Get IO stats request sql like activity monitor

SELECT d.name, f.name, f.type_desc, f.physical_name,
 [read b/ms] = num_of_bytes_read * 1.0/sample_ms,
 [avg read latency] =
   (1.0*s.io_stall_read_ms / (COALESCE(NULLIF(s.num_of_reads,0),1))),
 [write b/ms] = num_of_bytes_written * 1.0/sample_ms,
 [avg write latency] = 
   (1.0*s.io_stall_write_ms / (COALESCE(NULLIF(s.num_of_writes,0),1)))
FROM sys.master_files AS f
INNER JOIN sys.databases AS d
ON f.database_id = d.database_id
INNER JOIN sys.dm_io_virtual_file_stats(default, default) AS s
ON d.database_id = s.database_id
AND f.[file_id] = s.[file_id];

CREATE PROC #am_generate_waitstats AS 
BEGIN

-- Setup query starts a tran -- make sure it wasn't orphaned
WHILE (@@TRANCOUNT > 0) COMMIT TRAN;

-- Get the most recent snapshot ID in the history table ('previous snapshot')
DECLARE @previous_snapshot_id bigint;
DECLARE @previous_collection_time datetime;
SELECT @previous_snapshot_id = ISNULL (MAX (snapshot_id), 0) FROM #am_wait_stats_snapshots;
SELECT TOP 1 @previous_collection_time = ISNULL (collection_time, GETUTCDATE()) FROM #am_wait_stats_snapshots 
WHERE snapshot_id = @previous_snapshot_id;

-- The snapshot we're about to capture ('current snapshot')
DECLARE @current_snapshot_id bigint;
DECLARE @current_collection_time datetime;
SET @current_collection_time = GETUTCDATE();
SET @current_snapshot_id = @previous_snapshot_id + 1;

-- The snapshots table holds the two most recent snapshots. Delete the older of the two to 
-- make room for a new snapshot. 
DELETE FROM #am_wait_stats_snapshots WHERE snapshot_id < @previous_snapshot_id;
DELETE FROM #am_resource_mon_snap WHERE current_snapshot_id < @previous_snapshot_id;

DECLARE @interval_sec numeric (20, 4);
SET @interval_sec = 
    CASE 
        -- Avoid int overflow that DATEDIFF (ms, ...) can cause in the event of a huge gap between intervals
        WHEN DATEDIFF (second, @previous_collection_time, @current_collection_time) >= 10 
            THEN DATEDIFF (second, @previous_collection_time, @current_collection_time)
        -- Avoid divide-by-zero
        WHEN DATEDIFF (millisecond, @previous_collection_time, @current_collection_time) = 0.0 
            THEN 0.0001
        ELSE DATEDIFF (millisecond, @previous_collection_time, @current_collection_time) / 1000.0
    END;

-- This query captures in-progress and completed (cumulative) wait time for each wait type
INSERT INTO #am_wait_stats_snapshots 
SELECT 
    @previous_snapshot_id + 1 AS snapshot_id, 
    @current_collection_time AS collection_time, 
    wait_type, 
    SUM (waiting_tasks_count) AS waiting_tasks_count, 
    SUM (signal_wait_time_ms) AS signal_wait_time_ms, 
    SUM (wait_time_ms) AS wait_time_ms, 
    SUM (raw_wait_time_ms) AS raw_wait_time_ms
FROM 
(
    -- global server wait stats (completed waits only)
    SELECT 
        wait_type, 
        waiting_tasks_count, 
        (wait_time_ms - signal_wait_time_ms) AS wait_time_ms,  
        signal_wait_time_ms, 
        wait_time_ms AS raw_wait_time_ms
    FROM sys.dm_os_wait_stats
    WHERE waiting_tasks_count > 0 OR wait_time_ms > 0 OR signal_wait_time_ms > 0
    UNION ALL 
    -- threads in an in-progress wait (not yet completed waits)
    SELECT 
        wait_type, 
        1 AS waiting_tasks_count, 
        wait_duration_ms AS wait_time_ms, 
        0 AS signal_wait_time_ms, 
        wait_duration_ms AS raw_wait_time_ms
    FROM sys.dm_os_waiting_tasks
    -- Very brief waits quickly will roll into dm_os_wait_stats; we only need to 
    -- query dm_os_waiting_tasks to handle longer-lived waits. 
    WHERE wait_duration_ms > 10

SET NOCOUNT ON;

DECLARE @previous_collection_time datetime;
DECLARE @previous_total_io_mb numeric (28, 1);
DECLARE @current_collection_time datetime;
DECLARE @current_total_io_mb numeric (28, 1);
DECLARE @mb_per_sec numeric (20, 1);

-- Get the previous snapshot's total I/O
SELECT TOP 1 @previous_collection_time = collection_time, @previous_total_io_mb = total_io_bytes 
FROM #am_dbfileio
ORDER BY collection_time DESC;

-- Get the current total I/O.  
SET @current_collection_time = GETDATE();
SELECT @current_total_io_mb = SUM(num_of_bytes_read + num_of_bytes_written) / 1024.0 / 1024.0
FROM sys.dm_io_virtual_file_stats(default, default);

