sqlserver 数据库巡检脚本
--查看数据库版本信息
select @@version
--查看所有数据库名称及大小
exec sp_helpdb
--所有数据库状态
select name,
user_access_desc,--用户访问模式
state_desc,--数据库状态
recovery_model_desc,--恢复模式
page_verify_option_desc,--页检测选项
log_reuse_wait_desc--日志重用等待
from sys.databases;
--某个数据库的大小
exec sp_spaceused
--刷新某个数据库统计信息
dbcc updateusage('CF_TBMPRO')
--某个数据库中的所有文件及大小
exec sp_helpfile
--查看所有文件所在数据库、路径、状态、大小
select db_name(database_id) dbname,
type_desc,
name,
physical_name,
state_desc,
size * 8.0/1024 as '文件大小（MB）'
from sys.master_files;
--某个数据库大小统计，TotalExtents*64/1024(MB)，不统计日志文件
dbcc showfilestats
--统计某个数据库所有的表信息
--查询数据库设置的 Recovery Model
SELECT db.[name] AS [Database Name]
,db.recovery_model_desc AS [Recovery Model]
,db.state_desc
,db.log_reuse_wait_desc AS [Log Reuse Wait Description]
,CONVERT(DECIMAL(18, 2), ls.cntr_value / 1024.0) AS [Log Size (MB)]
,CONVERT(DECIMAL(18, 2), lu.cntr_value / 1024.0) AS [Log Used (MB)]
,CAST(CAST(lu.cntr_value AS FLOAT) / CAST(ls.cntr_value AS FLOAT) AS DECIMAL(18, 2)) * 100 AS [Log Used %]
,db.[compatibility_level] AS [DB Compatibility Level]
,db.page_verify_option_desc AS [Page Verify Option]
,db.is_auto_create_stats_on
,db.is_auto_update_stats_on
,db.is_auto_update_stats_async_on
,db.is_parameterization_forced
,db.snapshot_isolation_state_desc
,db.is_read_committed_snapshot_on
,db.is_auto_close_on
,db.is_auto_shrink_on
,db.target_recovery_time_in_seconds
,db.is_cdc_enabled
FROM sys.databases AS db WITH (NOLOCK)
INNER JOIN sys.dm_os_performance_counters AS lu WITH (NOLOCK) ON db.NAME = lu.instance_name
INNER JOIN sys.dm_os_performance_counters AS ls WITH (NOLOCK) ON db.NAME = ls.instance_name
WHERE lu.counter_name LIKE N'Log File(s) Used Size (KB)%'
AND ls.counter_name LIKE N'Log File(s) Size (KB)%'
AND ls.cntr_value > 0
OPTION (RECOMPILE);
--查看近的 Full Backup 信息
--use #DB_name
SELECT TOP (30) bs.machine_name
,bs.server_name
,bs.database_name AS [Database Name]
,bs.recovery_model
,CONVERT(BIGINT, bs.backup_size / 1048576) AS [Uncompressed Backup Size (MB)]
,CONVERT(BIGINT, bs.compressed_backup_size / 1048576) AS [Compressed Backup Size (MB)]
,CONVERT(NUMERIC(20, 2), (CONVERT(FLOAT, bs.backup_size) / CONVERT(FLOAT, bs.compressed_backup_size))) AS [Compression Ratio]
,DATEDIFF(SECOND, bs.backup_start_date, bs.backup_finish_date) AS [Backup Elapsed Time (sec)]
,bs.backup_finish_date AS [Backup Finish Date]
FROM msdb.dbo.backupset AS bs WITH (NOLOCK)
WHERE DATEDIFF(SECOND, bs.backup_start_date, bs.backup_finish_date) > 0
AND bs.backup_size > 0
AND bs.type = 'D' -- Change to L if you want Log backups
AND database_name = DB_NAME(DB_ID())
ORDER BY bs.backup_finish_date DESC
OPTION (RECOMPILE);
--获取所有数据库的 VLF 数量
/*VLF ：Virtual Log File
