Will Log Backup cause issue?

Hi Experts,
we have been getting complaints from application users about slowness on and off. tried all the ways, no clues. finally, one business user is helping me with the exact timings of slowness in the application. the trend is exactly at the time of log backup
happening time. log backups are completing in less 30 sec. even the slowness is only at that time.
Now I didn't understand, will log backups cause slowness to the databases access? I believe, full backups will cause a bit.
please help.
thanks in advance
Vinod Mallolu
Cheers, Vinod Mallolu

Hi Vinod,
It really depends on I/O subsystem and your server configuration. For example:
Poorly performing I/O subsystem can cause poor during log backups.
Poor performance can occur if your database log drive is same as your backup drive. If you are using SAN then make sure that both drives are not commissioned from same LUN.
Transaction Log activity and the size of your log files. If your database is highly transactional database than you should experience some slowness if you are performing Log backups. If you are using SQL Server 2012 or about with Enterprise edition and
have standby server than use Availability Groups to offload your transaction log backups.
Increasing the frequency of log backup also helps.
I hope this information is useful for you to rectify the issue.
Regards,
Basit A. Farooq (MSC Computing, MCITP SQL Server 2005 & 2008, MCDBA SQL Server 2000)
http://basitaalishan.com
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"Unmark as Answer" if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

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