feat: 가상화 문서들 추가
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DongHyeonka
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<?xml version="1.0" encoding="UTF-8"?>
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<svg xmlns="http://www.w3.org/2000/svg" width="870" height="542" viewBox="0 0 870 542" role="img" aria-labelledby="diagram-title diagram-description">
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<title id="diagram-title">배치는 부모를 먼저 페이징하고 자식을 IN으로 따로 가져온다</title>
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<desc id="diagram-description">조회 코드가 부모 페이지를 요청하면 세션이 feed_items에 부모만 LIMIT으로 조회한다. 돌아온 부모에는 초기화되지 않은 컬렉션 프록시가 붙어 있다. 세션은 그 프록시를 batch fetch size만큼 모아 highlights를 WHERE fk IN 으로 조회하고, 받은 자식 행으로 컬렉션을 채워 조회 코드에 돌려준다.</desc>
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<metadata>{"techviz":{"spec_version":"1.1","id":"batch-fetch-in-clause","profile":"sequence"},"source_context":{"document":"docs/n+1liner/final/document.md","document_sha256":"385ca44db5bf763cb1ff28a67d531d68876402b35d21dc54f2bc702e8bda0053","anchor":{"kind":"heading","value":"11.5 배치가 N+1과 페이징을 함께 해결하는 이유","line":1007}},"evidence_policy":"Each factual element cites source lines or is marked assumption.","diagram_only":true}</metadata>
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<text class="node-label" x="120.0" y="106.0">조회 코드</text>
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<text class="node-label" x="330.0" y="65.0">Hibernate 세션</text>
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<rect class="node-shape kind-store emphasis-normal role-participant" data-evidence="1010-1011" x="675.0" y="48.0" width="150.0" height="52.0" /><ellipse class="node-shape kind-store emphasis-normal role-participant" cx="750.0" cy="48.0" rx="75.0" ry="13.0" /><path class="storage-bottom" d="M 675.0 100.0 A 75.0 13.0 0 0 0 825.0 100.0" />
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<text class="node-label" x="750.0" y="75.0">highlights</text>
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<text class="edge-label" x="225.0" y="129.0">1. 부모 페이지 요청</text>
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<polyline class="edge kind-query style-solid emphasis-normal" points="330.0,202.0 540.0,202.0" data-evidence="1009-1010" />
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<text class="edge-label" x="435.0" y="191.0">2. 부모 LIMIT 페이징</text>
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<text class="edge-label" x="435.0" y="253.0">3. 페이지 부모 + 미초기화 프록시</text>
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<text class="edge-label" x="540.0" y="315.0">4. WHERE fk IN (?,…) 배치</text>
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<text class="edge-label" x="540.0" y="377.0">5. 자식 행</text>
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<text class="edge-label" x="225.0" y="439.0">6. 부모 + 컬렉션</text>
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After Width: | Height: | Size: 7.8 KiB |
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