SQL Server 将日志文件 LDF 划分为多个 VLF 以提高日志处理效率。VLF 的数量和大小不能通过配置指定，SQL Server 会按情况自行判断处理，而如果生成了过多的 VLF 则会产生性能问题。通过指定合理的日志文件初始大小和增长步长，可以有效的防止过多 VLF 的产生。
1M-64M 4
64M-1GB 8
>1GB 16
较高的 VLF 数量会影响写入性能，并且会使数据库的恢复过程变慢，通常需要保持 VLF Counts 在 200 以下。*/
CREATE TABLE #VLFInfo (
RecoveryUnitID INT
,FileID INT
,FileSize BIGINT
,StartOffset BIGINT
,FSeqNo BIGINT
,[Status] BIGINT
,Parity BIGINT
,CreateLSN NUMERIC(38)
);
CREATE TABLE #VLFCountResults (
DatabaseName SYSNAME
,VLFCount INT
);
EXEC sp_MSforeachdb N'Use [?];
INSERT INTO #VLFInfo
EXEC sp_executesql N''DBCC LOGINFO([?])'';
INSERT INTO #VLFCountResults
SELECT DB_NAME(), COUNT(*)
FROM #VLFInfo;
TRUNCATE TABLE #VLFInfo;'
SELECT DatabaseName
,VLFCount
FROM #VLFCountResults
ORDER BY VLFCount DESC;
DROP TABLE #VLFInfo;
DROP TABLE #VLFCountResults;
--查看数据库所在机器的操作系统参数
exec master..xp_msver
--查看数据库启动的参数
exec sp_configure
--查看数据库启动时间
select convert(varchar(30),login_time,120)
from master..sysprocesses where spid=1
--查看数据库服务器名
select 'Server Name:'+ltrim(@@servername)
--查看Windows 操作系统是什么版本
SELECT windows_release
,windows_service_pack_level
,windows_sku
,os_language_version
FROM sys.dm_os_windows_info WITH (NOLOCK)
OPTION (RECOMPILE);
--其中 windows_release 中的版本号代表着：
-- 6.3 Windows 8.1 or Windows Server 2012 R2
-- 6.2 Windows 8 or Windows Server 2012
-- 6.1 Windows 7 or Windows Server 2008 R2
-- 6.0 Windows Vista or Windows Server 2008
-- 5.2 Windows XP or Windows Server 2003
--其中 windows_sku 代表着：
-- 4 Enterprise Edition
-- 7 Standard Edition
-- 48 Professional Edition
--查看数据库实例名
select 'Instance:'+ltrim(@@servicename)
--数据库的磁盘空间及使用信息
exec sp_spaceused
--日志文件大小及使用情况
dbcc sqlperf(logspace)
--表的磁盘空间使用信息
exec sp_spaceused 'tablename'
--获取磁盘读写情况
select
@@total_read [读取磁盘次数],
@@total_write [写入磁盘次数],
@@total_errors [磁盘写入错误数],
getdate() [当前时间]
--数据文件和日志文件位置和大小
SELECT DB_NAME([database_id]) AS [Database Name]
,[file_id]
,[name]
,physical_name
,type_desc
,state_desc
,is_percent_growth
,growth
,CONVERT(BIGINT, growth / 128.0) AS [Growth in MB]
,CONVERT(BIGINT, size / 128.0) AS [Total Size in MB]
FROM sys.master_files WITH (NOLOCK)
WHERE [database_id] > 4
AND [database_id] <> 32767
OR [database_id] = 2
ORDER BY DB_NAME([database_id])
OPTION (RECOMPILE);
--查看指定数据库文件的大小和可用空间
SELECT f.[name] AS [File Name]
,f.physical_name AS [Physical Name]
,CAST((f.size / 128.0) AS DECIMAL(15, 2)) AS [Total Size in MB]
,CAST(f.size / 128.0 - CAST(FILEPROPERTY(f.[name], 'SpaceUsed') AS INT) / 128.0 AS DECIMAL(15, 2)) AS [Available Space In MB]
,[file_id]
,fg.[name] AS [Filegroup Name]
FROM sys.database_files AS f WITH (NOLOCK)
LEFT OUTER JOIN sys.data_spaces AS fg WITH (NOLOCK) ON f.data_space_id = fg.data_space_id
OPTION (RECOMPILE);
SELECT db_name(vs.database_id) AS DatabaseName
,vs.file_id
,vs.volume_mount_point
,vs.volume_id
