Heim >Datenbank >MySQL-Tutorial >SQLServer资源调控器

SQLServer资源调控器

WBOY
WBOYOriginal
2016-06-07 15:27:081229Durchsuche

很早之前就有朋友问过我,能否按业务的优先等级分配SQLServer的资源,使得不同的应用能得到不同的响应,SQLServer2008之前对这个需求貌似没有什么 解决方法,不过从SQLServer2008开始,这个需求就变得很简单了,SQLServer直接就为我们提供了按用户的要求分配

     很早之前就有朋友问过我,能否按业务的优先等级分配SQLServer的资源,使得不同的应用能得到不同的响应,SQLServer2008之前对这个需求貌似没有什么

解决方法,不过从SQLServer2008开始,这个需求就变得很简单了,SQLServer直接就为我们提供了按用户的要求分配资源的能力,下面我们就来介绍这个功能。

 

    SQLServer资源调控器分成三个部分:资源池、负载组和分类器函数;资源池为我们提供了将资源(CPU、Memory等)划分到不同的载体中,负载组承载负载并

将这些负载映射到资源池,分类器函数将不同的会话映射到不同的负载组中。

 

资源池:

 08提供了两种预先定义好的资源池

 内部池:内部池只用于SQLServer数据库引擎,系统管理员不能改变和设置;

 默认池:默认池用于没有分配资源池的各种负载,因此,如果你不指定资源调控器,全部负载将使用默认池。默认池也不能改变或删除,但是可以修改它的资源上

            下限。

 资源池上下限要求:

    各个资源池的下限之和不能超过100%,因为SQLServer会尽力满足每个下限;

    上限可以设置为下限和100%之间的任意值。


以下是关于资源池的基本操作:

<span>--</span><span>创建资源池<br> </span><span>Create</span> Resource Pool UserQueries <span>with</span>(max_cpu_percent<span>=</span><span>100</span><span>)

</span><span>--</span><span>删除资源池<br></span><span>drop</span> Resource Pool UserQueries

 

负载组:

     负载组可以让管理员轻松地监控资源使用情况,在不同的资源池之间移动某类负载。

     负载组被映射到资源池上,一个资源池可以有零个或更多负载组,一个负载组为一组用户会话提供一个桶。

<span>--</span><span>创建负载组</span>
<span>Create</span> WorkLoad <span>Group</span><span> DailyExecReports USING UserQueries;

</span><span>--</span><span>删除负载组</span>
<span>drop</span> WorkLoad <span>Group</span> DailyExecReports

 

分类器函数:

     分类器函数将接入的会话分类,并为会话的请求和查询分配一个负载组。你可以根据连接串中的任意属性(IP地址/应用程序名、用户名等)分别分配组。

按以下条件分配组:

  •   一个用户接入并使用SAP_Login登录名,则为他分配SAPUsers负载组;
  •   一个用户接入程序名是SSMS,则让它成为AdhocAdmin负载组的一员;
  •   一个用户是ReportUsers组一员,则让它成为DaliyExecReports负载组一员;
  •   一个用户以共享内存连接,并在NightlyAdmin用户组中,则分配NightlyMaintanceTask组。

<span>--</span><span>创建资源池</span>
<span>Create</span> Resource Pool AdminQueries <span>with</span>(max_cpu_percent<span>=</span><span>100</span><span>)
</span><span>Create</span> Resource Pool UserQueries <span>with</span>(max_cpu_percent<span>=</span><span>100</span><span>)

</span><span>--</span><span>创建负载组</span>
<span>Create</span> WorkLoad <span>Group</span><span> NightlyMaintenanceTasks USING AdminQueries;
</span><span>Create</span> WorkLoad <span>Group</span><span> AdhocAdmin USING AdminQueries;
</span><span>Create</span> WorkLoad <span>Group</span><span> SAPUsers USING UserQueries;
</span><span>Create</span> WorkLoad <span>Group</span><span> DailyExecReports USING UserQueries;

</span><span>--</span><span>创建分类器函数</span>
    <span>USE</span><span> master
    </span><span>GO</span>
    <span>create</span> <span>FUNCTION</span><span> class_func_1()
    </span><span>Returns</span> sysname <span>with</span><span> schemabinding
    </span><span>begin</span>
      <span>Declare</span> <span>@val</span><span> sysname
      </span><span>--</span><span>Handle workload groups defined by login names</span>
      <span>IF</span> <span>SUSER_SNAME</span>()<span>=</span><span>'</span><span>SAP_Login</span><span>'</span>
        <span>begin</span>
          <span>SET</span> <span>@val</span><span>=</span><span>'</span><span>SAPUsers</span><span>'</span><span>;
          </span><span>Return</span> <span>@val</span><span>;
        </span><span>end</span>
        
