Physical Data Model – step-by-step instructions and template SV-11 Template Physical Data Model – step-by-step instructions and template Click the mouse button to see the next slide. Use the browser Back button to return to the Tutorial.

Five Steps in developing your SV-11 Step 1 - Identify the Product's Timescale Decide on the timescale that this product is expected to represent (as-is, to-be, transitional) Multiple timescales are often needed for each product; a separate SV-11 should be produced for each timescale that is needed

Step 2 - Reference Existing Architecture Products Identify the components in your Logical Data Model (OV-7) relevant to the scope of the Physical Data Model. Identify applicable: Entity types Attribute types Relationship types Domain values

Step 2 - Reference Existing Architecture Products, continued … Determine the rules relevant to the scope of the SV-11 Review the operational rules documented in the Operational Rules Model (OV-6a) Review the system rules documented in the Systems Rules Model (OV-10a)

Step 2 - Reference Existing Architecture Products, continued … Identify applicable performance parameters Documented in your System Performance Parameters Matrix (SV-7) Identify Information Exchange Requirements Documented in your Operational Node Connectivity Description (OV-2)

Step 2 - Reference Existing Architecture Products, continued … Reference System Interface Description (SV-1) to identify components applicable to the scope of your SV-11: Systems System elements Systems interfaces System nodes Identify the tools cited in your Overview and Summary (CV-1) product that are pertinent to the development of your SV-11 (such as CASE tools, data dictionary products, etc)

Step 3 - Reassess Tool Selection Decision Re-evaluate the tool decision documented in your Overview and Summary (CV-1) in light of the knowledge of the operational and systems environment gained as a result of producing architectural products Determine whether the initial data model tool(s) decision is appropriate; modify or update this decision as necessary

Step 4 – Decide on Method of Building SV-11 For some purposes, an Entity-Relationship Diagram (ERD) will suffice. A template has been provided at the end of this presentation A Data Definition Language may also be used in the cases where shared databases are used to integrate systems References to message format standards may suffice for message-oriented implementations Descriptions of file formats may be used when file passing is the mode used to exchange information Interoperating systems may use a variety of techniques to exchange data, and thus have several distinct partitions in their Physical Data Model with each partition using a different form

Step 5 – Develop Physical Database Design Determine and document the components of the physical database This includes database schemas to accommodate collection and manipulation of data, performance expectations, security considerations and the maintenance of data integrity Design System Structure Define the procedures based on how the architecture's operational activities will be implemented Define target activities sufficiently to describe the way in which they operate; this provides a common basis for procedure design

Step 5 – Develop Physical Database Design, continued … Design Preliminary Data Structures Summarise data usage from the logical data model and design user codes The specific approach depends upon the database management system that will manage data storage This task defines the data viewed by components of information systems for the purposes of providing definitions for data management software and designing procedures that access the data It also provides a controlled basis for designing storage structures for specific media and computing environments Design Procedures Define dialog procedures, design layouts, system behaviour and procedure actions associated with each procedure

Template An Entity-Relationship Diagram template has been provided, following this slide No templates are provided for Data Definition Language, message format standards or file formats, which are all text-based methods of producing an SV-11 Don’t forget to update your Integrated Dictionary (CV-2) with any new terms or abbreviations introduced in the SV-11 Delete the instruction slides when SV-11 completed

SV-11 Physical Data Model – ERD Template Zero Crow’s Feet – Top, Left, Right and Bottom One and only one (horizontal) Building Blocks One and only one (vertical) One (horizontal) RELATIONSHIP VERB TEXT One (vertical) ENTITY NAME ENTITY NAME ENTITY NAME ENTITY NAME ENTITY NAME Sample Entity-Relationship Diagram SALES REPRESENTATIVE PRODUCT WAREHOUSE STORES SERVES LISTS CUSTOMER PLACES ORDER