,vs.logical_volume_name
,vs.file_system_type
,(vs.total_bytes / 1024 / 1024 / 1024) AS [TotalSize(GB)]
,(vs.available_bytes / 1024 / 1024 / 1024) AS [AvailableSize(GB)]
,vs.supports_compression
,vs.supports_alternate_streams
,vs.supports_sparse_files
,vs.is_read_only
,vs.is_compressed
FROM sys.master_files mf
CROSS APPLY sys.dm_os_volume_stats(mf.database_id, mf.file_id) vs;
--服务器 Disk 容量和挂载信息
SELECT DISTINCT vs.volume_mount_point
,vs.file_system_type
,vs.logical_volume_name
,CONVERT(DECIMAL(18, 2), vs.total_bytes / 1073741824.0) AS [Total Size (GB)]
,CONVERT(DECIMAL(18, 2), vs.available_bytes / 1073741824.0) AS [Available Size (GB)]
,CAST(CAST(vs.available_bytes AS FLOAT) / CAST(vs.total_bytes AS FLOAT) AS DECIMAL(18, 2)) * 100 AS [Space Free %]
FROM sys.master_files AS f WITH (NOLOCK)
CROSS APPLY sys.dm_os_volume_stats(f.database_id, f.[file_id]) AS vs
OPTION (RECOMPILE);
--查看 Disk 剩余空间
EXEC master.dbo.xp_fixeddrives
SELECT DISTINCT SUBSTRING(volume_mount_point, 1, 1) AS Volume_mount_point
,total_bytes / 1024 / 1024 AS Total_MB
,available_bytes / 1024 / 1024 AS Available_MB
FROM sys.master_files AS f
CROSS APPLY sys.dm_os_volume_stats(f.database_id, f.file_id);
--获取I/O工作情况
select @@io_busy,
@@timeticks [每个时钟周期对应的微秒数],
@@io_busy*@@timeticks [I/O操作毫秒数],
getdate() [当前时间]
--查看CPU活动及工作情况
select
@@cpu_busy,
--@@timeticks [每个时钟周期对应的微秒数],
@@cpu_busy*cast(@@timeticks as float)/1000 [CPU工作时间(秒)],
@@idle*cast(@@timeticks as float)/1000 [CPU空闲时间(秒)],
getdate() [当前时间]
--检查锁与等待
exec sp_lock
--检查死锁
exec sp_who_lock --自己写个存储过程即可
/*
create procedure sp_who_lock
as
begin
declare @spid int,@bl int,
@intTransactionCountOnEntry int,
@intRowcount int,
@intCountProperties int,
@intCounter int
create table #tmp_lock_who (id int identity(1,1),spid smallint,bl smallint)
IF @@ERROR<>0 RETURN @@ERROR
insert into #tmp_lock_who(spid,bl) select 0 ,blocked
from (select * from sys.sysprocesses where blocked>0 ) a
where not exists(select * from (select * from sys.sysprocesses where blocked>0 ) b
where a.blocked=spid)
union select spid,blocked from sys.sysprocesses where blocked>0
IF @@ERROR<>0 RETURN @@ERROR
-- 找到临时表的记录数
select @intCountProperties = Count(*),@intCounter = 1
from #tmp_lock_who
IF @@ERROR<>0 RETURN @@ERROR
if @intCountProperties=0
select '现在没有阻塞和死锁信息' as message
-- 循环开始
while @intCounter <= @intCountProperties
begin
-- 取条记录
select @spid = spid,@bl = bl
from #tmp_lock_who where id = @intCounter
begin
if @spid =0
select '引起数据库死锁的是: '+ CAST(@bl AS VARCHAR(10)) + '进程号,其执行的SQL语法如下'
else
select '进程号SPID：'+ CAST(@spid AS VARCHAR(10))+ '被' + '进程号SPID：'+ CAST(@bl AS VARCHAR(10)) +'阻塞,其当前进程执行的SQL语法如下'
DBCC INPUTBUFFER (@bl )
end
-- 循环指针下移
set @intCounter = @intCounter + 1
end
drop table #tmp_lock_who
return 0
