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Backup size


Backup size

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Krasavita
Krasavita
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Hello,

Before I run backup,can I check how big it will be?

Thank you
GSquared
GSquared
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Not really. You can get a general idea, in that it's usually smaller than the database (assuming free space in the data and log files).

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Alan Burstein
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This will tell you the minimum size (the size of your MDF and NDF files). The backup, unless compressed, will never be less than this.


USE {myDB};

SELECT SUM(size/128) AS mb FROM sys.database_files WHERE type = 0



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GilaMonster
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Actually it probably will be.

That query returns the total size of the DB files. A backup does not back up the entire file, just the used portion of it. So if you have a 10GB database that's only 50% allocated, the backup will (ignoring contribution from the log) be around 5GB in size.



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Alan Burstein
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GilaMonster (8/20/2012)
Actually it probably will be.

That query returns the total size of the DB files. A backup does not back up the entire file, just the used portion of it. So....


Good catch. Did not think about unused space. Blush

-- Alan Burstein


Helpful links:

Best practices for getting help on SQLServerCentral -- Jeff Moden
How to Post Performance Problems -- Gail Shaw

Nasty fast set-based string manipulation functions:
For splitting strings try DelimitedSplit8K or DelimitedSplit8K_LEAD (SQL Server 2012+)
To split strings based on patterns try PatternSplitCM
Need to clean or transform a string? try NGrams, PatExclude8K, PatReplace8K, DigitsOnlyEE, or Translate8K

I cant stress enough the importance of switching from a sequential files mindset to set-based thinking. After you make the switch, you can spend your time tuning and optimizing your queries instead of maintaining lengthy, poor-performing code. -- Itzik Ben-Gan 2001

SQL Show
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Use dbname
Go
Select count(Total_pages), count(used_pages) , sum( total_pages* 8) TotalPagesKb, sum(used_pages * 8 ) Usedpageskb from sys.allocation_units


I am not sure above query will help you 100%, but you may get an idea about of your backup size will be.
Go


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