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HomeHomeDevelopment and...Development and...SQL and SQL Ser...SQL and SQL Ser...how to empty Log filehow to empty Log file
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6/11/2014 3:47 AM
 
Ton Hermes


Joined: 1/6/2005
Posts: 608

Hi,

I use dnn722

My database is 41Mb
The database has an logfile.
This logfile is now big in size (91mb).
I have truncate the logfile on my server, however this does not shrinking this file.
When I perform a backup, then the logfile is not shrinking also.
- Is there any way I can empty this logfile?
- Does this logfile slow down the website?

Regards, Ton Hermes

Art is hard work, inspiration is the cream on top of it. See my watercolors at www.watermansite.com and my enamel art at www.watermanshop.com
 
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6/11/2014 4:15 AM
 
Sebastian Leupold


Sebastian Leupold's Avatar

Sebastian Leupold's Avatar

Sebastian Leupold's Avatar

Sebastian Leupold's Avatar

www.dnnwerk.de
Joined: 3/8/2004
Posts: 46212

91 MB is not too large for a log file - be aware that the transaction log is not only used to store all changes since last backup (in Full Backup mode), but also all open transactions. this might prevent the log to be truncated to the minimum size specified in database file settings, you would need to stop the app pool to close all connections first.

Regarding performance, the current size shouldn't be a big issue. You may also consider switching to Backup mode simple, if you don't mind to loose a few hours of changes since last backup in case you need to perform a restore.

Cheers from Germany,
Sebastian Leupold

dnnWerk - The DotNetNuke Experts   German Spoken DotNetNuke User Group

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6/12/2014 4:32 PM
 
cathal connolly


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www.cathal.co.uk
Joined: 4/9/2003
Posts: 9676
as Sebastian says, the log file may contain entries depending on the recovery model/current log state. However, log files are often mostly empty as sql assumes that it will likely need a similar amount of log space before the file is again truncated - you can use DBCC statements to shrink the file, but that is something you should only do when there is no activity as it will often block queries, see http://rusanu.com/2012/07/27/how-to-s... for more background and links to the relevant DBCC commands
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