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| <!DOCTYPE html> |
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| <head> |
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| <link rel="canonical" href="https://ignite.apache.org/use-cases/caching/hibernate-l2-cache.html" /> |
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| <meta charset="utf-8"> |
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| <title>Hibernate Second-Level Cache Use Case - Apache Ignite</title> |
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| <body> |
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| <article> |
| <header> |
| <div class="container"> |
| <h1 >Second-Level Cache <strong>for Hibernate</strong></h1> |
| </div> |
| </header> |
| |
| <div class="container"> |
| <p> |
| Hibernate stores data in first-level (L1) cache to minimize expensive database requests. However, |
| this data is cached per Hibernate session and is not shared among threads. A common solution here is |
| to configure a second-level (L2) cache. |
| </p> |
| <img class="img-responsive diagram-right" src="/images/hibernate-L2-cache.png" alt="Second-Level Cache for Hibernate" /> |
| <p> |
| Ignite In-Memory Data Grid can be plugged in as Hibernate second-level (L2) cache. |
| Accessible by all sessions, Ignite Data Grid can significantly accelerate the performance of your |
| application by reducing the data access time. |
| </p> |
| <h2>How Hibernate Caching Works</h2> |
| <p> |
| Hibernate first-level (L1) cache is associated with the session object, the scope of which |
| is limited to a single session. Objects cached in one session are not shared with another, |
| which means that a request for the same entity by another session |
| will still go to the database. |
| </p> |
| |
| |
| <h2>Ignite as Hibernate L2 Cache</h2> |
| <p> |
| To overcome the issue of per-session cache, a global second-level (L2) cache can be configured, |
| in which cached objects are visible to all sessions. This usually gives a significantly greater |
| performance gain since each newly created session now has access to the data already present in |
| the L2 cache memory. |
| </p> |
| <p> |
| Apache Ignite can be plugged-in as Hibernate L2 cache implementation, and can be used in all access |
| modes - <code>READ_ONLY</code>, <code>READ_WRITE</code>, <code>NONSTRICT_READ_WRITE</code>, and |
| <code>TRANSACTIONAL</code>, supporting a wide range of related features: |
| <ul class="page-list"> |
| <li>On-Heap and Off-Heap in-memory stores, as well as disk overflow.</li> |
| <li>Cache transactions, that make <code>TRANSACTIONAL</code> mode possible.</li> |
| <li>Clustering, with 2 different replication modes: <code>REPLICATED</code> and <code>PARTITIONED</code></li> |
| </ul> |
| </p> |
| <p> |
| <a href="https://apacheignite-mix.readme.io/docs/hibernate-l2-cache"> |
| <b>Configure Hibernate L2 Cache <i class="fas fa-angle-double-right"></i></b> |
| </a> |
| </p> |
| </div> |
| </article> |
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