可以改进此TSQL查询？
我刚才有一个随机问题，下面这个查询开始误入歧途。不确定这是否是一个侥幸，因为我使用此查询创建报告，并在过去一年中每天至少使用它几次。今天早上我接到了我的SQL DBA的电话，告诉我该查询自周四早上开始运行。查询本身通常需要15到30秒才能运行。
http://i.stack.imgur.com/pMy2d.png
SELECT
AllAlerts.AlertID as AlertID,
Queues.QueueID as QueueID,
Queues.QueueName as QueueName,
AllAlerts.ConnectorID as ConnectorID,
cast( ISNULL(STUFF ( (
select cast(',' as varchar(max)) + Services.Label
from (
SELECT distinct Services.Label
from [ISG_SOI ].[dbo].[SecureServiceCI] as Services
inner join [ISG_SOI ].[dbo].[CIRelationship] as Relationship
on Relationship.BNodeCIID = AllAlerts.CIID
where Services.CIID = Relationship.ServiceCIID
) as Services
for xml path ('')
), 1, 1, ''), '') as CHAR(1000)) as OwnedServices,
SUBSTRING(AllAlerts.DeviceID,
ISNULL(2 + LEN(AllAlerts.DeviceID) - NULLIF(CHARINDEX(',', REVERSE(AllAlerts.DeviceID)), 0), 0),
CASE CHARINDEX(':', AllAlerts.DeviceID) WHEN 0 THEN LEN(AllAlerts.DeviceID) + 1 ELSE CHARINDEX(':', AllAlerts.DeviceID) END -
ISNULL(2 + LEN(AllAlerts.DeviceID) - NULLIF(CHARINDEX(',', REVERSE(AllAlerts.DeviceID)), 0), 0)
) AS CIName,
AllAlerts.DeviceID as DeviceID,
AllAlerts.SituationMessage as Summary,
AllAlerts.AlertDetail as Detail,
AllAlerts.Acknowledged as Acknowledged,
AllAlerts.UserAttribute5 as Occurrences,
"AcknowledgedBy" =
CASE
WHEN AllAlerts.Acknowledged = '1' THEN ISNULL(History.CreatedBy, '')
WHEN AllAlerts.Acknowledged = '0' THEN ' '
END,
AllAlerts.AssignedTo as AssignedTo,
DATEADD(HOUR, DATEDIFF (HH, GETUTCDATE(), GETDATE()), AllAlerts.ReportedTime) as CreatedTime,
DATEADD(HOUR,DATEDIFF (HH, GETUTCDATE(), GETDATE()), AllAlerts.ClearedTime) as ClearedTime,
"Severity" =
CASE
WHEN AllAlerts.Severity = '4' THEN 'Down'
WHEN AllAlerts.Severity = '3' THEN 'Critical'
WHEN AllAlerts.Severity = '2' THEN 'Major'
WHEN AllAlerts.Severity = '1' THEN 'Minor'
END,
AllAlerts.SvcDeskTicket as TicketID,
ISNULL(STUFF ( (
select cast('# ' as varchar(max)) + Notes.AnnotationText + '[' + Notes.CreatedBy + ', ' + cast(Notes.CreatedTime as varchar(max)) + ']'
from [ISG_SOI ].[dbo].[AlertAnnotation] as Notes
where Notes.AlertID = AllAlerts.AlertID
for xml path('')
), 1, 1, ''), '') as Notes
from
[ISG_SOI ].[dbo].[Alerts] as AllAlerts
inner join [ISG_SOI ].[dbo].[AlertQueueAssignments] as QA
on QA.[AlertID] = AllAlerts.[AlertID]
inner join [ISG_SOI ].[dbo].[AlertQueues] AS Queues
on Queues.[QueueID] = QA.[QueueID]
left join
(
select History.AlertID, max(History.CreatedBy) as CreatedBy
from [ISG_SOI ].[dbo].[AlertHistory] as History
where History.ColumnName = '73549'
and History.Currentvalue = 'true'
group by History.AlertID
) as History
on History.AlertID = AllAlerts.AlertID
2 个答案:
答案 0 :(得分：1)
--try this, variant using temp tables
--remove calculation from subquery to temp table
--------------------------------------------------------------------------------
IF OBJECT_ID('tempdb..#History') IS NOT NULL
DROP TABLE #History
SELECT History.AlertID ,
MAX(History.CreatedBy) AS CreatedBy
INTO #History
FROM [ISG_SOI ].[dbo].[AlertHistory] AS History
INNER JOIN [ISG_SOI ].[dbo].[Alerts] AS AllAlerts
ON History.AlertID = AllAlerts.AlertID
WHERE History.ColumnName = '73549'
AND History.Currentvalue = 'true'
GROUP BY History.AlertID
-------------------------------------------------------------------------------------
--XML agregation also is too expensive, reduce time thro removing not required data--
-------------------------------------------------------------------------------------
--1.
