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Copy file name to clipboardExpand all lines: docs/analytics-platform-system/determine-polling-frequency.md
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@@ -4,16 +4,16 @@ description: This article explains how to determine the polling frequency for An
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author: charlesfeddersen
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ms.author: charlesf
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ms.reviewer: martinle
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ms.date: 04/17/2018
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ms.date: 12/04/2023
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ms.service: sql
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ms.subservice: data-warehouse
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ms.topic: conceptual
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---
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# Determine Polling Frequency
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# Determine polling frequency
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This article explains how to determine the polling frequency for Analytics Platform System appliance alerts.
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## To Determine the Polling Frequency
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## <aid="to-determine-the-polling-frequency"></a> Determine the Polling Frequency
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Since PDW does not currently support proactive notifications when alerts occur, the monitoring solution needs to continuously poll the appliance DLLs. Internally, PDW polls the components at different intervals:
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- Cluster - 60 seconds
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- Performance counters - three seconds
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A common interval to poll for alerts, which is also used by System Center, is **every 15 minutes**. Obviously, you could query more or less frequently, but it is not recommended to poll less than every six hours.
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A common interval to poll for alerts, which is also used by System Center Operations Manager, is **every 15 minutes**. Obviously, you could query more or less frequently, but it is not recommended to poll less than every six hours.
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Polling more frequently is acceptable, but polling too frequently can clutter the [sys.dm_pdw_nodes_exec_requests](../relational-databases/system-dynamic-management-views/sys-dm-exec-requests-transact-sql.md) DMV. Polling too frequently can make it difficult for users to diagnose query performance issues when their quickly rolls out of view.
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Polling more frequently is acceptable, but polling too frequently can clutter the [sys.dm_pdw_nodes_exec_requests](../relational-databases/system-dynamic-management-views/sys-dm-exec-requests-transact-sql.md) DMV. Polling too frequently can make it difficult for users to diagnose query performance issues when their quickly rolls out of view.
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## See Also
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## Related content
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-[Monitor the appliance with system views - Analytics Platform System](monitor-the-appliance-by-using-system-views.md)
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