      <span>IF</span> <span>APP_NAME</span>() <span>like</span> <span>'</span><span>Microsoft SQL Server Management Studio%</span><span>'</span>
        <span>begin</span>
          <span>Set</span> <span>@val</span><span>=</span><span>'</span><span>AdhocAdmin</span><span>'</span><span>;
          </span><span>Return</span> <span>@val</span><span>;
        </span><span>end</span>
      
      <span>IF</span> <span>IS_MEMBER</span>(<span>'</span><span>ReportUsers</span><span>'</span>)<span>=</span><span>1</span>
        <span>begin</span>
          <span>Set</span> <span>@val</span><span>=</span><span>'</span><span>DailyExecReports</span><span>'</span><span>;
          </span><span>Return</span> <span>@val</span><span>;
        </span><span>end</span>
        
      <span>IF</span> CONNECTIONPROPERTY(<span>'</span><span>net_transport</span><span>'</span>)<span>=</span><span>'</span><span>Shared memory</span><span>'</span> <span>and</span> <span>IS_MEMBER</span>(<span>'</span><span>NightlyAdmin</span><span>'</span>)<span>=</span><span>1</span>
        <span>begin</span>
          <span>Set</span> <span>@val</span><span>=</span><span>'</span><span>NightlyMaintenanceTasks</span><span>'</span><span>;
          </span><span>Return</span> <span>@val</span><span>;
        </span><span>end</span>
        
      <span>Return</span> <span>@val</span><span>;
    </span><span>end</span>

绑定分类器函数:

<span>--</span><span>将分类器函数绑定到资源调控器上</span>
  <span>Alter</span> Resource Governor <span>With</span>(Classifier_Function<span>=</span>dbo.class_func_1);

启用和禁用分类器函数:

<span>--</span><span>启用</span>
 <span>ALter</span> Resource Governor <span>Reconfigure</span><span>;
</span><span>--</span><span>禁用</span>
 <span>ALTER</span> RESOURCE GOVERNOR DISABLE;

 

测试:

现在我们分别使用SAP_Login和sysadmin用户调用此脚本

<span>--</span><span>测试脚本(分别使用SAP_Login和sysadmin用户调用此脚本)</span>
  <span>set</span> nocount <span>on</span> 
  <span>Declare</span> <span>@i</span> <span>int</span><span>=</span><span>100000000</span><span>;
  </span><span>Declare</span> <span>@s</span> <span>varchar</span>(<span>100</span>),<span>@count</span> <span>int</span><span>;
   </span><span>While</span> <span>@i</span><span>></span><span>0</span>
   <span>begin</span>
    <span>Select</span> <span>@s</span><span>=</span><span>@@VERSION</span><span>;
    </span><span>select</span> <span>@count</span><span>=</span><span>COUNT</span>(<span>0</span>) <span>from</span><span> sys.sysobjects 
    </span><span>set</span> <span>@i</span><span>=</span><span>@i</span><span>-</span><span>1</span><span>;
   </span><span>end</span>

 

通过性能计数器查看资源分配:

 我们可以选择性能计数器的资源统计:SQL Server:Resource Pools Stats;

SQLServer资源调控器

 我们先将资源池按一比一的比例分配:

<span>Create</span> Resource Pool AdminQueries <span>with</span>(max_cpu_percent<span>=</span><span>100</span><span>)
</span><span>Create</span> Resource Pool UserQueries <span>with</span>(max_cpu_percent<span>=</span><span>100</span>)

 运行测试脚本,显示的CPU利用率图如下

SQLServer资源调控器

 现在将资源分配做如下调整:

<span>Create</span> Resource Pool AdminQueries <span>with</span>(max_cpu_percent<span>=</span><span>10</span><span>)
</span><span>Create</span> Resource Pool UserQueries <span>with</span>(max_cpu_percent<span>=</span><span>90</span>)

 再次运行测试脚本,显示的CPU利用率图如下

SQLServer资源调控器

可以看到,当我们调整资源后,两个Session中运行同样的脚本,它们所使用的资源差别很大,这样就达到了根据不同的应用分配不同的资源的目的。

 

DMV查看资源池:

<span>--</span><span>查看Session所在的资源池</span>
    <span>select</span><span> s.session_id,s.login_name ,s.program_name,s.group_id,g.name 
    </span><span>from</span><span> 
    sys.dm_exec_sessions s </span><span>join</span><span> sys.dm_resource_governor_workload_groups g
    </span><span>on</span> s.group_id<span>=</span><span>g.group_id
    </span><span>where</span> session_id<span>></span><span>50</span>

<span>--</span><span>查看资源池情况</span>
    <span>select</span> <span>*</span> <span>from</span> sys.dm_resource_governor_resource_pools

SQLServer资源调控器

可以看到,我们创建的两个资源池(还有两个是系统资源池和默认资源池),而且不同的Session对应到了不同的资源池中。

 

 

Stellungnahme:
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn