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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
1.3 KiB
Markdown
28 lines
1.3 KiB
Markdown
---
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bc-version: [all]
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domain: performance
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keywords: [changecompany, loop, cache, multi-company, isolation]
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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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# Do not call ChangeCompany inside a per-row loop
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> Contributions welcome — open a PR to refine or extend this article.
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## Description
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`ChangeCompany` retargets a record variable to another company's data and drops the in-memory caches bound to the previous company. Calling it once per row in a multi-company scan therefore pays a cache reset on every iteration, even when consecutive rows share a company. Agents treat `ChangeCompany` like a filter. It is an isolation switch.
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## Best Practice
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Group work by company. Call `ChangeCompany` once per distinct company, then `FindSet`/`Get` that company's rows. If the record variable is reused afterward, call `ChangeCompany()` without a company name to redirect it back to the current company.
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See sample: `changecompany-in-loop-drops-caches.good.al`.
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## Anti Pattern
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`repeat Rec.ChangeCompany(Buffer.Company); Rec.Get(Buffer."No."); until Buffer.Next() = 0` when `Buffer` is not ordered by company, or even when it is — if `ChangeCompany` still runs every row. The signal is `ChangeCompany` inside `repeat`/`while` keyed by a document line rather than by a company loop.
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See sample: `changecompany-in-loop-drops-caches.bad.al`.
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