Find last statistics updated date detail ?–Maintenance TIP #59

 

Problem:- One of the pain point in any SQL engineer  is “Performance”. There are various reasons due to which your SQL Server database is slow.

One of the possible reason is your maintenance.   You don’t know when statistics last updated and take further step if those are not updated

Solution:-

Here we have simple query to find when the statistics was last updated for a table.

SELECT o.name,
       i.name AS [Index Name], 
       STATS_DATE(i.[object_id], i.index_id) AS [Statistics Date],
       s.auto_created,
       s.no_recompute,
       s.user_created
FROM sys.objects AS o WITH (NOLOCK)
INNER JOIN sys.indexes AS i WITH (NOLOCK) ON o.[object_id] = i.[object_id]
INNER JOIN sys.stats AS s WITH (NOLOCK)   ON i.[object_id] = s.[object_id]
                      AND i.index_id = s.stats_id
WHERE o.[type] = 'U'
ORDER BY STATS_DATE(i.[object_id], i.index_id) ASC;  

When you run it you will find last statistics update date if it is too old it means you have to run the maintenance for those tables.

see below screenshot which I run on my machines adventureworks2012 database.

I am sure you will analyze your database tables stats and run maintenance accordingly.

I hope this tip may help you some where.

Enjoy !!!

Rj!!

3 different way to find row count of a table ? TIP #45

 

Problem:-

Many times you want to know how many rows exists in the particular tables.

So let me share 3 different way to know this thing

Solution:-

Let me share 3 different options

Option 1:-

You all aware of this term which is Count function

SELECT COUNT(1)  As Rows FROM [Person].[Person]

Option 2:-

Sp_Space used is another way to determine rows in table as shown in below figure

Option 3:-

it is little bit tricky but you will enjoy seeing this. We count the row number from cluster index

 

I hope you enjoyed.

Thanks & Enjoy !!!

RJ

How to determine Last statistics update? TIP #13

To determine last statistics update we need to run following command.

Go
SELECT o.name, i.name AS [Index Name], 
       STATS_DATE(i.[object_id], i.index_id) AS [Statistics Date],
       s.auto_created, s.no_recompute, s.user_created
FROM sys.objects AS o WITH (NOLOCK)
INNER JOIN sys.indexes AS i WITH (NOLOCK)
ON o.[object_id] = i.[object_id]
INNER JOIN sys.stats AS s WITH (NOLOCK)
ON i.[object_id] = s.[object_id]
AND i.index_id = s.stats_id
WHERE o.[type] = 'U'
ORDER BY STATS_DATE(i.[object_id], i.index_id) ASC;   
GO

OR

We can use following statement

Go
DBCC SHOW_STATISTICS ('users',PK_User);
GO



Enjoy !!!