end
*/
--用户和进程信息
exec sp_who
exec sp_who2
--活动用户和进程的信息
exec sp_who 'active'
--查看进程中正在执行的SQL
dbcc inputbuffer(进程号)
exec sp_who3
/*
CREATE PROCEDURE sp_who3 ( @SessionID INT = NULL )
AS
BEGIN
SELECT SPID = er.session_id ,
Status = ses.status ,
[Login] = ses.login_name ,
Host = ses.host_name ,
BlkBy = er.blocking_session_id ,
DBName = DB_NAME(er.database_id) ,
CommandType = er.command ,
SQLStatement = st.text ,
ObjectName = OBJECT_NAME(st.objectid) ,
ElapsedMS = er.total_elapsed_time ,
CPUTime = er.cpu_time ,
IOReads = er.logical_reads + er.reads ,
IOWrites = er.writes ,
LastWaitType = er.last_wait_type ,
StartTime = er.start_time ,
Protocol = con.net_transport ,
ConnectionWrites = con.num_writes ,
ConnectionReads = con.num_reads ,
ClientAddress = con.client_net_address ,
Authentication = con.auth_scheme
FROM sys.dm_exec_requests er
OUTER APPLY sys.dm_exec_sql_text(er.sql_handle) st
LEFT JOIN sys.dm_exec_sessions ses ON ses.session_id = er.session_id
LEFT JOIN sys.dm_exec_connections con ON con.session_id = ses.session_id
WHERE er.session_id > 50
AND @SessionID IS NULL
OR er.session_id = @SessionID
ORDER BY er.blocking_session_id DESC ,
er.session_id
END
*/
--查看所有数据库用户登录信息
exec sp_helplogins
--查看所有数据库用户所属的角色信息
exec sp_helpsrvrolemember
--查看链接服务器
exec sp_helplinkedsrvlogin
--查看远端数据库用户登录信息
exec sp_helpremotelogin
--获取网络数据包统计信息
select
@@pack_received [输入数据包数量],
@@pack_sent [输出数据包数量],
@@packet_errors [错误包数量],
getdate() [当前时间]
--查看逻辑CPU情况,任务调度器（Scheduler）
SELECT is_online
,[status]
,COUNT(*) AS [count]
FROM sys.dm_os_schedulers
WHERE scheduler_id < 255
GROUP BY is_online
,[status];
--检查数据库中的所有对象的分配和机构完整性是否存在错误
dbcc checkdb
--查询文件组和文件
select
df.[name],df.physical_name,df.[size],df.growth,
f.[name][filegroup],f.is_default
from sys.database_files df join sys.filegroups f
on df.data_space_id = f.data_space_id
--得到耗时的前10条T-SQL语句
;with maco as
(
select top 10
plan_handle,
sum(total_worker_time) as total_worker_time ,
sum(execution_count) as execution_count ,
count(1) as sql_count
from sys.dm_exec_query_stats group by plan_handle
order by sum(total_worker_time) desc
)
select t.text ,
a.total_worker_time ,
a.execution_count ,
a.sql_count
from maco a
cross apply sys.dm_exec_sql_text(plan_handle) t
--查看SQL Server的实际内存占用
select * from sysperfinfo where counter_name like '%Memory%'
--显示所有数据库的日志空间信息
dbcc sqlperf(logspace)
--查看日志文件所在数据库、路径、状态、大小
select db_name(database_id) dbname,
type_desc,--文件类型
name,
physical_name,--文件位置
state_desc,--文件状态
size * 8.0/1024 as '文件大小（MB）'
from sys.master_files
where type_desc = 'LOG';
--收缩数据库
dbcc shrinkdatabase(CF_HIDB)
--查看某个表的结构
use CF_TBMPRO
exec sp_help 'dbo.PRO_TBM_UIDataPlaceholder'
--查看视图的定义
SELECT object_definition (object_id('sys.tables'));
EXEC sp_helptext 'sys.tables';
