Batch inserts using JPA EntityManager

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Is there a way where we can use batch inserts using JPA EntityManager. I know there is no direct way to achieve this but there must be some way to achieve this mechanism.

Actually, for every insert operation it's taking me 300ms which I want to reduce using batch inserts instead of single inserts.

Here's code I am using currently executing for single inserts

        @PersistenceContext(unitName = "testing")
        EntityManager eM;

        Query querys = this.eM.createNativeQuery(insertQuery);
        for (String s : someList) {
            //setting parameters
            querys.executeUpdate();
        }

Thanks in advance.

It is possible to perform batch writes using JPA, but it's highly dependent on the specific implementation of your persistence provider, database and JDBC driver. For example, this article explains how to enable batch writing (optimization #8) using EclipseLink JPA 2.3 and an Oracle database.Look for similar configuration parameters in your particular environment.

Spring Data JPA Batch Inserts, We may be able to improve performance and consistency by batching multiple inserts into one. In this tutorial, we'll look at how to do this with  In this tutorial, we'll look at how we can batch insert or update entities using Hibernate/JPA. Batching allows us to send a group of SQL statements to the database in a single network call. This way, we can optimize the network and memory usage of our application.

Depending on whether the transaction encloses the loop, batching typically already happens in your case.

JPA will collect all your updates in its L1 cache, and typically write that all to the DB in a batch when the transaction commits. This is not really that different with batching in JDBC, where every batch-item you add is also temporarily in memory until you call an update method.

Potentially problematic is that you don't have hard guarantees that JPA indeed does this batching at all and if does this at transaction commit or when a threshold is reached, but I found that in practice in nearly all cases and especially in cases involving such a simple update loop, it indeed does batching.

One problem is that even if JPA indeed already does batching you still may want to control batch sizes. The articles linked by the other answers provide pretty useful information for that.

Finally, you should be aware that your L1 cache keeps growing in a loop, so if the number of updates are really large, periodically clear it. Alternatively, if your business logic can sustain it, do partial updates in multiple transactions. E.g. item 0 to 100.000 in transaction 1, 100.001 to 200.000 in transaction 2, etc.

Batch inserts using JPA EntityManager, It is possible to perform batch writes using JPA, but it's highly dependent on the specific implementation of your persistence provider, database  But you are saying that you want the EJB method through Hibernate, so the entity manager documentation also has a chapter on that here. I suggest that you read both (the core and the entity manager). In EJB, it is simply about using EJB-QL (with some limitations). Hibernate provides more mechanics though if you need more flexibility.

I know this is a fairly old question with an accepted answer. Nonetheless, I'd like give a new answer to this very specific subject "JPA batch inserts".

@PersistenceContext
private EntityManager entityManager;

@Value("${hibernate.jdbc.batch_size}")
private int batchSize;

public <T extends MyClass> Collection<T> bulkSave(Collection<T> entities) {
  final List<T> savedEntities = new ArrayList<T>(entities.size());
  int i = 0;
  for (T t : entities) {
    savedEntities.add(persistOrMerge(t));
    i++;
    if (i % batchSize == 0) {
      // Flush a batch of inserts and release memory.
      entityManager.flush();
      entityManager.clear();
    }
  }
  return savedEntities;
}

private <T extends MyClass> T persistOrMerge(T t) {
  if (t.getId() == null) {
    entityManager.persist(t);
    return t;
  } else {
    return entityManager.merge(t);
  }
}

Source: http://frightanic.com/software-development/jpa-batch-inserts/

The best way to do batch processing with JPA and Hibernate, When using JPA, assuming you want to insert 50 Post entities, this is The EntityManager is cleared after every batch execution so that we  JPA batch inserts with Spring Data JPA A casual observer could be fooled into thinking that Spring Data JPA offers JPA batch inserts out of the box transparently behind the scenes. It’s true that CrudRepository does have a save(Iterable) method that calls save(Entity) in a loop.

JPA by itself does not have any settings for batching. However there are some implementation-dependent settings. Here is an example for hibernate.

JPA batch inserts with Hibernate & Spring Data • my2cents, Implementing JPA batch inserts with Hibernate can be quite tricky. This post outlines the necessary JPA batch inserts (aka bulk inserts) may seem trivial at first. However, if you're not private EntityManager entityManager;. In this article, you are going to find out what batch processing is, why do we use it, and how to use it properly with JPA and Hibernate. Batch processing When writing an enterprise application, it’s common to split your work between the front-end system which serves a typical OLTP (Online Transaction Processing) traffic, and one or more batch processors which are used for ETL (Extract, Transform, Load) purposes.

Hibernate/JPA Batch Insert and Batch Update Example , batch insert and batch update statements using JPA and Hibernate. Use the flush() and clear() methods of the EntityManager regularly,  This tutorial shows how to create batch insert and batch update statements using JPA and Hibernate. JDBC offers support for batching together SQL statements that can be represented as a single PreparedStatement. The JDBC driver will send the batched operation to the server in one call.

Spring Boot Bulk and Batch imports, Bulk and Batch imports with Spring Boot using the EntityManager. 20.12.2017 spring.jpa.properties.hibernate.order_inserts= true. Here is simple example I've created after reading several topics about jpa bulk inserts, I have 2 persistent objects User, and Site. One user could have many site, so we have one to many relations here.

Hibernate EntityManager Batch insert and update (Object Relational , Hibernate EntityManager Batch insert and update. Post by: leonardo ginting , Ranch Hand. May 15, 2012 20:42:40. how could i speed up when trying to insert thousands row,, i'm using jboss 5, hibernate, class >id.co.compnet.api.adm.jpa. You can do flush() and clear() on the entityManager directly. BUT: Usually doing big inserts with java is the wrong way; dumping everything to file, transferring these to the destination server and bulk loading usually works better.

Comments
  • Hi,can u provide me some code snippet how to use the same in above provided code.
  • @Rana as I stated above: it depends on what persistence provider you're using - and I can't tell by looking at the code, you have to tell me.
  • Hi,I am using org.eclipse.persistence.jpa.PersistenceProvider. Also please let me know if there are any limitations using the batch inserts.
  • @Rana it's all in the linked article, you have to edit the persistence.xml file and add something like <property name="eclipselink.jdbc.batch-writing" value="JDBC"/> <property name="eclipselink.jdbc.batch-writing.size" value="1000"/>. Please take the time to read the article first.
  • Hi,I have added that already and I am looking info for any pitfalls I need to watch using this statement. Thanks.
  • Hey I used spring data jpa now, so you mean if I update object in a loop inside a method and this method is marked by @Transactional, it will automatically batch update like jdbc batch update.
  • I guess we need to again flush() and clear() at the end to save any remaining objects which didn't complete our batch size?