oracle rollback是回滚整个数据库还是回滚某个用户的 *** 作

Rollback是指一个用户在某一次事务提交之前的回滚，使得本次的 *** 作无效。

SQL> Insert into T_GHDWML Values('G31003','哈尔滨自然公司','哈自然','郑毅','13936656561');

SQL> Savepoint A;

SQL> Update T_GHDWML set lxr='陈宇' where dwbm=’G31003’;

SQL> Savepoint B;

SQL> Delete From T_GHDWML where dwbm=’G31003’;

SQL> Rollback;

SQL> Rollback;

SQL> Rollback;

数据是存放在数据文件中的，不是直接写在物理硬盘上，数据文件是无法自动缩小的，分配了多大就是多大，用下面的sql可以查出表空间的具体使用情况，删了大量数据后应该有一个或几个表空间出现大量空闲。

数据库是“按照数据结构来组织、存储和管理数据的仓库”。是一个长期存储在计算机内的、有组织的、可共享的、统一管理的大量数据的集合。

扩展资料：

数据库是一个按数据结构来存储和管理数据的计算机软件系统。数据库的概念实际包括两层意思：

（1）数据库是一个实体，它是能够合理保管数据的“仓库”，用户在该“仓库”中存放要管理的事务数据，“数据”和“库”两个概念结合成为数据库。

（2）数据库是数据管理的新方法和技术，它能更合适的组织数据、更方便的维护数据、更严密的控制数据和更有效的利用数据。

B 考查分词用法。Date back to追溯到…这个短语没有进行时，也没有被动。与the church构成主动关系。句意：追溯到14实际的这座教堂，现在仍然被保护得很好。

英语三级2008年12月的英语试题，每个大题的答案附在每个答题后面。

Part II Vocabulary & Structure

Section A

16 Allan is looking forward to _______ the trade fair

A) meet

B) meeting

C) be meeting

D) having met

17 The sales manager had his secretary ________ a pressconference for their new products

A) arrange

B) to arrange

C) have arranged

D) arranged

18 The message ________ Mr Black was elected chairmanof the committee arrived just in time

A) which

B) what

C) that

D) how

19 They had talked only for a few minutes ________ theyfound they were of different opinions

A) unless

B) while

C) before

D) once

20 By the time you month, I ________ my term paper

A) have completed

B) complete

C) am completing

D) will have completed

21 It is important to provide an environment ________people are encouraged to make suggestions at all levels of the company

A) from which

B) on which

C) in which

D) for which

22 The scientists wanted to keep people ________ aboutthe breakthrough in their experiment

A) inform

B) informed

C) informing

D) to inform

23 When I first arrived in Japan, I was surprised________ the way people greeted each other

A) of

B) to

C) with

D) at

24 Not until that day ________ the importance of goodmanners in a job interview

A) did I realize

B) I did realize

C) I have realized

D) have I realized

25 The market economy is quickly changing people’s ideaon ________ is accepted

A) that

B) which

C) what

D) how

Section B

26 He tried to solve the problem, but he (quick)________ gave up

27 The guest paid (little) ________ money than heshould for the room

28 It is far more (interest) ________ for me to chatonline with friends than to watch TV

29 Finally the woman found her (lose) ________ childwith the help of the police

30 a raise in salary because of his excellent (perform)________ at work

31 This hospital, which (equip) ________ with modernfacilities, is one of the best in the country

32 Before (write) ________ an application letter, youshould be aware what kind of people the employer needs

33 In the past few years, traffic problems (become)________ more and more serious

34 It’s really (wonder) ________ to see you here againin Beijing

35 If I (be) ________ you, I wouldn’t miss the jobinterview tomorrow morning

答案：16-20:BACCD 21-25:CBDDC

26quickly 27less 28interesting 29lost 30performance

31equipped 32writing 33have become 34wonderful35were

Part III Reading Comprehension

Task 1

The iMOVE database（数据库） informationplatform for persons interested in job opportunities offered by Germancompanies The information can be obtained in seven languages: German, English,French, Spanish, Chinese, Russian and Arabic

All programs in the area of professional training arecarried out by German training providers All these programs have a clearcontent to meet your special needs

Programs which take place in Germany are carried out inEnglish Many of the German training providers have started their trainingactivities towards the international market Therefore, they also offer coursesabroad These courses are taught in English or the language of the targetcountry Providers will be glad to supply you with additional information onthese courses You can contact the provider directly to find out more about aprogram and the training provider

To guarantee high standards in the database, iMOVE hasdeveloped quality standards for training providers and their services All ofthe training facilities in the iMOVE database have to follow these qualitycriteria (标准) All training providers whopublish their international training programs in the iMOVE database haverecognized our General Terms and Conditions

36 The iMOVE database is intended for persons who________

A) seek a job as a language translator

B) are interested in the German language

C) want to be employed by German companies

D) wish to work for professional training providers

37 The iMOVE programs are carried out by ________

A) language training centers

B) German training providers

C) special service developers

D) overseas employment advisers

38 held in Germany are taught in _________

A) German

B) English

C) French

D) Chinese

39 Which of the following measures has iMOVE taken toguarantee its high standards

A) Offering different language courses

B) Providing modern training facilities

C) Starting training courses overseas

D) Developing quality standards

40 The purpose of the passage is to ________

A) advertise the iMOVE database

B) make German companies more popular

C) hire overseas employees to work in Germany

D) encourage people to learn more foreign languages

Task 2

It is so easy to earn rewards!

