Indexing

  • Hi All,

    How to tell if the index is useful for my reads or it’s a burden for my DML operations?

    What is the optimal number of indexes that should be created on a table ? I know having too many indexes is like increasing the weight of the database.

    Best Regards,

    Bob

  • This was removed by the editor as SPAM

  • I used these 2 queries a while back to look for indexes that might not be needed. There may be better scripts these days.

    "Optimal" number of indexes = All the ones you need, and none of the ones you don't

    -- Combine 2 queries of Unused Indexes
    -- 1) stats exist, but never used
    select db.name AS DATABASENAME, obj.name as 'Table'
    , idx.name as 'Index', idx.rowcnt, idx.used/128 'MB', substring(ix.type_desc,1,20), 'Unused Stats', is_unique as 'unique', is_primary_key as 'primary'
    --,ixu.* ,idx.* ,obj.*
    from sys.dm_db_index_usage_stats ixu
    join sys.databases db on db.database_id = ixu.database_id
    join sys.objects obj on ixu.object_id = obj.object_id
    join sys.sysindexes idx on ixu.object_id = idx.id and ixu.index_id = idx.indid
    join sys.indexes ix on ixu.object_id = ix.object_id and ixu.index_id = ix.index_id
    where last_user_seek is null and last_user_scan is null and last_user_lookup is null
    and ixu.index_id > 0 and db.database_id = db_id() and obj.type <> 'S' -- and ix.type_desc = 'NONCLUSTERED'
    and ix.is_unique = 0 and ix.is_primary_key = 0 -- do not include unique or primary keys

    UNION
    -- 2) Stats were never created, so index is not used
    SELECT DB_NAME() AS DATABASENAME,
    --OBJECT_NAME(B.OBJECT_ID) AS 'Table',
    obj.name as 'Table',
    B.NAME AS 'Index',
    idx.rowcnt, idx.used/128 'MB', substring(b.type_desc,1,20), 'No Stats', is_unique as 'unique', is_primary_key as 'primary'
    FROM SYS.OBJECTS obj
    INNER JOIN SYS.INDEXES B ON obj.OBJECT_ID = B.OBJECT_ID
    join SYS.SYSINDEXES idx ON B.OBJECT_ID = idx.ID and B.index_id = idx.indid
    WHERE NOT EXISTS (SELECT *
    FROM SYS.DM_DB_INDEX_USAGE_STATS C
    WHERE B.OBJECT_ID = C.OBJECT_ID
    AND B.INDEX_ID = C.INDEX_ID)
    AND obj.TYPE <> 'S'
    and B.NAME is not NULL
    and b.is_unique = 0 and b.is_primary_key = 0 -- do not include unique or primary keys
    ORDER BY obj.name , idx.NAME

    • This reply was modified 1 month, 1 week ago by  homebrew01.
  • Look at the usage stats for the indexes to see if they are useful (and/or more useful than not).

    There's no single number of max indexes for a table.  It depends on the table and how it's queried.

    Here's a simplified version of the the script I use to analyze indexes.  It produces two result sets, both needed to analyze indexes.

    Indexes should be reviewed in toto, not piecemeal.  And the single most important thing is to get the best clustered index on every significant table.  Worry about nonclus indexes after that.

    /*capture changed system settings so that they can be reset at the end of this script*/
    DECLARE @deadlock_priority smallint
    DECLARE @transaction_isolation_level smallint
    SELECT @deadlock_priority = deadlock_priority, @transaction_isolation_level = transaction_isolation_level
    FROM sys.dm_exec_sessions
    WHERE session_id = @@SPID

    SET DEADLOCK_PRIORITY -8; /*"tell" SQL that if this task somehow gets into a deadlock, cancel THIS task, NOT any other one*/
    SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED

    --**********************************************************************************************************************

    SET NOCOUNT ON;

