check DB statistics status

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check DB statistics status

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sandhyarao49

Posted Thursday, January 01, 2009 3:45 PM

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Hi All.

Can any one tell me where and how to check DB statistics status on a particular server.
And is there any way to see that it was last updated and much more details about the db statistice.

Atlast how to update the statistics of a DB

Regards,
Sandhya

Post #628530

bitbucket-25253

Posted Thursday, January 01, 2009 4:03 PM

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For a over view of DB statistics please read
ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/tsqlref9/html/919158f2-38d0-4f68-82ab-e1633bd0d308.htm

To determine the statistics for a particular table or view use:

To display a report on the indexes of an object, execute sp_helpindex and specify the table or view name.

If everything seems to be going well, you have obviously overlooked something.

Ron

Please help us, help you -before posting a question please read
Before posting a performance problem please read

Post #628532

Jonathan Kehayias

Posted Thursday, January 01, 2009 9:58 PM

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You can also query the sys.stats DMV to findout information about what statistics exist on particular tables. You can join it to the sys.stats_columns DMV to get column info.

Jonathan Kehayias | Principal Consultant | MCM: SQL Server 2008
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Troubleshooting SQL Server: A Guide for Accidental DBAs

Post #628594

Paresh Prajapati

Posted Thursday, January 01, 2009 10:38 PM

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sandhyarao49 (1/1/2009)

----------------------------------------------------------------------------

SELECT name AS index_name,
STATS_DATE(OBJECT_ID, index_id) AS statistics_update_date
FROM sys.indexes

--------------------------------------------------------------------------------

ALTER PROCEDURE [dbo].[usp_Detail_Index_Stats] @table_name sysname
AS

----------------------------------------------------------------------------------
-- ******VARIABLE DECLARATIONS******
----------------------------------------------------------------------------------
DECLARE @IndexTable TABLE
(
[Database] sysname, [Table] sysname, [Index Name] sysname NULL, index_id smallint,
[object_id] INT, [Index Type] VARCHAR(20), [Alloc Unit Type] VARCHAR(20),
[Avg Frag %] decimal(5,2), [Row Ct] bigint, [Stats Update Dt] datetime
)

DECLARE @dbid smallint --Database id for current database
DECLARE @objectid INT --Object id for table being analyzed
DECLARE @indexid INT --Index id for the target index for the STATS_DATE() function

----------------------------------------------------------------------------------
-- ******VARIABLE ASSIGNMENTS******
----------------------------------------------------------------------------------
SELECT @dbid = DB_ID(DB_NAME())
SELECT @objectid = OBJECT_ID(@table_name)

----------------------------------------------------------------------------------
-- ******Load @IndexTable with Index Metadata******
----------------------------------------------------------------------------------
INSERT INTO @IndexTable
(
[Database], [Table], [Index Name], index_id, [object_id],
[Index Type], [Alloc Unit Type], [Avg Frag %], [Row Ct]
)
SELECT
DB_NAME() AS "Database"
@table_name AS "Table"
SI.NAME AS "Index Name"
IPS.index_id, IPS.OBJECT_ID, --These fields included for joins only
IPS.index_type_desc, --Heap, Non-clustered, or Clustered
IPS.alloc_unit_type_desc, --In-row data or BLOB data
CAST(IPS.avg_fragmentation_in_percent AS decimal(5,2)),
IPS.record_count
FROM sys.dm_db_index_physical_stats (@dbid, @objectid, NULL, NULL, 'sampled') IPS
LEFT JOIN sys.sysindexes SI ON IPS.OBJECT_ID = SI.id AND IPS.index_id = SI.indid
WHERE IPS.index_id <> 0

----------------------------------------------------------------------------------
-- ******ADD STATISTICS INFORMATION******
----------------------------------------------------------------------------------
DECLARE curIndex_ID CURSOR FOR
SELECT I.index_id
FROM @IndexTable I
ORDER BY I.index_id

