Best way to save the large number of records in hibernate

Question

I have 5000 records to be saved. what is the best way in the database point of view, whether to save individual records(save(record) 5000 times) or saveAll(list of 5000 records)

Answer 1

Saving 5000 records at a time may run out of the memory and get OutOfMemoryException because 5000 instances may occupy pretty large memory.

Saving one record at a time means that you do not make use of JDBC 's batching feature which can insert records more effectively.

So , to achieve the optimal performance , you should tell hibernate to use JDBC 's batching feature by setting hibernate.jdbc.batch_size to some non-zero value . The number of records saved at a time should equal to the value of hibernate.jdbc.batch_size.

Also , you should clear the session to release memory to prevent memory exhaustion at the end of each batch. You could also disable the second-level cache to reduce the unnecessary overhead.

Reference : Hibernate batch size confusion