Question

我有一个使用以下光标的存储过程：

DECLARE Delai_latence CURSOR LOCAL FOR 
SELECT [ID]
      ,[ID_LIVRAISON]
      ,[DH_ETAPE_DEB]
      ,[DH_ETAPE_FIN]
      ,[ORDRE_ETAPE]
FROM [ODS_PFNUM_DELAI]
WHERE ID_GRP = 1
  AND STATUT_ETAPE is not Null
  AND DH_ETAPE_FIN is not Null
ORDER BY [ID_LIVRAISON], [ORDRE_ETAPE]

为了优化它，我创建了非聚集索引：

CREATE NONCLUSTERED INDEX [IX_LATENCE_PFNUM_DELAI] ON [ODS_PFNUM_DELAI] 
(
    [ID_GRP] ASC,
    [STATUT_ETAPE] ASC,
    [DH_ETAPE_FIN] ASC
)
INCLUDE ( [ID],
[ID_LIVRAISON],
[DH_ETAPE_DEB],
[ORDRE_ETAPE]) WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]

然而，执行仍然花费太多时间（你会发现执行计划已附上）。

感谢。

ExecutionPlan.jpg

Answer 1

真正的问题可能是：你真的需要一个光标，特别是考虑到“胖子”这个问题。查询计划中显示的行。

无论如何，出于好奇，查询会从这个（过滤的）索引中受益吗？

CREATE INDEX idx_test ON [ODS_PFNUM_DELAI] 
       ([ID_GRP], [ID_LIVRAISON], [ORDRE_ETAPE]) 
INCLUDE ([ID], [DH_ETAPE_DEB], [DH_ETAPE_FIN])
WHERE [STATUT_ETAPE] IS NOT NULL AND [DH_ETAPE_FIN] IS NOT NULL

此外，没有关于存储过程的其余部分的线索：如果您碰巧正在更新游标循环内的[ODS_PFNUM_DELAI]表，并且更改不会影响实际的循环，将光标定义为STATIC。

可能是个好主意

如何优化游标使用的查询？

1 个答案: