Sql-server – How to monitor Database usage

If anyone's curious, I ended up doing this. It gives me something, but I'm not really convinced that the data is good enough to be better than no data.

-- Set up table
-- Put this somewhere other than TempDB if you want it to persist across restarts
USE TempDB
DROP TABLE Sessions
CREATE TABLE Sessions (last_request_end_time datetime, login_name varchar(100), reads int,  
writes int, cpu_time bigint)

-- Insert info about sessions from sys.dm_exec_sessions
INSERT INTO Sessions (last_request_end_time, login_name, reads, writes, cpu_time)
SELECT last_request_end_time, login_name, reads, writes, cpu_time 
FROM sys.dm_exec_sessions

/* 
In a loop, every 100ms insert data from sys.dm_exec_sessions where
last_request_end_time is greater than what has already been written
to the sessions table. 

This data will be inaccurate in that very short-lived
sessions might never get counted, and long-running sessions will get 
activity counted multiple times. As a result, you might get very different results
depending on what the WAITFOR delay is set to.

Optionally run this part as an Agent job.
*/

WHILE (2 > 1)
BEGIN
INSERT INTO Sessions (last_request_end_time, login_name, reads, writes, cpu_time)
SELECT last_request_end_time, login_name, reads, writes, cpu_time 
FROM sys.dm_exec_sessions 
WHERE last_request_end_time > (SELECT MAX(last_request_end_time) FROM Sessions)
WAITFOR DELAY '00:00:00.100';
END

-- After exiting the loop (stop Agent job, manually abort, etc) report on results
SELECT login_name, 
SUM(reads) AS reads, 
SUM(writes) AS writes, 
SUM(cpu_time) AS cpu_time, 
COUNT (login_name) AS session_count
FROM TempDB.dbo.Sessions 
GROUP BY login_name

Here is some old code I wrote for SQL 2000. It still works on SQL 2005. You can use this to come up with a rough estimate of how much space you are using per document, then multiply that by your estimated number of documents.

   select 'CatalogName'   = left([name],30),
          'Status'        = case(FULLTEXTCATALOGPROPERTY ([name],'populatestatus'))
                              when 0 then 'Idle'
                              when 1 then 'Full population in progress'
                              when 2 then 'Paused'
                              when 3 then 'Throttled'
                              when 4 then 'Recovering'
                              when 5 then 'Shutdown'
                              when 6 then 'Incremental population in progress'
                              when 7 then 'Building index'
                              when 8 then 'Disk is full.  Paused.'
                              when 9 then 'Change tracking'
                              else 'Unknown'       
                            end,
          'ItemCount'     = FULLTEXTCATALOGPROPERTY (name,'itemcount'),
          'IndexSize(MB)' = FULLTEXTCATALOGPROPERTY (name,'indexsize'),
          'UniqueWords'   = FULLTEXTCATALOGPROPERTY (name,'uniquekeycount'),
          'ErrorLogBytes' = FULLTEXTCATALOGPROPERTY (name,'logsize'),
          'Location'      = left(s.path,50) 
   from sysfulltextcatalogs s