FIX: An update enables you to exclude system databases from Query Statistics collection sets when you use the management data warehouse in SQL Server

Assume that you use the management data warehouse feature in SQL Server. By default, system databases are included in Query Statistics collection sets. In this situation, you may exhaust the disk space in a high-throughput environment. Specifically, the following two tables that store the query text and plan may grow very large:

• snapshots.notable_query_text
• snapshots.notable_query_plan

After you apply this update, the IncludeSystemDatabases setting is available in the following configuration parameter for a Query Statistics data collection item. You can configure IncludeSystemDatabases to decide whether system databases are included.

<ns:QueryActivityCollector xmlns:ns="DataCollectorType">
<Databases IncludeSystemDatabases="True" />
</ns:QueryActivityCollector> 

Note By default, the value of IncludeSystemDatabases is set to True.

For example, you can run the following Transact-SQL scripts to exclude system databases:

USE MSDB
GO
 
DECLARE @collection_item_name NVARCHAR(128);
DECLARE @parameters xml;
DECLARE @collection_set_uid uniqueidentifier;
DECLARE @collection_set_id int;
 
DECLARE @collection_item_id int;
 
SET @collection_set_uid = N'2DC02BD6-E230-4C05-8516-4E8C0EF21F95';
 
SET @collection_item_name = 'Query Statistics - Query Activity';
 
SELECT @collection_set_id = collection_set_id
FROM syscollector_collection_sets 
WHERE collection_set_uid = @collection_set_uid;
 
 
SET @collection_item_id = NULL;
SELECT @collection_item_id = collection_item_id
FROM syscollector_collection_items_internal 
WHERE collection_set_id = @collection_set_id 
    AND (name = @collection_item_name OR name = @collection_item_name);
 
 
SELECT @parameters = convert(xml, N'<ns:QueryActivityCollector xmlns:ns="DataCollectorType">
<Databases IncludeSystemDatabases="false" />
</ns:QueryActivityCollector>');
 
 
EXEC dbo.sp_syscollector_update_collection_item 
        @collection_item_id = @collection_item_id, 
        @parameters = @parameters;