我有一个查询,索引查找(非聚集)需要更多的时间,占总执行时间的93%。提高非聚集索引查询的性能
查询的执行计划,索引查找的估计行数为1,实际行数为209.这是否是问题?
如何提高非聚集索引seek的性能。一般的答案会有帮助。
执行计划:
而且下面是查询,
SELECT TOP 11 DVPR1.IncidentID, DVPR2.IncidentID, Rel.ID, PER1.[LastName], PER1.[FirstName]
FROM
DV_PHPersonalRecord DVPR1
INNER JOIN Relationship Rel
ON Rel.source_Id = DVPR1.RowId
AND Rel.typeCode = 'RPLC'
INNER JOIN DV_PHPersonalRecord DVPR2
ON DVPR2.RowId = Rel.target_Id
INNER JOIN [T_Attribute] (nolock)
ON [T_Attribute].[ActRelationship_ID] = Rel.[ID]
AND [T_Attribute].[name] = 'MergeFlag'
AND ([T_Attribute].[valueString_Code] = 'pending')
INNER JOIN [Person] PER1 (nolock)
ON DVPR1.[PersonDR]=PER1.[RowID]
INNER JOIN [Person] PER2 (nolock)
ON DVPR2.[PersonDR]=PER2.[RowID]
WHERE
DVPR1.TypeDR = 718990
AND
(PER1.[Code_ID] IS NULL OR (PER1.[Code_ID] = '6516'
AND PER1.[OptionsCode_ID] = '6522')
)
AND
(PER2.[Code_ID] IS NULL OR (PER2.[Code_ID] = '6516'
AND PER2.[OptionsCode_ID] = '6522')
)
ORDER BY PER1.[LastName] ASC,
PER1.[FirstName] ASC
查询需要多长时间?你为什么认为有问题? – Tomalak 2012-04-19 06:45:06
查询需要大约14秒...需求是应该在3秒内完成 – 2012-04-19 06:50:55
您可以发布执行计划和查询吗? – 2012-04-19 06:51:41