问题 单项选择题

事务的持久性是由数据库管理系统中的哪个部件负责

A.恢复管理

B.并发控制

C.完整性约束

D.存储管理

答案

参考答案:A

解析: 数据库管理系统中,为了保证事务的正确执行,维护数据库的完整性,要求数据库系统维护以下事务特性,即原子性、一致性、隔离性和持久性。事务的原子性是指事务的所有操作要么全部正确反映出来,要么不反映;事务的一致性是事务的隔离执行保持数据库的一致性;事务的隔离性是指尽管多个事务可以并发进行,但要使每个事务都感觉不到系统中其他事务在并发进行;事务的持久性是指一个事务成功完成后,它对数据库的改变必须是永久性的,即使系统可能出现故障.这4个特性都要有相关的机制保证,确保持久性的是数据库管理系统中的恢复管理部件的责任。正确答案为选项A。

阅读理解

Picasso, the famous Spanish painter, was born in 1881. His father was an art teacher. Picasso began to paint very early. He was admitted to the Royal Academy at the age of 15. After 1900, he spent much time in Paris, living there from 1904 to 1947, when he moved to the south of France.

Throughout his career, Picasso moved from style to style with ease. He practiced sculpture, illustrated books and also showed great interest in pottery design and other fields of art.

Picasso produced a great number of drawings during his lifetime. No later artist of the School of Paris has replaced him in international influence.

Picasso is generally considered to be the foremost figure in 20th century French art. His paintings are now exhibited in leading European and American galleries.

小题1:The main idea of the passage is ______.

A.Picasso is considered to be the foremost figure in the French art

B.Picasso is a famous Spanish painter

C.Picasso spent much time in Paris, living there from 1904 to 1947

D.Picasso’s life and art小题2: According to the writer, Picasso was ______.

A.more important than any other French artist in international influence

B.more important than any other Spanish artist in international influence

C.the most important figure in Spain

D.the most important figure in France小题3: How long did he stay in Spain and France?

A.Over 19 years in Spain and the rest life in France.

B.15 years in Spain and 43 years in Paris.

C.15 years in Spain and the rest life in Paris.

D.He did not stay so long in Pads than in Spain.小题4: Picasso moved from style to style with ease. It means ______.

A.he did not like only one style

B.he changed his style without difficulty

C.he liked not only sculpture, but also pottery design

D.he showed great interest in other fields of art

单项选择题 共用题干题