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

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<p mce_keep="true"> 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



IF

OBJECT_ID (‘z_IUQ2_Temp_Index_Keys’, ‘U’) IS NOT NULL

DROP

TABLE z_IUQ2_Temp_Index_Keys;

– Generate list of indexes with key list



create

table z_IUQ2_Temp_Index_Keys(

[l1] [int]

NOT NULL,

[F_Obj_ID] [int]

NOT NULL,

[F_Schema_Name] [nvarchar]

(128) NULL,

[F_Table_Name] [nvarchar]

(128) NOT NULL,

[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) NOT NULL,

[F_Index_ID] [int]

NOT NULL,

[F_Column_Name] [nvarchar]

(128) NOT NULL,

[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) NOT NULL,

[F_Index_Column_ID] [int]

NOT NULL,

[F_Last_Seek] [datetime]

NULL,

[F_Last_Scan] [datetime]

NULL,

[F_Last_Lookup] [datetime]

NULL,

[Index_Key_List] [nvarchar]

(MAX) NULL

)



go



CREATE

NONCLUSTERED INDEX [Object_ID_Index] ON [dbo].[z_IUQ2_Temp_Index_Keys]

(

[F_Obj_ID] ASC

)



go



CREATE

NONCLUSTERED INDEX [Index_ID_Index] ON [dbo].[z_IUQ2_Temp_Index_Keys]

(

[F_Index_ID] ASC

)



go



CREATE

NONCLUSTERED INDEX [RowCount_ID_Index] ON [dbo].[z_IUQ2_Temp_Index_Keys]

(

[F_Row_Count] ASC

)



go



insert

into

z_IUQ2_Temp_Index_Keys



SELECT



(

row_number() over(order by 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,

(

CASE WHEN (a1.used + ISNULL(a4.used,0)) > a1.data THEN (a1.used + ISNULL(a4.used,0)) - a1.data ELSE 0 END) * 8 AS index_size,

(

CASE WHEN (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

end

as 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





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