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View Capacity Utilization in Analytics Platform System

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This article explains how to view capacity utilization in the SQL Server Parallel Data Warehouse (PDW) appliance.

To View Capacity Utilization By Using Admin Console

To view the space used, open the Admin Console, and select the Storage tab. There's a Storage tab for the PDW region.

Screenshot shows P D W Admin Console Storage page.

To View Capacity Utilization By Using Queries

To understand if a node is running low on space, the SQL Server PDW health monitoring system already monitors the free space for all volumes within each node.

If the free space within a volume drops below 30 percent, SQL Server PDW generates a warning alert in sys.dm_pdw_component_health_active_alerts. The alert remains until free space is made available.

If the free space within a volume drops under 10 percent, SQL Server PDW generates a critical alert. This situation is considered critical because queries could fail if they cause the database to expand.

To retrieve volume usage, see the following example.

SELECT   
    space.[pdw_node_id] ,  
    space.[node_name] ,  
    MAX(space.[volume_name]) AS 'volume_name' ,  
    MAX(space.[volume_size_mb]) AS 'volume_size_mb' ,  
    MAX(space.[free_space_mb]) AS 'free_space_mb' ,  
   (MAX(space.[volume_size_mb]) - MAX(space.[free_space_mb])) AS 'space_utilized'  
FROM (  
    SELECT   
        s.[pdw_node_id],  
        n.[name] AS [node_name],  
        (CASE WHEN p.property_name = 'volume_name'   
            THEN s.[property_value] ELSE NULL END) AS 'volume_name' ,  
        (CASE WHEN p.property_name = 'volume_size'   
            THEN (CAST(ISNULL(s.[property_value], '0') AS BIGINT)/1024/1024)   
            ELSE 0 END) AS 'volume_size_mb' ,  
        (CASE WHEN p.property_name = 'volume_free_space'   
            THEN (CAST(ISNULL(s.[property_value], '0') AS BIGINT)/1024/1024)   
            ELSE 0 END) AS 'free_space_mb' , s.[component_instance_id]  
    FROM [sys].[dm_pdw_component_health_status] AS s  
        JOIN sys.dm_pdw_nodes AS n   
            ON s.[pdw_node_id] = n.[pdw_node_id]  
        JOIN [sys].[pdw_health_components] AS c   
            ON s.[component_id] = c.[component_id]  
        JOIN [sys].[pdw_health_component_properties] AS p   
            ON s.[property_id] = p.[property_id] AND s.[component_id] = p.[component_id]  
    WHERE  
        c.[Component_name] = 'Volume'  
        AND p.[property_name] IN ('volume_name', 'volume_free_space', 'volume_size')  
    ) AS space  
GROUP BY space.[pdw_node_id] , space.[node_name] , space.[component_instance_id]  
ORDER BY space.[pdw_node_id], MAX(space.[volume_name]);

To retrieve the space used by databases across the appliance nodes, see the following example.

SELECT   
    [pdw_node_id],   
    [db_name],   
    SUM(CASE WHEN [file_type] = 'DATA' THEN [value_MB] ELSE 0 END) AS [DataSizeMB],  
    SUM(CASE WHEN [file_type] = 'LOG' THEN [value_MB] ELSE 0 END) AS [LogSizeMB],  
    SUM([value_MB]) AS [TotalMB]  
FROM (  
    SELECT   
        pc.[pdw_node_id],   
        RTRIM(pc.[counter_name]) AS [counter_name],   
        ISNULL(d.[name], pc.[instance_name]) AS [db_name],   
        pc.[cntr_value]/1024 AS [value_MB],  
        CASE   
            WHEN [counter_name] LIKE 'Data File(s) Size%'   
            THEN 'DATA'   
            ELSE 'LOG'   
        END AS [file_type]  
    FROM sys.dm_pdw_nodes_os_performance_counters AS pc  
        LEFT JOIN sys.pdw_database_mappings AS dm   
            ON pc.instance_name = dm.physical_name  
        INNER JOIN sys.databases AS d   
            ON d.database_id = dm.database_id  
    WHERE   
        ([counter_name] LIKE 'Log File(s) Size%'  
             OR [counter_name] LIKE 'Data File(s) Size%')  
        AND (d.[name] <> dm.[physical_name]   
             OR pc.[instance_name] = 'tempdb')  
) AS db  
GROUP BY [pdw_node_id], [db_name]  
ORDER BY [db_name], [pdw_node_id];

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