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강의 내용 중 N+1, 페이징 등의 복합적인 문제를 해결하기 위해 BatchSize 기능을 이용하는데 해당 기능이 동작하질 않아 질문을 드립니다.
스프링부트 설정 파일에 설정한 값은 아래와 같습니다.
# application.yml
spring:
jpa:
hibernate:
ddl-auto: create
properties:
hibernate:
default_batch_fetch_size: 30
jdbc:
batch_size: 100
강의 예시대로라면 아래와 같이 orderItem을 조회할 때에 IN 조건이 발생되어 총 두 번의 쿼리가 나가야 하지만, 실제로는 IN 조건이 생성되지 않고 BatchSize 설정 전과 같이 여전히 N+1 문제가 해결되지 않는 모습입니다.
2022-11-15 05:11:32.146 INFO 19268 --- [io-49445-exec-5] p6spy : 2022-11-15T05:11:32.146352400 / time:0ms /
select
order0_.order_id as order_id1_10_0_,
member1_.member_id as member_i1_6_1_,
delivery2_.delivery_id as delivery1_4_2_,
order0_.delivery_id as delivery4_10_0_,
order0_.member_id as member_i5_10_0_,
order0_.order_date as order_da2_10_0_,
order0_.status as status3_10_0_,
member1_.add_time as add_time2_6_1_,
member1_.city as city3_6_1_,
member1_.street as street4_6_1_,
member1_.zipcode as zipcode5_6_1_,
member1_.description as descript6_6_1_,
member1_.name as name7_6_1_,
delivery2_.city as city2_4_2_,
delivery2_.street as street3_4_2_,
delivery2_.zipcode as zipcode4_4_2_
from
orders order0_
inner join
member member1_
on order0_.member_id=member1_.member_id
inner join
delivery delivery2_
on order0_.delivery_id=delivery2_.delivery_id limit 50 offset 1
2022-11-15 05:11:32.147 INFO 19268 --- [io-49445-exec-5] p6spy : 2022-11-15T05:11:32.147842300 / time:0ms /
select
orderitems0_.order_id as order_id5_9_1_,
orderitems0_.order_item_id as order_it1_9_1_,
orderitems0_.order_item_id as order_it1_9_0_,
orderitems0_.count as count2_9_0_,
orderitems0_.item_id as item_id4_9_0_,
orderitems0_.order_id as order_id5_9_0_,
orderitems0_.order_price as order_pr3_9_0_
from
order_item orderitems0_
where
orderitems0_.order_id=11
2022-11-15 05:11:32.148 INFO 19268 --- [io-49445-exec-5] p6spy : 2022-11-15T05:11:32.148833600 / time:0ms /
select
item0_.item_id as item_id2_5_0_,
item0_.name as name3_5_0_,
item0_.price as price4_5_0_,
item0_.stock_quantity as stock_qu5_5_0_,
item0_1_.author as author1_0_0_,
item0_1_.isbn as isbn2_0_0_,
item0_2_.actor as actor1_7_0_,
item0_2_.director as director2_7_0_,
item0_3_.artist as artist1_8_0_,
item0_3_.etc as etc2_8_0_,
item0_.dtype as dtype1_5_0_
from
item item0_
left outer join
book item0_1_
on item0_.item_id=item0_1_.item_id
left outer join
movie item0_2_
on item0_.item_id=item0_2_.item_id
left outer join
music item0_3_
on item0_.item_id=item0_3_.item_id
where
item0_.item_id=9
2022-11-15 05:11:32.149 INFO 19268 --- [io-49445-exec-5] p6spy : 2022-11-15T05:11:32.149825900 / time:0ms /
select
item0_.item_id as item_id2_5_0_,
item0_.name as name3_5_0_,
item0_.price as price4_5_0_,
item0_.stock_quantity as stock_qu5_5_0_,
item0_1_.author as author1_0_0_,
item0_1_.isbn as isbn2_0_0_,
item0_2_.actor as actor1_7_0_,
item0_2_.director as director2_7_0_,
item0_3_.artist as artist1_8_0_,
item0_3_.etc as etc2_8_0_,
item0_.dtype as dtype1_5_0_
from
item item0_
left outer join
book item0_1_
on item0_.item_id=item0_1_.item_id
left outer join
movie item0_2_
on item0_.item_id=item0_2_.item_id
left outer join
music item0_3_
on item0_.item_id=item0_3_.item_id
where
item0_.item_id=10
엔티티 클래스의 컬렉션 필드에 @BatchSize를 직접 입력해보았지만 결과는 같았습니다.
커뮤니티 질문 중 @Transactional 설정으로 인한 flush 발생 여부에 따라 동작이 상이할 수 있다는 내용을 보고 @Transactional(readonly = true) 설정도 해보았지만 결과는 같았습니다.
전체 프로그램 소스코드 다운로드) https://drive.google.com/file/d/1Q0XQFEBGpAVi0xYhEZgr8qME4rebI39q/view?usp=share_link
답변 1
1
안녕하세요. roman14님
application.yml에서 띄어쓰기가 잘못되어 있습니다. (이게 은근 실수가 많습니다^^)
기존에는 spring.jpa.hibernate.properties.hibernate로 되어 있었는데요.
원본
spring:
datasource:
url: jdbc:h2:tcp://localhost/~/test
username: sa
password:
driver-class-name: org.h2.Driver
jpa:
hibernate:
ddl-auto: create
properties:
hibernate:
default_batch_fetch_size: 30
jdbc:
batch_size: 100
다음과 같이 spring.jpa.properties.hibernate 이렇게 들어가야 합니다.
수정본
spring:
datasource:
url: jdbc:h2:tcp://localhost/~/test
username: sa
password:
driver-class-name: org.h2.Driver
jpa:
hibernate:
ddl-auto: create
properties:
hibernate:
default_batch_fetch_size: 30
jdbc:
batch_size: 100
감사합니다.
이 문제 해결한다고 며칠을 헤맸는데, 굉장히 한심한 실수였네요... 피드백 감사합니다!