A wide range of partners wherever you go

To make traveling even easier, Air France offers youFrequency Plus through anextensive network of our partners Together, they give you endlessopportunities to earn Miles and a wide choice of Rewards, from airline tickets,hotel room-nights, car rentals and more

Partners in China

If you are a Frequency Plus member registered in China,you have even more choices with rewards from our local partners For moreinformation, please contact your local Air France office

First rewards start as low as 20,000 Miles!

Your Temporary Card

that will make you get your first Reward, now

a) Show your Temporary Card and simply give your Cardnumber when making a reservation and at check-in for your flight In this way,you will begin to earn Miles even before receiving your Permanent Card

b) Fill in and return your personal membership (会员) application today Your application must be receivedwithin 3 weeks of your first flight

Remember, you will enjoy an extra 3,000 Bonus Miles (额外奖励里程) for your first trip with Air France within 6 months ofjoining Fly today and earn Rewards sooner!

41 Air France carries out its Frequency Plus ________

A) through its reduced ticket prices

B) through its extensive network of partners

C) by providing convenient flight schedules

D) by offering excellent services on board

42 In order to get the first reward, passengers mustfly at least ________

A) for 6 months

B) 20,000 miles

C) 3,000 bonus Miles

D) once in three weeks

43 Passengers can begin to earn Miles ________

A) if they reserve tickets at a hotel

B) if they buy tickets at the airport

C) before receiving the Permanent Card

D) after receiving the Permanent Card

44 Passengers should send their application to AirFrance ________

A) upon receiving the application form

B) within 3 weeks of their first flight

C) before their first flight with Air France

D) within 6 months of joining the program

45 The extra bonus Miles for a passenger’s first tripwith Air France within 6 months of joining is ________

A) 2,000 miles

B) 3,000 miles

C) 20,000 miles

D) 30,000 miles

答案：36-40:CBBDA 41-45:BBCBB

Task 3

The College of Business Management (CBM) is seeking newmembers to represent the college as Student Ambassadors (大使) will represent the college during the school yearTheir term of service will begin during the autumn Student Ambassadors willhave the opportunity to cooperate with students at various activitiesthroughout the school year

Purposes:

1 Promote the College of Business Management

2 Improve leadership and communication skills

3 Assist in the recruitment of students to CBM

Qualifications and Requirements:

1 Must currently be a full-time student in the Collegeof Business Management

2 Must be available to assist with various recruitmentactivities

3 Must be able to contact students from variousbackgrounds

Application Procedure:

1 Print a copy from our website

2 Complete the application form and return it to theStudent Advising Office

For More Information:

Contact Mark Davis at 472-2310 or stop by the StudentAdvising Office

Student Ambassadors Wanted

Term of service: throughout the school year

Tasks:

答案：46college47various activities 48communication 49full-time 50Student Advising Office

Part IV Translation-- English into Chinese

61 , training and personal qualities meet the requirements you set forthe position of electrical engineer

A) 我认为我受的教育和培训，以及个人素质正是你们要求的，我会努力履行电气工程师的职务。

B) 我相信我所接受的教育和培训，以及我的个人素质均符合你们对电气工程师职务设定的要求。

C) 得知你们招聘电气工程师，我觉得我的背景可以让你们了解我受过的教育和培训，以及我的个人品德。

D) 得知你们招聘电气工程师，和培训，完善我的个人品质，成为一名电气工程师。

62 As you have done the market survey, I would like to discuss with youthe possibility of selling our products in the US

A) 因为美国产品有市场，所以我们要研究开发我们产品的可能性。

B) 因为你有市场资料，所以我希望与你讨论美国产品的销售情况。

C) 你已经作了市场调查，所以我想和你讨论在美国销售我们产品的可能性。

D) 你已了解了市场，因此我希望能与你商讨在美国开发我们产品的可能性。

63 The general manager public relations person as well as the head ofthe company’s management

A) 总经理不仅要当好公关人员，而且要领导好公司。

B) ，也一定要当好公司的领导。

C) 总经理不仅是公司的管理首脑，还必须起某种公关人物的作用。

D) 总经理要管理好自己的公司，首先必须管理好公司的公关人员。

64 The study shows that our computers are superior to those of ourcompetitors in terms of functions and speed

A) 研究表明，我们的计算机在功能和速度两方面都优于我们的竞争对手。

B) 研究表明，我们的计算机与我们竞争者的产品在功能和速度方面有差异。

C) 研究表明，我们的计算机在效率和速度方面都与其它厂商不同。

D) 研究表明，我们的计算机正面临着高速发展的其它厂商的竞争。

65 Movie-goers (**院常客) across China will now only pay half price fortickets Tuesday, which will start in July Any movie shown on Tuesday will behalf price, even for new movies The purpose is to bring people back to thecinema on Tuesday, when numbers of audiences are the lowest of the week Somecinemas in Beijing and Shenzhen that began in advance have seen an increase inaudiences Tuesday evenings

答案：61-64:BCCA 65从七月开始，中国的**院常客们每周二花半价就可以去**院看**。任何在周二上映的**，即使是新**也是半价。周二是一周中观众最少的一天，在这一天实行半价政策，是为了将人们带到影院。这项措施已经在北京和，这些影院周二晚上的观众数量都有所增加。

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