Hibernate Framework Hibernate Performance Tuning

Question 1

Which Hibernate feature allows bulk loading of lazy collections more efficiently?

Accepted Answer

Batch fetching with @BatchSize

Answer

@BatchSize configures Hibernate to load multiple lazy collections in a single batch query instead of individual queries per entity.

Question 2

What is a StatelessSession in Hibernate?

Accepted Answer

A session without a first-level cache for bulk data operations

Answer

StatelessSession bypasses the first-level cache and is optimized for bulk insert/update/delete operations where caching overhead is undesirable.

Question 3

Which Hibernate feature improves bulk INSERT performance?

Accepted Answer

JDBC batch inserts via hibernate.jdbc.batch_size

Answer

Setting hibernate.jdbc.batch_size batches multiple INSERT statements into a single JDBC call, dramatically reducing round trips for bulk inserts.

Question 4

What does FetchType.EAGER do to query performance?

Accepted Answer

Can cause excessive data loading and degrade performance with large datasets

Answer

EAGER loading always fetches associations, even when not needed, which can result in loading huge datasets and degrading performance.

Question 5

What is the purpose of database connection pooling in Hibernate?

Accepted Answer

Reuses existing database connections to avoid the overhead of creating new ones

Answer

Connection pooling maintains a pool of reusable database connections, eliminating the cost of creating and tearing down connections for each request.

Hibernate Framework Practice Test