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| <section id="durable-memory" class="page-section"> |
| <h1 class="first">Durable Memory</h1> |
| <div class="col-sm-12 col-md-12 col-xs-12" style="padding-left:0; padding-right:0;"> |
| <div class="col-sm-6 col-md-7 col-xs-12" style="padding-left:0; padding-right:0;"> |
| <p> |
| Apache Ignite is based on the <nobr>Durable Memory</nobr> |
| architecture that allows storing and processing data and indexes both in memory and on disk |
| when the <a href="/arch/persistence.html">Ignite Native Persistence</a> feature is enabled. |
| </p> |
| <p> |
| The durable memory architecture helps achieve the performance and scale of in-memory computing |
| together with the disk durability and strong consistency in one system. |
| </p> |
| </div> |
| |
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| <img class="img-responsive" src="/images/durable_memory.png" width="440px" style="float:right;"/> |
| </div> |
| </div> |
| <p> |
| Ignite's Durable Memory operates in a way similar to the Virtual Memory of operating systems |
| such as Linux. However, one significant difference between these two is that the Durable Memory, |
| in addition to keeping the whole or partial data set in memory, always keeps the whole data set with |
| indexes on disk (assuming that Ignite Native Persistence is enabled), while Virtual Memory uses the |
| disk when it runs out of RAM, for swapping purposes only. |
| </p> |
| |
| <p> |
| Following are the advantages and characteristics of Apache Ignite as a platform when Durable Memory |
| and Ignite Native Persistence are used together: |
| </p> |
| <div class="col-sm-6 col-md-6 col-xs-12" style="padding-left:0; padding-right:0;"> |
| <div class="page-heading">In-Memory</div> |
| <ul class="page-list"> |
| <li>Off-Heap memory</li> |
| <li>Removes noticeable GC pauses</li> |
| <li>Automatic Defragmentation</li> |
| <li>Predictable memory consumption</li> |
| <li>Boosts SQL performance</li> |
| </ul> |
| </div> |
| <div class="col-sm-6 col-md-6 col-xs-12" style="padding-left:0; padding-right:0;"> |
| <div class="page-heading">On Disk</div> |
| <ul class="page-list"> |
| <li>Optional Persistence</li> |
| <li>Support of flash, SSD, Intel 3D Xpoint</li> |
| <li>Stores superset of data</li> |
| <li>Fully Transactional</li> |
| <ul> |
| <li>Write-Ahead-Log (WAL)</li> |
| </ul> |
| <li>Instantaneous Cluster Restarts</li> |
| </ul> |
| </div> |
| <p>Read more on the <a href="https://apacheignite.readme.io/docs/durable-memory" target="_blank">main documentation page</a>.</p> |
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