Microsoft/bcquality
1
0
Fork 0
mirror of https://github.com/microsoft/BCQuality.git synced 2026-08-06 09:26:52 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions
bcquality/microsoft/knowledge/performance/use-temporary-tables-for-intermediate-data.md
Jesper Schulz-Wedde 9a4198eb28 Add [all] sentinel to bc-version; apply to version-agnostic knowledge 
Most of the corpus — FindSet/SetLoadFields/CalcFields patterns, permission
sets, SingleInstance codeunits, DataClassification, IsolatedStorage,
transaction scope, SecretText — describes BC platform behaviour that is
identical across supported versions. The seed [26..28] range on every
file implied a version-specificity the content does not actually have,
and there was no way to express "applies to every version" in the
schema the way [w1] and [all] already do for countries and
application-area.

Extend the v1 schema with a universal sentinel for bc-version, parallel
to the sentinels already defined for the other dimensions:

  bc-version: [all]         # applies to every BC version

[all] is mutually exclusive with explicit versions. Range shorthand
([26..28]) and explicit lists ([26, 27, 28]) continue to work for files
genuinely tied to a version-gated API or deprecation.

Update read.md (field definition, matching semantics, partial-context
rule), write.md (default to [all], use ranges only with a concrete
reason), README.md (frontmatter example), and the CI validator. All
forty existing knowledge files and the three action skills convert to
[all]; none of the current content is version-gated. Validator passes.
2026-04-23 16:00:03 +02:00

1.3 KiB
Raw Blame History

bc-version domain keywords technologies countries application-area
all
performance
temporary-table
in-memory
intermediate
working-set
al
w1
all

Use temporary tables for intermediate data

Seed article. Converted from an existing performance-review prompt to bootstrap the BCQuality performance corpus. Domain stewards should expand, restructure, and refine as needed.

Description

Temporary tables live in memory, not in SQL. They are the correct primary data structure for intermediate results, working sets, and lookup caches that do not need to outlive the current operation. Using a real persisted table for scratch data incurs database round-trips, transaction scope, and locking for data that has no business being persisted.

Best Practice

Declare the record variable with temporary when the data is scratch. Populate it with Insert(false) to avoid firing triggers. Clear the table explicitly with DeleteAll when the variable's scope is long-lived (a SingleInstance codeunit or a reused session variable) and needs to be reset between uses.

See sample: use-temporary-tables-for-intermediate-data.good.al.

Anti Pattern

Writing intermediate results to a real table, processing them, and deleting them afterwards performs the full cost of INSERT and DELETE operations on data that never needed to be transactional.