问题 问答题 案例分析题

数据中心建设

某大型企业在全国各城市共有40个左右的分支机构,这些机构已经建设了基于大型关系数据库的信息管理系统,每天负责独立地处理本区域内的业务,并实时存储业务数据。

每个机构的数据库服务器从PCServer(最小512MB内存)到RISC小型机(最大4GB内存)配置不一,操作系统也不一样,数据库产品类型也不统一。

每个机构平均每天产生约4MB的数据,数据表中包括TEXT字段;每季度一次性产生约100MB的统计和报表数据。

为了加强管理,实现对下属机构业务数据的异地存储备份,保证数据的安全及恢复,同时对全国业务数据进行挖掘分析,该企业拟在总部建设数据中心。数据中心通过公共广域网与各个分支机构组成VPN,每个分支机构到数据中心的逻辑信道带宽为128kbps。

(1)为保证数据上传的顺序、稳定、安全、并发,并解决数据库的异构问题,系统应采用下列哪种技术(请在下列A、B、C、D四个选项中选择)?

A.交易中间件技术

B.Web中间件

C.WebService

D.插装技术

(2)为保证分支机构可靠、高效地向数据中心汇总业务数据,避免单点故障,除了考虑广域网线路采用备份外,在数据中心还应采用什么技术?用100字以内文字说明。

 

答案

参考答案:

(1)交易中间件技术。

(2)数据中心数据库服务器采用多机集群Cluster和数据库并行处理技术,存储设备采用全冗余的SAN结构(或者全冗余的存储结构)。

解析:

问题1主要考查在异构环境下,如何利用现有的成熟技术来解决各个分支机构的   

数据上传到数据中心的问题。   

①交易中间件技术。中间件是介于应用系统和系统软件之间的一类软件,它使用系统软件所提供的基础服务,衔接网络上的应用系统,能够达到资源共享、功能共享的目的。交易中间件是面向交易事务处理的中间件,它负责正确传递交易,对交易完整性进行管理,调度应用程序的运行,保证整个系统运行的高效性。根据X/Open DTP模型,本地交易的管理由数据库系统来完成,交易中间件主要完成分布式计算环境下交易的监控和管理。数据库虽然在本地交易管理的功能已经很强大,但通过广域网进行分布式交易管理并不是数据库的强项,特别是一笔交易涉及异构数据库时更是如此。   

把数据上传看做是交易处理,交易中间件可以满足问题1的要求。有关中间件的更加详细的内容,请读者阅读《系统分析师技术指南》。   

②Web中间件即应用服务器,是实现基于Web应用的中间层平台,不仅是业务逻辑组件的容器,还提供了内容管理、负载均衡、容错、连接池等功能。   

③Web Service是一个崭新的松散耦合的分布式计算模型。每个服务节点利用XML、SOAP、UDDI、WSDL和WSFL等标准,对外提供某类功能,这些服务功能可以通过绑定HTPP和SOAP等技术来访问,从外部使用者的角度来看,Web Service是一种部署在Web上的对象或组件。它是一种面向服务的模型,适合解决分布式计算和处理,不适合应用于数据同步。   

④插桩技术是白盒测试技术的一种。在被测系统中植入测试代码或测试硬件,以捕获系统运行时的可能路径,这种方法称为插桩。插桩技术主要用于系统的覆盖分析。   

为避免数据中心的单点故障,数据中心数据库服务器采用多机集群Cluster和数据库并行处理技术,存储设备采用全冗余的SAN结构(或者全冗余的存储结构)。

问答题


一、审证资料
1.合同资料

SALES CONTRACT

卖方: DALIAN LIGHT ELECTRICAL
Sellers: APPLIANCES CO. , LTD. Contract No: 09SGQ468001
Date: APR. 22, 2009
地址:Signed at: DALIAN
Address: 10 WUSI ROAD, DALIAN, CHINATelex: 86-411-84815229
Fax: 86-411-84815229
Buyers: ASADE TRADING CORP. Telex: ______
Address: AKEDSANTERINK AUTO P. O. BOX 9, FINLAND Fax: ______
This Sales Contract is made by and between the Sellers and the Buyers, whereby the Sellers agree to sell and the Buyers agree to buy the under - mentioned goods according to the terms and eonditions stipulated below:
(1)货号、品名及规格Name of Commodity and Specifications(2)数量Quantity(3)单位Unit

