hibernate 2nd level cache

Deepika Sahu answered on December 15, 2022 Popularity 8/10 Helpfulness 2/10

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hibernate 2nd level cache

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Conversely, a second-level cache is SessionFactory-scoped, meaning it's shared by all sessions created with the same session factory. When an entity instance is looked up by its id (either by application logic or by Hibernate internally, e.g. when it loads associations to that entity from other entities), and second-level caching is enabled for that entity, the following happens:

If an instance is already present in the first-level cache, it's returned from there.
If an instance isn't found in the first-level cache, and the corresponding instance state is cached in the second-level cache, then the data is fetched from there and an instance is assembled and returned.
Otherwise, the necessary data are loaded from the database and an instance is assembled and returned.
Once the instance is stored in the persistence context (first-level cache), it's returned from there in all subsequent calls within the same session until the session is closed, or the instance is manually evicted from the persistence context. The loaded instance state is also stored in the L2 cache if it wasn't already there.

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Contributed on Dec 15 2022

Deepika Sahu

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@Entity
@Cacheable
@org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class Foo {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    private long id;

    @Column(name = "NAME")
    private String name;
    
    // getters and setters
}
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Contributed on Dec 15 2022

Deepika Sahu

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hibernate 2nd level cache

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