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When SQL Server does an online hot backup, users can continue normal transaction activity. During the backup operation, updates are logged within SQL Server's transaction log. Reduced database performance is the most likely issue when backing up SQL Server while the database is online and being used actively.
The degree of impact will depend on the power of your server hardware (CPU, memory, etc), speed of your backup infrastructure and the volume of transactions hitting the database. If you have a very busy SQL Server, you will have to ensure that your infrastructure is tailored to handle the high volume of transactions while it is also being backed up in order to provide response times that are up to your users' expectations.
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How to plan a records retention program?
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