OPEN curIndex_ID
FETCH NEXT FROM curIndex_ID INTO @indexid

WHILE @@FETCH_STATUS = 0
BEGIN
UPDATE @IndexTable
SET [Stats Update Dt] = STATS_DATE(@objectid, @indexid)
WHERE [object_id] = @objectid AND [index_id] = @indexid

FETCH NEXT FROM curIndex_ID INTO @indexid
END

CLOSE curIndex_ID
DEALLOCATE curIndex_ID

----------------------------------------------------------------------------------
-- ******RETURN RESULTS******
----------------------------------------------------------------------------------
SELECT I.[Database], I.[Table], I.[Index Name], "Index Type"=
CASE I.[Index Type]
WHEN 'NONCLUSTERED INDEX' THEN 'NCLUST'
WHEN 'CLUSTERED INDEX' THEN 'CLUST'
ELSE 'HEAP'
END,
I.[Avg Frag %], I.[Row Ct],
CONVERT(VARCHAR, I.[Stats Update Dt], 110) AS "Stats Dt"
FROM @IndexTable I
ORDER BY I.[Index Type], I.[index_id]
-------

--------------------------------------------------------------------------------

Query 1

In this first query we are just using sys.dm_db_index_usage_stats and sys.objects to get a list of the indexes that have been used and how they are being used.

SELECT DB_NAME(DATABASE_ID) AS DATABASENAME,
OBJECT_NAME(B.OBJECT_ID) AS TABLENAME,
INDEX_NAME = (SELECT NAME
FROM SYS.INDEXES A
WHERE A.OBJECT_ID = B.OBJECT_ID
AND A.INDEX_ID = B.INDEX_ID),
USER_SEEKS,
USER_SCANS,
USER_LOOKUPS,
USER_UPDATES
FROM SYS.DM_DB_INDEX_USAGE_STATS B
INNER JOIN SYS.OBJECTS C
ON B.OBJECT_ID = C.OBJECT_ID
WHERE DATABASE_ID = DB_ID(DB_NAME())
AND C.TYPE <> 'S'

--------------------------------------------------------------------------------

Query 2

In this query we are listing each user table and all of the tables indexes that have not been used by using a NOT EXISTS against sys.dm_db_index_usage_stats.

SELECT DB_NAME() AS DATABASENAME,
OBJECT_NAME(B.OBJECT_ID) AS TABLENAME,
B.NAME AS INDEXNAME,
B.INDEX_ID
FROM SYS.OBJECTS A
INNER JOIN SYS.INDEXES B
ON A.OBJECT_ID = B.OBJECT_ID
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 A.TYPE <> 'S'
ORDER BY 1, 2, 3

--------------------------------------------------------------------------------

Query 3

In this query we are listing each user table, all of its indexes and the columns that make up the index. The issue with this query is that you have a row for each column in the index which could get confusing if you have a lot of indexes.

SELECT A.NAME,
B.NAME,
C.KEY_ORDINAL,
D.NAME
FROM SYS.OBJECTS A
INNER JOIN SYS.INDEXES B
ON A.OBJECT_ID = B.OBJECT_ID
INNER JOIN SYS.INDEX_COLUMNS C
ON B.OBJECT_ID = C.OBJECT_ID
AND B.INDEX_ID = C.INDEX_ID
INNER JOIN SYS.COLUMNS D
ON C.OBJECT_ID = D.OBJECT_ID
AND C.COLUMN_ID = D.COLUMN_ID
WHERE A.TYPE <> 'S'
ORDER BY 1, 2, 3

--------------------------------------------------------------------------------

Query 4

In this query we use most of Query 3, but we are doing a PIVOT so we can see the index and the index columns in one row. This only accounts for 7 index columns, but it could easily be increased to handle more in the PIVOT operation. Here is another tip related to the use of PIVOT, Crosstab queries using PIVOT in SQL Server 2005. if you would like to better understand how PIVOT works.