    DECLARE @filegroup_name nvarchar(128)
    DECLARE @include_system_tables bit
    DECLARE @list_filegroup_and_drive_summary bit
    DECLARE @list_missing_indexes bit
    DECLARE @list_missing_indexes_summary bit
    DECLARE @list_total_size bit
    DECLARE @max_compression int
    DECLARE @order_by smallint /* -2=size DESC; 1=table_name ASC; 2=size ASC; */
    DECLARE @table_name_pattern sysname
    DECLARE @table_name_exclude_pattern sysname = '#%'

    SET @list_missing_indexes = 1 --NOTE: can take some time, set to 0 if you don't want to wait.
    SET @list_missing_indexes_summary = 0 /*not available unless you uncomment the code for it which requires DelimitedSplit8K function*/
    SET @order_by = -2 /* -2=size DESC; 1=table_name ASC; 2=size ASC; */
    SET @list_total_size = 1
    SET @filegroup_name = '%'
    SET @table_name_pattern = '%'

    IF @include_system_tables IS NULL
    SET @include_system_tables = CASE WHEN DB_NAME() IN ('master', 'msdb', 'tempdb') THEN 1 ELSE 0 END
    SET @list_filegroup_and_drive_summary = 0

    DECLARE @debug smallint
    DECLARE @format_counts smallint --1=',0'; 2/3=with K=1000s,M=1000000s, with 0/1 dec. places;.
    DECLARE @include_schema_in_table_names bit
    DECLARE @sql_startup_date datetime
    DECLARE @total decimal(19, 3)

    SELECT @sql_startup_date = create_date
    FROM sys.databases WITH (NOLOCK)
    WHERE name = 'tempdb'

    SET @include_schema_in_table_names = 0
    SET @format_counts = 3
    SET @debug = 0

    IF OBJECT_ID('tempdb.dbo.#index_missing') IS NOT NULL
    DROP TABLE dbo.#index_missing
    IF OBJECT_ID('tempdb.dbo.#index_operational_stats') IS NOT NULL
    DROP TABLE dbo.#index_operational_stats
    IF OBJECT_ID('tempdb.dbo.#index_specs') IS NOT NULL
    DROP TABLE dbo.#index_specs
    IF OBJECT_ID('tempdb.dbo.#index_usage') IS NOT NULL
    DROP TABLE dbo.#index_usage

    SELECT *
    INTO #index_operational_stats
    FROM sys.dm_db_index_operational_stats ( DB_ID(), NULL, NULL, NULL )

    CREATE TABLE dbo.#index_specs (
    object_id int NOT NULL,
    index_id int NOT NULL,
    min_compression int NULL,
    max_compression int NULL,
    drive char(1) NULL,
    alloc_mb decimal(9, 1) NOT NULL,
    alloc_gb AS CAST(alloc_mb / 1024.0 AS decimal(9, 3)),
    used_mb decimal(9, 1) NOT NULL,
    used_gb AS CAST(used_mb / 1024.0 AS decimal(9, 3)),
    rows bigint NULL,
    table_mb decimal(9, 1) NULL,
    table_gb AS CAST(table_mb / 1024.0 AS decimal(9, 3)),
    size_rank int NULL,
    approx_max_data_width bigint NULL,
    max_days_active int,
    UNIQUE CLUSTERED ( object_id, index_id )
    ) --SELECT * FROM #index_specs

    --**********************************************************************************************************************

    PRINT 'Started @ ' + CONVERT(varchar(30), GETDATE(), 120)

    DECLARE @is_compression_available bit
    DECLARE @sql varchar(max)

