Finding Unused Indexes

SQLWayne has a script to help find unused indexes:

Here’s some code that can show you what indexes are unused or empty.  An empty index just means that there’s no data in that table right now, it may always be populated later, so I would not drop an empty index.  Besides, how much space would an empty index take?

For my personal preferences, I order the output by table then index name, also I put a u.* at the end of the select statement so the more interesting usage stat columns can be seen.

If an index truly is unused, it’s a waste of resources.  The problem is, sometimes you’ll think an index is unused but it’s really a vital part of month-end reporting or used for the CEO’s favorite dashboard.

Related Posts

Query Store Indexes

Arthur Daniels shows what you can learn from the indexes on Query Store tables: It looks like internally Query Store is referred to as plan_persist. That makes sense, thinking about how the Query Store persists query plans to your database’s storage. Let’s take a look at those catalog views vs their clustered and nonclustered indexes. […]

Read More

Gotchas When Indexing Partitioned Tables

Andrew Pruski gives us a couple of considerations when creating indexes on partitioned tables in SQL Server: Looking at that data page, we can see that SQL has added a UNIQUIFIER column. Now this is standard SQL behaviour, SQL does this to all non-unique clustered indexes whether they are on a partitioned table or not. But also […]

Read More


May 2016
« Apr Jun »