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articles/sentinel/investigate-large-datasets.md

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title: Start an investigation by searching large datasets - Microsoft Sentinel
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description: Learn about search jobs and restoring archived data in Microsoft Sentinel.
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description: Learn about search jobs and restoring data from long-term retention in Microsoft Sentinel.
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author: cwatson-cat
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ms.topic: conceptual
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ms.date: 03/03/2024
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ms.collection: usx-security
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#Customer intent: As a security analyst, I want to search and restore archived log data so that I can conduct thorough investigations on historical events.
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#Customer intent: As a security analyst, I want to search and restore log data from long-term retention so that I can conduct thorough investigations on historical events.
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See [Search job limitations](/azure/azure-monitor/logs/search-jobs#limitations) in the Azure Monitor documentation.
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## Restore historical data from archived logs
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## Restore log data from long-term retention
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When you need to do a full investigation on data stored in archived logs, restore a table from the **Search** page in Microsoft Sentinel. Specify a target table and time range for the data you want to restore. Within a few minutes, the log data is restored and available within the Log Analytics workspace. Then you can use the data in high-performance queries that support full KQL.
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When you need to do a full investigation on log data in long-term retention, restore a table from the **Search** page in Microsoft Sentinel. Specify a target table and time range for the data you want to restore. Within a few minutes, the log data is restored and available within the Log Analytics workspace. Then you can use the data in high-performance queries that support full KQL.
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A restored log table is available in a new table that has a *_RST suffix. The restored data is available as long as the underlying source data is available. But you can delete restored tables at any time without deleting the underlying source data. To save costs, we recommend you delete the restored table when you no longer need it.
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### Limitations of log restore
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Before you start to restore an archived log table, be aware of the following limitations:
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- Restore data for a minimum of two days.
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- Restore data more than 14 days old.
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- Restore up to 60 TB.
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- Restore is limited to one active restore per table.
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- Restore up to four archived tables per workspace per week.
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- Limited to two concurrent restore jobs per workspace.
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To learn more, see [Restore logs in Azure Monitor](/azure/azure-monitor/logs/restore).
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See [Restore limitations](/azure/azure-monitor/logs/restore#limitations) in the Azure Monitor documentation.
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## Bookmark search results or restored data rows
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## Next steps
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- [Search across long time spans in large datasets](search-jobs.md)
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- [Restore archived logs from search](restore.md)
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- [Restore logs from long-term retention](restore.md)

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