Designing Applications for Performance Appropriate I/O for Specific Task Minimize all Initiation and Termination Design Everything to be “Interactive” Pre-Summarize and Format Data Thin Client/Server is Good, Fat is Bad! Developers Environment vs. End Users Be an End User for a Day!
Appropriate I/O for Specific Task RPG/COBOL (use logical views) Java/SQL (avoid table scans, re-indexing) Wireless (minimize data across network) Client/Server (keep logic near database)
I/O Example (RPG/COBOL)
I/O Example (Java/SQL)
Minimize all Initiation and Termination RPG/COBOL (use data queues, TFRCTL ) Java (minimize QJVACMDSRV, QJVAEXEC ) SQL (limit SQL requests, pull sets of data) Wireless (TCP/IP sockets client/server) Client/Server (keep ODBC connections open) TCP/IP Sockets (multi-threaded connections) ILE C (optimize calls to traditional routines) Data Queues (use w/ triggers, keep files open)
Initiation Example (data queues)
Initiation Example (Java)
Design Everything to be “Interactive” RPG/COBOL (batch is a “short-cut”) Java (mimic “page at a time” sub-files?) SQL (need 10 records, read 10 records) Wireless (store offline lookup tables) Client/Server (limit images, focus on function) TCP/IP Sockets (keep active, good recovery) ILE C (IBM Dynamic Screen Manager) Data Queues ( QSNDDTAQ, QRCVDTAQ )
Interactive Example (Java/SQL)
Interactive Example (ILE-C)
Pre-Summarize and Format Data RPG/COBOL (normalize, transaction processing) Java (de-normalize for performance) SQL (pre-summarize for instant static totals) Wireless (subset rows/columns for small devices) Client/Server (re-format on server, pull to client) Data Queues (w/ triggers, real-time summaries)
Thin Client/Server is Good, Fat is Bad! RPG/COBOL (limit ILE program size) Java (thin client, reasonable server) SQL (stored procedures, small data-sets to client) Wireless (thinnest client or it WON’T WORK!!) Client/Server (fat client, not a feature to promote)
Developers Environment vs. End Users Developers with SUPER machines and 10 transactions in the order detail file End Users with older machines and 10,000,000 transactions in the order detail file Single biggest reason for poor performance!!
Be a User for a Day! Experience what it is like to run your application on a 4 year old PC How long does it take you to enter a transaction? How do the features and functionality really work! Receive first hand feedback on performance and functionality concerns Gain a sense of appreciation for end-user complaints
Q&A To receive MB Software’s FREE performance evaluation: 1. Register at 2. Download and install software on AS/ Call (800) to schedule your free performance review session What To Expect: After allowing performance data to accumulate for one full business day, you will log into a secure area of MB Software’s Web site. We will then have a conference call to discuss our findings and how you can gain performance improvements with your existing applications. Analyzing existing workload and applications can do a great deal in showing what to mimic and what to improve in new applications. It’s that easy! Questions & Answers