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Add BC performance knowledge from OptimAL learnings

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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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Jesper Schulz-Wedde 2026-09-25 14:13:37 +02:00
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microsoft/knowledge/performance/prefer-modifyall-over-per-row-modify.md
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@ -15,7 +15,7 @@ application-area: [all]
## Best Practice
Use `ModifyAll` when the loop directly assigns the same value, does not call `Validate`, needs no per-row calculation, and does not depend on `OnModify` unless the equivalent `RunTrigger` value is supplied. Check whether table trigger code, related subscribers, security filtering, `Media`/`MediaSet`, or companion fields force row-by-row fallback (see `triggers-and-media-field-regress-modifyall.md`). A visible loop for progress UX is acceptable only when evidence shows the equivalent bulk call already executes as individual operations and the loop preserves trigger and business semantics.
Use `ModifyAll` when the loop directly assigns the same value, does not call `Validate`, needs no per-row calculation, and does not depend on `OnModify` unless the equivalent `RunTrigger` value is supplied. For a data-only update, exclude rows already holding the target value when that filter preserves the business outcome. Do not skip unchanged rows if the original call's per-row effects are required. Check whether table trigger code, related subscribers, security filtering, `Media`/`MediaSet`, or companion fields force row-by-row fallback (see `triggers-and-media-field-regress-modifyall.md`). A visible loop for progress UX is acceptable only when evidence shows the equivalent bulk call already executes as individual operations and the loop preserves trigger and business semantics.
See sample: [`prefer-modifyall-over-per-row-modify.good.al`](prefer-modifyall-over-per-row-modify.good.al).