SQL Server - Identify Unused Tables & Indexes

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riteshmedhe Ritesh Medhe (Member since: 3/31/2011 11:34:25 AM)
Ritesh Medhe is a Microsoft Certified DBA & a BI professional with over 8 years of experience. Expertise: Performance optimization & SQL Server Administration

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Comments (8)

shannon lowder
1/10/2012 12:53:35 PM shannon lowder said:
I believe this query wouldn't be able to tell if your heaps are used or not, since they wouldn't have a clustered index in the sys.indexes table. I think that was the piece I was missing when I went searching for the same thing. Can you verify it reports correctly on tables without a clustered index?
1/10/2012 5:10:08 PM Kyle said:

Just add i.type_desc as one of the selected fields and it shows it works on heap and nonclusterd indexes. You'll need to test it to determine if its "reporting correctly". Tongue out

1/11/2012 1:05:12 PM Ritesh Medhe said:

Hi Shannon, The script does show unused heaps, Script would return <unused table> under column index name no matter whether the table is heap/have CI or NCI  

1/11/2012 1:05:59 PM Ritesh Medhe said:

Thanks Kyle 

1/11/2012 4:11:34 PM user622069  said:

Just one problem:  sys.dm_db_index_usage_stats is initialized to empty whenever the SQL Server service starts, whenever a database is detached or is shut down.  This means index utilization stats are only valid since the last time the SQL Server service was started.

Is is very possible to have indexes that support reports which are only run periodically (monthly, quarterly or annually).  These could be mistakenly dropped because they appear to be unused.

I agree completely that such objects can be dropped ONLY after consulting with the team members who support the application

Grant McAllister
1/11/2012 7:42:49 PM Grant McAllister said:

I have just been studying the DMV sys.dm_db_index_usage_statsused here this week for just this purpose as well as the DMV's for possible missing indexes.

I don't think you can really just use the existance or not of the index within the DMV as it may have been used for a system scan to update the statistics! I was looking to use the columns within the DMV to assess how much the index is used as a candidate for deletion could be used seldomly and infrequently (after ignoring the system accesses).

1/17/2012 12:00:07 AM Amit Bansal said:
Good reading; the post and comments
1/19/2012 2:24:43 AM A said:


How would you get all unused indexes in a single table instead of all databases?


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