SQL Server Performance File IO Statistics

Hi,

Disk IO Statistics are very crucial for SQL Server Performance criteria.

Every transaction in SQL Server makes IO to bring data from physical disk to the buffer and just the opposite when Transaction is completed, all related data will transfer from buffer to the physical disk.

So Disk speed and IO stats are very important for Performance criteria.

To see IO stats and following information you can execute below script.

• Machine name
• Instance name
• SQL Server name
• Database name
• Logical name
• Physical name
• Disk drive
• File type
• State
• Size on disk
• Growth
• Number of reads
• Number of writes
• IO_stall_read_ms
• IO_stall_write_ms

select 
serverproperty('MachineName') 'machine_name'
,isnull(serverproperty('InstanceName'),'mssqlserver') 'instance_name'
,@@SERVERNAME 'sql_server_name'
,DB_NAME(mf.database_id) 'database_name'
,mf.name 'logical_name'
,mf.physical_name 'physical_name'
,left(mf.physical_name,1) 'disk_drive'
,mf.type_desc 'file_type'
,mf.state_desc 'state'
,case mf.is_read_only
when 0 then 'no'
when 1 then 'yes'
end 'read_only'
,convert(numeric(18,2),convert(numeric,mf.size)*8/1024) 'size_mb'
,divfs.size_on_disk_bytes/1024/1024 'size_on_disk_mb'
,case mf.is_percent_growth
when 0 then cast(convert(int,convert(numeric,mf.growth)*8/1024) as varchar) + ' MB'
when 1 then cast(mf.growth as varchar) + '%'
end 'growth'
,case mf.is_percent_growth
when 0 then convert(numeric(18,2),convert(numeric,mf.growth)*8/1024)
when 1 then convert(numeric(18,2),(convert(numeric,mf.size)*mf.growth/100)*8/1024)
end 'next_growth_mb'
,case mf.max_size
when 0 then 'NO-growth'
when -1 then (case mf.growth when 0 then 'NO-growth' else 'unlimited' end)
else cast(convert(int,convert(numeric,mf.max_size)*8/1024) as varchar)+' MB'
end 'max_size'

,divfs.num_of_reads
,divfs.num_of_bytes_read/1024/1024 'read_mb'
,divfs.io_stall_read_ms

,divfs.num_of_writes
,divfs.num_of_bytes_written/1024/1024 'write_mb'
,divfs.io_stall_write_ms

from sys.master_files as mf
left outer join sys.dm_io_virtual_file_stats(null,null) as divfs
on mf.database_id=divfs.database_id and mf.file_id=divfs.file_id;

Do you want to learn Microsoft SQL Server DBA Tutorials for Beginners, then read the following articles.

https://ittutorial.org/sql-server-tutorials-microsoft-database-for-beginners/