SELECT TABLENAME, INDEXNAME, INDEXID, [1] AS COL1, [2] AS COL2, [3] AS COL3,
[4] AS COL4, [5] AS COL5, [6] AS COL6, [7] AS COL7
FROM (SELECT A.NAME AS TABLENAME,
B.NAME AS INDEXNAME,
B.INDEX_ID AS INDEXID,
D.NAME AS COLUMNNAME,
C.KEY_ORDINAL
FROM SYS.OBJECTS A
INNER JOIN SYS.INDEXES B
ON A.OBJECT_ID = B.OBJECT_ID
INNER JOIN SYS.INDEX_COLUMNS C
ON B.OBJECT_ID = C.OBJECT_ID
AND B.INDEX_ID = C.INDEX_ID
INNER JOIN SYS.COLUMNS D
ON C.OBJECT_ID = D.OBJECT_ID
AND C.COLUMN_ID = D.COLUMN_ID
WHERE A.TYPE <> 'S') P
PIVOT
(MIN(COLUMNNAME)
FOR KEY_ORDINAL IN ( [1],[2],[3],[4],[5],[6],[7] ) ) AS PVT
ORDER BY TABLENAME, INDEXNAME;

--------------------------------------------------------------------------------

Query 5

In this query we tie in our PIVOT query above with sys.dm_db_index_usage_stats so we can look at only the indexes that have been used since the last time the stats were reset.

SELECT TABLENAME, INDEXNAME, INDEX_ID, [1] AS COL1, [2] AS COL2, [3] AS COL3,
[4] AS COL4, [5] AS COL5, [6] AS COL6, [7] AS COL7
FROM (SELECT A.NAME AS TABLENAME,
A.OBJECT_ID,
B.NAME AS INDEXNAME,
B.INDEX_ID,
D.NAME AS COLUMNNAME,
C.KEY_ORDINAL
FROM SYS.OBJECTS A
INNER JOIN SYS.INDEXES B
ON A.OBJECT_ID = B.OBJECT_ID
INNER JOIN SYS.INDEX_COLUMNS C
ON B.OBJECT_ID = C.OBJECT_ID
AND B.INDEX_ID = C.INDEX_ID
INNER JOIN SYS.COLUMNS D
ON C.OBJECT_ID = D.OBJECT_ID
AND C.COLUMN_ID = D.COLUMN_ID
WHERE A.TYPE <> 'S') P
PIVOT
(MIN(COLUMNNAME)
FOR KEY_ORDINAL IN ( [1],[2],[3],[4],[5],[6],[7] ) ) AS PVT
WHERE EXISTS (SELECT OBJECT_ID,
INDEX_ID
FROM SYS.DM_DB_INDEX_USAGE_STATS B
WHERE DATABASE_ID = DB_ID(DB_NAME())
AND PVT.OBJECT_ID = B.OBJECT_ID
AND PVT.INDEX_ID = B.INDEX_ID)
ORDER BY TABLENAME, INDEXNAME;

--------------------------------------------------------------------------------

Query 6

This query also uses the PIVOT query along with sys.dm_db_index_usage_stats so we can also see the stats on the indexes that have been used.

SELECT PVT.TABLENAME, PVT.INDEXNAME, [1] AS COL1, [2] AS COL2, [3] AS COL3,
[4] AS COL4, [5] AS COL5, [6] AS COL6, [7] AS COL7, B.USER_SEEKS,
B.USER_SCANS, B.USER_LOOKUPS
FROM (SELECT A.NAME AS TABLENAME,
A.OBJECT_ID,
B.NAME AS INDEXNAME,
B.INDEX_ID,
D.NAME AS COLUMNNAME,
C.KEY_ORDINAL
FROM SYS.OBJECTS A
INNER JOIN SYS.INDEXES B
ON A.OBJECT_ID = B.OBJECT_ID
INNER JOIN SYS.INDEX_COLUMNS C
ON B.OBJECT_ID = C.OBJECT_ID
AND B.INDEX_ID = C.INDEX_ID
INNER JOIN SYS.COLUMNS D
ON C.OBJECT_ID = D.OBJECT_ID
AND C.COLUMN_ID = D.COLUMN_ID
WHERE A.TYPE <> 'S') P
PIVOT
(MIN(COLUMNNAME)
FOR KEY_ORDINAL IN ( [1],[2],[3],[4],[5],[6],[7] ) ) AS PVT
INNER JOIN SYS.DM_DB_INDEX_USAGE_STATS B
ON PVT.OBJECT_ID = B.OBJECT_ID
AND PVT.INDEX_ID = B.INDEX_ID
AND B.DATABASE_ID = DB_ID()
ORDER BY TABLENAME, INDEXNAME;

