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Estimating the Size of an Index

If you’re creating a new index in SQL Server, it is good practice to make sure you have enough space on your drive to do so. You’ll not only need the space to hold it, but double the space as SQL Server builds it on temporary disk space. ( So if your index is going to be 1 GB, then you will need up to 2 GB to make it. By the way, when rebuilding, you’ll need triple the space, as SQL Server also retains the old index while it creates a new one.

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