    IF (CAST(SERVERPROPERTY('Edition') AS varchar(40)) NOT LIKE '%Developer%' AND
    CAST(SERVERPROPERTY('Edition') AS varchar(40)) NOT LIKE '%Enterprise%')
    AND (CAST(SERVERPROPERTY('ProductVersion') AS varchar(30)) NOT LIKE '1[456789]%.%')
    SET @is_compression_available = 0
    ELSE
    SET @is_compression_available = 1
    SET @sql = '
    INSERT INTO #index_specs ( object_id, index_id,' +
    CASE WHEN @is_compression_available = 0 THEN '' ELSE '
    min_compression, max_compression,' END + '
    alloc_mb, used_mb, rows )
    SELECT
    base_size.object_id,
    base_size.index_id, ' +
    CASE WHEN @is_compression_available = 0 THEN '' ELSE '
    base_size.min_compression,
    base_size.max_compression,' END + '
    (base_size.total_pages + ISNULL(internal_size.total_pages, 0)) / 128.0 AS alloc_mb,
    (base_size.used_pages + ISNULL(internal_size.used_pages, 0)) / 128.0 AS used_mb,
    base_size.row_count AS rows
    FROM (
    SELECT
    dps.object_id,
    dps.index_id, ' +
    CASE WHEN @is_compression_available = 0 THEN '' ELSE '
    MIN(p.data_compression) AS min_compression,
    MAX(p.data_compression) AS max_compression,' END + '
    SUM(dps.reserved_page_count) AS total_pages,
    SUM(dps.used_page_count) AS used_pages,
    SUM(CASE WHEN dps.index_id IN (0, 1) THEN dps.row_count ELSE 0 END) AS row_count
    FROM sys.dm_db_partition_stats dps ' +
    CASE WHEN @is_compression_available = 0 THEN '' ELSE '
    INNER JOIN sys.partitions p WITH (NOLOCK) ON
    p.partition_id = dps.partition_id ' END + '
    --WHERE dps.object_id > 100
    WHERE OBJECT_NAME(dps.object_id) LIKE ''' + @table_name_pattern + ''' AND
    OBJECT_NAME(dps.object_id) NOT LIKE ''' + @table_name_exclude_pattern + '''
    GROUP BY
    dps.object_id,
    dps.index_id
    ) AS base_size
    LEFT OUTER JOIN (
    SELECT
    it.parent_id,
    SUM(dps.reserved_page_count) AS total_pages,
    SUM(dps.used_page_count) AS used_pages
    FROM sys.internal_tables it WITH (NOLOCK)
    INNER JOIN sys.dm_db_partition_stats dps WITH (NOLOCK) ON
    dps.object_id = it.parent_id
    WHERE it.internal_type IN ( ''202'', ''204'', ''211'', ''212'', ''213'', ''214'', ''215'', ''216'' )
    GROUP BY
    it.parent_id
    ) AS internal_size ON base_size.index_id IN (0, 1) AND internal_size.parent_id = base_size.object_id
    '
    IF @debug >= 1
    PRINT @sql
    EXEC(@sql)

    --**********************************************************************************************************************

    UPDATE [is]
    SET approx_max_data_width = index_cols.approx_max_data_width
    FROM #index_specs [is]
    INNER JOIN (
    SELECT index_col_ids.object_id, index_col_ids.index_id,
    SUM(CASE WHEN c.max_length = -1 THEN 16 ELSE c.max_length END) AS approx_max_data_width
    FROM (
    SELECT ic.object_id, ic.index_id, ic.column_id
    --,object_name(ic.object_id)
    FROM sys.index_columns ic
    WHERE
    ic.object_id > 100
    UNION
    SELECT i_nonclus.object_id, i_nonclus.index_id, ic_clus.column_id
    --,object_name(i_nonclus.object_id)
    FROM sys.indexes i_nonclus
    CROSS APPLY (
    SELECT ic_clus2.column_id
    --,object_name(ic_clus2.object_id),ic_clus2.key_ordinal
    FROM sys.index_columns ic_clus2
    WHERE
    ic_clus2.object_id = i_nonclus.object_id AND
    ic_clus2.index_id = 1 AND
    ic_clus2.key_ordinal > 0 --technically superfluous, since clus index can't have include'd cols anyway
    ) AS ic_clus
    WHERE
    i_nonclus.object_id > 100 AND
    i_nonclus.index_id > 1
    ) AS index_col_ids
    INNER JOIN sys.columns c ON c.object_id = index_col_ids.object_id AND c.column_id = index_col_ids.column_id
    GROUP BY index_col_ids.object_id, index_col_ids.index_id
    ) AS index_cols ON index_cols.object_id = [is].object_id AND index_cols.index_id = [is].index_id

