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Posts Tagged ‘Indexes’

Create Indexes from the Missing Indexes DMV

24 May

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_’

            + 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)

                  IndexName

FROM I

 
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