--------------------------------------------------------------------------------

Query 7

This last query allow us to see both used and unused indexes. Since the DMV sys.dm_db_index_usage_stats only tracks when an index is used it is hard to compare the used and unused indexes. The query below allows you to see all indexes to compare both used and unused indexes since the stats were collected by using a UNION.

SELECT PVT.TABLENAME, PVT.INDEXNAME, PVT.INDEX_ID, [1] AS COL1, [2] AS COL2, [3] AS COL3,
[4] AS COL4, [5] AS COL5, [6] AS COL6, [7] AS COL7, B.USER_SEEKS,
B.USER_SCANS, B.USER_LOOKUPS
FROM (SELECT A.NAME AS TABLENAME,
A.OBJECT_ID,
B.NAME AS INDEXNAME,
B.INDEX_ID,
D.NAME AS COLUMNNAME,
C.KEY_ORDINAL
FROM SYS.OBJECTS A
INNER JOIN SYS.INDEXES B
ON A.OBJECT_ID = B.OBJECT_ID
INNER JOIN SYS.INDEX_COLUMNS C
ON B.OBJECT_ID = C.OBJECT_ID
AND B.INDEX_ID = C.INDEX_ID
INNER JOIN SYS.COLUMNS D
ON C.OBJECT_ID = D.OBJECT_ID
AND C.COLUMN_ID = D.COLUMN_ID
WHERE A.TYPE <> 'S') P
PIVOT
(MIN(COLUMNNAME)
FOR KEY_ORDINAL IN ( [1],[2],[3],[4],[5],[6],[7] ) ) AS PVT
INNER JOIN SYS.DM_DB_INDEX_USAGE_STATS B
ON PVT.OBJECT_ID = B.OBJECT_ID
AND PVT.INDEX_ID = B.INDEX_ID
AND B.DATABASE_ID = DB_ID()
UNION
SELECT TABLENAME, INDEXNAME, INDEX_ID, [1] AS COL1, [2] AS COL2, [3] AS COL3,
[4] AS COL4, [5] AS COL5, [6] AS COL6, [7] AS COL7, 0, 0, 0
FROM (SELECT A.NAME AS TABLENAME,
A.OBJECT_ID,
B.NAME AS INDEXNAME,
B.INDEX_ID,
D.NAME AS COLUMNNAME,
C.KEY_ORDINAL
FROM SYS.OBJECTS A
INNER JOIN SYS.INDEXES B
ON A.OBJECT_ID = B.OBJECT_ID
INNER JOIN SYS.INDEX_COLUMNS C
ON B.OBJECT_ID = C.OBJECT_ID
AND B.INDEX_ID = C.INDEX_ID
INNER JOIN SYS.COLUMNS D
ON C.OBJECT_ID = D.OBJECT_ID
AND C.COLUMN_ID = D.COLUMN_ID
WHERE A.TYPE <> 'S') P
PIVOT
(MIN(COLUMNNAME)
FOR KEY_ORDINAL IN ( [1],[2],[3],[4],[5],[6],[7] ) ) AS PVT
WHERE NOT EXISTS (SELECT OBJECT_ID,
INDEX_ID
FROM SYS.DM_DB_INDEX_USAGE_STATS B
WHERE DATABASE_ID = DB_ID(DB_NAME())
AND PVT.OBJECT_ID = B.OBJECT_ID
AND PVT.INDEX_ID = B.INDEX_ID)
ORDER BY TABLENAME, INDEX_ID;

--------------------------------------------------------------------------------

_____________________________________________________________________________________________________________
Paresh Prajapati

+919924626601
http://paresh-sqldba.blogspot.com/
LinkedIn | Tweet Me | FaceBook | Brijj

Post #628603

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