dbcc sqlperf(logspace)    --各数据库日志大小及使用百分比dbcc loginfo    --查看当前数据库的虚拟日志文件--临时表'Tempdb'最近使用情况
SELECT t1.session_id
,t1.internal_objects_alloc_page_count*8.0/1024 as internal_objects_alloc_MB
,t1.internal_objects_dealloc_page_count *8.0/1024 as internal_objects_dealloc_MB
,t1.user_objects_alloc_page_count*8.0/1024 as user_objects_alloc_MB
,t1.user_objects_dealloc_page_count*8.0/1024 as user_objects_dealloc_MB
,t3.login_name,t3.status,t3.total_elapsed_time
from sys.dm_db_session_space_usage  t1
inner join sys.dm_exec_sessions as t3
on t1.session_id = t3.session_id
where (t1.internal_objects_alloc_page_count>0
or t1.user_objects_alloc_page_count >0
or t1.internal_objects_dealloc_page_count>0
or t1.user_objects_dealloc_page_count>0)
ORDER BY internal_objects_alloc_page_count DESC--'Tempdb'存储对象使用情况
Select 'Tempdb' as DB, getdate() as Time,                                                        SUM (user_object_reserved_page_count)*8 as user_objects_kb,          SUM (internal_object_reserved_page_count)*8 as internal_objects_kb,  SUM (version_store_reserved_page_count)*8  as version_store_kb,      SUM (unallocated_extent_page_count)*8 as freespace_kb
From sys.dm_db_file_space_usage
Where database_id = 2  --使用计数器(SQLServer:Transactions )监视 tempdb 中行版本存储区的大小和增长速率
SELECT * FROM sys.dm_os_performance_counters
where counter_name='Free Space in tempdb (KB)'
or counter_name='Version Store Size (KB)'  --tempdb大小和增长速率
SELECT   name AS FileName,   size*1.0/128 AS FileSizeinMB,  CASE max_size   WHEN 0 THEN 'Autogrowth is off.'  WHEN -1 THEN 'Autogrowth is on.'  ELSE 'Log file will grow to a maximum size of 2 TB.'  END,  growth AS 'GrowthValue',  'GrowthIncrement' =   CASE  WHEN growth = 0 THEN 'Size is fixed and will not grow.'  WHEN growth > 0 AND is_percent_growth = 0   THEN 'Growth value is in 8-KB pages.'  ELSE 'Growth value is a percentage.'  END
FROM tempdb.sys.database_files;
GO