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class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/latest/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/tutorials/index.html">Quickstart (local)</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 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href="/docs/latest/querying/sorting-orders.html">String comparators</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/querying/virtual-columns.html">Virtual columns</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/development/geo.html">Spatial filters</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Configuration<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/latest/configuration/index.html">Configuration reference</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/development/extensions.html">Extensions</a></li><li class="navListItem"><a class="navItem" href="/docs/latest/configuration/logging.html">Logging</a></li></ul></div><div 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| <h2><a class="anchor" aria-hidden="true" id="overwrite"></a><a href="#overwrite" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Overwrite</h2> |
| <p>Apache Druid stores data <a href="/docs/latest/design/architecture.html#datasources-and-segments">partitioned by time chunk</a> and supports |
| overwriting existing data using time ranges. Data outside the replacement time range is not touched. Overwriting of |
| existing data is done using the same mechanisms as <a href="/docs/latest/ingestion/index.html#batch">batch ingestion</a>.</p> |
| <p>For example:</p> |
| <ul> |
| <li><a href="/docs/latest/ingestion/native-batch.html">Native batch</a> with <code>appendToExisting: false</code>, and <code>intervals</code> set to a specific |
| time range, overwrites data for that time range.</li> |
| <li><a href="/docs/latest/multi-stage-query/reference.html#replace">SQL <code>REPLACE <table> OVERWRITE [ALL | WHERE ...]</code></a> overwrites data for |
| the entire table or for a specified time range.</li> |
| </ul> |
| <p>In both cases, Druid's atomic update mechanism ensures that queries will flip seamlessly from the old data to the new |
| data on a time-chunk-by-time-chunk basis.</p> |
| <p>Ingestion and overwriting cannot run concurrently for the same time range of the same datasource. While an overwrite job |
| is ongoing for a particular time range of a datasource, new ingestions for that time range are queued up. Ingestions for |
| other time ranges proceed as normal. Read-only queries also proceed as normal, using the pre-existing version of the |
| data.</p> |
| <blockquote> |
| <p>Druid does not support single-record updates by primary key.</p> |
| </blockquote> |
| <h2><a class="anchor" aria-hidden="true" id="reindex"></a><a href="#reindex" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Reindex</h2> |
| <p>Reindexing is an <a href="#overwrite">overwrite of existing data</a> where the source of new data is the existing data itself. It |
| is used to perform schema changes, repartition data, filter out unwanted data, enrich existing data, and so on. This |
| behaves just like any other <a href="#overwrite">overwrite</a> with regard to atomic updates and locking.</p> |
| <p>With <a href="/docs/latest/ingestion/native-batch.html">native batch</a>, use the <a href="/docs/latest/ingestion/native-batch-input-sources.html#druid-input-source"><code>druid</code> input |
| source</a>. If needed, |
| <a href="/docs/latest/ingestion/ingestion-spec.html#transformspec"><code>transformSpec</code></a> can be used to filter or modify data during the |
| reindexing job.</p> |
| <p>With SQL, use <a href="/docs/latest/multi-stage-query/reference.html#replace"><code>REPLACE <table> OVERWRITE</code></a> with <code>SELECT ... FROM <table></code>. |
| (Druid does not have <code>UPDATE</code> or <code>ALTER TABLE</code> statements.) Any SQL SELECT query can be used to filter, |
| modify, or enrich the data during the reindexing job.</p> |
| <h2><a class="anchor" aria-hidden="true" id="rolled-up-datasources"></a><a href="#rolled-up-datasources" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Rolled-up datasources</h2> |
| <p>Rolled-up datasources can be effectively updated using appends, without rewrites. When you append a row that has an |
| identical set of dimensions to an existing row, queries that use aggregation operators automatically combine those two |
| rows together at query time.</p> |
| <p><a href="/docs/latest/data-management/compaction.html">Compaction</a> or <a href="/docs/latest/data-management/automatic-compaction.html">automatic compaction</a> can be used to physically combine these |
| matching rows together later on, by rewriting segments in the background.</p> |
| <h2><a class="anchor" aria-hidden="true" id="lookups"></a><a href="#lookups" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Lookups</h2> |
| <p>If you have a dimension where values need to be updated frequently, try first using <a href="/docs/latest/querying/lookups.html">lookups</a>. A |
| classic use case of lookups is when you have an ID dimension stored in a Druid segment, and want to map the ID dimension to a |
| human-readable string that may need to be updated periodically.</p> |
| </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/latest/data-management/index.html"><span class="arrow-prev">← </span><span>Overview</span></a><a class="docs-next button" href="/docs/latest/data-management/delete.html"><span>Data deletion</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#overwrite">Overwrite</a></li><li><a href="#reindex">Reindex</a></li><li><a href="#rolled-up-datasources">Rolled-up datasources</a></li><li><a href="#lookups">Lookups</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/latest/">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2022 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script><script> |
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