Explain caching levels in Hibernate.

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In Hibernate, caching plays a crucial role in improving application performance by reducing the number of database hits. Hibernate supports multiple caching levels that work at different scopes:

1. First-Level Cache (Session Cache):

This is the default cache and is associated with the Session object.
It stores entities within the scope of a Hibernate session.
If an entity is requested multiple times in the same session, Hibernate fetches it from the cache instead of hitting the database.
It is mandatory and cannot be disabled.
Example: If you call session.get(User.class, 1) multiple times in the same session, the query will run only once.

2. Second-Level Cache (SessionFactory Cache):

This cache is optional and shared across multiple sessions, as it is associated with the SessionFactory.
It reduces database calls by storing entity data, collections, or queries across sessions.
To enable it, you must configure cache providers like Ehcache, Infinispan, or Redis.
Entities must be explicitly marked as cacheable using annotations like @Cache.

3. Query Cache:

This is a specialized cache for query result sets.
It works along with the second-level cache because it stores only identifiers of entities, not the actual objects.
It is useful for frequently executed queries.
Must be enabled using configuration and setCacheable(true) in queries.

Summary:

First-Level Cache: Default, session-scoped.
Second-Level Cache: Optional, shared across sessions.
Query Cache: Optional, stores query results for optimization.

Together, these caching levels improve performance, minimize redundant queries, and reduce database load.

Would you like me to also create a diagram-style explanation of Hibernate caching levels for quick revision?

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