    UPDATE ispec
    SET table_mb = ispec_ranking.table_mb,
    size_rank = ispec_ranking.size_rank
    FROM #index_specs ispec
    INNER JOIN (
    SELECT *, ROW_NUMBER() OVER(ORDER BY table_mb DESC, rows DESC, OBJECT_NAME(object_id)) AS size_rank
    FROM (
    SELECT object_id, SUM(alloc_mb) AS table_mb, MAX(rows) AS rows
    FROM #index_specs
    GROUP BY object_id
    ) AS ispec_allocs
    ) AS ispec_ranking ON
    ispec_ranking.object_id = ispec.object_id

    --**********************************************************************************************************************

    IF @list_missing_indexes = 1
    BEGIN
    SELECT
    IDENTITY(int, 1, 1) AS ident,
    DB_NAME(mid.database_id) AS Db_Name,
    CONVERT(varchar(10), GETDATE(), 120) AS capture_date,
    ispec.size_rank, ispec.table_mb,
    CASE WHEN @format_counts = 1 THEN REPLACE(CONVERT(varchar(20), CAST(dps.row_count AS money), 1), '.00', '')
    WHEN @format_counts = 2 THEN CAST(CAST(dps.row_count * 1.0 / CASE ca1.row_count_suffix
    WHEN 'M' THEN 1000000 WHEN 'K' THEN 1000 ELSE 1 END AS int) AS varchar(20)) + ca1.row_count_suffix
    WHEN @format_counts = 3 THEN CAST(CAST(dps.row_count * 1.0 / CASE ca1.row_count_suffix
    WHEN 'M' THEN 1000000 WHEN 'K' THEN 1000 ELSE 1 END AS decimal(14, 1)) AS varchar(20)) + ca1.row_count_suffix
    ELSE CAST(dps.row_count AS varchar(20)) END AS row_count,
    CASE WHEN @include_schema_in_table_names = 1 THEN OBJECT_SCHEMA_NAME(mid.object_id /*, mid.database_id*/) + '.'
    ELSE '' END + OBJECT_NAME(mid.object_id /*, mid.database_id*/) AS Table_Name,
    mid.equality_columns, mid.inequality_columns,
    LEN(mid.included_columns) - LEN(REPLACE(mid.included_columns, ',', '')) + 1 AS incl_col_count,
    mid.included_columns,
    user_seeks, user_scans, NULL AS max_days_active, /*cj1.max_days_active,*/ unique_compiles,
    last_user_seek, last_user_scan,
    CAST(avg_total_user_cost AS decimal(9, 3)) AS avg_total_user_cost,
    CAST(avg_user_impact AS decimal(9, 3)) AS [avg_user_impact%],
    system_seeks, system_scans, last_system_seek, last_system_scan,
    CAST(avg_total_system_cost AS decimal(9, 3)) AS avg_total_system_cost,
    CAST(avg_system_impact AS decimal(9, 3)) AS [avg_system_impact%],
    mid.statement, mid.object_id, mid.index_handle
    INTO #index_missing
    FROM sys.dm_db_missing_index_details mid WITH (NOLOCK)
    INNER JOIN sys.indexes i ON i.object_id = mid.object_id AND i.index_id IN (0, 1) AND i.data_space_id <= 32767
    LEFT OUTER JOIN sys.dm_db_missing_index_groups mig WITH (NOLOCK) ON
    mig.index_handle = mid.index_handle
