Troubleshooting and stream query coding guidelines

Apama 10.15.0 | Developing Apama Applications | Developing Apama Applications in EPL | Working with Streams and Stream Queries | Troubleshooting and stream query coding guidelines

Troubleshooting and stream query coding guidelines

Prefer on statements to from statements

Know when to spawn and when to partition

Filter early to minimize resource usage

Avoid duplication of stream source template expressions

Avoid using large windows where possible

In some cases prefer retain all to a timed window

Prefer equi-joins to cross-joins

Be aware that time-based windows can empty

Be aware that fixed-size windows can overflow

Beware of accidental stream leaks

This section provides high-level guidelines for writing stream query applications that implement best practices.