Documentation for dm_db_missing_index_group_stats_query

No, It’s New

When I was checking out early builds of SQL Server 2019, I noticed a new DMV called dm_db_missing_index_group_stats_query, that I thought was pretty cool.

It helped you tie missing index requests to the queries that requested them. Previously, that took a whole lot of heroic effort, or luck.

With this new DMV, it’s possible to combine queries that look for missing indexes with queries that look for tuning opportunities in the plan cache or in Query Store.

It seems to tie back to dm_db_missing_index_groups, on the index_group_handle column in this DMV joined to the group handle column in the new DMV.

If you’re wondering why I’m not giving you any code samples here, it’s because I’m going to get some stuff built into sp_BlitzIndex to take advantage of it, now that it’s documented.

Special thanks to William Assaf (b|t) for helping to get this done.

Thanks for reading!

Going Further

If this is the kind of SQL Server stuff you love learning about, you’ll love my training. I’m offering a 75% discount to my blog readers if you click from here. I’m also available for consulting if you just don’t have time for that and need to solve performance problems quickly.

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