    LEFT OUTER JOIN sys.dm_db_missing_index_group_stats migs WITH (NOLOCK) ON
    migs.group_handle = mig.index_group_handle
    LEFT OUTER JOIN sys.dm_db_partition_stats dps WITH (NOLOCK) ON
    dps.object_id = mid.object_id AND
    dps.index_id IN (0, 1)
    OUTER APPLY (
    SELECT CASE WHEN dps.row_count >= 1000000 THEN 'M' WHEN dps.row_count >= 1000 THEN 'K' ELSE '' END AS row_count_suffix
    ) AS ca1
    OUTER APPLY (
    SELECT ispec.table_mb, ispec.size_rank
    FROM dbo.#index_specs ispec
    WHERE
    ispec.object_id = mid.object_id AND
    ispec.index_id IN (0, 1)
    ) AS ispec
    --order by
    --DB_NAME, Table_Name, equality_columns
    WHERE
    1 = 1
    AND mid.database_id = DB_ID()
    AND OBJECT_NAME(mid.object_id) LIKE @table_name_pattern
    ORDER BY
    --avg_total_user_cost * (user_seeks + user_scans) DESC,
    Db_Name,
    CASE WHEN @order_by IN (-2, 2) THEN ispec.size_rank * -SIGN(@order_by) ELSE 0 END,
    Table_Name,
    equality_columns, inequality_columns,
    user_seeks DESC
    SELECT *
    FROM #index_missing
    ORDER BY ident
    /*
    IF @list_missing_indexes_summary = 1
    BEGIN
    SELECT
    derived.Size_Rank, derived.table_mb,
    derived.Table_Name, derived.Equality_Column, derived.Equality#, derived.User_Seeks,
    ISNULL((SELECT SUM(user_seeks)
    FROM #index_missing im2
    OUTER APPLY dbo.DelimitedSplit8K (inequality_columns, ',') ds
    WHERE im2.Size_Rank = derived.Size_Rank AND
    LTRIM(RTRIM(ds.Item)) = derived.Equality_Column
    ), 0) AS Inequality_Seeks,
    derived.User_Scans, derived.Last_User_Seek, derived.Last_User_Scan,
    derived.Max_Days_Active, derived.Avg_Total_User_Cost, derived.Approx_Total_Cost
    FROM (
    SELECT
    Size_Rank, MAX(table_mb) AS table_mb, Table_Name, LTRIM(RTRIM(ds.Item)) AS Equality_Column,
    SUM(user_seeks) AS User_Seeks, SUM(user_scans) AS User_Scans,
    MAX(last_user_seek) AS Last_User_Seek, MAX(last_user_scan) AS Last_User_Scan,
    MIN(max_days_active) AS Max_Days_Active,
    MAX(avg_total_user_cost) AS Avg_Total_User_Cost,
    (SUM(user_seeks) + SUM(user_scans)) * MAX(avg_total_user_cost) AS Approx_Total_Cost,
    MAX(ds.ItemNumber) AS Equality#
    FROM #index_missing
    CROSS APPLY dbo.DelimitedSplit8K (equality_columns, ',') ds
    WHERE equality_columns IS NOT NULL
    GROUP BY size_rank, Table_Name, LTRIM(RTRIM(ds.Item))
    ) AS derived
    ORDER BY Size_Rank, Table_Name, Approx_Total_Cost DESC
    END --IF
    */
    END --IF

    PRINT 'Index Usage Stats @ ' + CONVERT(varchar(30), GETDATE(), 120)

    --**********************************************************************************************************************

