Determining how much of your data file has been modified
SQL Server 2017 introduces a new column in the sys.dm_db_file_space_usage system table. The column is modified_extent_page_count, which tells how many pages have been modified in your data file since the last full backup. What is really interesting about this is that with a little math you can calculate the percentage of your data file that has been modified. This would be useful …
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