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I migrated a SQL Server database (source) into a SQL Server Express database (destiny). Used “generate scripts…” in SSMS.
I verified if the tables (tested with the 3 biggest tables) in the source DB had the same number of rows has the Express and all looked OK.
I executed sp_spaceused and found that the original database size is 16MB, while the Express version is 4MB.
Does the Express DB uses less space or is this a sign that something went wrong with the migration?
Thank you
The reason is simple. When you migrated data, you are doing a very clean, ordered insert. There is no junk data, no removed records, no empty unused pages etc.
Also, if you have ever dropped columns (containing data) from the original database, the data is not removed, just marked as unusable – that again takes up space.
Shrinking the database will recover some space, if you include the move data pages option, it will even pack the data further. But do check for dropped columns and rebuild those tables.
http://www.simple-talk.com/community/blogs/andras/archive/2009/02/19/72068.aspx