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The SQL query below shows a list of tables sorted by the largest tables first. For each table, the indexes in the table are shown. For each index it shows when the index was last used. The query is designed to collect various pieces of information in one place, and give an overview to help supporting decisions when doing index tuning.
The left hand columns show data for the table (No. of receords, data- and index size) to have a view of the impact of having indexes on the table.
The right hand columns show data for each index, including Updates (costs) and Reads (benefits) and when it was last used sine the last time SQL Server was restarted.
Further comments:
- The query only works on SQL Server 2005 and later.
- The numbers in the query are reset every time SQL Server restarts.
- The query may take up to a few minutes to run.
- The query is provided "as is", with no warranties and confers no rights. You assume all risk for your use.
If you have comments or feedback, please feel free to post them here.
Best regards
Lars Lohndorf-Larsen
Microsoft Dynamics UK
Microsoft Customer Service and Support (CSS) EMEA
--use NavisionDatabase
IFOBJECT_ID('z_IUQ2_Temp_Index_Keys','U')ISNOTNULL
DROPTABLE z_IUQ2_Temp_Index_Keys;
-- Generate list of indexes with key list
createtable z_IUQ2_Temp_Index_Keys(
[l1] [int] NOTNULL,
[F_Obj_ID] [int] NOTNULL,
[F_Schema_Name] [nvarchar] (128)NULL,
[F_Table_Name] [nvarchar] (128)NOTNULL,
[F_Row_Count] [int] NULL,
[F_Reserved] [int] NULL,
[F_Data] [int] NULL,
[F_Index_Size] [int] NULL,
[F_UnUsed] [int] NULL,
[F_Index_Name] [nvarchar] (128)NOTNULL,
[F_Index_ID] [int] NOTNULL,
[F_Column_Name] [nvarchar] (128)NOTNULL,
[F_User_Updates] [int] NULL,
[F_User_Reads] [int] NULL,
[F_Last_Used] [datetime] NULL,
[F_Index_Type] [nvarchar] (128)NOTNULL,
[F_Index_Column_ID] [int] NOTNULL,
[F_Last_Seek] [datetime] NULL,
[F_Last_Scan] [datetime] NULL,
[F_Last_Lookup] [datetime] NULL,
[Index_Key_List] [nvarchar] (MAX)NULL
)
go
CREATENONCLUSTEREDINDEX [Object_ID_Index] ON [dbo].[z_IUQ2_Temp_Index_Keys]
([F_Obj_ID] ASC
)
go
CREATENONCLUSTEREDINDEX [Index_ID_Index] ON [dbo].[z_IUQ2_Temp_Index_Keys]
([F_Index_ID] ASC
)
go
CREATENONCLUSTEREDINDEX [RowCount_ID_Index] ON [dbo].[z_IUQ2_Temp_Index_Keys]
([F_Row_Count] ASC
)
go
insertinto
z_IUQ2_Temp_Index_Keys
SELECT
(row_number()over(orderby a3.name, a2.name))%2 as l1,
a1.object_id,---
a3.name AS [schemaname],
a2.name AS [tablename],
a1.rows as row_count,
(a1.reserved +ISNULL(a4.reserved,0))* 8 AS reserved,
a1.data * 8 AS data,
(CASEWHEN(a1.used +ISNULL(a4.used,0))> a1.data THEN(a1.used +ISNULL(a4.used,0))- a1.data ELSE 0 END)* 8 AS index_size,
(CASEWHEN(a1.reserved +ISNULL(a4.reserved,0))> a1.used THEN(a1.reserved +ISNULL(a4.reserved,0))- a1.used ELSE 0 END)* 8 AS unused,
-- Index Description
SI.name,
SI.Index_ID,
index_col(object_name(SIC.object_id),SIC.index_id,SIC.Index_Column_ID),
-- Index Stats
US.user_updates,
US.user_seeks + US.user_scans + US.user_lookups User_Reads,
