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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
parent 56ce52a9c7
commit 87ba36e650
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37 changed files with 920 additions and 37 deletions
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39
microsoft/knowledge/performance/temporary-tables-have-no-database-cost.bad.al Normal file
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// Caller supplies an unfiltered temporary buffer that does not change during this call.
table 50373 "Perf Cell"
{
DataClassification = CustomerContent;
fields
{
field(1; "Cell No."; Integer) { }
field(2; "Item No."; Code[20]) { }
field(3; Quantity; Decimal) { }
}
keys
{
key(PK; "Cell No.") { Clustered = true; }
}
}
codeunit 50374 "Perf Temp Totals Bad"
{
procedure SumDisplayedItemTotals(var TempCells: Record "Perf Cell" temporary) DisplayedTotal: Decimal
var
TempScan: Record "Perf Cell" temporary;
ItemTotal: Decimal;
begin
TempScan.Copy(TempCells, true);
if TempCells.FindSet() then
repeat
TempScan.Reset();
TempScan.SetRange("Item No.", TempCells."Item No.");
ItemTotal := 0;
if TempScan.FindSet() then
repeat
ItemTotal += TempScan.Quantity;
until TempScan.Next() = 0;
DisplayedTotal += ItemTotal;
until TempCells.Next() = 0;
end;
}