Spring Boot JPA - 数据库查询性能
@Language("SQL")
@Query(
"""
SELECT DISTINCT o.*, ooc.*
FROM WHITE_TABLE o
LEFT JOIN BLUE_TABLE oow ON o.BLUE_ID= oow.ID
LEFT JOIN RED_TABLE ooc on o.ID = ooc.RED_ID
LEFT JOIN GREEN_TABLE ce on ce.GREEN_ID= ooc.RED_ID
LEFT JOIN ORANGE TABLE d on d.ORANGE_GREEN_ID= ce.ID
WHERE d.STATE= 'A'
AND o.NO_MATTER IN :#{#param.setIds1}
AND o.NO_MATTER IN :#{#param.setIds2}
AND ooc.NO_MATTER IN :#{#param.setIds3}
AND oow.NO_MATTER IN :#{#param.setIds4}
AND (
(
o.TIME is not null AND
trunc(cast(o.TIME as DATE)) BETWEEN
:#{#param.time_value} AND :#{#param.time_value2}
) OR
(
o.EXPIRE_TIME is null AND
:#{#param.time} BETWEEN
trunc(cast(d.time_value as Date)) AND trunc(cast(d.time_value2 as Date))
)
)
""", nativeQuery = true
)
我有一个包含多个内部联接的查询,并且存在性能问题。即使我在邮递员中获取 2 个对象,该查询的加载时间也是 2/3 秒。您知道优化查询的可能性有哪些?在这种情况下,我不可能使用“非本机查询”。绿色和橙色表在代码中没有实体表示。
据报道 TRUNC CAST
需要花费大量时间并且效率低下,但是还能怎么写呢?
How can I speed up the query?反射 ?意见?你有什么例子吗?
我补充一下,数据库是Oracle,并且有索引。
@Language("SQL")
@Query(
"""
SELECT DISTINCT o.*, ooc.*
FROM WHITE_TABLE o
LEFT JOIN BLUE_TABLE oow ON o.BLUE_ID= oow.ID
LEFT JOIN RED_TABLE ooc on o.ID = ooc.RED_ID
LEFT JOIN GREEN_TABLE ce on ce.GREEN_ID= ooc.RED_ID
LEFT JOIN ORANGE TABLE d on d.ORANGE_GREEN_ID= ce.ID
WHERE d.STATE= 'A'
AND o.NO_MATTER IN :#{#param.setIds1}
AND o.NO_MATTER IN :#{#param.setIds2}
AND ooc.NO_MATTER IN :#{#param.setIds3}
AND oow.NO_MATTER IN :#{#param.setIds4}
AND (
(
o.TIME is not null AND
trunc(cast(o.TIME as DATE)) BETWEEN
:#{#param.time_value} AND :#{#param.time_value2}
) OR
(
o.EXPIRE_TIME is null AND
:#{#param.time} BETWEEN
trunc(cast(d.time_value as Date)) AND trunc(cast(d.time_value2 as Date))
)
)
""", nativeQuery = true
)
I have a query with several inner joins and I have a performance problem. The query even if I fetch 2 objects in postman the loading time is 2/3 seconds. What possibilities do you know to optimize the query ? In this case I have no possibility to use "NON native query". GREEN and ORANGE tables do not have their entity representation in the code.
Reportedly TRUNC CAST
takes a lot of time and is inefficient but how else to write it ?
How can I speed up the query? Reflection ? Views? Do you have any examples?
I will add that the database is Oracle and there are indexes.
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如果您有这样的动态查询,我建议使用 Criteria Builder API。如果您的数据库版本发生变化怎么办?您将不得不返回并在您的查询中进行一些更改。这将导致浪费时间或精神崩溃,并且在某些情况下需要加快您的查询速度。
https://ubiq.co/database-blog/how -to-speed-up-sql-queries/
我建议使用视图可以提高性能。
<一href="https://stackoverflow.com/questions/439056/is-a-view-faster-than-a-simple-query#:%7E:text=Yes%2C%20views%20can%20have%20a,那个%20观看次数%20可以%20提高%20性能.">https://stackoverflow.com/questions/439056/is-a-view-faster-than-a-simple-query#:~:text=Yes%2C%20views%20can%20have%20a,that% 20 观看次数%20 可以%20 提高%20 性能。
If you have dynamic queries like this, I recommend using the Criteria Builder API. What if your database version changes? You will have to return and make some changes in your query.and this will cause a waste of time or a nervous breakdown and there is some cases to speed up for your queries .
https://ubiq.co/database-blog/how-to-speed-up-sql-queries/
and I suggested using Views can improve performance.
https://stackoverflow.com/questions/439056/is-a-view-faster-than-a-simple-query#:~:text=Yes%2C%20views%20can%20have%20a,that%20Views%20can%20improve%20performance.