Policy for Ad-hoc Workloads
During my presentation at SQLSaturday 62 in Tampa I was asked by an attendee about having a policy to check the setting for ad-hoc optimization settings. At the time since I was in a bit of a time crunch (and I couldn’t remember the exact facet to look under) I couldn’t properly demo how to check for it. In this post I’ll show you how to check for that specific setting. In a future post I’ll show you how to check on many more settings.
Before we begin, I highly recommend you familiarize yourself with what exactly this setting changes and how it affects your SQL Server environment. Remember this setting affects the entire instance so all databases installed here will be affected by this change. Read this great post by Bob Pusateri (Blog | Twitter) to get an understanding of what Optimizing for Ad Hoc Workloads really does.
Creating the Policy/Condition
- In SQL Server Management Studio browse down to and expand your management node, expand the Policy-Based Management node, right-click the Policies folder and select New Policy.
- Name your new policy and then from the Check Conditions drop down menu select New Condition.
- Give your new condition a name and from the Facet drop down menu select the Server Configuration facet.
- In the Expression editor, click the area below the column title of field and you will be presented with a drop-down of all the properties available for this facet. Select @OptimizeAdhocWorkloads.
- Under the heading of Value, you will have two options: True or False. When you create a policy you want to establish a condition you want so for the purposes of this demonstration we want our servers to have this setting set to off (which is default setting) so we’ll select the option for FALSE. Click OK to create your condition and return to the new policy window.
- Next we’ll select our Evaluation Mode. This policy, based on the facets and properties we’ve selected offer us three options: On demand, on schedule and On Change: log only. The last option, if enabled, will allow this policy to be active and log any changes made to this particular setting. One cool thing you can do with this is you can create alerts to automatically email you if this particular condition is violated. Check out Ken Simmons (Blog | Twitter) article on Configuring Alerts for Policy-Based Management to learn more. Leave the Evaluation Mode to On Demand and click OK.
Now that we have our policy created simply right-click on it (located under your Policies folder) and select Evaluate to try it out!
GUI? We Don’t Need No Stinking GUI!
In this post I walked you through how to create this policy using the GUI but if you prefer to script this out, you can do that too! Here is the T-SQL script that you can run in lieu of walking through the SSMS screens, to create this particular policy:
[code lang="sql" wraplines="true"]
Declare @object_set_id int
EXEC msdb.dbo.sp_syspolicy_add_object_set @object_set_name=N'Ad-hoc Workload Check_ObjectSet', @facet=N'IServerConfigurationFacet', @object_set_id=@object_set_id OUTPUT
Declare @target_set_id int
EXEC msdb.dbo.sp_syspolicy_add_target_set @object_set_name=N'Ad-hoc Workload Check_ObjectSet', @type_skeleton=N'Server', @type=N'SERVER', @enabled=True, @target_set_id=@target_set_id OUTPUT
Declare @policy_id int
EXEC msdb.dbo.sp_syspolicy_add_policy @name=N'Ad-hoc Workload Check', @condition_name=N'adhoc optimization check', @policy_category=N'', @description=N'This policy checks the server setting to see if Optimize for Ad-Hoc Workload is enabled. The default setting is disabled.', @help_text=N'To learn more about this policy check out Jorge Segarra''s blog post on this', @help_link=N'http://sqlchicken.com/2011/01/policy-for-ad-hoc-workloads/', @schedule_uid=N'00000000-0000-0000-0000-000000000000', @execution_mode=0, @is_enabled=False, @policy_id=@policy_id OUTPUT, @root_condition_name=N'', @object_set=N'Ad-hoc Workload Check_ObjectSet'
Again, I can’t iterate enough NOT to blindly go changing settings on your servers without understanding the effects of your actions! Policy-Based Management is a very powerful and easy-to-use tool but be sure to use it wisely! In a later post I will show you how to modify even more server-level settings and let you customize policies to check exactly the settings you want audit.