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.55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item"><a class="breadcrumbs__link" itemprop="item" href="/docs/category/features"><span itemprop="name">Features</span></a><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Schema history</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Next</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Schema History</h1><div class="availabilityCard_P5od card"><strong>Feature Availability</strong><div><span class="platform_wqXv platformAvailable_Y8lN">Self-Hosted DataHub <span role="img" aria-label="check-circle" class="anticon anticon-check-circle"><svg viewBox="64 64 896 896" focusable="false" data-icon="check-circle" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M512 64C264.6 64 64 264.6 64 512s200.6 448 448 448 448-200.6 448-448S759.4 64 512 64zm193.5 301.7l-210.6 292a31.8 31.8 0 01-51.7 0L318.5 484.9c-3.8-5.3 0-12.7 6.5-12.7h46.9c10.2 0 19.9 4.9 25.9 13.3l71.2 98.8 157.2-218c6-8.3 15.6-13.3 25.9-13.3H699c6.5 0 10.3 7.4 6.5 12.7z"></path></svg></span></span></div><div><span role="img" aria-label="cloud" class="anticon anticon-cloud managedIcon_AxXO"><svg viewBox="64 64 896 896" focusable="false" data-icon="cloud" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M811.4 418.7C765.6 297.9 648.9 212 512.2 212S258.8 297.8 213 418.6C127.3 441.1 64 519.1 64 612c0 110.5 89.5 200 199.9 200h496.2C870.5 812 960 722.5 960 612c0-92.7-63.1-170.7-148.6-193.3zm36.3 281a123.07 123.07 0 01-87.6 36.3H263.9c-33.1 0-64.2-12.9-87.6-36.3A123.3 123.3 0 01140 612c0-28 9.1-54.3 26.2-76.3a125.7 125.7 0 0166.1-43.7l37.9-9.9 13.9-36.6c8.6-22.8 20.6-44.1 35.7-63.4a245.6 245.6 0 0152.4-49.9c41.1-28.9 89.5-44.2 140-44.2s98.9 15.3 140 44.2c19.9 14 37.5 30.8 52.4 49.9 15.1 19.3 27.1 40.7 35.7 63.4l13.8 36.5 37.8 10c54.3 14.5 92.1 63.8 92.1 120 0 33.1-12.9 64.3-36.3 87.7z"></path></svg></span><span class="platform_wqXv platformAvailable_Y8lN">DataHub Cloud <span role="img" aria-label="check-circle" class="anticon anticon-check-circle"><svg viewBox="64 64 896 896" focusable="false" data-icon="check-circle" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M512 64C264.6 64 64 264.6 64 512s200.6 448 448 448 448-200.6 448-448S759.4 64 512 64zm193.5 301.7l-210.6 292a31.8 31.8 0 01-51.7 0L318.5 484.9c-3.8-5.3 0-12.7 6.5-12.7h46.9c10.2 0 19.9 4.9 25.9 13.3l71.2 98.8 157.2-218c6-8.3 15.6-13.3 25.9-13.3H699c6.5 0 10.3 7.4 6.5 12.7z"></path></svg></span></span></div></div><p>Schema History is a valuable tool for understanding how a Dataset changes over time and gives insight into the following cases,
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along with informing Data Practitioners when these changes happened.</p><ul><li>A new field is added</li><li>An existing field is removed</li><li>An existing field changes type</li></ul><p>Schema History uses DataHub's <a href="/docs/dev-guides/timeline/">Timeline API</a> to compute schema changes.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="schema-history-setup-prerequisites-and-permissions">Schema History Setup, Prerequisites, and Permissions<a href="#schema-history-setup-prerequisites-and-permissions" class="hash-link" aria-label="Direct link to Schema History Setup, Prerequisites, and Permissions" title="Direct link to Schema History Setup, Prerequisites, and Permissions"></a></h2><p>Schema History is viewable in the DataHub UI for any Dataset that has had at least one schema change. To view a Dataset, a user
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must have the <strong>View Entity Page</strong> privilege, or be assigned to <strong>any</strong> DataHub Role.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="using-schema-history">Using Schema History<a href="#using-schema-history" class="hash-link" aria-label="Direct link to Using Schema History" title="Direct link to Using Schema History"></a></h2><p>You can view the Schema History for a Dataset by navigating to that Dataset's Schema Tab. As long as that Dataset has more than
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one version, you can view what a Dataset looked like at any given version by using the version selector.
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Here's an example from DataHub's official Demo environment with the</p><a href="https://demo.datahub.com/dataset/urn:li:dataset:(urn:li:dataPlatform:snowflake,long_tail_companions.adoption.pets,PROD)/Schema?is_lineage_mode=false" target="_blank" rel="noopener noreferrer">Snowflake pets dataset</a>.<p align="center"><img loading="lazy" width="70%" src="https://raw.githubusercontent.com/datahub-project/static-assets/main/imgs/schema-history-latest-version.png" class="img_ev3q"></p><p>If you click on an older version in the selector, you'll be able to see what the schema looked like back then. Notice
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the changes here to the glossary terms for the <code>status</code> field, and to the descriptions for the <code>created_at</code> and <code>updated_at</code>
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fields.</p><p align="center"><img loading="lazy" width="70%" src="https://raw.githubusercontent.com/datahub-project/static-assets/main/imgs/schema-history-older-version.png" class="img_ev3q"></p><p>In addition to this, you can also toggle the Audit view that shows you when the most recent changes were made to each field.
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You can active this by clicking on the Audit icon you see above the top right of the table.</p><p align="center"><img loading="lazy" width="70%" src="https://raw.githubusercontent.com/datahub-project/static-assets/main/imgs/schema-history-audit-activated.png" class="img_ev3q"></p><p>You can see here that some of these fields were added at the oldest dataset version, while some were added only at this latest
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version. Some fields were even modified and had a type change at the latest version!</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="graphql">GraphQL<a href="#graphql" class="hash-link" aria-label="Direct link to GraphQL" title="Direct link to GraphQL"></a></h3><ul><li><a href="/docs/graphql/queries#getSchemaBlame">getSchemaBlame</a></li><li><a href="/docs/graphql/queries#getSchemaVersionList">getSchemaVersionList</a></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="faq-and-troubleshooting">FAQ and Troubleshooting<a href="#faq-and-troubleshooting" class="hash-link" aria-label="Direct link to FAQ and Troubleshooting" title="Direct link to FAQ and Troubleshooting"></a></h2><p><strong>What updates are planned for the Schema History feature?</strong></p><p>In the future, we plan on adding the following features</p><ul><li>Supporting a linear timeline view where you can see what changes were made to various schema fields over time</li><li>Adding a diff viewer that highlights the differences between two versions of a Dataset</li></ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="slackUtm_uoBr"><div class="slackUtm_uoBr"><hr>Need more help? 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