(4) 单位

Unit Price

(5)金额

Amount

HALOGEN FITTING W5009600PCSPCCIF HELSINKIUSD3.60/PCUSD 34560.00
10% more or less both in amount and quantity allowedTotal AmountUSD 34560.00
(6)Packing: 12 PCS IN A CARTON (7) Delivery from DALIAN to HELSINKI (8)Shipping Marks: N/M (9) Time of Shipment:
Within (30) days after receipt of IMC allowing transshipment and partial shipment. (10) Terms of Payment :
By 100% Confirmed irrevocable Letter of Credit in favor of the Sellers to be available by sight draft to be opened and to reach China before MAY 1, 2009 and to remain valid for negotiation in China until the 15th days after the foresaid Time of Shipment. L/C must mention this contract number. IMC advised by BANK OF CHINA, DALIAN BRANCH. All banking Charges outside China (the mainland of China ) are for account of the Draw-ee. (11) Insurance:
To be effected by Sellers for 110% of full invoice value covering FPA up to HELSINKI (12) Arbitration:
All dispute arising from the execution of or in connection with this contract shall be settled amicably by negotiatin. In case no settlement can be reached through negotiation the case shall then be submit China International Eonomic & Trade Arbitration Commision. In Dalian (or in Beijing) for arbitration in act with its sure of procedures. The arbitral award is final and binding upon both parties for setting the Disputes. The fee, for arbitration shall be borne by the losing party unless otherwise awarded.
The Seller (张三) The Buyer (LINA)
2.信用证资料
Issue of Documentary Credit

Issuing Bank : METITA BANK LTD. , FINLAND
Doc. Credit No.: REVOCABLE
Credit Number : LRT0902457
Date of Issue : 090428
Expiry: Date 090412 Place FINLAND
Applicant : ASADE TRADING CO.
AKEDSANTERINK AUTO P. O. BOX 9, FINLAND
Beneficiary : DALIAN LIGHT ELECTRICAL APPLIANCES CO. , LTD.
10 WUSI ROAD, DALIAN, CHINA
Amount: USD 3 456.00 (SAY US DOLLARS THIRTY FOUR
THOUSAND FIVE HUNDRED AND SIXTY ONLY)
Pos./Neg. Tol. (%) : 5/5
Available with/by : ANY BANK IN ADVISING COUNTRY BY NEGOTIATION
Draft at… : DRAFTS AT 20 DAYS’ SIGHT FOR FULL INVOICE VALUE
Partial Shipments : Not Allowed
Transshipment : Allowed
Loading in Charge : Dalian
For Transport to : HELSINKI
Shipment Period: AT THE LATEST MAY 30, 2009
Descript. of Goods : 960PCS OF HALOGEN FITFING W500, USD6. 80 PER PC AS
PER SALES CONTRACT 09SG468001 DD 22, 04, 09 CIF HESINKI
Documents Required : * COMMERCIAL INVOICE 1 SIGNED ORIGINAL AND 5 COPIES
* PACKING LIST 1 SIGNED ORIGINAL AND 5 COPIES
* FULL SET OF CLEAN ON BOARD MARINE BILLS OF LAD-
ING, MADE OUT TO ORDER, MARKED" FREIGHT PRE-
PAID" AND NOTIFY APPLICANT (AS INDICATE ABOVE)
* GSP CERTIFICATE OF ORIGIN FORM A, CERTIFYING GOODS
OF ORIGIN IN CHINA, ISSUED BY COMPETENT AUTHORITIES
* INSURANCE POLICY/CERTIFICATE COVERING ALL RISKS
AND WAR RISKS OF PICC. INCLUDING WAREHOUSE TO
WAREHOUSE CLAUSE UP TO FINAL DESTINATION AT
HELSINKI, FOR AT LEAST 120 PCT OF CIF-VALUE.
* SHIPPING ADVICES MUST BE SENT TO APPLICANT WITH-
IN 2 DAYS AFTER SHIPMENT, ADVISING NUMBER OF
PACKAGES, GROSS & NET WEIGHT, VESSEL NAME, B/L
NO. AND DATE, CONTRACT NO. , VALUE.
Presentation Period : 5 DAYS AFTER ISSUANCE DATE OF SHIPPING DOCUMENT
Confirmation : WITHOUT
INSTRUCTIONS : THE NEGOTIATION BANK MUST FORWARD THE DRAFTS
AND ALL DOCUMENTS BY REGISTERED AIRMAIL DIRECT
TO US IN TWO CONSECUTIVE LOTS. UPON RECEIPT OF
THE CRAFTS AND DOCUMENTS IN ORDER. WE WILL RE-
MIT THE PROCEEDS AS INSTRUCTED BY THE NEGOTIAT-
ING BANK.
二、审证要求
根据销售合同审核上述信用证内容,找出信用证内容的不符点,并在下面详细列出:
1._________________________________
2._________________________________
3._________________________________
4._________________________________
5._________________________________
6._________________________________
7._________________________________
8._________________________________
9._________________________________
10._________________________________
11._________________________________
12._________________________________
13._________________________________
14._________________________________

单项选择题