a failure,a log file is needed.

A.atomicity
B.consistency
C.isolation
D.durability

答案：B
解析：

更多相关问题
相关内容