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Add BC performance knowledge from OptimAL learnings (#198)

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* Add BC performance knowledge from OptimAL learnings

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

* Address review feedback on performance guidance

Clarify predicate-supporting keys versus covering queries, demonstrate proven cache reuse, and evaluate the updated partial-load and bulk-update rules.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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Jesper Schulz-Wedde 2026-09-29 17:21:28 +02:00 • committed by GitHub
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microsoft/knowledge/performance/use-setautocalcfields-for-per-row-flowfields.md
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@ -15,12 +15,12 @@ application-area: [all]
## Best Practice
Call `SetAutoCalcFields` before `FindSet` when every returned row needs the same FlowField for a comparison, branch, or per-record action. Use `CalcSums` instead when the required result is one aggregate over the filtered set (see `calcsums-instead-of-calcfields-in-loop.md`).
Call `SetAutoCalcFields` before `FindSet` when every returned row needs the same FlowField for a comparison, branch, or per-record action. For one total of a **stored source field**, consider `CalcSums` instead (see [stored-field totals versus FlowFields](calcsums-instead-of-calcfields-in-loop.md)). If the required result is a total of selected FlowField values, derive the underlying source filters from `CalcFormula`; do not sum the FlowField directly with `CalcSums`.
See sample: [`use-setautocalcfields-for-per-row-flowfields.good.al`](use-setautocalcfields-for-per-row-flowfields.good.al).
## Anti Pattern
Calling `CalcFields` inside the loop when every iteration reads the same FlowField. Each `CalcFields` request requires a separate SQL statement unless a compatible recent result is cached. Do not replace row-specific decisions with `CalcSums`; an aggregate cannot preserve which rows met the condition.
Calling `CalcFields` inside the loop when every iteration reads the same FlowField. A compatible recent result can be cached, so do not equate each call with a SQL statement. Do not replace row-specific decisions with `CalcSums`; an aggregate cannot preserve which rows met the condition.
See sample: [`use-setautocalcfields-for-per-row-flowfields.bad.al`](use-setautocalcfields-for-per-row-flowfields.bad.al).