SAP Performance tuning
Performance tuning keeps SAP fast and scalable by finding and fixing bottlenecks across the database, application server and custom code. It is a measurement-driven discipline, never guesswork.
SAP performance work starts by measuring. Baseline with ST03 workload analysis, drill to the worst offenders, trace the cause with ST05 SQL trace or SAT runtime analysis and ST04 or HANA plan analysis, fix one thing, then measure again. The usual causes are expensive SQL, missing indexes, SELECT-in-loop custom ABAP and under-sized buffers. On HANA, push logic down.
- Watch out: Tuning without measuring.
Where performance is won or lost
- Database: expensive SQL, missing indexes, outdated statistics (usually the first bottleneck).
- Custom ABAP: SELECT-in-loop, SELECT *, nested loops on big tables.
- Buffers/memory: under-sized program/table buffers.
- Work processes: wrong mix/number for the workload.
The tuning toolkit
- ST03 workload analysis.
- ST05 SQL trace; SAT/ST12 runtime analysis.
- ST04 / HANA plan analysis.
- SM50/SM66 work-process monitoring.
The method
Always measure first: baseline with ST03, drill to the worst offenders, trace the cause, fix one thing (usually bad SQL/code or an index), and re-measure. On HANA, push logic to the database and avoid row-by-row processing.
Common pitfalls
- Tuning without measuring.
- Ignoring custom-code SQL.
- Under-sized DB/buffers.