mirror of
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a9f3c50863
The previous LLM-generated knowledge files contained factual
hallucinations. The most visible was the claim that `FindFirst` /
`FindLast` "forces a full-table scan" on an unfiltered record - it does
not; those APIs return a single row via the current key.
Other inaccuracies the audit found and fixed:
* `FindSet(true)` was described as "taking a LockTable". The correct
upstream phrasing is that `FindSet(true)` sets
`ReadIsolation::UpdLock` on the read. UpdLock and LockTable are
related but distinct mechanisms.
* The list of production-scale tables had been invented beyond the
upstream source (e.g. "Detailed Cust. Ledg. Entry") without a
citation. The regenerated list matches the ten tables upstream lists
with their P95 row counts.
* `SetLoadFields` guidance had been augmented with an extra mechanism
claim ("the database resolves the filter using the index without
hydrating the value") not present in upstream.
Approach: full regeneration of `microsoft/knowledge/` from the six
upstream BCApps Code Review instruction files, with Microsoft Learn /
the AL language reference as a secondary source. Every claim in every
regenerated file is anchored to a verbatim upstream quote (or a Learn
URL); the audit trail lives in artifacts/trace-<domain>.json on the
session workspace.
The PR #11 transaction/error-handling cluster is preserved verbatim:
* performance/understand-implicit-transaction-boundary.md
* performance/codeunit-run-as-atomic-sub-operation.{md,good.al,bad.al}
* performance/codeunit-run-requires-prior-commit-inside-transaction.{md,good.al,bad.al}
* performance/use-tryfunction-for-error-catching-not-rollback.{md,good.al,bad.al}
* performance/avoid-commit-inside-loops.{md,good.al,bad.al}
* security/commitbehavior-attribute-scopes-explicit-commits.{md,good.al,bad.al}
* testing/transactionmodel-attribute-governs-test-transactions.{md,good.al,bad.al}
These articles already cite Microsoft Learn and were carefully
cross-referenced; the regeneration skips their topics rather than
duplicating them.
File counts after regeneration:
performance 35 .md (5 preserved + 30 new)
privacy 17 .md
security 18 .md (1 preserved + 17 new)
style 33 .md
testing 1 .md (preserved)
ui 19 .md
upgrade 18 .md
Total 141 atomic knowledge files, each strictly one rule. All pass
.github/scripts/validate_frontmatter.py with 0 errors and 0 warnings.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
26 lines
1.6 KiB
Markdown
26 lines
1.6 KiB
Markdown
---
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bc-version: [all]
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domain: performance
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keywords: [findset, updlock, readisolation, locking, modify, obsolete-syntax]
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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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# FindSet(true) applies UpdLock on the read; the two-parameter form is obsolete
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## Description
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`FindSet()` and `FindSet(false)` are read-only — no locking. Per the upstream guidance, `FindSet(true)` "signifies the intent is to modify records" and "sets `ReadIsolation::UpdLock` on the record before finding rows." That is exactly the right shape when the loop body modifies each row: the read takes the same lock the modification will need, avoiding the deadlock window between an unlocked read and a later upgrade. The older two-parameter form `FindSet(ForUpdate, UpdateKey)` is obsolete — only the single-parameter signature should appear in new code.
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## Best Practice
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Use `FindSet(true)` only when the loop body genuinely modifies the iterated rows; use `FindSet()` (or `FindSet(false)`) when the loop only reads. Do not write `FindSet(true, true)` or `FindSet(true, false)` — the two-parameter form is the obsolete signature.
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See sample: `findset-true-applies-updlock-on-read.good.al`.
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## Anti Pattern
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`FindSet(true)` on a loop that does not modify the iterated rows takes an `UpdLock` the work does not need; competing readers and writers stall against a lock the loop never uses. The mirror anti-pattern is `FindSet()` (no parameter) on a loop that *does* modify each row — the read takes a shared lock, the `Modify` then needs to upgrade, and the gap between them is a deadlock candidate.
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See sample: `findset-true-applies-updlock-on-read.bad.al`.
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