SQL Defrag
I am working with a very large reporting Database (3-4TB) that has nightly ETLs running. We also have a high percentage of fragmentation. I want to defrag the database, but due to the size of the database and the time it will probably take I will need to do this online and may not necessarily be able to run outside of business hours. Which method would least affect end users, backups, and ETLs? Should I just Reorganize, or can I Rebuild with Online parameter?
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You need to defrag by object. Chose only the tables with more than 30% fragmentation and rebuild those.
For fragmentation level between 10%-30% it's better to reorganize.
Don't do nothing with tables with less than 10% of fragmentation.
If you do this by groups then you can split all the heavy work during the week or month depending on the available maintenance window.