case
when(ISNULL(US.last_user_seek,'00:00:00.000')>=ISNULL(US.last_user_scan,'00:00:00.000'))and(ISNULL(US.last_user_seek,'00:00:00.000')>=ISNULL(US.last_user_lookup,'00:00:00.000'))then US.last_user_seek
when(ISNULL(US.last_user_scan,'00:00:00.000')>=ISNULL(US.last_user_seek,'00:00:00.000'))and(ISNULL(US.last_user_scan,'00:00:00.000')>=ISNULL(US.last_user_lookup,'00:00:00.000'))then US.last_user_scan
else US.last_user_lookup
endas Last_Used_For_Reads,
SI.type_desc,
SIC.index_column_id,
US.last_user_seek,
US.last_user_scan,
US.last_user_lookup,
''
FROM
(SELECT
ps.object_id,
SUM(
CASE
WHEN(ps.index_id < 2)THEN row_count
ELSE 0
END
)AS [rows],
SUM(ps.reserved_page_count)AS reserved,
SUM(
CASE
WHEN(ps.index_id < 2)THEN(ps.in_row_data_page_count + ps.lob_used_page_count + ps.row_overflow_used_page_count)
ELSE(ps.lob_used_page_count + ps.row_overflow_used_page_count)
END
)AS data,
SUM(ps.used_page_count)AS used
FROMsys.dm_db_partition_stats ps
GROUPBY ps.object_id)AS a1
LEFTOUTERJOIN
(SELECT
it.parent_id,
SUM(ps.reserved_page_count)AS reserved,
SUM(ps.used_page_count)AS used
FROMsys.dm_db_partition_stats ps
INNERJOINsys.internal_tables it ON(it.object_id= ps.object_id)
WHERE it.internal_type IN(202,204)
GROUPBY it.parent_id)AS a4 ON(a4.parent_id = a1.object_id)
INNERJOINsys.all_objects a2 ON( a1.object_id= a2.object_id)
INNERJOINsys.schemas a3 ON(a2.schema_id= a3.schema_id)
innerjoinsys.indexes SI ON(SI.object_id= a1."object_id")---
innerjoinsys.index_columns SIC ON(SIC.object_id= SI.object_idand SIC.index_id = SI.index_id)
leftouterjoinsys.dm_db_index_usage_stats US ON(US.object_id= SI.object_idand US.index_id = SI.index_id)
WHERE a2.type <> N'S'and a2.type <> N'IT'
orderby row_count desc
go
-- Populate key string
declare IndexCursor cursorfor
select F_Obj_ID, F_Index_ID from z_IUQ2_Temp_Index_Keys
forupdateof Index_Key_List
declare @objID int
declare @IndID int
declare @KeyString VARCHAR(MAX)
set @KeyString =NULL
open IndexCursor
setnocounton
fetchnextfrom IndexCursor into @ObjID, @IndID
while@@fetch_status= 0 begin
set @KeyString =''
select @KeyString =COALESCE(@KeyString,'')+ F_Column_Name +', '
from z_IUQ2_Temp_Index_Keys
where F_Obj_ID = @ObjID and F_Index_ID = @IndID
ORDERBY F_Index_ID, F_Index_Column_ID
set @KeyString =LEFT(@KeyString,LEN(@KeyString)-2)
update z_IUQ2_Temp_Index_Keys
set Index_Key_List = @KeyString
wherecurrentof IndexCursor
fetchnextfrom IndexCursor into @ObjID, @IndID
end;
close IndexCursor
deallocate IndexCursor
go
-- clean up table to one line per index
deletefrom z_IUQ2_Temp_Index_Keys
where [F_Index_Column_ID] > 1
go
select
[F_Table_Name] TableName,
[F_Row_Count] No_Of_Records,
[F_Data] Data_Size,
[F_Index_Size] Index_Size,
[F_UnUsed] UnUsed_Space,
[F_Index_Name] Index_Name,
[F_User_Updates] Index_Updates,
[F_User_Reads] Index_Reads,
[F_Last_Used] Index_Last_Used,
[F_Index_Type] Index_Type,
[Index_Key_List] Index_Fields
from z_IUQ2_Temp_Index_Keys
orderby F_Row_Count desc, F_Table_Name, [F_Index_ID]
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