Query to display Backup compression

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Query to display Backup compression

Author

Topic

ProgressBoy
Starting Member

14 Posts

Posted - 2012-07-07 : 19:14:48

I have a query from msdb..backupset that displays Database Name and Compression Ratio, but it displays multiple records for every database/backup. I just want one record for latest backup of the database.

If I specify Max(b.backup_finish_date) I have to group by Compression Ratio, that aggregates Compression Ratio number and is not what I want.

SELECT
b.database_name 'Database Name',

CONVERT (NUMERIC (20,2), (CONVERT (FLOAT, b.backup_size) /
CONVERT (FLOAT, b.compressed_backup_size))) 'Compression Ratio'

FROM
msdb.dbo.backupset b
WHERE
DATEDIFF (SECOND, b.backup_start_date, b.backup_finish_date) > 0
AND b.backup_size > 0
and b.type = 'd'
ORDER BY
b.database_name

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2012-07-07 : 20:32:28

may be this is what you want


;With CTE
AS
(
SELECT 
b.database_name 'Database Name', 

CONVERT (NUMERIC (20,2), (CONVERT (FLOAT, b.backup_size) / 
CONVERT (FLOAT, b.compressed_backup_size))) 'Compression Ratio',
DATEDIFF (SECOND, b.backup_start_date, b.backup_finish_date) AS Duration,
ROW_NUMBER() OVER (PARTITION BY [Database Name] ORDER BY DATEDIFF (SECOND, b.backup_start_date, b.backup_finish_date) DESC) AS Seq
FROM 
msdb.dbo.backupset b 
WHERE 
DATEDIFF (SECOND, b.backup_start_date, b.backup_finish_date) > 0 
AND b.backup_size > 0 
and b.type = 'd'
)

SELECT *
FROM CTE
WHERE Seq=1
ORDER BY 
[Database Name]

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

ProgressBoy
Starting Member

14 Posts

Posted - 2012-07-08 : 10:20:04

very nice, thank you. Great use of the Row_NUmber () with Partition By

Thanks!!

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2012-07-08 : 16:07:07

welcome

------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/

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