-查询某个数据库的连接数
select count(*) from Master.dbo.SysProcesses where dbid=db_id()
--前10名其他等待类型
SELECT TOP 10 * from sys.dm_os_wait_stats
ORDER BY wait_time_ms DESC
SELECT *FROM sys.dm_os_wait_stats WHERE wait_type like 'PAGELATCH%'
OR wait_type like 'LAZYWRITER_SLEEP%'
--CPU的压力
SELECT scheduler_id, current_tasks_count, runnable_tasks_count
FROM sys.dm_os_schedulers
WHERE scheduler_id < 255
--表现最差的前10名使用查询
SELECT TOP 10 ProcedureName = t.text,
ExecutionCount = s.execution_count,
AvgExecutionTime = isnull ( s.total_elapsed_time / s.execution_count, 0 ),
AvgWorkerTime = s.total_worker_time / s.execution_count,
TotalWorkerTime = s.total_worker_time,
MaxLogicalReads = s.max_logical_reads,
MaxPhysicalReads = s.max_physical_reads,
MaxLogicalWrites = s.max_logical_writes,
CreationDateTime = s.creation_time,
CallsPerSecond = isnull ( s.execution_count / datediff ( second , s.creation_time, getdate ()), 0 )
FROM sys.dm_exec_query_stats s
CROSS APPLY sys.dm_exec_sql_text( s.sql_handle ) t ORDER BY
s.max_physical_reads DESC
--一个信号等待时间过多对资源的等待时间那么你的CPU是目前的一个瓶颈。
SELECT SUM(signal_wait_time_ms) AS total_signal_wait_time_ms总信号等待时间 ,
SUM(wait_time_ms - signal_wait_time_ms) AS resource_wait_time_ms资源的等待时间,
SUM(signal_wait_time_ms) * 1.0 / SUM (wait_time_ms) * 100 AS [signal_wait_percent信号等待％],
SUM(wait_time_ms - signal_wait_time_ms) * 1.0 / SUM (wait_time_ms) * 100 AS [resource_wait_percent资源等待％]
FROM sys.dm_os_wait_stats
--查看进程所执行的SQL语句
if (select COUNT(*) from master.dbo.sysprocesses) > 500
begin
select text,CROSS APPLY master.sys.dm_exec_sql_text(a.sql_handle) from master.sys.sysprocesses a
end
select text,a.* from master.sys.sysprocesses a
CROSS APPLY master.sys.dm_exec_sql_text(a.sql_handle)
where a.spid = '51'
dbcc inputbuffer(53)
with tb
as
(
select blocking_session_id,
session_id,db_name(database_id) as dbname,text from master.sys.dm_exec_requests a
CROSS APPLY master.sys.dm_exec_sql_text(a.sql_handle)
),
tb1 as
(
select a.,login_time,program_name,client_interface_name,login_name,cpu_time,memory_usage8 as 'memory_usage(KB)',
total_scheduled_time,reads,writes,logical_reads
from tb a inner join master.sys.dm_exec_sessions b
on a.session_id=b.session_id
)
select a.*,connect_time,client_tcp_port,client_net_address from tb1 a inner join master.sys.dm_exec_connections b on a.session_id=b.session_id
--当前进程数
select * from master.dbo.sysprocesses
order by cpu desc
--查看当前活动的进程数
