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bcquality/microsoft/knowledge/performance/dataaccessintent-readonly-on-analytical-objects.md
Jesper Schulz-Wedde 4f0a13a801
Promote knowledge for Microsoft review skills (#153) 
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
2026-09-03 15:06:01 +02:00

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bc-version domain keywords technologies countries application-area
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performance
dataaccessintent
read-only
read-scale-out
report
api-page
query
al
w1
all

Set DataAccessIntent ReadOnly on analytical objects

Contributions welcome — open a PR to refine or extend this article.

Description

DataAccessIntent was introduced at runtime 5.0 (BC 16) and has no effect in earlier versions. Reports, API pages (PageType = API with Editable = false), and queries that only read can run against a read replica when DataAccessIntent = ReadOnly. For queries, replica routing only applies when the query is exposed via OData/API; running a query in AL code is unaffected. Without the property these objects hit the primary replica and compete with posting. Agents omit it because the default is read-write and the object "only reads" in AL. The replica routing is a metadata switch, not something the compiler infers from the absence of Modify.

Best Practice

On report objects and PageType = API pages with Editable = false that never write, set DataAccessIntent = ReadOnly. For query objects, set it when the query is consumed via OData or an API endpoint. Keep the default on objects that insert, modify, or call a write codeunit from a processing-only report.

See sample: dataaccessintent-readonly-on-analytical-objects.good.al.

Anti Pattern

A listing report or API query with no DataAccessIntent that scans G/L or sales lines. The object is read-only in practice and still loads the primary.

See sample: dataaccessintent-readonly-on-analytical-objects.bad.al.