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Merge pull request #84911 from stversch/patch-4
Update what-is-a-data-warehouse-unit-dwu-cdwu.md
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articles/synapse-analytics/sql-data-warehouse/what-is-a-data-warehouse-unit-dwu-cdwu.md

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- Linearly changes performance of the system for scans, aggregations, and CTAS statements
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- Increases the number of readers and writers for PolyBase load operations
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- Increases the maximum number of concurrent queries and concurrency slots.
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- Increases the maximum number of concurrent queries and concurrency slots
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## Service Level Objective
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Both DWUs and cDWUs support scaling compute up or down, and pausing compute when you don't need to use the data warehouse. These operations are all on-demand. Gen2 uses a local disk-based cache on the compute nodes to improve performance. When you scale or pause the system, the cache is invalidated and so a period of cache warming is required before optimal performance is achieved.
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Each SQL server (for example, myserver.database.windows.net) has a [Database Transaction Unit (DTU)](../../azure-sql/database/service-tiers-dtu.md) quota that allows a specific number of data warehouse units. For more information, see the [workload management capacity limits](sql-data-warehouse-service-capacity-limits.md#workload-management).
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## Capacity limits
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Each SQL server (for example, myserver.database.windows.net) has a [Database Transaction Unit (DTU)](../../azure-sql/database/service-tiers-dtu.md?bc=%2fazure%2fsynapse-analytics%2fbreadcrumb%2ftoc.json&toc=%2fazure%2fsynapse-analytics%2ftoc.json) quota that allows a specific number of data warehouse units. For more information, see the [workload management capacity limits](sql-data-warehouse-service-capacity-limits.md#workload-management).

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