IF OBJECT_ID('tempdb..#Services') IS NOT NULL
DROP TABLE #Services
SELECT DISTINCT
Relationship.BNodeCIID ,
[Services].Label
INTO #Services
FROM [ISG_SOI ].[dbo].[SecureServiceCI] AS [Services]
INNER JOIN [ISG_SOI ].[dbo].[CIRelationship] AS Relationship
ON [Services].CIID = Relationship.ServiceCIID
INNER JOIN [ISG_SOI ].[dbo].[Alerts] AS AllAlerts
ON Relationship.BNodeCIID = AllAlerts.CIID
--2.
IF OBJECT_ID('tempdb..#Notes') IS NOT NULL
DROP TABLE #Notes
SELECT Notes.AlertID ,
Notes.AnnotationText ,
Notes.CreatedBy ,
Notes.CreatedTime
INTO #Notes
FROM [ISG_SOI ].[dbo].[AlertAnnotation] AS Notes
INNER JOIN [ISG_SOI ].[dbo].[Alerts] AS AllAlerts
ON Notes.AlertID = AllAlerts.AlertID
--------------------------------------------------------------------------------
SELECT AllAlerts.AlertID AS AlertID ,
Queues.QueueID AS QueueID ,
Queues.QueueName AS QueueName ,
AllAlerts.ConnectorID AS ConnectorID ,
CAST(ISNULL(STUFF(( SELECT CAST(',' AS VARCHAR(MAX))
+ [Services].Label
FROM #Services AS [Services]
WHERE [Services].BNodeCIID = AllAlerts.CIID
FOR
XML PATH('')
), 1, 1, ''), '') AS CHAR(1000)) AS OwnedServices ,
SUBSTRING(AllAlerts.DeviceID,
ISNULL(2 + LEN(AllAlerts.DeviceID)
- NULLIF(CHARINDEX(',',
REVERSE(AllAlerts.DeviceID)),
0), 0),
CASE CHARINDEX(':', AllAlerts.DeviceID)
WHEN 0 THEN LEN(AllAlerts.DeviceID) + 1
ELSE CHARINDEX(':', AllAlerts.DeviceID)
END - ISNULL(2 + LEN(AllAlerts.DeviceID)
- NULLIF(CHARINDEX(',',
REVERSE(AllAlerts.DeviceID)),
0), 0)) AS CIName ,
AllAlerts.DeviceID AS DeviceID ,
AllAlerts.SituationMessage AS Summary ,
AllAlerts.AlertDetail AS Detail ,
AllAlerts.Acknowledged AS Acknowledged ,
AllAlerts.UserAttribute5 AS Occurrences ,
"AcknowledgedBy" = CASE WHEN AllAlerts.Acknowledged = '1'
THEN ISNULL(History.CreatedBy,
'')
WHEN AllAlerts.Acknowledged = '0'
THEN ' '
END ,
AllAlerts.AssignedTo AS AssignedTo ,
DATEADD(HOUR, DATEDIFF(HH, GETUTCDATE(), GETDATE()),
AllAlerts.ReportedTime) AS CreatedTime ,
DATEADD(HOUR, DATEDIFF(HH, GETUTCDATE(), GETDATE()),
AllAlerts.ClearedTime) AS ClearedTime ,
"Severity" = CASE WHEN AllAlerts.Severity = '4'
THEN 'Down'
WHEN AllAlerts.Severity = '3'
THEN 'Critical'
WHEN AllAlerts.Severity = '2'
THEN 'Major'
WHEN AllAlerts.Severity = '1'
THEN 'Minor'
END ,
AllAlerts.SvcDeskTicket AS TicketID ,
ISNULL(STUFF(( SELECT CAST('# ' AS VARCHAR(MAX))
+ Notes.AnnotationText + '['
+ Notes.CreatedBy + ', '
+ CAST(Notes.CreatedTime AS VARCHAR(MAX))
+ ']'
FROM #Notes AS Notes
WHERE Notes.AlertID = AllAlerts.AlertID
FOR
XML PATH('')
), 1, 1, ''), '') AS Notes
FROM [ISG_SOI ].[dbo].[Alerts] AS AllAlerts
INNER JOIN [ISG_SOI ].[dbo].[AlertQueueAssignments]
AS QA
ON QA.[AlertID] = AllAlerts.[AlertID]
INNER JOIN [ISG_SOI ].[dbo].[AlertQueues] AS Queues
ON Queues.[QueueID] = QA.[QueueID]
LEFT JOIN #History AS History
ON History.AlertID = AllAlerts.AlertID
答案 1 :(得分：0)
--try this, variant using CTE
--remove calculation from subquery to cte table
--------------------------------------------------------------------------------
;
WITH History
AS ( SELECT History.AlertID ,
MAX(History.CreatedBy) AS CreatedBy
FROM [ISG_SOI ].[dbo].[AlertHistory] AS History
INNER JOIN [ISG_SOI ].[dbo].[Alerts]
AS AllAlerts
ON History.AlertID = AllAlerts.AlertID
WHERE History.ColumnName = '73549'
AND History.Currentvalue = 'true'
GROUP BY History.AlertID
),
-------------------------------------------------------------------------------------
--XML agregation also is too expensive, reduce time thro removing not required data--
-------------------------------------------------------------------------------------
--1.