    -- list index usage stats (seeks, scans, etc.)
    SELECT
    IDENTITY(int, 1, 1) AS ident,
    DB_NAME() AS db_name,
    ispec.size_rank, ispec.alloc_mb - ispec.used_mb AS unused_mb,
    CASE WHEN i.data_space_id <= 32767 THEN FILEGROUP_NAME(i.data_space_id) ELSE '{CS}' END AS main_fg_name,
    CAST(NULL AS int) AS filler,
    CASE WHEN @include_schema_in_table_names = 1 THEN OBJECT_SCHEMA_NAME(i.object_id /*, DB_ID()*/) + '.'
    ELSE '' END + OBJECT_NAME(i.object_id /*, i.database_id*/) AS Table_Name,
    key_cols AS key_cols, nonkey_cols AS nonkey_cols,
    LEN(nonkey_cols) - LEN(REPLACE(nonkey_cols, ',', '')) + 1 AS nonkey_count,
    CAST(NULL AS varchar(100)) AS filler2,
    ius.user_seeks, ius.user_scans, --ius.user_seeks + ius.user_scans AS total_reads,
    ius.user_lookups, ius.user_updates,
    CASE WHEN @format_counts = 1 THEN REPLACE(CONVERT(varchar(20), CAST(dps.row_count AS money), 1), '.00', '')
    WHEN @format_counts = 2 THEN CAST(CAST(dps.row_count * 1.0 / CASE ca1.row_count_suffix
    WHEN 'M' THEN 1000000 WHEN 'K' THEN 1000 ELSE 1 END AS int) AS varchar(20)) + ca1.row_count_suffix
    WHEN @format_counts = 3 THEN CAST(CAST(dps.row_count * 1.0 / CASE ca1.row_count_suffix
    WHEN 'M' THEN 1000000 WHEN 'K' THEN 1000 ELSE 1 END AS decimal(14, 1)) AS varchar(20)) + ca1.row_count_suffix
    ELSE CAST(dps.row_count AS varchar(20)) END AS row_count,
    ispec.alloc_gb AS index_gb, ispec.table_gb,
    SUBSTRING('NY', CAST(i.is_primary_key AS int) + CAST(i.is_unique_constraint AS int) + 1, 1) +
    CASE WHEN i.is_unique = CAST(i.is_primary_key AS int) + CAST(i.is_unique_constraint AS int) THEN ''
    ELSE '.' + SUBSTRING('NY', CAST(i.is_unique AS int) + 1, 1) END AS [Uniq?],
    REPLACE(i.name, oa1.table_name, '~') AS index_name,
    i.index_id,
    ispec.approx_max_data_width AS [data_width],
    CAST(CAST(ispec.used_mb AS float) * 1024.0 * 1024.0 / NULLIF(dps.row_count, 0) AS int) AS cmptd_row_size,
    CASE
    WHEN ispec.max_compression IS NULL THEN '(Not applicable)'
    WHEN ispec.max_compression = 2 THEN 'Page'
    WHEN ispec.max_compression = 1 THEN 'Row'
    WHEN ispec.max_compression = 0 THEN ''
    ELSE '(Unknown)' END AS max_compression,
    i.fill_factor,
    dios.leaf_delete_count + dios.leaf_insert_count + dios.leaf_update_count as leaf_mod_count,
    dios.range_scan_count, dios.singleton_lookup_count,
    DATEDIFF(DAY, STATS_DATE ( i.object_id , i.index_id ), GETDATE()) AS stats_days_old,
    DATEDIFF(DAY, CASE
    WHEN o.create_date > @sql_startup_date AND @sql_startup_date > o.modify_date THEN o.create_date
    WHEN o.create_date > @sql_startup_date AND o.modify_date > @sql_startup_date THEN o.modify_date
    ELSE @sql_startup_date END, GETDATE()) AS max_days_active,
    dios.row_lock_count, dios.row_lock_wait_in_ms,
    dios.page_lock_count, dios.page_lock_wait_in_ms,
    ius.last_user_seek, ius.last_user_scan,
    ius.last_user_lookup, ius.last_user_update,
    fk.Reference_Count AS fk_ref_count,
    ius2.row_num,
    ius.system_seeks, ius.system_scans, ius.system_lookups, ius.system_updates,
    ius.last_system_seek, ius.last_system_scan, ius.last_system_lookup, ius.last_system_update,
    GETDATE() AS capture_date
    INTO #index_usage
    FROM sys.indexes i WITH (NOLOCK)
    INNER JOIN sys.objects o WITH (NOLOCK) ON
    o.object_id = i.object_id
    INNER JOIN dbo.#index_specs ispec ON
    ispec.object_id = i.object_id AND
    ispec.index_id = i.index_id
    OUTER APPLY (
    SELECT CASE WHEN EXISTS(SELECT 1 FROM #index_specs [is] WHERE [is].object_id = i.object_id AND [is].index_id = 1)