--查看数据库中所有表的条数
select b.name as tablename ,
a.rowcnt as datacount
from sysindexes a ,
sysobjects b
where a.id = b.id
and a.indid < 2
and objectproperty(b.id, 'IsMSShipped') = 0
order by datacount desc;
select sum(a.rowcnt) as '总条数'
from sysindexes a ,
sysobjects b
where a.id = b.id
and a.indid < 2
and objectproperty(b.id, 'IsMSShipped') = 0;
--清除 sql server错误日志文件
exec sp_cycle_errorlog
--SQL Server 的错误日志位置
SELECT is_enabled
,[path]
,max_size
,max_files
FROM sys.dm_os_server_diagnostics_log_configurations WITH (NOLOCK)
OPTION (RECOMPILE);
--查询近期的 Error Log 信息
DECLARE @Time_Start DATETIME;
DECLARE @Time_End DATETIME;
SET @Time_Start = getdate() - 2;
SET @Time_End = getdate();
-- Create the temporary table
CREATE TABLE #ErrorLog (
logdate DATETIME
,processinfo VARCHAR(255)
,Message VARCHAR(500)
)
-- Populate the temporary table
INSERT #ErrorLog (
logdate
,processinfo
,Message
)
EXEC master.dbo.xp_readerrorlog 0
,1
,NULL
,NULL
,@Time_Start
,@Time_End
,N'desc';
-- Filter the temporary table
SELECT LogDate
,Message
FROM #ErrorLog
WHERE (
Message LIKE '%error%'
OR Message LIKE '%failed%'
)
AND processinfo NOT LIKE 'logon'
ORDER BY logdate DESC
-- Drop the temporary table
DROP TABLE #ErrorLog
--在错误日志中查询 I/O 超过 15s 的请求
--如果能够查询出结果，可以说明 I/O 性能存在问题，但是哪里引起的还需进一步探索。
CREATE TABLE #IOWarningResults (
LogDate DATETIME
,ProcessInfo SYSNAME
,LogText NVARCHAR(1000)
);
INSERT INTO #IOWarningResults
EXEC xp_readerrorlog 0
,1
,N'taking longer than 15 seconds';
INSERT INTO #IOWarningResults
EXEC xp_readerrorlog 1
,1
,N'taking longer than 15 seconds';
INSERT INTO #IOWarningResults
EXEC xp_readerrorlog 2
,1
,N'taking longer than 15 seconds';
INSERT INTO #IOWarningResults
EXEC xp_readerrorlog 3
,1
,N'taking longer than 15 seconds';
INSERT INTO #IOWarningResults
EXEC xp_readerrorlog 4
,1
,N'taking longer than 15 seconds';
SELECT LogDate
,ProcessInfo
,LogText
FROM #IOWarningResults
ORDER BY LogDate DESC;
DROP TABLE #IOWarningResults;
--查询 Disk 的性能指标
--通常 Latency 的值大于 20-25 ms 时可考虑有性能问题
SELECT [Drive]
,CASE
WHEN num_of_reads = 0
THEN 0
ELSE (io_stall_read_ms / num_of_reads)
END AS [Read Latency (ms)]
,CASE
WHEN io_stall_write_ms = 0
THEN 0
ELSE (io_stall_write_ms / num_of_writes)
END AS [Write Latency (ms)]
,CASE
WHEN (
num_of_reads = 0
AND num_of_writes = 0
)
THEN 0
ELSE (io_stall / (num_of_reads + num_of_writes))
END AS [Overall Latency (ms)]
,CASE
WHEN num_of_reads = 0
THEN 0
ELSE (num_of_bytes_read / num_of_reads)
END AS [Avg Bytes/Read]
,CASE
WHEN io_stall_write_ms = 0
THEN 0
ELSE (num_of_bytes_written / num_of_writes)
END AS [Avg Bytes/Write]
,CASE
WHEN (
num_of_reads = 0
AND num_of_writes = 0
)
THEN 0
ELSE ((num_of_bytes_read + num_of_bytes_written) / (num_of_reads + num_of_writes))