[Services]
AS ( SELECT DISTINCT
Relationship.BNodeCIID ,
[Services].Label
FROM [ISG_SOI ].[dbo].[SecureServiceCI]
AS [Services]
INNER JOIN [ISG_SOI ].[dbo].[CIRelationship]
AS Relationship
ON [Services].CIID = Relationship.ServiceCIID
INNER JOIN [ISG_SOI ].[dbo].[Alerts]
AS AllAlerts
ON Relationship.BNodeCIID = AllAlerts.CIID
),
--2.
Notes
AS ( SELECT Notes.AlertID ,
Notes.AnnotationText ,
Notes.CreatedBy ,
Notes.CreatedTime
FROM [ISG_SOI ].[dbo].[AlertAnnotation]
AS Notes
INNER JOIN [ISG_SOI ].[dbo].[Alerts]
AS AllAlerts
ON Notes.AlertID = AllAlerts.AlertID
)
--------------------------------------------------------------------------------
SELECT AllAlerts.AlertID AS AlertID ,
Queues.QueueID AS QueueID ,
Queues.QueueName AS QueueName ,
AllAlerts.ConnectorID AS ConnectorID ,
CAST(ISNULL(STUFF(( SELECT CAST(',' AS VARCHAR(MAX))
+ [Services].Label
FROM [Services]
WHERE [Services].BNodeCIID = AllAlerts.CIID
FOR
XML PATH('')
), 1, 1, ''), '') AS CHAR(1000)) AS OwnedServices ,
SUBSTRING(AllAlerts.DeviceID,
ISNULL(2 + LEN(AllAlerts.DeviceID)
- NULLIF(CHARINDEX(',',
REVERSE(AllAlerts.DeviceID)),
0), 0),
CASE CHARINDEX(':', AllAlerts.DeviceID)
WHEN 0 THEN LEN(AllAlerts.DeviceID) + 1
ELSE CHARINDEX(':', AllAlerts.DeviceID)
END - ISNULL(2 + LEN(AllAlerts.DeviceID)
- NULLIF(CHARINDEX(',',
REVERSE(AllAlerts.DeviceID)),
0), 0)) AS CIName ,
AllAlerts.DeviceID AS DeviceID ,
AllAlerts.SituationMessage AS Summary ,
AllAlerts.AlertDetail AS Detail ,
AllAlerts.Acknowledged AS Acknowledged ,
AllAlerts.UserAttribute5 AS Occurrences ,
"AcknowledgedBy" = CASE WHEN AllAlerts.Acknowledged = '1'
THEN ISNULL(History.CreatedBy,
'')
WHEN AllAlerts.Acknowledged = '0'
THEN ' '
END ,
AllAlerts.AssignedTo AS AssignedTo ,
DATEADD(HOUR, DATEDIFF(HH, GETUTCDATE(), GETDATE()),
AllAlerts.ReportedTime) AS CreatedTime ,
DATEADD(HOUR, DATEDIFF(HH, GETUTCDATE(), GETDATE()),
AllAlerts.ClearedTime) AS ClearedTime ,
"Severity" = CASE WHEN AllAlerts.Severity = '4'
THEN 'Down'
WHEN AllAlerts.Severity = '3'
THEN 'Critical'
WHEN AllAlerts.Severity = '2'
THEN 'Major'
WHEN AllAlerts.Severity = '1'
THEN 'Minor'
END ,
AllAlerts.SvcDeskTicket AS TicketID ,
ISNULL(STUFF(( SELECT CAST('# ' AS VARCHAR(MAX))
+ Notes.AnnotationText + '['
+ Notes.CreatedBy + ', '
+ CAST(Notes.CreatedTime AS VARCHAR(MAX))
+ ']'
FROM Notes
WHERE Notes.AlertID = AllAlerts.AlertID
FOR
XML PATH('')
), 1, 1, ''), '') AS Notes
FROM [ISG_SOI ].[dbo].[Alerts] AS AllAlerts
INNER JOIN [ISG_SOI ].[dbo].[AlertQueueAssignments]
AS QA
ON QA.[AlertID] = AllAlerts.[AlertID]
INNER JOIN [ISG_SOI ].[dbo].[AlertQueues] AS Queues
ON Queues.[QueueID] = QA.[QueueID]
LEFT JOIN History
ON History.AlertID = AllAlerts.AlertID
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