In this post, I am building a script to execute Update Statistics (sp_updatestats) for all SQL Server Databases.

DBA set auto update statistics to ON, but then also some times DBA has to execute sp_updatestats for updating the Database Statistics.

When high volumes of data processing, Auto update option skips updating the database statistics so DBA has to update database statistics in a maintenance window.

SQL Server: Enable Auto Create and Auto Update Statistics

DBA can use below script to execute sp_updatestats for all databases:

DECLARE @SQL VARCHAR(1000)  
DECLARE @DBName sysname  

DECLARE DBcur CURSOR FORWARD_ONLY STATIC FOR  
SELECT [name]  
FROM master..sysdatabases 
WHERE [name] NOT IN ('master','model', 'tempdb') 
ORDER BY [name] 
     
OPEN DBcur  
FETCH NEXT FROM DBcur INTO @DBName  
WHILE @@FETCH_STATUS = 0  
   BEGIN  
       SELECT @SQL = 'USE [' + @DBName +']' + CHAR(13) + 'EXEC sp_updatestats' + CHAR(13)  
       PRINT @SQL  
       FETCH NEXT FROM DBcur INTO @DBName  
   END      
CLOSE DBcur  
DEALLOCATE DBcur

In this post, I am sharing scripts to update a statistic of an individual object or all the objects in SQL Server.

In the query execution process, Query Optimizer uses a statistic of objects to get different information like: number of actual rows, index information, data change count and others.
The database statistic helps to the Query Optimizer in choosing a best execution plan for query processing.

Why object statistic should be updated?

The Query Optimer choose an execution plan accordingly statistical data.
For example, Your table has an actual row count is 100000 and imagine that statistic object is not updated and has only a 50000 row count, so with this situation, it may be selects a wrong execution plan.

To update a Statistic of Tables and Indexes is also one type of maintenance task for DBA and it should be performed periodically.

Update all statistic of a Database:

EXEC sp_updatestats;

UPDATE STATISTICS Table_Name

UPDATE STATISTICS Table_Name Index_Name