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Move canonical knowledge for Microsoft-owned review domains into the Microsoft layer and document the skill/knowledge co-location policy. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com> Copilot-Session: 2a6ea875-d38e-4f30-aadb-0d606f9be231
28 lines
1.8 KiB
Markdown
28 lines
1.8 KiB
Markdown
---
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bc-version: [all]
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domain: performance
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keywords: [setloadfields, partial-record, jit-load, modify, insert, transferfields, write-path]
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technologies: [al]
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countries: [w1]
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application-area: [all]
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---
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# Skip SetLoadFields on write and copy paths
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> Contributions welcome — open a PR to refine or extend this article.
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## Description
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`SetLoadFields` is a read optimization. The platform's [partial-record usage guidelines](https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/developer/devenv-partial-records#usage-guidelines) list the operations that require every field to already be present: `Insert`, `Delete`, `Rename`, `TransferFields`, and copying a record into a temporary table. When those operations run on a partial record, the platform issues a just-in-time load of the missing fields. That extra round-trip costs more than loading the full row on the original `FindSet` or `Get`. Note: `Modify` itself is **not** in this list — a `Modify(false)` that only touches loaded fields is safe with a partial record.
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## Best Practice
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Omit `SetLoadFields` on loops whose body performs a documented full-load operation (`Insert`, `Delete`, `Rename`, `TransferFields`, or assignment into a temporary record) on the same record variable, so the initial read already materializes every field those operations need.
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See sample: `skip-setloadfields-on-write-and-transferfields.good.al`.
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## Anti Pattern
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Calling `SetLoadFields` immediately before a `FindSet` whose body performs `Delete`, `Rename`, `TransferFields`, or copies the record into a temporary table. The review signal is a partial-record setup on a record variable that feeds one of these documented full-load operations in the same iteration.
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See sample: `skip-setloadfields-on-write-and-transferfields.bad.al`.
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