常用Sqlserver中的查询语句

/* 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 connectnum=count(distinct net_address)-1 from master..sysprocesses

select * from master.dbo.spt_monitor