The performance complaint

MEASURED, DIAGNOSED and ANSWERED WITH EVIDENCE — including THE POSSIBILITY THAT IT IS NOT THE DATABASE. Now the complaint, with a recoverable and observable estate underneath it — which is what makes investigating it safe. START WITH MODULE 11 LESSON 2'S FOUR QUESTIONS, BEFORE ANY TOOL. Who, doing what, since when, compared to what. On an inherited estate the fourth is the hard one, because there is no baseline — so the honest first finding may be that nobody can say whether this is a change or how the system has always been. THEN RULE THE DATABASE IN OR OUT, WITH MODULE 17 LESSON 2'S SEQUENCE. Ten minutes, three numbers, and evidence somebody else can reproduce. Do this early even though the complaint arrived as "the database is slow" — and be genuinely open to the answer, because on an estate you did not build the network, storage and client…

In this module: Module 18 · Capstone: a system handed over

1. 1The brief
2. 2Establishing what you have
3. 3Making it recoverable
4. 4Making it observable
5. 5The performance complaint
6. 6The handover