One of the biggest misconceptions about #Hibernate is that it causes performance problems. But that’s not the case. Many successful projects use it to implement a highly scalable persistence layer.
Here are 8 recommendations for a fast persistence layer
Here are 8 recommendations for a fast persistence layer
1. Activate statistics to find problems as early as possible
Set the property 𝘩𝘪𝘣𝘦𝘳𝘯𝘢𝘵𝘦.𝘨𝘦𝘯𝘦𝘳𝘢𝘵𝘦_𝘴𝘵𝘢𝘵𝘪𝘴𝘵𝘪𝘤𝘴 to 𝘵𝘳𝘶𝘦 to activate #Hibernate's statistics and get a summary of all performed operations
Set the property 𝘩𝘪𝘣𝘦𝘳𝘯𝘢𝘵𝘦.𝘨𝘦𝘯𝘦𝘳𝘢𝘵𝘦_𝘴𝘵𝘢𝘵𝘪𝘴𝘵𝘪𝘤𝘴 to 𝘵𝘳𝘶𝘦 to activate #Hibernate's statistics and get a summary of all performed operations
2. Improve slow queries
You will find slow queries. They are not a Hibernate issue. They occur with every framework, even plain #SQL over JDBC. That’s why your database provides tools to analyze SQL statements.
Optimize your query and execute it as a native statement.
You will find slow queries. They are not a Hibernate issue. They occur with every framework, even plain #SQL over JDBC. That’s why your database provides tools to analyze SQL statements.
Optimize your query and execute it as a native statement.
3. Use FetchType.LAZY
To-many associations use FetchType.LAZY by default, and you shouldn't change that.
But you need to change it for your to-one associations. You can do that by setting the fetch attribute on the @ManyToOne or @OneToOne annotation.
To-many associations use FetchType.LAZY by default, and you shouldn't change that.
But you need to change it for your to-one associations. You can do that by setting the fetch attribute on the @ManyToOne or @OneToOne annotation.
@manytoone @OneToOne 4. Use query-specific fetching
If you let #Hibernate initialize lazily fetched associations, it has to use a separate query for each entity and association. That causes n+1 select problems.
Use JOIN FETCH clauses and EntityGraphs to avoid that
If you let #Hibernate initialize lazily fetched associations, it has to use a separate query for each entity and association. That causes n+1 select problems.
Use JOIN FETCH clauses and EntityGraphs to avoid that
@manytoone @OneToOne 5. Model Many-to-Many as Set
#Hibernate manages many-to-many associations inefficiently if you model them as a List. If you add or remove an element, it removes all association records before it inserts all remaining ones.
You can avoid that by modeling it as a java.util.Set
#Hibernate manages many-to-many associations inefficiently if you model them as a List. If you add or remove an element, it removes all association records before it inserts all remaining ones.
You can avoid that by modeling it as a java.util.Set
@manytoone @OneToOne 6. Let the database handle data-heavy operations
Databases are optimized to handle huge datasets. Use functions and stored procedures to perform data-heavy operations that are not too complex and only return a small result
Databases are optimized to handle huge datasets. Use functions and stored procedures to perform data-heavy operations that are not too complex and only return a small result
@manytoone @OneToOne 7. Use caches
Hibernate offers 3 caches:
1st level cache = all entities used in the current Session
2nd level cache = Session-independent cache that contains entities
Query cache = Session-independent cache that contains query results
Hibernate offers 3 caches:
1st level cache = all entities used in the current Session
2nd level cache = Session-independent cache that contains entities
Query cache = Session-independent cache that contains query results
@manytoone @OneToOne 8. Perform updates and deletes in bulks
Changing one entity after the other feels natural in Java, but is also inefficient. A better approach would be to use 1 update or delete statement that affect multiple records at once.
You can do this via JPQL, SQL and Criteria API.
Changing one entity after the other feels natural in Java, but is also inefficient. A better approach would be to use 1 update or delete statement that affect multiple records at once.
You can do this via JPQL, SQL and Criteria API.
@manytoone @OneToOne I explained all tips in more details in this blog post:
thorben-janssen.com/tips-to-boost-…
thorben-janssen.com/tips-to-boost-…
• • •
Missing some Tweet in this thread? You can try to
force a refresh
