Create Indexes from the Missing Indexes DMV

Seth Phelabaum — Mon, 24 May 2010 15:43:01 +0000

Glenn Berry (Blog) writes a lot of queries to extract information from the system DMV’s. One of them in particular I found extremely helpful in fixing some of the issues in my system. I took his query (the CTE at the top) and added some text manipulation to actually generate the create statements for you to save you some time. I had much grander plans for this, but unfortunately I’ve been meaning to post this for over a month now and simply haven’t had time to get back to it, so rather than just let it go by the wayside and never post it, I figured I’d just post what I had now and then possibly post an update sometime in the future if I ever finish it.

A couple of the known problems right now are:

Index names could already be taken, there’s nothing here that checks to make sure they are unique based on other indexes in your database.
No compression options are taken into account.

That said, I still found this fairly useful and hopefully somebody else will as well. Thanks again to Glenn for all his excellent work at creating queries to pull information from the DMV’s.

;WITH I AS (

– Missing Indexes current database by Index Advantage

– This DMV Query written by Glenn Berry

SELECT user_seeks * avg_total_user_cost *

(avg_user_impact * 0.01) AS [index_advantage],

migs.last_user_seek,

mid.[statement] AS [Database.Schema.Table],

mid.equality_columns, mid.inequality_columns,

mid.included_columns,migs.unique_compiles, migs.user_seeks,

migs.avg_total_user_cost, migs.avg_user_impact

FROM sys.dm_db_missing_index_group_stats AS migs WITH (NOLOCK)

INNER JOIN sys.dm_db_missing_index_groups AS mig WITH (NOLOCK)

ON migs.group_handle = mig.index_group_handle

INNER JOIN sys.dm_db_missing_index_details AS mid WITH (NOLOCK)

ON mig.index_handle = mid.index_handle

WHERE mid.database_id = DB_ID()

AND user_seeks * avg_total_user_cost *

(avg_user_impact * 0.01) > 9000 – Set this to Whatever

)

SELECT ‘CREATE INDEX IX_’

+ SUBSTRING([Database.Schema.Table],

CHARINDEX(‘].[',[Database.Schema.Table],

CHARINDEX(‘].[',[Database.Schema.Table])+4)+3,

LEN([Database.Schema.Table]) -

(CHARINDEX(‘].[',[Database.Schema.Table],

CHARINDEX(‘].[',[Database.Schema.Table])+4)+3))

+ ‘_’ + LEFT(REPLACE(REPLACE(REPLACE(REPLACE(

ISNULL(Equality_Columns,inequality_columns),

‘[',''),']‘,”),‘ ‘,”),‘,’,”),20)

+ ‘ ON ‘

+ [Database.Schema.Table]

+ ‘(‘

+ ISNULL(equality_columns,”)

+ CASE WHEN equality_columns IS NOT NULL AND

inequality_columns IS NOT NULL

THEN ‘,’

ELSE ”

END

+ ISNULL(inequality_columns,”)

+ ‘)’

+ CASE WHEN included_columns IS NOT NULL

THEN ‘ INCLUDE(‘ + included_columns + ‘)’

ELSE ”

END CreateStatement,

‘IX_’