END AS [Avg Bytes/Transfer]
FROM (
SELECT LEFT(UPPER(mf.physical_name), 2) AS Drive
,SUM(num_of_reads) AS num_of_reads
,SUM(io_stall_read_ms) AS io_stall_read_ms
,SUM(num_of_writes) AS num_of_writes
,SUM(io_stall_write_ms) AS io_stall_write_ms
,SUM(num_of_bytes_read) AS num_of_bytes_read
,SUM(num_of_bytes_written) AS num_of_bytes_written
,SUM(io_stall) AS io_stall
FROM sys.dm_io_virtual_file_stats(NULL, NULL) AS vfs
INNER JOIN sys.master_files AS mf WITH (NOLOCK) ON vfs.database_id = mf.database_id
AND vfs.file_id = mf.file_id
GROUP BY LEFT(UPPER(mf.physical_name), 2)
) AS tab
ORDER BY [Overall Latency (ms)]
OPTION (RECOMPILE);
--查看哪个数据库文件 I/O 瓶颈严重
--考虑将数据库文件移动到不同的磁盘上，或更快的磁盘阵列上以改进性能
SELECT DB_NAME(fs.database_id) AS [Database Name]
,CAST(fs.io_stall_read_ms / (1.0 + fs.num_of_reads) AS NUMERIC(10, 1)) AS [avg_read_stall_ms]
,CAST(fs.io_stall_write_ms / (1.0 + fs.num_of_writes) AS NUMERIC(10, 1)) AS [avg_write_stall_ms]
,CAST((fs.io_stall_read_ms + fs.io_stall_write_ms) / (1.0 + fs.num_of_reads + fs.num_of_writes) AS NUMERIC(10, 1)) AS [avg_io_stall_ms]
,CONVERT(DECIMAL(18, 2), mf.size / 128.0) AS [File Size (MB)]
,mf.physical_name
,mf.type_desc
,fs.io_stall_read_ms
,fs.num_of_reads
,fs.io_stall_write_ms
,fs.num_of_writes
,fs.io_stall_read_ms + fs.io_stall_write_ms AS [io_stalls]
,fs.num_of_reads + fs.num_of_writes AS [total_io]
FROM sys.dm_io_virtual_file_stats(NULL, NULL) AS fs
INNER JOIN sys.master_files AS mf WITH (NOLOCK) ON fs.database_id = mf.database_id
AND fs.[file_id] = mf.[file_id]
ORDER BY avg_io_stall_ms DESC
OPTION (RECOMPILE);
--按照 Write I/O 进行排名
SELECT [ReadLatency] = CASE
WHEN [num_of_reads] = 0
THEN 0
ELSE ([io_stall_read_ms] / [num_of_reads])
END
,[WriteLatency] = CASE
WHEN [num_of_writes] = 0
THEN 0
ELSE ([io_stall_write_ms] / [num_of_writes])
END
,[Latency] = CASE
WHEN (
[num_of_reads] = 0
AND [num_of_writes] = 0
)
THEN 0
ELSE ([io_stall] / ([num_of_reads] + [num_of_writes]))
END
,[AvgBytesPerRead] = CASE
WHEN [num_of_reads] = 0
THEN 0
ELSE ([num_of_bytes_read] / [num_of_reads])
END
,[AvgBytesPerWrite] = CASE
WHEN [num_of_writes] = 0
THEN 0
ELSE ([num_of_bytes_written] / [num_of_writes])
END
,[AvgBytesPerTransfer] = CASE
WHEN (
[num_of_reads] = 0
AND [num_of_writes] = 0
)
THEN 0
ELSE (([num_of_bytes_read] + [num_of_bytes_written]) / ([num_of_reads] + [num_of_writes]))
END
,LEFT([mf].[physical_name], 2) AS [Drive]
,DB_NAME([vfs].[database_id]) AS [DB]
,[mf].[physical_name]
,[mf].file_id
FROM sys.dm_io_virtual_file_stats(NULL, NULL) AS [vfs]
JOIN sys.master_files AS [mf] ON [vfs].[database_id] = [mf].[database_id]
AND [vfs].[file_id] = [mf].[file_id]
ORDER BY [WriteLatency] DESC;
--获取数据库的 I/O 使用率
WITH Aggregate_IO_Statistics
AS (
SELECT DB_NAME(database_id) AS [Database Name]
