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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/query-results-bypass-primary-key-cache.md
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## Description
The Business Central server caches primary-key `Get` calls within a transaction. Query objects do not use that cache: every `Open`/`Read` goes to SQL. `avoid-get-inside-loop-on-large-table.md` is right when an unbounded inner `Get`/`FindFirst` joins two large sets. It is wrong as a blanket rewrite of repeated `Get` on the same keys. Replacing a cached `Get` with a Query that re-executes per call can be slower. This file exists so reviewers stop treating every `Get` inside a loop as a Query candidate.
The Business Central server caches primary-key `Get` calls within a transaction. Query objects do not use that primary-key cache: reopening a Query per lookup executes the query again; `Read` consumes rows from an open query, not a new query for each row. `avoid-get-inside-loop-on-large-table.md` is right when an unbounded inner `Get`/`FindFirst` joins two large sets. It is wrong as a blanket rewrite of repeated `Get` on the same keys. Replacing a cached `Get` with a Query reopened per call can be slower.
## Best Practice