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feat: 가상화 문서들 추가

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DongHyeonka
2026-09-10 08:54:05 +09:00
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docs/n+1liner/final/assets/diagrams/nplus1-query-fanout/nplus1-query-fanout.alt.md
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# 반환 부모 수 N이 컬렉션 초기화와 자식 SELECT 횟수를 결정한다
## Alternative text
FeedItem N개를 반환하는 loadFeed 요청이 컬렉션 초기화 N회와 Highlight SELECT N회로 이어지는 인과 흐름도.
## Long description
왼쪽의 loadFeed 요청은 한 페이지에서 N개의 FeedItem을 반환한다. 매핑이 각 부모의 Highlight 컬렉션에 접근하면 컬렉션 초기화가 부모마다 한 번씩 일어나 총 N회가 된다. 현재 기준선에서는 배치나 서브셀렉트가 없어 초기화 한 번마다 Highlight SELECT도 한 번 실행되므로 추가 조회가 N회 발생한다. 각 SELECT는 해당 부모의 Highlight 자식 행을 전부 읽는다.
## Elements and evidence
- **loadFeed(0, N) → FeedItem N개** (request): 한 요청에서 반환한 부모 수 N이 N+1 증가 계수가 되는 피드 조회. Evidence: L382–L385, L455–L456.
- **Highlight 컬렉션 초기화 N회** (operation): 각 FeedItem의 지연 컬렉션 접근이 부모마다 한 번의 초기화를 만든 결과. Evidence: L374–L375, L431–L431, L437–L439.
- **Highlight SELECT N회** (query): 배치와 서브셀렉트가 없는 기준선에서 컬렉션 초기화마다 실행되는 자식 SELECT. Evidence: L374–L375, L437–L442.
## Relationships
- **Highlight 컬렉션 초기화 N회 → Highlight SELECT N회:** SELECT 실행. Evidence: L374–L375, L437–L439.
- **loadFeed(0, N) → FeedItem N개 → Highlight 컬렉션 초기화 N회:** 컬렉션 접근. Evidence: L437–L439.
docs/n+1liner/final/assets/diagrams/nplus1-query-fanout/nplus1-query-fanout.d2
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# 반환 부모 수 N이 컬렉션 초기화와 자식 SELECT 횟수를 결정한다
# Question: 왜 한 번의 피드 요청에서 반환한 FeedItem 수 N이 Highlight 추가 조회 N회로 이어지는가?
direction: right
n0: "loadFeed(0, N) → FeedItem N개" {
shape: rectangle
}
n1: "Highlight 컬렉션 초기화 N회" {
shape: rectangle
}
n2: "Highlight SELECT N회" {
shape: rectangle
}
n0 -> n1: "컬렉션 접근"
n1 -> n2: "SELECT 실행"
docs/n+1liner/final/assets/diagrams/nplus1-query-fanout/nplus1-query-fanout.dot
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digraph techviz {
graph [rankdir=LR, splines=ortho, nodesep=0.55, ranksep=0.85];
node [fontname=Helvetica, fontsize=11, margin="0.18,0.12", style="rounded,filled", fillcolor=white, color="#2d4357", penwidth=1.5];
edge [fontname=Helvetica, fontsize=10, color="#364b5f", penwidth=1.4, arrowsize=0.75];
n0 [label="loadFeed(0, N) → FeedItem N개", shape=box, style="rounded,filled"];
n1 [label="Highlight 컬렉션 초기화 N회", shape=box, style="rounded,filled"];
n2 [label="Highlight SELECT N회", shape=box, style="rounded,filled"];
n0 -> n1 [label="컬렉션 접근", style=solid];
n1 -> n2 [label="SELECT 실행", style=solid];
}
docs/n+1liner/final/assets/diagrams/nplus1-query-fanout/nplus1-query-fanout.drawio
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<root>
<mxCell id="0"/>
<mxCell id="1" parent="0"/>
<mxCell id="n_feed-request" value="loadFeed(0, N) → FeedItem N개&lt;br/&gt;page size = 반환 부모 수 N" tooltip="한 요청에서 반환한 부모 수 N이 N+1 증가 계수가 되는 피드 조회. | Evidence: L341-L341, L398-L398" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
<mxCell id="n_feed-request" value="loadFeed(0, N) → FeedItem N개&lt;br/&gt;page size = 반환 부모 수 N" tooltip="한 요청에서 반환한 부모 수 N이 N+1 증가 계수가 되는 피드 조회. | Evidence: L382-L385, L455-L456" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
<mxGeometry x="70.0" y="60.0" width="181.0" height="91.0" as="geometry"/>
</mxCell>
<mxCell id="n_collection-initializations" value="Highlight 컬렉션 초기화 N회&lt;br/&gt;collectionFetches = N" tooltip="각 FeedItem의 지연 컬렉션 접근이 부모마다 한 번의 초기화를 만든 결과. | Evidence: L337-L337, L378-L384" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;strokeColor=#2563eb;strokeWidth=2;" vertex="1" parent="1">
<mxCell id="n_collection-initializations" value="Highlight 컬렉션 초기화 N회&lt;br/&gt;collectionFetches = N" tooltip="각 FeedItem의 지연 컬렉션 접근이 부모마다 한 번의 초기화를 만든 결과. | Evidence: L374-L375, L431-L431, L437-L439" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;strokeColor=#2563eb;strokeWidth=2;" vertex="1" parent="1">
<mxGeometry x="411.0" y="70.0" width="181.0" height="71.0" as="geometry"/>
</mxCell>
<mxCell id="n_highlight-selects" value="Highlight SELECT N회&lt;br/&gt;부모별 자식 행 전부 조회" tooltip="배치와 서브셀렉트가 없는 기준선에서 컬렉션 초기화마다 실행되는 자식 SELECT. | Evidence: L337-L337, L384-L385" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
