DROP STATISTICS (Transact-SQL)
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DROP STATISTICS (Transact-SQL)

 

Updated: March 22, 2016

THIS TOPIC APPLIES TO: yesSQL Server (starting with 2008)yesAzure SQL DatabaseyesAzure SQL Data Warehouse yesParallel Data Warehouse

Drops statistics for multiple collections within the specified tables in the current database.

Topic link icon Transact-SQL Syntax Conventions

-- Syntax for SQL Server and Azure SQL Database  
DROP STATISTICS table.statistics_name | view.statistics_name [ ,...n ]  

-- Syntax for Azure SQL Data Warehouse and Parallel Data Warehouse  
DROP STATISTICS [ schema_name . ] table_name.statistics_name   
[;]  

table | view
Is the name of the target table or indexed view for which statistics should be dropped. Table and view names must comply with the rules for Database Identifiers. Specifying the table or view owner name is optional.

statistics_name
Is the name of the statistics group to drop. Statistics names must comply with the rules for identifiers

Be careful when you drop statistics. Doing so may affect the execution plan chosen by the query optimizer.

Statistics on indexes cannot be dropped by using DROP STATISTICS. Statistics remain as long as the index exists.

For more information about displaying statistics, see DBCC SHOW_STATISTICS (Transact-SQL).

Requires ALTER permission on the table or view.

A. Dropping statistics from a table

The following example drops the statistics groups (collections) of two tables. The VendorCredit statistics group (collection) of the Vendor table and the CustomerTotal statistics (collection) of the SalesOrderHeader table are dropped.

-- Create the statistics groups.  
USE AdventureWorks2012;  
GO  
CREATE STATISTICS VendorCredit  
    ON Purchasing.Vendor (Name, CreditRating)  
    WITH SAMPLE 50 PERCENT  
CREATE STATISTICS CustomerTotal  
    ON Sales.SalesOrderHeader (CustomerID, TotalDue)  
    WITH FULLSCAN;  
GO  
DROP STATISTICS Purchasing.Vendor.VendorCredit, Sales.SalesOrderHeader.CustomerTotal;  
  

B. Dropping statistics from a table

The following examples drop the CustomerStats1 statistics from table Customer.

DROP STATISTICS Customer.CustomerStats1;  
DROP STATISTICS dbo.Customer.CustomerStats1;  
  

ALTER DATABASE (Transact-SQL)
CREATE INDEX (Transact-SQL)
CREATE STATISTICS (Transact-SQL)
sys.stats (Transact-SQL)
sys.stats_columns (Transact-SQL)
DBCC SHOW_STATISTICS (Transact-SQL)
sp_autostats (Transact-SQL)
sp_createstats (Transact-SQL)
UPDATE STATISTICS (Transact-SQL)
EVENTDATA (Transact-SQL)
USE (Transact-SQL)

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