2 September 2008CIS 340 # 1 Topics tiersTo characterize the architecture of tiers 1-tier 2-tier 3-tier n-tier To define the communication needs to support the architectures 2 September 2008CIS 340 # 2 Information System Layers Delivery and format Business rules, logic, processes Arranges and implements data sources 2 September 2008CIS 340 # 3 Information Architecture The description and models of the IS to achieve the Strategic, Tactical, and Operational efforts of the organization Technology Architecture Hardware Application Architecture Software Data Architecture Data / InformationDef: ...An architecture identifies the components of a problem space, shows the relationships among them, and defines the terminology, rules, and constraints on the relationships and components. Britton & Bye, p. 5 2 September 2008CIS 340 # 4 Top-Down Design 2 September 2008CIS 340 # 5 Top-Down Design to Architecture PL presentation layer AL application layer RM resource management layer 2 September 2008CIS 340 # 6 Bottom-Up Design 2 September 2008CIS 340 # 7 Bottom-Up Design to Architecture 2 September 2008CIS 340 # 8 1-Tier Architecture 2 September 2008CIS 340 # 9 2-Tier Architecture 2 September 2008CIS 340 # 10 2-Tier Architecture Abuse 2 September 2008CIS 340 # 11 3-Tier Architecture 2 September 2008CIS 340 # 12 3-Tier Architecture -- Instantiation 2 September 2008CIS 340 # 13 N-Tier Architecture 2 September 2008CIS 340 # 14 N-Tier Architecture Ad Infinitum Database in E-business 2 September 2008CIS 340 # 15 2 September 2008CIS 340 # 16 EX: Distributed Database Management Systems Progression 2 September 2008CIS 340 # 17 EX: Distributed Database Management Systems... p 2/2 2 September 2008CIS 340 # 18 Distributed Database Management Systems Some level of heterogeneous support exists, but with restrictions For instance: Read-only, not write privileges Number of accessible tables Number of separate databases Variation in data model connections 2 September 2008CIS 340 # 19 Assignment... For Thursday Discussion: Jot down comments about your current awareness of the terms: Communications Middleware Examine DDBMS advantages & disadvantages table (Table 12.1, p. 458) Connect the (+/-)-list to aspects of communications, connectivity 2 September 2008CIS 340 # 20 2 September 2008CIS 340 # 21 2 September 2008CIS 340 # 22 2 September 2008CIS 340 # 23 2 September 2008CIS 340 # 24 2 September 2008CIS 340 # 25 2 September 2008CIS 340 # 26 2 September 2008CIS 340 # 27 Currently, no DDBMS provides full support for fully heterogeneous environment