<mxCell id="n_highlight-selects" value="Highlight SELECT N회&lt;br/&gt;부모별 자식 행 전부 조회" tooltip="배치와 서브셀렉트가 없는 기준선에서 컬렉션 초기화마다 실행되는 자식 SELECT. | Evidence: L374-L375, L437-L442" style="whiteSpace=wrap;html=1;rounded=1;strokeWidth=2;fontSize=14;fontStyle=1;fillColor=#ffffff;strokeColor=#2d4357;verticalAlign=middle;" vertex="1" parent="1">
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<mxCell id="e_initialization-runs-select" value="초기화마다 SELECT 1회" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_collection-initializations" target="n_highlight-selects">
<mxCell id="e_initialization-runs-select" value="SELECT 실행" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_collection-initializations" target="n_highlight-selects">
<mxGeometry relative="1" as="geometry">
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<mxCell id="e_parents-trigger-initialization" value="아이템마다 컬렉션 접근" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_feed-request" target="n_collection-initializations">
<mxCell id="e_parents-trigger-initialization" value="컬렉션 접근" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;strokeWidth=2;endArrow=block;endFill=1;" edge="1" parent="1" source="n_feed-request" target="n_collection-initializations">
<mxGeometry relative="1" as="geometry">
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docs/n+1liner/final/assets/diagrams/nplus1-query-fanout/nplus1-query-fanout.excalidraw
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docs/n+1liner/final/assets/diagrams/nplus1-query-fanout/nplus1-query-fanout.manifest.json
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"nplus1-query-fanout.drawio",
"nplus1-query-fanout.mmd",
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docs/n+1liner/final/assets/diagrams/nplus1-query-fanout/nplus1-query-fanout.mmd
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@@ -0,0 +1,8 @@
%% 반환 부모 수 N이 컬렉션 초기화와 자식 SELECT 횟수를 결정한다
%% question: 왜 한 번의 피드 요청에서 반환한 FeedItem 수 N이 Highlight 추가 조회 N회로 이어지는가?
flowchart LR
n0["loadFeed(0, N) → FeedItem N개"]
n1["Highlight 컬렉션 초기화 N회"]
n2["Highlight SELECT N회"]
n0 -->|"컬렉션 접근"| n1
n1 -->|"SELECT 실행"| n2
docs/n+1liner/final/assets/diagrams/nplus1-query-fanout/nplus1-query-fanout.svg
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View File
@@ -2,7 +2,7 @@
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<title id="diagram-title">반환 부모 수 N이 컬렉션 초기화와 자식 SELECT 횟수를 결정한다</title>
<desc id="diagram-description">왼쪽의 loadFeed 요청은 한 페이지에서 N개의 FeedItem을 반환한다. 매핑이 각 부모의 Highlight 컬렉션에 접근하면 컬렉션 초기화가 부모마다 한 번씩 일어나 총 N회가 된다. 현재 기준선에서는 배치나 서브셀렉트가 없어 초기화 한 번마다 Highlight SELECT도 한 번 실행되므로 추가 조회가 N회 발생한다. 각 SELECT는 해당 부모의 Highlight 자식 행을 전부 읽는다.</desc>
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<text class="edge-label" x="672.0" y="78.5">초기화마다 SELECT 1회</text>
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<text class="edge-label" x="331.0" y="78.5">아이템마다 컬렉션 접근</text>
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<text class="edge-label" x="672.0" y="78.5">SELECT 실행</text>
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<text class="edge-label" x="331.0" y="78.5">컬렉션 접근</text>
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<text class="node-label" x="160.5" y="87.0">loadFeed(0, N) →</text>
<text class="node-label" x="160.5" y="105.0">FeedItem N개</text>
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<text class="node-detail" x="86.0" y="143.0">page size = 반환 부모 수 N</text>
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<text class="node-label" x="501.5" y="97.0">Highlight 컬렉션 초기화 N회</text>
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<text class="node-detail" x="427.0" y="135.0">collectionFetches = N</text>
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<text class="node-label" x="835.5" y="97.0">Highlight SELECT N회</text>
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<text class="node-detail" x="768.0" y="135.0">부모별 자식 행 전부 조회</text>
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