Rules of Thumb for Software Developers

Fetching Data

• Remember Performance issues go unnoticed during development because the data set is too small - Vlad Mihalcea
• A transaction should fetch only as much data as required by the current executing business logic - Vlad Mihalcea

Optimization

• Premature optimization is the root of all evil - Donald E. Knuth
• Measure performance before and after each attempted optimization. J Bloch
• Programs spend 90 percent of their time in 10 percent of the code.

Design

• The components of design that are most difficult to change after the fact are those specifying interactions between components and with the outside world. Cheif among these design components are APIs, wire-level protocols, and persistent data formats. Bloch
• Strive to write good programs rather than fast ones. J Block