设有某社交网站，在系统的实施或运维过程中，有下列活动：
Ⅰ．在系统运行过程中，根据网站用户的增长情况，密切监控数据库空间的增长量
Ⅱ．在系统运行过程中，对系统的各数据库服务器在各个时段的CPU和内存使用情况进行监控
Ⅲ．修改数据库结构及相关的应用程序，使用户发的帖子中能加载图片或视频
Ⅳ．密切监视每一个帖子，删除侵权帖子
Ⅴ．制定备份计划，进行数据备份
Ⅵ．查找并删除系统中的广告帖
以上活动，一般情况下应由DBA执行的工作是（）。
A．仅Ⅰ、Ⅱ和Ⅴ
B．仅Ⅰ和Ⅱ
C．仅Ⅰ、Ⅱ、Ⅲ和Ⅴ
D．全是
参考答案：C
解析：
一般来说，由数据库管理员(DBA)执行的工作包括：
①数据库的转储和恢复。
②数据库的安全性和完整性控制。
③数据库性能的监控分析和改时。
④数据库的重组和重构。
该题干中，Ⅰ、Ⅱ属于③，Ⅲ属于④，Ⅴ属于①。
| 用方框中所给词的正确形式填空，使短文内容完整。注意有两个词是多余的。 | |
Before Spring Festival comes, people go out to buy things, 1 as meat, chicken, fruit, sweets and new clothes. They 2 their houses and decorate them. The Chinese character "fu" is a must. It is 3 upside down, which means "fu" comes. The celebrations begin on the eve of the lunar New Year. The family get 4 for a big dinner, If a person is far from home, he or she will always 5 to get home for it. After the dinner, the whole family will get together, chat and 6 TV. During the holidays, they go to visit 7 and friends and exchange New Year greetings. They sit around talking and eating 8 , cakes and all kinds of delicious food. Every family prepares 9 special. Each child will get money as a New Year gift. People in the north often eat dumplings for breakfast while the 10 people often eat niangao. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. |