SQL process, percentage of complete

I restore one database and want know how many percent the SQL process will be complete?

Step
1. Restore database test from disk='c:\test.mdf'
2. We can check which session belong to this process with running the below command
sp_who2 'active'
3. Check on command column, and look for "Restore database"
My SPID for this "Restore database" = 57
4. Run the below command and look for session_id=57

Select session_id,percent_complete,estimated_completion_time,total_elapsed_time
From sys.dm_exec_requests
Where session_id=57

session_id percent_complete estimated_completion_time total_elapsed_time
---------- ---------------- ------------------------- ------------------
57 26.47547 5800366 2090266

The above result show the SQL process already complete 26.47%, estimated_completion_time=5800366 and total_elapsed_time=2090266

This above example is use to show how to use sys.dm_exec_requests to show how many percent_complete of SQL process.
We can also run the below command to show percentage complete of restore process.

Restore database test from disk='c:\test.mdf' with stats
10 percent processed.
20 percent processed.
30 percent processed.
....