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high transactions on our database

Posted on 2011-03-24
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Last Modified: 2012-05-11
I just received the following email from my hosting company.

I have 2 questions.

1) In general what would cause transaction logs being so high
2) what are the effects of being in simple recovery model.

"Can i ask precisely what you're doing with the xxxx database at present ?

Yesterday some 77GB of transaction logs were generated, today has been 10GB - which is more than all the other databases on the server !

To ensure this database doesn't affect other users on the server, i've had to set your database to use a simple recovery model..."
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Question by:frosty1
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lcohan earned 500 total points
ID: 35208319
1. Insert/update/deletes are all logged transactions in SQL plust other operations like some DDL changes and a re-index for instance.

2. Setting database to Simple recovery will reduce somewhat transaction logging however this may impact your disaster recovery/point in time restore/log shipping capabilities.

http://msdn.microsoft.com/en-us/library/ms189275.aspx
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by:Todar
ID: 35208354
The log is so large because backups are not scheduled to run on it or not often enough.
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by:jimtpowers
ID: 35208458
When my logs fail to back up, they will grow uncontrollably. Just last week, rights on the backup server were modified and I didn't catch it until the next day. The logs consumed the entire log drive, an extra 150 GB in 18 hours. Once I discovered the problem, I had to do a full backup and then another transaction log backup before I was able to shrink the log file back down to the appropriate size.

I believe @Todar is correct in that your hosting company is not backing up the logs frequently enough to keep them small. As @Icohan indicated, simply recovery will prevent restoring to a point in time other than your full backup.
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by:lcohan
ID: 35209379
Backing up the db's and t-logs should not be left for the hosting company to do but the owner of the database business rules should drive the backup/restore from disaster recovery point of view nut just regular maintenance. Backing up regularely the T-Logs will reduce the amount of disk space the T-logs are taking and indeed keep that under control but will NOT eliminate excessive logging. For that you may need to do a code review and eliminate unnecessary transactions that are filling up your t-logs.
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