檢視連線當前資料庫的spid所加的鎖
set transaction isolation level read uncommitted
select db_name(resource_database_id) as databasename
, request_session_id
, resource_type
, case
when resource_type = 'object'
then object_name(resource_associated_entity_id)
when resource_type in ('key', 'page', 'rid')
then (select object_name(object_id)
from sys.partitions p
where p.hobt_id = l.resource_associated_entity_id)
end as resource_type_name
, request_status
, request_mode
from sys.dm_tran_locks l
where request_session_id !=@@spid
order by request_session_id
結果如圖:
檢視沒關閉事務的空閒session
檢視被阻塞的語句和它們的等待時間
檢視超過30秒等待的查詢
buffer中快取每個資料庫所佔的buffer
set tran isolation level read uncommitted
select
isnull(db_name(database_id), 'resourcedb') as databasename
, cast(count(row_count) * 8.0 / (1024.0) as decimal(28,2))
as [size (mb)]
from sys.dm_os_buffer_descriptors
group by database_id
order by databasename
結果如圖:
當前資料庫中每個表所佔快取的大小和頁數
set transaction isolation level read uncommitted
select
object_name(p.[object_id]) as [tablename]
, (count(*) * 8) / 1024 as [buffer size(mb)]
, isnull(i.name, '-- heap --') as objectname
, count(*) as numberof8kpages
from sys.allocation_units as a
inner join sys.dm_os_buffer_descriptors as b
on a.allocation_unit_id = b.allocation_unit_id
inner join sys.partitions as p
inner join sys.indexes i on p.index_id = i.index_id
and p.[object_id] = i.[object_id]
on a.container_id = p.hobt_id
where b.database_id = db_id()
and p.[object_id] > 100
group by p.[object_id], i.name
order by numberof8kpages desc
結果如下:
資料庫級別等待的io
set tran isolation level read uncommitted
select db_name(database_id) as [databasename]
, sum(cast(io_stall / 1000.0 as decimal(20,2))) as [io stall (secs)]
, sum(cast(num_of_bytes_read / 1024.0 / 1024.0 as decimal(20,2)))
as [io read (mb)
, sum(cast(num_of_bytes_written / 1024.0 / 1024.0 as decimal(20,2)))
as [io written (mb)
, sum(cast((num_of_bytes_read + num_of_bytes_written)
/ 1024.0 / 1024.0 as decimal(20,2))) as [totalio (mb)
from sys.dm_io_virtual_file_stats(null, null)
group by database_id
order by [io stall (secs)] desc
結果如下:
按檔案檢視io情況
set tran isolation level read uncommitted
select db_name(database_id) as [databasename]
, file_id
, sum(cast(io_stall / 1000.0 as decimal(20,2))) as [io stall (secs)]
, sum(cast(num_of_bytes_read / 1024.0 / 1024.0 as decimal(20,2)))
as [io read (mb)]
, sum(cast(num_of_bytes_written / 1024.0 / 1024.0 as decimal(20,2)))
as [io written (mb)]
, sum(cast((num_of_bytes_read + num_of_bytes_written)
/ 1024.0 / 1024.0 as decimal(20,2))) as [totalio (mb)]
from sys.dm_io_virtual_file_stats(null, null)
group by database_id, file_id
order by [io stall (secs)] desc
結果如下:
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