1. To check the available disk space, you may use the undocumented system extended stored procedure xp_fixeddrives, which can return the available free space (MB) for each fixed drive. You can run it as follows:
Exec master.dbo.xp_fixeddrives
2. As for the database data file and transaction log space allocation and utilization, you may use the following query to query this:
1) You may check the file size (in MB) by query the sysfiles table as follows:
select name, convert(float,size) * (8192.0/1024.0)/1024. from dbo.sysfiles
2) To check the utilization, you may use sp_spaceused:
Exec sp_spaceused
The database_size column is the sum of data files and log files, and the "unallocated space" column is the total unallocated space in the database.
To check the log file's utilization, you may use:
DBCC SQLPERF(LOGSPACE)
For more information regarding the sysfiles table, dbcc sqlperf(logspace) and sp_spaceused, please refer to SQL Server Books Online.
In fact, you can view the similar information in SQL Enterprise Manager: in Enterprise Manager, right click the database, click View -> Taskpad, then you can see the data and log files size and utilization at the right
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