-- 查看性能记数器

 

SELECT * FROM sys.dm_os_performance_counters

 

 -- 执行过的线程所遇到的所有等待(不是当前正在运行的线程, 为自上次重置统计信息或启动服务器以来累积的数据),可分析靠前的几个等待较高的事件。

select * from sys.dm_os_wait_stats order by wait_time_ms desc

该动态视图的细节，请查看帮助文档. 

 

-- 重置该动态视图

DBCC SQLPERF ('sys.dm_os_wait_stats', CLEAR);

GO

 

 

 -- 正在等待某些资源的任务的等待队列

 select * from sys.dm_os_waiting_tasks order by wait_duration_ms desc

 

 

 

 

 

内存使用： 

查看当前由 SQL Server 分配的内存对象(KB): select sum((page_size_in_bytes/1024)*max_pages_allocated_count) from sys.dm_os_memory_objects;

查看系统内存当前信息: select * from sys.dm_os_sys_memory (这个动态视图只在sql 2008中才有)

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

 

限制SQL Server使用的最小,最大内存(MB)：

sp_configure 'show advanced options', 1;

GO

RECONFIGURE;

GO

sp_configure 'min server memory', 300;

GO

sp_configure 'max server memory', 850;

GO

RECONFIGURE;

GO

CPU使用情况:

SELECT TOP 50

total_worker_time/execution_count AS '每次执行占用CPU(微秒)',

execution_count       as '执行次数',

total_worker_time     as '总共占用CPU(微秒)',

creation_time         as '创建时间',

last_execution_time   as '最后执行时间',

min_worker_time       as '最低每次占用CPU',

max_worker_time       as '最高每次占用cpu',

total_physical_reads  as '总共io物理读取次数',

total_logical_reads   as '总共逻辑读取次数',

total_logical_writes  as '总共逻辑写次数',

total_elapsed_time    as '完成此计划的执行所占用的总时间(微秒)',

(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 'SQL内容'

FROM sys.dm_exec_query_stats

ORDER BY 1 DESC

 

 

--下面的查询显示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;

 

SQL Server中的活动会话数:

exec   sp_who   'active'

print @@rowcount

 

SQL Server等待情况

select * from sys.dm_os_waiting_tasks ; --当前等待事件

select * from sys.dm_os_wait_stats  --历史等待次数,是sqlserver启动后的累计值,需使用下一条语句清空

DBCC SQLPERF ('sys.dm_os_wait_stats', CLEAR);

找出进程阻塞:

运行下面的查询可确定阻塞的会话

select blocking_session_id, wait_duration_ms, session_id from

sys.dm_os_waiting_tasks

where blocking_session_id is not null

 

spid 正在阻塞另一个 spid，可在数据库中创建以下存储过程，然后执行该存储过程。此存储过程会报告此阻塞情况。键入 sp_who 可找出 @spid；@spid 是可选参数。

create proc dbo.sp_block (@spid bigint=NULL)

as

select

    t1.resource_type,

    'database'=db_name(resource_database_id),

    'blk object' = t1.resource_associated_entity_id,

    t1.request_mode,

    t1.request_session_id,

    t2.blocking_session_id   

from

    sys.dm_tran_locks as t1,

    sys.dm_os_waiting_tasks as t2

where

    t1.lock_owner_address = t2.resource_address and

    t1.request_session_id = isnull(@spid,t1.request_session_id)

以下是使用此存储过程的示例。

exec sp_block

exec sp_block @spid = 7

select sum((page_size_in_bytes/1024)*max_pages_allocated_count) from sys.dm_os_memory_objects;

select * from sys.dm_os_sys_info;

select * from sys.dm_os_performance_counters

 

 

 

 

A. 获取有关按平均 CPU 时间排在最前面的五个查询的信息

以下示例返回前五个查询的 SQL 语句文本和平均 CPU 时间。

 SELECT TOP 5 total_worker_time/execution_count AS [Avg CPU Time],

    SUBSTRING(st.text, (qs.statement_start_offset/2)+1,

        ((CASE qs.statement_end_offset

          WHEN -1 THEN DATALENGTH(st.text)

         ELSE qs.statement_end_offset

         END - qs.statement_start_offset)/2) + 1) AS statement_text

FROM sys.dm_exec_query_stats AS qs

CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st

ORDER BY total_worker_time/execution_count DESC;

 

B. 提供批处理执行统计信息

以下示例返回按批执行的 SQL 查询的文本，并提供有关它们的统计信息。

 

SELECT s2.dbid,

    s1.sql_handle, 

    (SELECT TOP 1 SUBSTRING(s2.text,statement_start_offset / 2+1 ,

      ( (CASE WHEN statement_end_offset = -1

         THEN (LEN(CONVERT(nvarchar(max),s2.text)) * 2)

         ELSE statement_end_offset END)  - statement_start_offset) / 2+1))  AS sql_statement,

    execution_count,

    plan_generation_num,

    last_execution_time,  

    total_worker_time,

    last_worker_time,

    min_worker_time,

    max_worker_time,

    total_physical_reads,

    last_physical_reads,

    min_physical_reads, 

    max_physical_reads, 

    total_logical_writes,

    last_logical_writes,

    min_logical_writes,

    max_logical_writes 

FROM sys.dm_exec_query_stats AS s1

CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS s2 

WHERE s2.objectid is null

ORDER BY s1.sql_handle, s1.statement_start_offset, s1.statement_end_offset; 

 

-- 数据库文件性能,文件io性能统计(必须重启sql server服务,才能清零该计数器)

 select DB_NAME(database_id) DB_NAME, file_id,io_stall_read_ms ,num_of_reads

,cast(io_stall_read_ms/(1.0+num_of_reads) as numeric(10,1)) as 'avg_read_stall_ms'

,io_stall_write_ms,num_of_writes

,cast(io_stall_write_ms/(1.0+num_of_writes) as numeric(10,1)) as 'avg_write_stall_ms'

,io_stall_read_ms + io_stall_write_ms as io_stalls

,num_of_reads + num_of_writes as total_io

,cast((io_stall_read_ms+io_stall_write_ms)/(1.0+num_of_reads + num_of_writes) as numeric(10,1)) as 'avg_io_stall_ms'

from sys.dm_io_virtual_file_stats(null,null)

order by avg_io_stall_ms desc;

 

 

-- 查看分区表money，各个分区的行数和边界值.

select partition = $partition.分区函数名(userid)

      ,rows      = count(*)

      ,minval    = min(userid)

      ,maxval    = max(userid)

  from dbo.money with(nolock)

 group by $partition.分区函数名(userid)

 order by partition;