/* 连接数 */
select connectnum=count(distinct net_address)-1 from master..sysprocesses
/* 返回一组有关计算机和有关 SQL Server 可用资源及其已占用资源的有用杂项信息 */
select * from sys.dm_os_sys_info
/* 从操作系统返回内存信息 */
select * from sys.dm_os_sys_memory
/* 返回有关调用进程的虚拟地址空间中的页范围的信息 */
select * from sys.dm_os_virtual_address_dump
/* 命令提供了SQL Server的当前内存状态的快照，也可以作为我们分析内存瓶颈的重要依据 */
DBCC MemoryStatus
/* 计数器视图，主要对缓冲区管理器和内存管理器的一些计数器进行监控，比如页面的生存周期、检查点、惰性写入器和缓冲命中率等指标 */
select * from sys.dm_os_performance_counters
/* 缓冲池内数据库缓冲池中各个数据库的分布情况 */
select case database_id when 32767 then 'resourceDb' else db_name(database_id) end as database_name,count(*) as cached_pages_count from sys.dm_os_buffer_descriptors group by db_name(database_id),database_id order by cached_pages_count desc;
/* 返回数据和日志文件的 I/O 统计信息 */
select * from sys.dm_io_virtual_file_stats(null,null)
/* 当前缓存的哪些批处理或过程占用了大部分 CPU 资源 */
SELECT TOP 50 SUM(qs.total_worker_time) AS total_cpu_time, SUM(qs.execution_count) AS total_execution_count, COUNT(*) AS number_of_statements, qs.sql_handle FROM sys.dm_exec_query_stats AS qs GROUP BY qs.sql_handle ORDER BY SUM(qs.total_worker_time) DESC
/* 缓存计划所占用的 CPU 总使用率 */
SELECT total_cpu_time, total_execution_count, number_of_statements, s2.text --(SELECT SUBSTRING(s2.text, statement_start_offset / 2, ((CASE WHEN statement_end_offset = -1 THEN (LEN(CONVERT(NVARCHAR(MAX), s2.text)) * 2) ELSE statement_end_offset END) - statement_start_offset) / 2) ) AS query_text FROM (SELECT TOP 50 SUM(qs.total_worker_time) AS total_cpu_time, SUM(qs.execution_count) AS total_execution_count, COUNT(*) AS number_of_statements, qs.sql_handle --, --MIN(statement_start_offset) AS statement_start_offset, --MAX(statement_end_offset) AS statement_end_offset FROM sys.dm_exec_query_stats AS qs GROUP BY qs.sql_handle ORDER BY SUM(qs.total_worker_time) DESC) AS stats CROSS APPLY sys.dm_exec_sql_text(stats.sql_handle) AS s2
/* CPU 平均占用率最高的前 50 个 SQL 语句 */
SELECT TOP 50 total_worker_time/execution_count AS [Avg CPU Time], (SELECT SUBSTRING(text,statement_start_offset/2,(CASE WHEN statement_end_offset = -1 then LEN(CONVERT(nvarchar(max), text)) * 2 ELSE statement_end_offset end -statement_start_offset)/2) FROM sys.dm_exec_sql_text(sql_handle)) AS query_text, * FROM sys.dm_exec_query_stats ORDER BY [Avg CPU Time] DESC
/* 查看 CPU、计划程序内存和缓冲池信息 */
select cpu_count, hyperthread_ratio, scheduler_count, physical_memory_in_bytes / 1024 / 1024 as physical_memory_mb, virtual_memory_in_bytes / 1024 / 1024 as virtual_memory_mb, bpool_committed * 8 / 1024 as bpool_committed_mb, bpool_commit_target * 8 / 1024 as bpool_target_mb, bpool_visible * 8 / 1024 as bpool_visible_mb from sys.dm_os_sys_info
/* 查询显示 SQL 等待分析和前 10 个等待的资源 */
select top 10 * from sys.dm_os_wait_stats --where wait_type not in ('CLR_SEMAPHORE','LAZYWRITER_SLEEP','RESOURCE_QUEUE','SLEEP_TASK','SLEEP_SYSTEMTASK','WAITFOR') order by wait_time_ms desc
/* 计算可运行状态下的工作进程数量，来观察CPU压力 */
SELECT COUNT( * ) as workers_waiting_for_cpu FROM sys.dm_os_workers WHERE o.state = 'RUNNABLE' GROUP BY s.scheduler_id
/* 检查闩锁等待统计信息以确定 I/O 瓶颈 */
select wait_type, waiting_tasks_count, wait_time_ms, signal_wait_time_ms, wait_time_ms / waiting_tasks_count from sys.dm_os_wait_stats where wait_type like 'PAGEIOLATCH%' and waiting_tasks_count > 0 order by wait_type
/* 系统中的每个工作线程 */
select * from sys.dm_os_workers
/* 系统中的所有SQLOS工作线程 */
select COUNT(*) from sys.dm_os_threads
/* SQL Server 实例中的每个活动任务 */
select * from sys.dm_os_tasks
/* 连接的所有用户名 */
select hostname from master..sysprocesses where hostname <> ' ' group by hostname /* 不同计算机连接的用户数 */ select count(distinct(hostname)) from master..sysprocesses where hostname <> ' ' /* 所有连接的用户数 */ select count(hostname) from master..sysprocesses where hostname <> ' '
sp_monitor
sp_who
Select * from master.dbo.spt_monitor
Select * from sys.dm_os_tasks
Select * from master..sysprocesses where hostname <> ' '
Select count(hostname) from master..sysprocesses where hostname <> ' '
Select * from sys.dm_os_tasks
Select connectnum=count(distinct net_address)-1 from master..sysprocesses
Select connectnum=count(distinct net_address)-1 from master..sysprocesses
select * from master.dbo.spt_monitor