    THEN 1 ELSE 0 END AS has_clustered_index
    ) AS cj2
    OUTER APPLY (
    SELECT STUFF((
    SELECT
    ', ' + COL_NAME(ic.object_id, ic.column_id)
    FROM sys.index_columns ic WITH (NOLOCK)
    WHERE
    ic.key_ordinal > 0 AND
    ic.object_id = i.object_id AND
    ic.index_id = i.index_id
    ORDER BY
    ic.key_ordinal
    FOR XML PATH('')
    ), 1, 2, '')
    ) AS key_cols (key_cols)
    OUTER APPLY (
    SELECT STUFF((
    SELECT
    ', ' + COL_NAME(ic.object_id, ic.column_id)
    FROM sys.index_columns ic WITH (NOLOCK)
    WHERE
    ic.key_ordinal = 0 AND
    ic.object_id = i.object_id AND
    ic.index_id = i.index_id
    ORDER BY
    COL_NAME(ic.object_id, ic.column_id)
    FOR XML PATH('')
    ), 1, 2, '')
    ) AS nonkey_cols (nonkey_cols)
    LEFT OUTER JOIN sys.dm_db_partition_stats dps WITH (NOLOCK) ON
    dps.object_id = i.object_id AND
    dps.index_id = i.index_id
    LEFT OUTER JOIN sys.dm_db_index_usage_stats ius WITH (NOLOCK) ON
    ius.database_id = DB_ID() AND
    ius.object_id = i.object_id AND
    ius.index_id = i.index_id
    LEFT OUTER JOIN (
    SELECT
    database_id, object_id, MAX(user_scans) AS user_scans,
    ROW_NUMBER() OVER (ORDER BY MAX(user_scans) DESC) AS row_num --user_scans|user_seeks+user_scans
    FROM sys.dm_db_index_usage_stats WITH (NOLOCK)
    WHERE
    database_id = DB_ID()
    --AND index_id > 0
    GROUP BY
    database_id, object_id
    ) AS ius2 ON
    ius2.database_id = DB_ID() AND
    ius2.object_id = i.object_id
    LEFT OUTER JOIN (
    SELECT
    referenced_object_id, COUNT(*) AS Reference_Count
    FROM sys.foreign_keys WITH (NOLOCK)
    WHERE
    is_disabled = 0
    GROUP BY
    referenced_object_id
    ) AS fk ON
    fk.referenced_object_id = i.object_id
    LEFT OUTER JOIN #index_operational_stats dios ON
    dios.object_id = i.object_id AND
    dios.index_id = i.index_id
    OUTER APPLY (
    SELECT OBJECT_NAME(i.object_id/*, DB_ID()*/) AS table_name
    ) AS oa1
    OUTER APPLY (
    SELECT CASE WHEN dps.row_count >= 1000000 THEN 'M' WHEN dps.row_count >= 1000 THEN 'K' ELSE '' END AS row_count_suffix
    ) AS ca1
    WHERE
    --i.object_id > 100 AND
    (i.is_disabled = 0 OR @order_by IN (-1, 1)) AND
    i.is_hypothetical = 0 AND
    i.data_space_id <= 32767 AND
    --i.type IN (0, 1, 2) AND
    o.type NOT IN ( 'IF', 'IT', 'TF', 'TT' ) AND
    (
    o.name LIKE @table_name_pattern AND
    o.name NOT LIKE 'dtprop%' AND
    o.name NOT LIKE 'filestream[_]' AND
    o.name NOT LIKE 'MSpeer%' AND
    o.name NOT LIKE 'MSpub%' AND
    --o.name NOT LIKE 'tmp[_]%' AND
    --o.name NOT LIKE 'queue[_]%' AND
    --(DB_NAME() IN ('master', 'msdb') OR o.name NOT LIKE 'sys%')
    (@include_system_tables = 1 OR o.name NOT LIKE 'sys%')
    --AND o.name NOT LIKE 'tmp%'
    ) AND
    (@filegroup_name IS NULL OR CASE WHEN i.data_space_id <= 32767 THEN FILEGROUP_NAME(i.data_space_id) ELSE '{CS}' END LIKE @filegroup_name) AND
    (@max_compression IS NULL OR ispec.max_compression <= @max_compression)
    ORDER BY
    --cj2.has_clustered_index, ispec.size_rank, --heaps first, by size
    db_name,
    --i.index_id,
    --ius.user_seeks - ius.user_scans,
    CASE WHEN @order_by IN (-2, 2) THEN ispec.size_rank * -SIGN(@order_by) ELSE 0 END,
    --ius.user_scans DESC,
    --ius2.row_num, --user_scans&|user_seeks
    table_name,
    -- list clustered index first, if any, then other index(es)
    CASE WHEN i.index_id IN (0, 1) THEN 1 ELSE 2 END,
    key_cols
    OPTION (MAXDOP 3, RECOMPILE)

