Why did the size of the mdf file grow when indexes were rebuilt?

Question

SQL Server

Database size before operation ~4 GB
Rebuilt indexes on all database tables with the command:

ALTER INDEX ALL ON @TableName REBUILD WITH (FILLFACTOR = 10, SORT_IN_TEMPDB = ON)

The size of the mdf file has grown four times, if you run the operation again, the size continues to grow, although the indexes have already been rebuilt. With what it can be connected? Is it possible to avoid it?
When rebuilding indexes on "thick" tables, the size does not grow through the SQL Management Studio interface.

Answer 1

все это дело повязано с опцией FILLFACTOR, глянте чего там MSSMS отправляет на сервер и можно почитать про описание коэффициента заполнения