sql SQL Server - 清除循环中的ErrorLogs表

Posted 2021-05-13

--kr153

SET NOCOUNT ON
DECLARE @BATCHCOUNT INT


---------------------------------------
/* BATCH COUNT - CHANGE AS NEEDED */
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SET @BATCHCOUNT = 1000                       
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DECLARE @ROWS INT
DECLARE @TOTAL BIGINT
DECLARE @REMAINING BIGINT
SET @ROWS = 1

-- 'month' keyword below can be changed to 'day' or 'year' if needed

--------------------------------------------------------------------------------------------
					/* QUERY - CHANGE AS NEEDED */
--------------------------------------------------------------------------------------------
/*  select all except last 1 month */   SELECT  @TOTAL = COUNT (*) FROM ERRORLOGS WITH(NOLOCK) WHERE ERRORTIME < DATEADD(month, -1, GETDATE());
--> SAMPLE FOR 2 months  --             SELECT  @TOTAL = COUNT (*) FROM ERRORLOGS WITH(NOLOCK) WHERE ERRORTIME < DATEADD(month, -2, GETDATE());
--> SAMPLE FOR 3 months  --             SELECT  @TOTAL = COUNT (*) FROM ERRORLOGS WITH(NOLOCK) WHERE ERRORTIME < DATEADD(month, -3, GETDATE());
--------------------------------------------------------------------------------------------

SET @REMAINING = @TOTAL

WHILE (@ROWS > 0)

BEGIN
	-----------------------------------------------------------------------------
						/* QUERY - CHANGE AS NEEDED */
	-----------------------------------------------------------------------------
	
	DELETE 
		TOP (@BATCHCOUNT) 
	FROM
		 ERRORLOGS       
	WHERE 
	/*  delete all except last 1 month */ ERRORTIME < DATEADD(month, -1, GETDATE())
	--> SAMPLE FOR 2 months  --  	      ERRORTIME < DATEADD(month, -2, GETDATE())
	--> SAMPLE FOR 3 months  --  	      ERRORTIME < DATEADD(month, -3, GETDATE())
		
    -----------------------------------------------------------------------------

    SET @ROWS = @@ROWCOUNT
	SET @REMAINING = @REMAINING - @ROWS
	PRINT 'Remaining '   +  CAST(@REMAINING AS VARCHAR) + '/' + CAST(@TOTAL AS VARCHAR) + ' Rows.' 

END