    SELECT *
    FROM #index_usage
    ORDER BY ident

    IF @list_total_size > 1
    SELECT SUM(index_gb) AS Total_Size_GB
    FROM #index_usage

    IF @list_filegroup_and_drive_summary = 1
    SELECT
    LEFT(df.physical_name, 1) AS drive,
    FILEGROUP_NAME(au_totals.data_space_id) AS filegroup_name,
    au_totals.total_mb AS total_fg_mb,
    au_totals.used_mb AS used_fg_mb,
    au_totals.total_mb - au_totals.used_mb AS free_fg_mb,
    CAST(df.size / 128.0 AS decimal(9, 3)) AS file_size_mb
    FROM (
    SELECT
    au.data_space_id,
    CAST(SUM(au.total_pages) / 128.0 AS decimal(9, 3)) AS total_mb,
    CAST(SUM(au.used_pages) / 128.0 AS decimal(9, 3)) AS used_mb
    FROM sys.allocation_units au
    INNER JOIN sys.filegroups fg ON
    fg.data_space_id = au.data_space_id
    GROUP BY au.data_space_id WITH ROLLUP
    ) AS au_totals
    INNER JOIN sys.database_files df ON
    df.data_space_id = au_totals.data_space_id
    ORDER BY filegroup_name, drive

    PRINT 'Ended @ ' + CONVERT(varchar(30), GETDATE(), 120)

    --**********************************************************************************************************************

    SET DEADLOCK_PRIORITY @deadlock_priority
    IF @transaction_isolation_level = 1
    SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
    ELSE
    IF @transaction_isolation_level = 2
    SET TRANSACTION ISOLATION LEVEL READ COMMITTED
    ELSE
    IF @transaction_isolation_level = 3
    SET TRANSACTION ISOLATION LEVEL REPEATABLE READ
    ELSE
    IF @transaction_isolation_level = 4
    SET TRANSACTION ISOLATION LEVEL SERIALIZABLE
    ELSE
    IF @transaction_isolation_level = 5
    SET TRANSACTION ISOLATION LEVEL SNAPSHOT

    SQL DBA,SQL Server MVP(07, 08, 09) "Money can't buy you happiness." Maybe so, but it can make your unhappiness a LOT more comfortable!

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