May 17, 2026, 11:40 PM
This commit is contained in:
Paweł Domański
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/*************************************************
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I got this scripts from SQLskills.com
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writtern by Paul Randal.
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*************************************************/
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--==========================================--
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/*** 1. Monitor IO on databases files from
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the server starting or Database Online ***/
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--==========================================--
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SELECT
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[ReadLatency] =
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CASE
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WHEN [num_of_reads] = 0 THEN 0
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ELSE ([io_stall_read_ms] / [num_of_reads])
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END,
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[WriteLatency] =
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CASE
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WHEN [num_of_writes] = 0 THEN 0
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ELSE ([io_stall_write_ms] / [num_of_writes])
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END,
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[Latency] =
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CASE
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WHEN ([num_of_reads] = 0 AND
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[num_of_writes] = 0) THEN 0
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ELSE ([io_stall] / ([num_of_reads] + [num_of_writes]))
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END,
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[AvgBPerRead] =
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CASE
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WHEN [num_of_reads] = 0 THEN 0
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ELSE ([num_of_bytes_read] / [num_of_reads])
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END,
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[AvgBPerWrite] =
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CASE
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WHEN [num_of_writes] = 0 THEN 0
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ELSE ([num_of_bytes_written] / [num_of_writes])
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END,
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[AvgBPerTransfer] =
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CASE
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WHEN ([num_of_reads] = 0 AND
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[num_of_writes] = 0) THEN 0
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ELSE (([num_of_bytes_read] + [num_of_bytes_written]) /
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([num_of_reads] + [num_of_writes]))
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END,
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LEFT([mf].[physical_name], 2) AS [Drive],
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DB_NAME([vfs].[database_id]) AS [DB],
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[mf].[physical_name]
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FROM sys.dm_io_virtual_file_stats(NULL, NULL) AS [vfs]
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JOIN sys.master_files AS [mf]
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ON [vfs].[database_id] = [mf].[database_id]
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AND [vfs].[file_id] = [mf].[file_id]
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-- WHERE [vfs].[file_id] = 2 -- log files
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-- ORDER BY [Latency] DESC
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-- ORDER BY [ReadLatency] DESC
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ORDER BY [WriteLatency] DESC;
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GO
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--==========================================--
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/*** 2. Monitor IO For particular period ***/
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--==========================================--
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-- In line 41 you can mention the time period
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-- ie; WAITFOR DELAY '00:30:00';
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IF EXISTS (SELECT
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*
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FROM [tempdb].[sys].[objects]
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WHERE [name] = N'##Stats1')
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DROP TABLE [##Stats1];
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IF EXISTS (SELECT
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*
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FROM [tempdb].[sys].[objects]
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WHERE [name] = N'##Stats2')
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DROP TABLE [##Stats2];
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GO
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SELECT
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[database_id],
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[file_id],
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[num_of_reads],
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[io_stall_read_ms],
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[num_of_writes],
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[io_stall_write_ms],
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[io_stall],
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[num_of_bytes_read],
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[num_of_bytes_written],
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[file_handle] INTO ##Stats1
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FROM sys.dm_io_virtual_file_stats(NULL, NULL);
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GO
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WAITFOR DELAY '00:00:30';
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GO
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SELECT
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[database_id],
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[file_id],
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[num_of_reads],
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[io_stall_read_ms],
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[num_of_writes],
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[io_stall_write_ms],
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[io_stall],
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[num_of_bytes_read],
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[num_of_bytes_written],
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[file_handle] INTO ##Stats2
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FROM sys.dm_io_virtual_file_stats(NULL, NULL);
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GO
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WITH [DiffLatencies]
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AS (SELECT
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-- Files that weren't in the first snapshot
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[ts2].[database_id],
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[ts2].[file_id],
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[ts2].[num_of_reads],
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[ts2].[io_stall_read_ms],
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[ts2].[num_of_writes],
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[ts2].[io_stall_write_ms],
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[ts2].[io_stall],
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[ts2].[num_of_bytes_read],
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[ts2].[num_of_bytes_written]
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FROM [##Stats2] AS [ts2]
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LEFT OUTER JOIN [##Stats1] AS [ts1]
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ON [ts2].[file_handle] = [ts1].[file_handle]
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WHERE [ts1].[file_handle] IS NULL
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UNION
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SELECT
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-- Diff of latencies in both snapshots
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[ts2].[database_id],
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[ts2].[file_id],
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[ts2].[num_of_reads] - [ts1].[num_of_reads] AS [num_of_reads],
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[ts2].[io_stall_read_ms] - [ts1].[io_stall_read_ms] AS [io_stall_read_ms],
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[ts2].[num_of_writes] - [ts1].[num_of_writes] AS [num_of_writes],
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[ts2].[io_stall_write_ms] - [ts1].[io_stall_write_ms] AS [io_stall_write_ms],
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[ts2].[io_stall] - [ts1].[io_stall] AS [io_stall],
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[ts2].[num_of_bytes_read] - [ts1].[num_of_bytes_read] AS [num_of_bytes_read],
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[ts2].[num_of_bytes_written] - [ts1].[num_of_bytes_written] AS [num_of_bytes_written]
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FROM [##Stats2] AS [ts2]
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LEFT OUTER JOIN [##Stats1] AS [ts1]
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ON [ts2].[file_handle] = [ts1].[file_handle]
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WHERE [ts1].[file_handle] IS NOT NULL)
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SELECT
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DB_NAME([vfs].[database_id]) AS [DB],
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LEFT([mf].[physical_name], 2) AS [Drive],
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[mf].[type_desc],
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[num_of_reads] AS [Reads],
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[num_of_writes] AS [Writes],
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[ReadLatency(ms)] =
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CASE
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WHEN [num_of_reads] = 0 THEN 0
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ELSE ([io_stall_read_ms] / [num_of_reads])
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END,
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[WriteLatency(ms)] =
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CASE
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WHEN [num_of_writes] = 0 THEN 0
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ELSE ([io_stall_write_ms] / [num_of_writes])
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END,
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/*[Latency] =
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CASE WHEN ([num_of_reads] = 0 AND [num_of_writes] = 0)
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THEN 0 ELSE ([io_stall] / ([num_of_reads] + [num_of_writes])) END,*/
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[AvgBPerRead] =
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CASE
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WHEN [num_of_reads] = 0 THEN 0
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ELSE ([num_of_bytes_read] / [num_of_reads])
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END,
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[AvgBPerWrite] =
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CASE
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WHEN [num_of_writes] = 0 THEN 0
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ELSE ([num_of_bytes_written] / [num_of_writes])
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END,
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/*[AvgBPerTransfer] =
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CASE WHEN ([num_of_reads] = 0 AND [num_of_writes] = 0)
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THEN 0 ELSE
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(([num_of_bytes_read] + [num_of_bytes_written]) /
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([num_of_reads] + [num_of_writes])) END,*/
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[mf].[physical_name]
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FROM [DiffLatencies] AS [vfs]
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JOIN sys.master_files AS [mf]
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ON [vfs].[database_id] = [mf].[database_id]
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AND [vfs].[file_id] = [mf].[file_id]
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-- ORDER BY [ReadLatency(ms)] DESC
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ORDER BY [WriteLatency(ms)] DESC;
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GO
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-- Cleanup
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IF EXISTS (SELECT
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*
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FROM [tempdb].[sys].[objects]
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WHERE [name] = N'##Stats1')
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DROP TABLE [##Stats1];
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IF EXISTS (SELECT
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*
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FROM [tempdb].[sys].[objects]
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WHERE [name] = N'##Stats2')
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DROP TABLE [##Stats2];
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GO
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