Script para conocer indices perdidos en SQL SERVER TUNNING

INDICES PERDIDOS

El siguiente qry da como resultado los indices que están perdidos o hacen falta a determinada base de datos, te tienes que posicionar en la base de datos a la que deseas ver los indices faltantes, generas una nueva consulta, pegas la consulta y ejecutas, te dara una lista de los indices que faltan y la sentencia para crearlos.

SELECT

  mig.index_group_handle, mid.index_handle,

  CONVERT (DECIMAL (28,1),

    migs.avg_total_user_cost * migs.avg_user_impact * (migs.user_seeks + migs.user_scans)

  ) AS improvement_measure,

  'CREATE INDEX IDX_' + REPLACE(REPLACE(mid.statement, '[', ''), ']', '')+ CONVERT (VARCHAR, mig.index_group_handle) + '_' + CONVERT (VARCHAR, mid.index_handle)

  + ' ON ' + mid.statement

  + ' (' + ISNULL (mid.equality_columns,'')

    + CASE WHEN mid.equality_columns IS NOT NULL AND mid.inequality_columns IS NOT NULL THEN ',' ELSE '' END

    + ISNULL (mid.inequality_columns, '')

  + ')'

  + ISNULL (' INCLUDE (' + mid.included_columns + ')', '') AS create_index_statement,

  migs.*, mid.database_id, mid.[object_id]

FROM sys.dm_db_missing_index_groups mig

INNER JOIN sys.dm_db_missing_index_group_stats migs ON migs.group_handle = mig.index_group_handle

INNER JOIN sys.dm_db_missing_index_details mid ON mig.index_handle = mid.index_handle

WHERE CONVERT (DECIMAL (28,1), migs.avg_total_user_cost * migs.avg_user_impact * (migs.user_seeks + migs.user_scans)) > 10

ORDER BY migs.avg_total_user_cost * migs.avg_user_impact * (migs.user_seeks + migs.user_scans) DESC

INDICES NO OCUPADOS

DECLARE @db VARCHAR(25)

SET @db = 'congadb'

SELECT object_name(i.object_id), i.name

FROM sys.indexes i, sys.objects o

WHERE  i.index_id NOT IN (SELECT s.index_id

       FROM sys.dm_db_index_usage_stats s

    WHERE s.object_id=i.object_id AND

    i.index_id=s.index_id AND

  database_id = db_id(@db) )

AND o.TYPE = 'U'

AND o.object_id = i.object_id

ORDER BY object_name(i.object_id) ASC