,CAST(SUM(num_of_bytes_read + num_of_bytes_written) / 1048576 AS DECIMAL(12, 2)) AS io_in_mb
FROM sys.dm_io_virtual_file_stats(NULL, NULL) AS [DM_IO_STATS]
GROUP BY database_id
)
SELECT ROW_NUMBER() OVER (
ORDER BY io_in_mb DESC
) AS [I/O Rank]
,[Database Name]
,io_in_mb AS [Total I/O (MB)]
,CAST(io_in_mb / SUM(io_in_mb) OVER () * 100.0 AS DECIMAL(5, 2)) AS [I/O Percent]
FROM Aggregate_IO_Statistics
ORDER BY [I/O Rank]
OPTION (RECOMPILE);
--查看指定数据库文件的 I/O 状况,需要指定数据库
SELECT DB_NAME(DB_ID()) AS [Database Name]
,df.[name] AS [Logical Name]
,vfs.[file_id]
,df.physical_name AS [Physical Name]
,vfs.num_of_reads
,vfs.num_of_writes
,vfs.io_stall_read_ms
,vfs.io_stall_write_ms
,CAST(100. * vfs.io_stall_read_ms / (vfs.io_stall_read_ms + vfs.io_stall_write_ms) AS DECIMAL(10, 1)) AS [IO Stall Reads Pct]
,CAST(100. * vfs.io_stall_write_ms / (vfs.io_stall_write_ms + vfs.io_stall_read_ms) AS DECIMAL(10, 1)) AS [IO Stall Writes Pct]
,(vfs.num_of_reads + vfs.num_of_writes) AS [Writes + Reads]
,CAST(vfs.num_of_bytes_read / 1048576.0 AS DECIMAL(10, 2)) AS [MB Read]
,CAST(vfs.num_of_bytes_written / 1048576.0 AS DECIMAL(10, 2)) AS [MB Written]
,CAST(100. * vfs.num_of_reads / (vfs.num_of_reads + vfs.num_of_writes) AS DECIMAL(10, 1)) AS [# Reads Pct]
,CAST(100. * vfs.num_of_writes / (vfs.num_of_reads + vfs.num_of_writes) AS DECIMAL(10, 1)) AS [# Write Pct]
,CAST(100. * vfs.num_of_bytes_read / (vfs.num_of_bytes_read + vfs.num_of_bytes_written) AS DECIMAL(10, 1)) AS [Read Bytes Pct]
,CAST(100. * vfs.num_of_bytes_written / (vfs.num_of_bytes_read + vfs.num_of_bytes_written) AS DECIMAL(10, 1)) AS [Written Bytes Pct]
FROM sys.dm_io_virtual_file_stats(DB_ID(), NULL) AS vfs
INNER JOIN sys.database_files AS df WITH (NOLOCK) ON vfs.[file_id] = df.[file_id]
OPTION (RECOMPILE);
--找出 I/O 平均使用多的语句
SELECT TOP (50) OBJECT_NAME(qt.objectid, dbid) AS [SP Name]
,(qs.total_logical_reads + qs.total_logical_writes) / qs.execution_count AS [Avg IO]
,qs.execution_count AS [Execution Count]
,SUBSTRING(qt.[text], qs.statement_start_offset / 2 + 1, (
CASE
WHEN qs.statement_end_offset = - 1
THEN LEN(CONVERT(NVARCHAR(max), qt.[text])) * 2
ELSE qs.statement_end_offset
END - qs.statement_start_offset
) / 2) AS [Query Text]
FROM sys.dm_exec_query_stats AS qs WITH (NOLOCK)
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt
WHERE qt.[dbid] = DB_ID()
ORDER BY [Avg IO] DESC
OPTION (RECOMPILE);
--查询正在等待 I/O 的请求等待时间
SELECT DB_NAME(database_id) AS [DBNAME]
,file_id
,io_stall
,io_pending_ms_ticks
,scheduler_address
FROM sys.dm_io_virtual_file_stats(NULL, NULL) iovfs
,sys.dm_io_pending_io_requests AS iopior
WHERE iovfs.file_handle = iopior.io_handle本文来源https://www.modb.pro/db/25425
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