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| <meta charset="utf-8"> |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| <title>Ignite for RDBMS Users</title> |
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| <main id="main" role="main" class="container"> |
| <section id="sql-queries" class="page-section"> |
| <h1 class="first">Ignite for RDBMS Users</h1> |
| <div style="padding:0 0 20px 0;"> |
| <p> |
| Apache Ignite does not require you as a skilled RDBMS user to learn new APIs if you want to |
| start working with an Ignite cluster. All the data processing and SQL schema definition can |
| be accomplished with a familiar SQL syntax. Ignite complies with SQL ANSI-99 standard supporting all |
| <b>SQL</b> and <b>DML</b> commands, including SELECT, UPDATE, INSERT, MERGE, DELETE statements and |
| distributed joins. It also provides support for a subset of <b>DDL</b> commands relevant for |
| distributed SQL databases. |
| </p> |
| <p> |
| Ignite can store data and indexes both in memory and on disk which allows executing distributed SQL |
| queries across different memory layers achieving the performance and scale of in-memory computing |
| together with the disk durability and strong consistency in one system. If the persistence is disabled, |
| Ignite can act as a pure <a href="/use-cases/database/in-memory-database.html"> |
| in-memory database</a>. |
| </p> |
| </div> |
| |
| <section id="comparison-matrix-section" class="page-section" style="border: none"> |
| <table class="comparison-matrix" name="comparison-matrix"> |
| <thead> |
| <tr><th>Feature</th><th>RDBMS</th><th>Ignite</th></tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>Scalability</td> |
| <td><span class="cross-mark">✗</span> vertical</td> |
| <td class="highlight-ignite-comparison"><span class="check-mark">✓</span> horizontal</b></td> |
| </tr> |
| <tr> |
| <td>Availability</td> |
| <td><span class="cross-mark">✗</span> failover only</td> |
| <td class="highlight-ignite-comparison"><span class="check-mark">✓</span> high</b></td> |
| </tr> |
| <tr> |
| <td>Consistency</td> |
| <td><span class="check-mark">✓</span> strong</td> |
| <td class="highlight-ignite-comparison"><span class="check-mark">✓</span> strong</b></td> |
| </tr> |
| <tr> |
| <td>In-Memory</td> |
| <td><span class="check-mark">✓</span> caching only</td> |
| <td class="highlight-ignite-comparison"><span class="check-mark">✓</span> in-memory store</b></td> |
| </tr> |
| <tr> |
| <td>Persistence</td> |
| <td><span class="check-mark">✓</span></td> |
| <td class="highlight-ignite-comparison"><span class="check-mark">✓</span></b></td> |
| </tr> |
| <tr> |
| <td>SQL</td> |
| <td><span class="check-mark">✓</span></td> |
| <td class="highlight-ignite-comparison"><span class="check-mark">✓</span></b></td> |
| </tr> |
| <tr> |
| <td>Key-Value</td> |
| <td><span class="cross-mark">✗</span></td> |
| <td class="highlight-ignite-comparison"><span class="check-mark">✓</span></b></td> |
| </tr> |
| <tr> |
| <td>Collocated Processing</td> |
| <td><span class="cross-mark">✗</span></td> |
| <td class="highlight-ignite-comparison"><span class="check-mark">✓</span></b></td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <table class="comparison-matrix-mobile" name="comparison-matrix-sm"> |
| <thead> |
| <tr><th>Scalability</th></tr> |
| </thead> |
| <tbody> |
| <tr><td><span class="left">RDBMS</span><span class="right"><span class="cross-mark">✗</span> vertical</span></td></tr> |
| <tr class="ignite"><td><span class="left"><b>Ignite</b></span><span class="right"><span class="check-mark">✓</span> <b>horizontal</b></span></td></tr> |
| </tbody> |
| <thead> |
| <tr><th>Availability</th></tr> |
| </thead> |
| <tbody> |
| <tr><td><span class="left">RDBMS</span><span class="right"><span class="cross-mark">✗</span> failover only</span></td></tr> |
| <tr class="ignite"><td><span class="left"><b>Ignite</b></span><span class="right"><span class="check-mark">✓</span> <b>high</b></span></td></tr> |
| </tbody> |
| <thead> |
| <tr><th>Consistency</th></tr> |
| </thead> |
| <tbody> |
| <tr><td><span class="left">RDBMS</span><span class="right"><span class="check-mark">✓</span> strong</span></td></tr> |
| <tr class="ignite"><td><span class="left"><b>Ignite</b></span><span class="right"><span class="check-mark">✓</span> <b>strong</b></span></td></tr> |
| </tbody> |
| <thead> |
| <tr><th>In-Memory</th></tr> |
| </thead> |
| <tbody> |
| <tr><td><span class="left">RDBMS</span><span class="right"><span class="check-mark">✓</span> caching only</span></td></tr> |
| <tr class="ignite"><td><span class="left"><b>Ignite</b></span><span class="right"><span class="check-mark">✓</span> <b>in-memory store</b></span></td></tr> |
| </tbody> |
| <thead> |
| <tr><th>Persistence</th></tr> |
| </thead> |
| <tbody> |
| <tr><td><span class="left">RDBMS</span><span class="right"><span class="check-mark">✓</span></span></td></tr> |
| <tr class="ignite"><td><span class="left"><b>Ignite</b></span><span class="right"><span class="check-mark">✓</span></span></td></tr> |
| </tbody> |
| <thead> |
| <tr><th>SQL</th></tr> |
| </thead> |
| <tbody> |
| <tr><td><span class="left">RDBMS</span><span class="right"><span class="check-mark">✓</span></span></td></tr> |
| <tr class="ignite"><td><span class="left"><b>Ignite</b></span><span class="right"><span class="check-mark">✓</span></span></td></tr> |
| </tbody> |
| <thead> |
| <tr><th>Key-Value</th></tr> |
| </thead> |
| <tbody> |
| <tr><td><span class="left">RDBMS</span><span class="right"><span class="cross-mark">✗</span></span></td></tr> |
| <tr class="ignite"><td><span class="left"><b>Ignite</b></span><span class="right"><span class="check-mark">✓</span></span></td></tr> |
| </tbody> |
| <thead> |
| <tr><th>Collocated-Processing</th></tr> |
| </thead> |
| <tbody> |
| <tr><td><span class="left">RDBMS</span><span class="right"><span class="cross-mark">✗</span></span></td></tr> |
| <tr class="ignite"><td><span class="left"><b>Ignite</b></span><span class="right"><span class="check-mark">✓</span></span></td></tr> |
| </tbody> |
| </table> |
| </section> |
| |
| <p> |
| The main difference between Ignite and traditional relational databases is that, first, the memory is |
| treated as a fully functional storage, not just as a caching layer, like most databases do. Second, |
| Ignite is horizontally scalable, highly available and supports both |
| <a href="/features/datagrid.html">key-value</a> APIs and |
| <a href="/features/collocatedprocessing.html">collocated processing</a> approach. |
| </p> |
| |
| <p> |
| Check <a href="/features/sql.html">SQL</a> section for more details or start using |
| Ignite as a SQL database referring to |
| <a href="https://apacheignite-sql.readme.io/docs" target="_blank">SQL Getting Started Guide</a>. |
| Also, learn how Ignite is used for <a href="/use-cases/caching/database-caching.html"> |
| relational databases acceleration</a>. |
| </p> |
| </section> |
| </main> |
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