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[22기_이연호] 성능최적화 미션 제출합니다. #62

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[22기_이연호] 성능최적화 미션 제출합니다. #62

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3096dcf
7주차 과제
dldusgh318 Nov 15, 2025
3468156
7주차 과제 - 사진 오류 수정
dldusgh318 Nov 17, 2025
70c64d2
7주차 과제 - 사진 오류 수정
dldusgh318 Nov 17, 2025
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16 changes: 10 additions & 6 deletions INDEX.md
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Expand Up @@ -63,7 +63,7 @@ ON movie (age_rating, movie_id, genre);

인덱스 사용 전 후 비교

![image.png](attachment:f2fe2ebd-d508-4d26-ad10-6028d71b67b6:image.png)
<img width="951" height="79" alt="스크린샷 2025-11-15 오전 2 42 53" src="https://github.com/user-attachments/assets/fec669c8-50e8-4622-9a90-479d907e786a" />

실행 전에는 Durationn이 0.00079sec, fetch가 0.000016 sec이었다.

Expand All @@ -75,7 +75,7 @@ ON movie (age_rating, movie_id, genre);

그렇다면 인덱스는 데이터가 수천~수만 건일 때 효율적이라는 걸 확인
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@Hoyoung027 Hoyoung027 Nov 17, 2025

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데이터 양이 적은 경우에는 오히려 인덱스가 비효율적이기도 하군요..! 여기 내용 중에 언급하신 인덱스 관리 비용에 포함되는 것들은 무엇인지 같이 알아보면 좋을 것 같습니다.

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@dldusgh318 dldusgh318 Nov 17, 2025

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제가 전에 조사했을 때는 데이터 양이 적은 경우, 또는 엔티티 구조가 복잡하지 않은 경우에는 불필요하다고 나와있었습니다! 다른 건 같이 알아보면 좋을 거 같아요~~
트랜잭션 부분도 다시 올렸으니 시간되실 때 확인 부탁드립니다!


![image.png](attachment:be16d42e-4a69-48aa-8e92-e66f7cfda108:image.png)
<img width="1115" height="602" alt="스크린샷 2025-11-15 오전 2 39 56" src="https://github.com/user-attachments/assets/ef92d258-759d-474c-8f39-85dc2b87c30e" />

실제로 데이터를 1200건 넣었고, 데이터가 많을 때는 인덱스가 효과적이라는 사실을 알 수 있었다

Expand All @@ -85,11 +85,11 @@ ON movie (age_rating, movie_id, genre);
select movie_id, genre from movie where age_rating = 'ALL' GROUP BY movie_id, genre;
```

![image.png](attachment:df54f3b9-8185-425c-ad84-4e21b488e8aa:image.png)
<img width="802" height="242" alt="image" src="https://github.com/user-attachments/assets/a800c507-2fb9-4da5-b36f-53f48a00bb5c" />

explain으로 확인한 결과 커버링 인덱스 사용하는 거 확인

![image.png](attachment:96ebb339-c0da-4e71-bde9-c85f322879cf:image.png)
<img width="642" height="58" alt="image" src="https://github.com/user-attachments/assets/19f88adc-6fae-4dd5-8807-b48991061eed" />

duration이 0.0010 → 0.00089, fetch가 0.000015 → 0.000014로 줄어든 걸 확인할 수 있었다.

Expand Down Expand Up @@ -119,6 +119,10 @@ CREATE INDEX idx_schedule_movie_theater_start
ON schedule (movie_id, theater_id, start_time);
```

![image.png](attachment:f9bb6e9a-7421-4716-a6c5-d5ce0ede626a:image.png)
<img width="998" height="99" alt="image" src="https://github.com/user-attachments/assets/f35fb97b-3cbf-476d-bc3d-121e5ead547e" />


<img width="1023" height="72" alt="image" src="https://github.com/user-attachments/assets/b8d7ac6f-7bed-4215-9a55-860258446fee" />

duration은 0.0020 → 0.0012, fetch는 0.000016 → 0.000012로 줄어든 걸 확인할 수 있다!

duration은 0.0020 → 0.0012, fetch는 0.000016 → 0.000012로 줄어든 걸 확인할 수 있다
2 changes: 1 addition & 1 deletion TRANSACTION.md
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Expand Up @@ -12,7 +12,7 @@
- NEVER
- NESTED

![image.png](attachment:c2f0b822-2c0e-4b20-857a-1324e67944ff:image.png)
<img width="1141" height="593" alt="image" src="https://github.com/user-attachments/assets/3513a857-73bc-4d2d-b099-c49596ccd2c9" />

개인적으로 둘의 차이를 정리해보고 싶어 표로 정리했다.

Expand Down