Nav developer: Table Information including Index information (Usage, Blocks and Reads)

[Blog bot]

The query below combines these three queries into one:
Index Usage Query
Recent Bocking History
Table Information Query



It can be used to just see the number of records in each table. But also by just changing "ORDER BY", it can be used to see which index cause most blocking / wait time / updates or locks. Or to compare Index Updates with Index Reads to get an idea of cost versus benefit for each index for the purpose of index tuning.

So in short, one query gives you:
- Index / Table Information
- Index usage (benefits and costs information for each index)
- Index locks, blocks, wait time and updates per read (cost/benefit).



The query must be run in your NAV database. It will create a table called z_IUQ2_Temp_Index_Keys and use various Dynamic Management Views to collect information for each index into this table. First time you run it, or if you want to refresh data, you must run the whole query which may take up to a minute of two for each company in the database. After that if you just want to change sorting / get the results again, then you only need to run the last part of the query, beginning with:

-- Select results


The last lines suggest various "ORDER BY"s that might be useful to enable instead of the default one, which is by Table Name.





Lars Lohndorf-Larsen

Microsoft Dynamics UK

Microsoft Customer Service and Support (CSS) EMEA

These postings are provided "AS IS" with no warranties and confer no rights. You assume all risk for your use.



--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_Locks] [int] NULL,

[F_Blocks] [int] NULL,

[F_Block_Wait_Time] [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,

-- Index blocks

IStats.row_lock_count + IStats.page_lock_count ,

IStats.row_lock_wait_count + IStats.page_lock_wait_count,

IStats.row_lock_wait_in_ms + IStats.page_lock_wait_in_ms,

-- Dates

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 and US.database_id =db_id())

leftouterjoin sys.dm_db_index_operational_stats(NULL,NULL,NULL,NULL) IStats ON(IStats.object_id= SI.object_idand IStats.index_id = SI.index_id and IStats.database_id =db_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 results

select

[F_Table_Name] TableName,

[F_Row_Count] No_Of_Records,

[F_Data] Data_Size,

[F_Index_Size] Index_Size,

[F_Index_Name] Index_Name,

[F_User_Updates] Index_Updates,

[F_User_Reads] Index_Reads,

case

when F_User_Reads = 0 then F_User_Updates

else F_User_Updates / F_User_Reads

endas Updates_Per_Read,

[F_Locks] Locks,

[F_Blocks] Blocks,

[F_Block_Wait_Time] Block_Wait_Time,

[F_Last_Used] Index_Last_Used,

[F_Index_Type] Index_Type,

[Index_Key_List] Index_Fields

from z_IUQ2_Temp_Index_Keys

--order by F_Row_Count desc, F_Table_Name, [F_Index_ID]

--order by F_User_Updates desc

--order by Blocks desc

--order by Block_Wait_Time desc

--order by Updates_Per_Read desc

orderby F_Table_Name









Читать дальше