Я написал ниже запрос для извлечения отдельного RegNo из двух разных таблиц. Но ниже запроса требуется около 25 секунд для получения результатов. В таблице инвентаря имеется более 1,5 миллиона записей.Как сократить время выполнения запроса на SQL-сервере?
Select F.PKID, F.RegNo
From
(
Select E.PKID, E.RegNo
Row_Number() Over(Order By E.RegNo Asc) RowNo
From
(
Select C.PKID, C.RegNo
From
(
Select Pk_Id PKID, LTrim(RTrim(A.Reg_No)) RegNo,
Row_Number() Over(Partition By LTrim(RTrim(A.Reg_No))
Order By (Select Null)) RegRowNo
From dbo.KeyreferenceDetails A (NoLock)
Where A.KeyreferenceStatus = 'L'
And A.Reg_No Like @Value And IsNull(Reg_No, '') <> '' And Not Exists
(
Select 1 From dbo.INVENTORY B (NoLock)
Where A.Reg_No = B.Inv_H_Reg_No
)
) C
Where C.RegRowNo = 1 And IsNull(C.RegNo, '') <> '-'
Union
Select D.PKID, D.RegNo
From
(
Select Pk_ID PKID, LTrim(LTrim(Txt_RegNo)) RegNo,
Row_Number() Over(Partition By LTrim(LTrim(A.Txt_RegNo))
Order By (Select Null)) RegRowNo
From dbo.MobileMessageDetails A (Nolock)
Left Join dbo.PLACE P (Nolock) On P.Place_Shrt_Code = A.Txt_YarddCode
And P.[Status] = 'L'
Left Join dbo.INVENTORY B (Nolock) On A.Txt_RegNo = B.Inv_H_Reg_No
Where A.Txt_INOUT In('IN', 'MOBILE') And IsNull(A.Txt_RegNo, '') <> '' And B.Inv_H_Pk_Id Is Null
And A.[Status] = 'L' And Txt_RegNo Like @Value
) D
Where D.RegRowNo = 1 And IsNull(D.RegNo, '') <> '-'
) E
) F
Where F.RowNo > 0 And F.RowNo <= 20
План запроса:
Доступные индексы:
KeyreferenceDetails table:
Index Name ---------------+ Column Name ----------------- + Index Type
IX_KeyreferenceDetails_I | Reg_No | NONCLUSTERED
IX_KeyreferenceDetails_II | KeyreferenceStatus | NONCLUSTERED
Inventory table:
Index Name ---------------+ Column Name ----------------- + Index Type
IX_Inventory_I | Inv_H_Reg_No | NONCLUSTERED
MobileMessageDetails table:
Index Name --------------- + Column Name ----------------- + Index Type
IX_MobileMessageDetails_I | Txt_RegNo | NONCLUSTERED
IX_MobileMessageDetails_II | Txt_INOUT | NONCLUSTERED
Place table:
Index Name ---------------+ Column Name ----------------- + Index Type
IX_Place_I | Place_Shrt_Code | NONCLUSTERED
IX_Place_I | Status | NONCLUSTERED
Я создал требуемые индексы для всех используемых таблиц в приведенном выше запросе. Но стоимость запросов высока. Как сократить время выполнения запросов на SQL-сервере?
Statistics Output:
SQL Server Execution Times:
CPU time = 0 ms, elapsed time = 0 ms.
Table 'INVENTORY'. Scan count 6, logical reads 382, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'KeyreferenceDetails'. Scan count 15, logical reads 9062, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Mobile_MessageDetails'. Scan count 1, logical reads 4, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table '#TempItemsCount_____________________________________________________________________________________________________0000000118A9'. Scan count 0, logical reads 1, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
SQL Server Execution Times:
CPU time = 20733 ms, elapsed time = 7844 ms.
Table 'INVENTORY'. Scan count 6, logical reads 382, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'KeyreferenceDetails'. Scan count 14, logical reads 9062, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Mobile_MessageDetails'. Scan count 1, logical reads 4, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table '#VehicleRegDetails__________________________________________________________________________________________________0000000118AB'. Scan count 0, logical reads 20, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
SQL Server Execution Times:
CPU time = 21139 ms, elapsed time = 8146 ms.
Table '#TABLE_SCHEMA_______________________________________________________________________________________________________0000000118AA'. Scan count 0, logical reads 1, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Update:
Insert Into #TempItemsCount(TotalCount)
Select Count(E.PKID)
From
(
Select E.PKID, E.RegNo
Row_Number() Over(Order By E.RegNo Asc) RowNo
From
(
Select C.PKID, C.RegNo
From
(
Select Pk_Id PKID, LTrim(RTrim(A.Reg_No)) RegNo,
Row_Number() Over(Partition By LTrim(RTrim(A.Reg_No))
Order By (Select Null)) RegRowNo
From dbo.KeyreferenceDetails A (NoLock)
Where A.KeyreferenceStatus = 'L'
And A.Reg_No Like @Value And IsNull(Reg_No, '') <> '' And Not Exists
(
Select 1 From dbo.INVENTORY B (NoLock)
Where A.Reg_No = B.Inv_H_Reg_No
)
) C
Where C.RegRowNo = 1 And IsNull(C.RegNo, '') <> '-'
Union
Select D.PKID, D.RegNo
From
(
Select Pk_ID PKID, LTrim(LTrim(Txt_RegNo)) RegNo,
Row_Number() Over(Partition By LTrim(LTrim(A.Txt_RegNo))
Order By (Select Null)) RegRowNo
From dbo.MobileMessageDetails A (Nolock)
Left Join dbo.PLACE P (Nolock) On P.Place_Shrt_Code = A.Txt_YarddCode
And P.[Status] = 'L'
Left Join dbo.INVENTORY B (Nolock) On A.Txt_RegNo = B.Inv_H_Reg_No
Where A.Txt_INOUT In('IN', 'MOBILE') And IsNull(A.Txt_RegNo, '') <> '' And B.Inv_H_Pk_Id Is Null
And A.[Status] = 'L' And Txt_RegNo Like @Value
) D
Where D.RegRowNo = 1 And IsNull(D.RegNo, '') <> '-'
) E
)
каковы результаты sys.dm_db_missing_index_details? –
Измените CTE на временные таблицы. (обратите внимание, а не на переменные таблицы) –
У вас, похоже, есть индексы для полей, заданных в качестве критериев поиска, таких как 'status' и' TXT_inout', но они не используются. Действительно ли это не ограничивает объем данных? Также может оказаться полезной и статистика io. –