on August 27, 2009
Sometimes tempdb is filling up. Sometimes I just want to monitor the amount of tempdb and check out execution plans of heavy tempdb users while watching performance on a server.
This script comes in handy more frequently than I would have thought before I started using it.
- This script returns space used in tempdb only, regardless of the db context it’s run in, and it only works for tempdb
- I adapted this from the SQL Server Storage Engine Blog.
select
t1.session_id
, t1.request_id
, task_alloc_GB = cast((t1.task_alloc_pages * 8./1024./1024.) as numeric(10,1))
, task_dealloc_GB = cast((t1.task_dealloc_pages * 8./1024./1024.) as numeric(10,1))
, host= case when t1.session_id <= 50 then 'SYS' else s1.host_name end
, s1.login_name
, s1.status
, s1.last_request_start_time
, s1.last_request_end_time
, s1.row_count
, s1.transaction_isolation_level
, query_text=
coalesce((SELECT SUBSTRING(text, t2.statement_start_offset/2 + 1,
(CASE WHEN statement_end_offset = -1
THEN LEN(CONVERT(nvarchar(max),text)) * 2
ELSE statement_end_offset
END - t2.statement_start_offset)/2)
FROM sys.dm_exec_sql_text(t2.sql_handle)) , 'Not currently executing')
, query_plan=(SELECT query_plan from sys.dm_exec_query_plan(t2.plan_handle))
from
(Select session_id, request_id
, task_alloc_pages=sum(internal_objects_alloc_page_count + user_objects_alloc_page_count)
, task_dealloc_pages = sum (internal_objects_dealloc_page_count + user_objects_dealloc_page_count)
from sys.dm_db_task_space_usage
group by session_id, request_id) as t1
left join sys.dm_exec_requests as t2 on
t1.session_id = t2.session_id
and t1.request_id = t2.request_id
left join sys.dm_exec_sessions as s1 on
t1.session_id=s1.session_id
where
t1.session_id > 50 -- ignore system unless you suspect there's a problem there
and t1.session_id <> @@SPID -- ignore this request itself
order by t1.task_alloc_pages DESC;
GO
REGISTER