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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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4
microsoft/knowledge/performance/avoid-get-inside-loop-on-large-table.md
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@ -1,7 +1,7 @@
---
bc-version: [all]
domain: performance
keywords: [n-plus-one, get, findfirst, loop, inner-lookup, large-table]
keywords: [n-plus-one, get, findfirst, loop, inner-lookup, large-table, item-get, query]
technologies: [al]
countries: [w1]
application-area: [all]
@ -15,7 +15,7 @@ A `Get` or `FindFirst` against another persistent table inside a loop can produc
## Best Practice
Use a query object to join the outer and inner tables when the relationship and filters can be expressed as one query. If keys repeat, a dictionary cache can reduce lookups to one per distinct key. `SetLoadFields` can reduce the columns transferred by unavoidable inner reads, but it does not eliminate the N+1 shape and must not be presented as doing so.
Use a query object to join the outer and inner tables when the relationship and filters can be expressed as one query. If complete lookup keys repeat and the result remains valid, a [scoped cache](cache-repeated-filtered-results-with-explicit-scope.md) can reduce lookups to one per distinct key; do not assume primary-key `Get` calls each hit SQL (see [transaction caching](primary-key-get-in-loop-is-transaction-cached.md)). `SetLoadFields` can reduce the columns transferred by unavoidable inner reads, but it does not eliminate the N+1 shape and must not be presented as doing so.
See sample: [`avoid-get-inside-loop-on-large-table.good.al`](avoid-get-inside-loop-on-large-table.good.al).