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| <div class="left-nav__overlay"></div> |
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| <article data-swiftype-index='true'> |
| <a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/key-value-api/continuous-queries.adoc" target="_blank">Edit</a> |
| |
| <h1>Using Continuous Queries</h1> |
| |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>A continuous query is a query that monitors data modifications occurring in a cache. |
| Once a continuous query is started, you get notified of all the data changes that fall into your query filter.</p> |
| </div> |
| <div class="paragraph"> |
| <p>All update events are propagated to the <a href="#local-listener">local listener</a> that must be registered in the query. |
| Continuous query implementation guarantees exactly once delivery of an event to the local listener.</p> |
| </div> |
| <div class="paragraph"> |
| <p>You can also specify a remote filter to narrow down the range of entries that are monitored for updates.</p> |
| </div> |
| <div class="admonitionblock caution"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <div class="title">Caution</div> |
| </td> |
| <td class="content"> |
| <h3 id="continuous-queries-and-mvcc" class="discrete">Continuous Queries and MVCC</h3> |
| <div class="paragraph"> |
| <p>Continuous queries have a number of <a href="/docs/2.10.0/transactions/mvcc">functional limitations</a> when used with MVCC-enabled caches.</p> |
| </div> |
| </td> |
| </tr> |
| </table> |
| </div> |
|