Identify Large Tables

,

The script can be run as-is, and will produce a report on the size of all user tables in the currently selected database. When I find that I need to trim the fat in a database, this report will quickly show where I can gain the most immediately. For example, a large table at the top of the results might have been created for a temporary purpose and can now be dropped, or perhaps is ripe for archiving older rows to a partition devoted to historical data.

The output consists of table name, number of rows, and its physical size, in kilobytes (including unused space), ordered by largest size to smallest.

I reluctantly used cursors for this, working with the assumption that the number of user tables in the database should be relatively small (numbering in the hundreds, or thousands at most), so that cursor performance would not be a problem. As a future improvement, I'd like to possibly convert this to set-based logic.

Update 2/13/09 - Added 'TRUE' param to call to 'sp_spaceused' - this updates the tableusage to provide more accurate results - thanks to Doug (http://www.sqlservercentral.com/Forums/UserInfo437086.aspx). Also changed use of Sysobjects to INFORMATION_SCHEMA.TABLES

Jesse McLain

jesse@jessemclain.com

www.jessemclain.com

www.jessesql.blogspot.com

/*************************************************************************************************
**        File: Identify Large Tables.sql
**        Desc: Reports on physical size of tables in your database to identify largest.
**
**        Return values: result set
** 
**        Called by: 
** 
**        Parameters:
**        Input
**        ----------
**        none
**
**        Output
**        -----------
**        none
**
**        Auth: Jesse mcLain
**        Date: 01/31/2008
**
***************************************************************************************************
**        Change History
***************************************************************************************************
**        Date:        Author:                Description:
**        --------    --------            -------------------------------------------
**        20080131    Jesse McLain        Created script
**        20090213    Jesse McLain        Added 'TRUE' param to call to 'sp_spaceused' - this updates 
**                                        the tableusage to provide more accurate results - thanks to Doug
**                                        (http://www.sqlservercentral.com/Forums/UserInfo437086.aspx).
**                                        Also changed use of Sysobjects to INFORMATION_SCHEMA.TABLES
**************************************************************************************************/IF EXISTS(SELECT * FROM TempDb.dbo.SysObjects WHERE NAME = '##Space_Used') DROP TABLE ##Space_Used 

CREATE TABLE ##Space_Used (
    name nvarchar(128), 
    rows char(11), 
    reserved varchar(18), 
    data varchar(18), 
    index_size varchar(18), 
    unused varchar(18)
)

DECLARE @User_Table_Schema varchar(max)
DECLARE @User_Table_Name varchar(max)
DECLARE @User_Table_Name_with_Schema varchar(max)

DECLARE User_Tables_Cursor CURSOR FOR
SELECT Table_Schema, Table_Name
FROM INFORMATION_SCHEMA.TABLES
WHERE Table_Type = 'BASE TABLE'

OPEN User_Tables_Cursor 

FETCH NEXT FROM User_Tables_Cursor INTO @User_Table_Schema, @User_Table_Name 
WHILE @@FETCH_STATUS = 0
BEGIN
    SET @User_Table_Name_with_Schema = @User_Table_Schema + '.' + @User_Table_Name
PRINT @User_Table_Name_with_Schema 

    INSERT INTO ##Space_Used
    EXEC sp_spaceused @User_Table_Name_with_Schema, 'TRUE'

 FETCH NEXT FROM User_Tables_Cursor INTO @User_Table_Schema, @User_Table_Name 
END

CLOSE User_Tables_Cursor
DEALLOCATE User_Tables_Cursor

IF EXISTS(SELECT * FROM TempDb.dbo.SysObjects WHERE NAME = '##Space_Used2') DROP TABLE ##Space_Used2

SELECT 
    TableName=LEFT(Name, 50),
    "RowCount"=Rows,
    Phys_Size_KB = CONVERT(int, LEFT(Reserved, PATINDEX('% KB', Reserved) - 1))
FROM ##Space_Used
ORDER BY Phys_Size_KB DESC

IF EXISTS(SELECT * FROM TempDb.dbo.SysObjects WHERE NAME = '##Space_Used') DROP TABLE ##Space_Used

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