Data Management Issues in Electronic Commerce

Data Management Issues in Electronic Commerce

M. Tamer ÖzsuDepartment of Computing Science

University of Alberta

What are the issues?

• Catalog development

• Intelligent querying

• Workflow management

• EC transaction atomicity

• Management of distribution and heterogeneity

Smart and Virtual Catalogs• Smart Catalog

– Searchable, annotated combinations of machine-readable (i.e., minimally processable) and machine-sensible (i.e., actually understood by computer) product data

• Virtual Catalog– Systems that dynamically retrieve information from multiple

smart catalogs and present these product data in a unified manner with their own look and feel, not that of the smart catalog

A. Keller, “Smart Catalogs and Virtual Catalogs”, In Readings in Electronic Commerce, R. Kakakota and A.B. Whinston (eds.), 1997, pp. 259-274.

Issues and Challenges

• Fully multimedia catalogs– Existing catalogs are mostly text-based virtual

catalogs with embedded images– Add more support for modeling images for

similarity searches– Add audio and video to provide product

demonstrations, voice-overs and even commercials– Structured document databases (SGML,XML) +

image databases + continuous media systems

Issues and Challenges

• More open virtual catalog environment – Single-vendor or proprietary virtual catalogs– “open” to more flexible integration of various

vendor catalogs

• Distribution– move to the Internet environment scalability

• provide search capabilities– Browsing-based access; limited search

EC Transactions

• Electronic commerce consists of processes which can be modeled as workflows.

• Workflow: “A collection of tasks organized to accomplish some business process.”

[D. Georgakopoulos]

Workflow Types• Human-oriented workflows

• Involve humans in performing the tasks.• System support for collaboration and coordination; but no system-

wide consistency definition

• System-oriented workflows• Computation-intensive & specialized tasks that can be executed by a

computer• System support for concurrency control and recovery, automatic task

execution, notification, etc.

• Transactional workflows• In between the previous two; may involve humans, require access to

heterogeneous, autonomous and/or distributed systems, ACID properties

Workflow Example

T1: Search vendor catalog T4: Send shipping instructionsT2:Place the order T5: Pay invoiceT3:Receive proforma invoice T6: Receive goods

T1 T2

T3

T4

T5

VendorCatalog

OrderDatabase

AccountsDatabase

T6

EC Transaction Atomicity

• “EC transaction” has a slightly different meaning– refers to the actual transaction of exchanging

goods for money

• Atomicity of this type of transaction is important

Atomicity Types

• Money atomicity– transfer of funds from one party to another without the

possibility of the creation or destruction of money

– Cash transaction

• Goods atomicity– Money atomicity + exact transfer of goods for money

– COD transactions

• Certified delivery– Goods atomicity + both the merchant and the customer can

prove exactly what goods were delivered

NetBill

Customer Merchant

NetBill Server

(1) Payment order

(2)PO+

invoice

(3)Approval

(4) Delivery of goods

Intelligent Querying

• Passive queries– “Find me all Montblanc fountain pens whose

price is < $500.”

• Active queries– “Whenever a Montblanc fountain pen of 1920’s

vintage becomes available for under $1000, let me know.”

– Agent technology

Issues

• Distribution

• Heterogeneity

• Autonomy

• Openness to Internet