Batch-Insertion in Hibernate
To enable batch-processing to upload a large number of records into your database using Hibernate.
If you are undertaking batch processing you will need to enable the use of JDBC batching. This is absolutely essential if you want to achieve optimal performance. Set the JDBC batch size to a reasonable number (10-50, for example):
hibernate.jdbc.batch_size 20
the code snippet look like this ,
Session session = sessionFactory.openSession();
Transaction txInstance = session.beginTransaction();
for ( int i=0; i<100000; i++ ) {
Student student = new Student(.....);
session.save(student);
if ( i % 40 == 0 ) {
session.flush();
session.clear();
}
}
txInstance.commit();
session.close();
When making new objects persistent flush() and then clear() the session regularly in order to control the size of the first-level cache because by default, Hibernate will cache all the persisted objects in the session-level cache and ultimately your application would fall over with an OutOfMemoryException.
A JDBC batch can target one table only, so every new DML statement targeting a different table ends up the current batch and initiates a new one. Mixing different table statements is therefore undesirable when using SQL batch processing.
PUSHPRAJ KUMAR (BI Developer)
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