如何提高查詢性能，以更快速地刪除子表記錄

我有一個表Order，我想通過clientId刪除數據。該表格每個客戶端有超過2071458條記錄。而這個表有16個表的外鍵引用。當我嘗試刪除記錄時，需要2-4小時才能刪除記錄。那麼，如何提高性能來加快速度呢？如果是的話，我可以使用子查詢嗎？我可以在這個查詢中使用。以下是我正在使用的查詢。如何提高查詢性能，以更快速地刪除子表記錄

DECLARE @ORDERID int 
DECLARE DEL_RelDataOFOrdeTab CURSOR FOR 
SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID 
OPEN DEL_RelDataOFOrdeTab 

    FETCH NEXT FROM DEL_RelDataOFOrdeTab INTO @ORDERID 
    WHILE @@FETCH_STATUS = 0 

    BEGIN 
     DELETE FROM AUTHORIZED WHERE ORDERID = @ORDERID 
     DELETE FROM AUTODISPALERTS WHERE ORDERID = @ORDERID 
     DELETE FROM DRIVER_REIMBURSEMENT WHERE ORDERID = @ORDERID 
     DELETE FROM FAXPOD WHERE ORDERID = @ORDERID 
     DELETE FROM GENERICFIELDS WHERE ORDERID = @ORDERID 
     DELETE FROM [Messages] WHERE ORDERID = @ORDERID 
     DELETE FROM ORDAUDIT WHERE ORDERID = @ORDERID 
     DELETE FROM OrderNotification WHERE ORDERID = @ORDERID 
     DELETE FROM OrderNotificationActions WHERE ORDERID = @ORDERID 
     DELETE FROM ORDERSPAID WHERE ORDERID = @ORDERID 
     DELETE FROM ROUTESERVERORDERS WHERE ORDERID = @ORDERID 
     DELETE FROM UnfinalizedOrders WHERE ORDERID = @ORDERID 
     print 'DELETING FROM ORDE_' 
     DELETE FROM orde_ where ORDERID = @ORDERID 
     PRINT @ORDERID 
    FETCH NEXT FROM DEL_RelDataOFOrdeTab INTO @ORDERID 
    END 

CLOSE DEL_RelDataOFOrdeTab 
DEALLOCATE DEL_RelDataOFOrdeTab 

DELETE FROM orde_ WHERE CLIENTID = @ClientID

來源

2015-01-14 A.Goutam

永不使用光標WHERE條款。 –

@PareshJ所以我需要在這 –

您可以刪除CURSOR，只是使用SUBQUERY。

DELETE FROM AUTHORIZED WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM AUTODISPALERTS WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM DRIVER_REIMBURSEMENT WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM FAXPOD WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM GENERICFIELDS WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM [Messages] WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM ORDAUDIT WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM OrderNotification WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM OrderNotificationActions WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM ORDERSPAID WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM ROUTESERVERORDERS WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM UnfinalizedOrders WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID) 
DELETE FROM orde_ WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID)

基本上，它取代了

WHERE ORDERID = @ORDERID

到

WHERE ORDERID IN (SELECT ORDERID FROM orde_ WHERE CLIENTID = @ClientID)

來源

2015-01-14 07:50:36

使用我怎樣才能改變第二部分我的storeprocedure –

你可以應用相同的邏輯。 –

我嘗試一下，但在第二部分中感到困惑 –

如何提高查詢性能，以更快速地刪除子表記錄

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