有关锁和内存使用的DMV
查看连接当前数据库的SPID所加的锁
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
结果如图:
如果像查看更多的锁，调整where条件即可
查看没关闭事务的空闲Session
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SELECT es.session_id, es.login_name, es.host_name, est.text
, cn.last_read, cn.last_write, es.program_name
FROM sys.dm_exec_sessions es
INNER JOIN sys.dm_tran_session_transactions st
ON es.session_id = st.session_id
INNER JOIN sys.dm_exec_connections cn
ON es.session_id = cn.session_id
CROSS APPLY sys.dm_exec_sql_text(cn.most_recent_sql_handle) est
LEFT OUTER JOIN sys.dm_exec_requests er
ON st.session_id = er.session_id
AND er.session_id IS NULL
查看被阻塞的语句和它们的等待时间
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SELECT
Waits.wait_duration_ms / 1000 AS WaitInSeconds
, Blocking.session_id as BlockingSessionId
, DB_NAME(Blocked.database_id) AS DatabaseName
, Sess.login_name AS BlockingUser
, Sess.host_name AS BlockingLocation
, BlockingSQL.text AS BlockingSQL
, Blocked.session_id AS BlockedSessionId
, BlockedSess.login_name AS BlockedUser
, BlockedSess.host_name AS BlockedLocation
, BlockedSQL.text AS BlockedSQL
, SUBSTRING (BlockedSQL.text, (BlockedReq.statement_start_offset/2) + 1,
((CASE WHEN BlockedReq.statement_end_offset = -1
THEN LEN(CONVERT(NVARCHAR(MAX), BlockedSQL.text)) * 2
ELSE BlockedReq.statement_end_offset
END - BlockedReq.statement_start_offset)/2) + 1)
AS [Blocked Individual Query]
, Waits.wait_type
FROM sys.dm_exec_connections AS Blocking
INNER JOIN sys.dm_exec_requests AS Blocked
ON Blocking.session_id = Blocked.blocking_session_id
INNER JOIN sys.dm_exec_sessions Sess
ON Blocking.session_id = sess.session_id
INNER JOIN sys.dm_tran_session_transactions st
ON Blocking.session_id = st.session_id
LEFT OUTER JOIN sys.dm_exec_requests er
ON st.session_id = er.session_id
AND er.session_id IS NULL
INNER JOIN sys.dm_os_waiting_tasks AS Waits
ON Blocked.session_id = Waits.session_id
CROSS APPLY sys.dm_exec_sql_text(Blocking.most_recent_sql_handle)
AS BlockingSQL
INNER JOIN sys.dm_exec_requests AS BlockedReq
ON Waits.session_id = BlockedReq.session_id
INNER JOIN sys.dm_exec_sessions AS BlockedSess
ON Waits.session_id = BlockedSess.session_id
CROSS APPLY sys.dm_exec_sql_text(Blocked.sql_handle) AS BlockedSQL
ORDER BY WaitInSeconds
查看超过30秒等待的查询
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SELECT
Waits.wait_duration_ms / 1000 AS WaitInSeconds
, Blocking.session_id as BlockingSessionId
, Sess.login_name AS BlockingUser
, Sess.host_name AS BlockingLocation
, BlockingSQL.text AS BlockingSQL
, Blocked.session_id AS BlockedSessionId
, BlockedSess.login_name AS BlockedUser
, BlockedSess.host_name AS BlockedLocation
, BlockedSQL.text AS BlockedSQL
, DB_NAME(Blocked.database_id) AS DatabaseName
FROM sys.dm_exec_connections AS Blocking
INNER JOIN sys.dm_exec_requests AS Blocked
ON Blocking.session_id = Blocked.blocking_session_id
INNER JOIN sys.dm_exec_sessions Sess
ON Blocking.session_id = sess.session_id
INNER JOIN sys.dm_tran_session_transactions st
ON Blocking.session_id = st.session_id
LEFT OUTER JOIN sys.dm_exec_requests er
ON st.session_id = er.session_id
AND er.session_id IS NULL
INNER JOIN sys.dm_os_waiting_tasks AS Waits
ON Blocked.session_id = Waits.session_id
CROSS APPLY sys.dm_exec_sql_text(Blocking.most_recent_sql_handle)
AS BlockingSQL
INNER JOIN sys.dm_exec_requests AS BlockedReq
ON Waits.session_id = BlockedReq.session_id
INNER JOIN sys.dm_exec_sessions AS BlockedSess
ON Waits.session_id = BlockedSess.session_id
CROSS APPLY sys.dm_exec_sql_text(Blocked.sql_handle) AS BlockedSQL
WHERE Waits.wait_duration_ms > 30000
ORDER BY WaitInSeconds
buffer中缓存每个数据库所占的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
结果如图:
当前数据库中每个表所占缓存的大小和页数
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
结果如下:
数据库级别等待的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
结果如下:
按文件查看IO情况
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
结果如下:
