1.IO分析
1 with DB_IO as ( 2 select 3 db_name(a.database_id) as [dbname], 4 case when b.type_desc='LOG' then 'LogFile' else 'DataFile' end as FileType, 5 num_of_reads, 6 num_of_writes, 7 sum(a.io_stall) as io_stall, 8 sum(num_of_bytes_read+num_of_bytes_written) as TotalIOBytes 9 from sys.dm_io_virtual_file_stats(null,null) a join sys.master_files b 10 on a.database_id=b.database_id and a.file_id=b.file_id 11 group by db_name(a.database_id),b.type_desc,num_of_reads,num_of_writes 12 ) 13 select 14 dbname, 15 FileType, 16 num_of_reads, 17 num_of_writes, 18 cast(1. * TotalIOBytes/(1024*1024) as decimal(12,2)) as IO_MB, 19 cast(1. * io_stall/1000 as decimal(12,2)) as IO_stall_s, 20 cast(100. * io_stall/sum(io_stall) over() as decimal(10,2)) as [IO_stall_pct%],--占总IO的百分比 21 row_number() over(order by io_stall desc) as rn 22 from DB_IO