sp_Blitz Result: Partitioned Tables with Non-Aligned Indexes

Table partitioning is a complex way to break out your large tables into smaller, more manageable chunks, but it comes with a lot of management heartache.  One of the challenges is making sure that your indexes are partitioned and aligned the same way as your clustered index.  We’ve written a lot about the pros and cons of table partitioning.

This part of our SQL Server sp_Blitz script checks the DMVs sys.objects, sys.indexes, and sys.data_spaces to see if they line up and have the same number of partitions.  It only checks at the database level – to see the individual objects having the problem, run this diagnostic query – and thanks to Alin Selicean for improving this query!

SELECT
ISNULL(db_name(s.database_id),db_name()) AS DBName
,OBJECT_SCHEMA_NAME(i.object_id,DB_ID()) AS SchemaName
,o.name AS [Object_Name]
,i.name AS Index_name
,i.Type_Desc AS Type_Desc
,DS.name AS DataSpaceName
,ds.type_desc AS DataSpaceTypeDesc
,s.user_seeks
,s.user_scans
,s.user_lookups
,s.user_updates
,s.last_user_seek
,s.last_user_update
FROM sys.objects AS o
JOIN sys.indexes AS i ON o.object_id = i.object_id
JOIN sys.data_spaces DS ON DS.data_space_id = i.data_space_id
LEFT OUTER JOIN sys.dm_db_index_usage_stats AS s ON i.object_id = s.object_id AND i.index_id = s.index_id AND s.database_id = DB_ID()
WHERE o.type = 'u'
AND i.type IN (1, 2)
AND o.object_id in
(
						        SELECT a.object_id from 
						          (SELECT ob.object_id, ds.type_desc from sys.objects ob JOIN sys.indexes ind on ind.object_id = ob.object_id join sys.data_spaces ds on ds.data_space_id = ind.data_space_id
						          GROUP BY ob.object_id, ds.type_desc ) a group by a.object_id having COUNT (*) > 1
						      )
ORDER BY [OBJECT_NAME] DESC

To Fix the Problem

Depending on the size of the data involved, this could be a pretty big problem that involves taking a maintenance window.  Time to hit the books – start reading our partitioning resources.

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