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Acrolinx updates
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articles/synapse-analytics/sql-data-warehouse/sql-data-warehouse-concept-recommendations.md

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Advisor continuously leverages workload-based heuristics such as table access frequency, rows returned on average, and thresholds around data warehouse size and activity to ensure high-quality recommendations are generated.
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The following describes workload-based heuristics you may find in the Azure portal for each replicated table recommendation:
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The following section describes workload-based heuristics you may find in the Azure portal for each replicated table recommendation:
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- Scan avg- the average percent of rows that were returned from the table for each table access over the past seven days
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- Frequent read, no update - indicates that the table has not been updated in the past seven days while showing access activity
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- Read/update ratio - the ratio of how frequent the table was accessed relative to when it gets updated over the past seven days
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- Activity - measures the usage based on access activity. This compares the table access activity relative to the average table access activity across the data warehouse over the past seven days.
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- Activity - measures the usage based on access activity. This activity compares the table access activity relative to the average table access activity across the data warehouse over the past seven days.
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Currently Advisor will only show at most four replicated table candidates at once with clustered columnstore indexes prioritizing the highest activity.
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## Tempdb contention
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Query performance can degrade when there is high tempdb contention. Tempdb contention can occur via user defined temporary tables or when there is a large amount of data movement. For this scenario, you can scale for more tempdb allocation and [configure resource classes and workload managemen](https://docs.microsoft.com/azure/synapse-analytics/sql-data-warehouse/sql-data-warehouse-workload-management)t to provide more memory to your queries.
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Query performance can degrade when there is high tempdb contention. Tempdb contention can occur via user-defined temporary tables or when there is a large amount of data movement. For this scenario, you can scale for more tempdb allocation and [configure resource classes and workload management](https://docs.microsoft.com/azure/synapse-analytics/sql-data-warehouse/sql-data-warehouse-workload-management) to provide more memory to your queries.

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