SQL Server Governer 控制资源的使用

Posted 2021-02-16 雅槐

 

 

--- Create a resource pool for production processing 
--- and set limits. 
USE master; 
GO 
CREATE RESOURCE POOL pProductionProcessing 
WITH 
( 
     MAX_CPU_PERCENT = 100, 
     MIN_CPU_PERCENT = 50 
); 
GO 
--- Create a workload group for production processing 
--- and configure the relative importance. 
CREATE WORKLOAD GROUP gProductionProcessing 
WITH 
( 
     IMPORTANCE = MEDIUM 
)USING pProductionProcessing
--- Assign the workload group to the production processing 
--- resource pool. 
USING pProductionProcessing 
GO 
--- Create a resource pool for off-hours processing 
--- and set limits. 

CREATE RESOURCE POOL pOffHoursProcessing 
WITH 
( 
     MAX_CPU_PERCENT = 50, 
     MIN_CPU_PERCENT = 0 
); 
GO 
--- Create a workload group for off-hours processing 
--- and configure the relative importance. 
CREATE WORKLOAD GROUP gOffHoursProcessing 
WITH 
( 
     IMPORTANCE = LOW 
) 
--- Assign the workload group to the off-hours processing 
--- resource pool. 
USING pOffHoursProcessing; 
GO 

ALTER RESOURCE GOVERNOR RECONFIGURE; 
GO 

USE master; 
GO 
CREATE TABLE tblClassificationTimeTable 
( 
     strGroupName     sysname          not null, 
     tStartTime       time              not null, 
     tEndTime         time              not null 
); 
GO 
--- Add time values that the classifier will use to 
--- determine the workload group for a session. 
INSERT into tblClassificationTimeTable VALUES(‘gProductionProcessing‘, ‘6:35 AM‘, ‘6:15 PM‘); 
go

CREATE FUNCTION fnTimeClassifier() 
RETURNS sysname 
WITH SCHEMABINDING 
AS 
BEGIN 
/* We recommend running the classifier function code under
snapshot isolation level OR using NOLOCK hint to avoid blocking on
lookup table. In this example, we are using NOLOCK hint. */
     DECLARE @strGroup sysname 
     DECLARE @loginTime time 
     SET @loginTime = CONVERT(time,GETDATE()) 
     SELECT TOP 1 @strGroup = strGroupName 
          FROM dbo.tblClassificationTimeTable WITH(NOLOCK)
          WHERE tStartTime <= @loginTime and tEndTime >= @loginTime 
     IF(@strGroup is not null) 
     BEGIN 
          RETURN @strGroup 
     END 
--- Use the default workload group if there is no match 
--- on the lookup. 
     RETURN N‘gOffHoursProcessing‘ 
END; 
GO 

ALTER RESOURCE GOVERNOR with (CLASSIFIER_FUNCTION = dbo.fnTimeClassifier); 
ALTER RESOURCE GOVERNOR RECONFIGURE; 
GO