By Chris Loosley
Functionality isn't easily an issue of tuning the code or the computing setting - it begins with designing functionality into the applying from the outset, and spans all levels of the process existence cycle. Drawing on his 25 years of expertise, Chris Loosley explains the foundations of software program functionality engineering and applies them to all aspects of allotted structures structure and layout. alongside the best way, he summarizes his conclusions in over 250 valuable, simply referenced instructions. And he covers all of the key themes, with chapters on Middleware, structure, layout, instruments, Databases, Replication, Warehousing, and Transaction displays. Loosley's conclusions concerning the structure and layout of company structures problem many present middleware tendencies. utilising the functionality ideas, Loosley explains why the most important to making really scalable disbursed platforms is to decompose advanced company functions into multitransaction workflows, and to take advantage of asynchronous information replication, parallel processing, and batching innovations.
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Additional info for High-performance client/server
Whether we refer to this perspective as the individual, user, or application view of performance, it always centers around the elapsed time or response time of a unit of work. " doesn't address the issues. The system manager is concerned with optimizing performance for all of the users—a task that is significantly more complex than optimizing performance for a single user or application, and one that must view the system from a "community" perspective. - 48 - Typical concerns are: • Can our computing resources satisfy the needs of all the users?
Client application Passes request to API 9 9 9 3. API Converts request into data stream 9 9 9 4. Communications Transfers data stream from client to server 9 9 9 5. DBMS server Accepts data stream 9 9 9 9 6. DBMS server Invokes stored procedure 9 9 9 9 7. Stored procedure Executes SQL calls 9 9 9 9 8. Database engine Extracts results 9 9 9 9 - 51 - 9 9 9 9 9 9 Passes data stream to application 9 9 9 13. Client application Displays first results 9 9 9 14. API Handles acknowledgment 9 9 15. Client application Prompts user 9 9 16.
Although some limited implementations of this model are available, they are not in widespread use. Challenging the Gartner Model The Gartner Group model, despite its attractive symmetry, did not really present the issues properly. In an article published in 1993 in Database Programming & Design,§ Paul Winsberg pointed out the following flaws: - 33 - § Paul Winsberg, Database Programming & Design 6(7) (1993). • Distributed processing is not distributed data. • Some designs are more equal than others.