-- Calc the total I/O rate (MB/sec) for the just-completed time interval. 
-- Round values larger than 2MB/sec to the nearest MB.
SET @mb_per_sec = (@current_total_io_mb - @previous_total_io_mb) / DATEDIFF (millisecond, @previous_collection_time, @current_collection_time) * 1000;
IF @mb_per_sec > 2 
BEGIN
  SET @mb_per_sec = ROUND (@mb_per_sec, 0);
END; 

-- Save off current total I/O
INSERT INTO #am_dbfileio (collection_time, total_io_bytes) 
VALUES (@current_collection_time, @current_total_io_mb);

-- Return the I/O rate for the just-completed time interval. 
SELECT ISNULL (@mb_per_sec, 0) AS mb_per_sec;

-- Get rid of all but the most recent snapshot's data
DELETE FROM #am_dbfileio WHERE collection_time < @current_collection_time;

DECLARE @current_collection_time datetime;
SET @current_collection_time = GETDATE();

-- Grab a snapshot
INSERT INTO #am_dbfilestats
SELECT 
    @current_collection_time AS collection_time, 
    d.name AS [Database], 
    f.physical_name AS [File], 
    (fs.num_of_bytes_read / 1024.0 / 1024.0) [Total MB Read], 
    (fs.num_of_bytes_written / 1024.0 / 1024.0) AS [Total MB Written], 
    (fs.num_of_reads + fs.num_of_writes) AS [Total I/O Count], 
    fs.io_stall AS [Total I/O Wait Time (ms)], 
    fs.size_on_disk_bytes / 1024 / 1024 AS [Size (MB)]
FROM sys.dm_io_virtual_file_stats(default, default) AS fs
INNER JOIN sys.master_files f ON fs.database_id = f.database_id AND fs.file_id = f.file_id
INNER JOIN sys.databases d ON d.database_id = fs.database_id; 

-- Get the timestamp of the previous collection time
DECLARE @previous_collection_time datetime;
SELECT TOP 1 @previous_collection_time = collection_time 
FROM #am_dbfilestats 
WHERE collection_time < @current_collection_time
ORDER BY collection_time DESC;

DECLARE @interval_ms int;
SET @interval_ms = DATEDIFF (millisecond, @previous_collection_time, @current_collection_time); 

-- Return the diff of this snapshot and last
SELECT 
    cur.[Database], 
    cur.[File] AS [File Name], 
    CONVERT (numeric(28,1), (cur.[Total MB Read] - prev.[Total MB Read]) * 1000 / @interval_ms) AS [MB/sec Read], 
    CONVERT (numeric(28,1), (cur.[Total MB Written] - prev.[Total MB Written]) * 1000 / @interval_ms) AS [MB/sec Written], 
    -- protect from div-by-zero
    CASE 
        WHEN (cur.[Total I/O Count] - prev.[Total I/O Count]) = 0 THEN 0
  

DECLARE @current_collection_time datetime;
SET @current_collection_time = GETDATE();

-- Grab a snapshot
INSERT INTO #am_dbfilestats
SELECT 
    @current_collection_time AS collection_time, 
    d.name AS [Database], 
    f.physical_name AS [File], 
    (fs.num_of_bytes_read / 1024.0 / 1024.0) [Total MB Read], 
    (fs.num_of_bytes_written / 1024.0 / 1024.0) AS [Total MB Written], 
    (fs.num_of_reads + fs.num_of_writes) AS [Total I/O Count], 
    fs.io_stall AS [Total I/O Wait Time (ms)], 
    fs.size_on_disk_bytes / 1024 / 1024 AS [Size (MB)]
FROM sys.dm_io_virtual_file_stats(default, default) AS fs
INNER JOIN sys.master_files f ON fs.database_id = f.database_id AND fs.file_id = f.file_id
INNER JOIN sys.databases d ON d.database_id = fs.database_id; 

-- Get the timestamp of the previous collection time
DECLARE @previous_collection_time datetime;
SELECT TOP 1 @previous_collection_time = collection_time 
FROM #am_dbfilestats 
WHERE collection_time < @current_collection_time
ORDER BY collection_time DESC;

DECLARE @interval_ms int;
SET @interval_ms = DATEDIFF (millisecond, @previous_collection_time, @current_collection_time); 

-- Return the diff of this snapshot and last
SELECT 
    cur.[Database], 
    cur.[File] AS [File Name], 
    CONVERT (numeric(28,1), (cur.[Total MB Read] - prev.[Total MB Read]) * 1000 / @interval_ms) AS [MB/sec Read], 
    CONVERT (numeric(28,1), (cur.[Total MB Written] - prev.[Total MB Written]) * 1000 / @interval_ms) AS [MB/sec Written], 
    -- protect from div-by-zero
    CASE 
        WHEN (cur.[Total I/O Count] - prev.[Total I/O Count]) = 0 THEN 0
        ELSE
            (cur.[Total I/O Wait Time (ms)] - prev.[Total I/O Wait Time (ms)]) 
                / (cur.[Total I/O Count] - prev.[Total I/O Count])
    END AS [Response Time (ms)]
FROM #am_dbfilestats AS cur
INNER JOIN #am_dbfilestats AS prev ON prev.[Database] = cur.[Database] AND prev.[File] = cur.[File]
WHERE cur.collection_time = @current_collection_time 
    AND prev.collection_time = @previous_collection_time;

-- Delete the older snapshot
DELETE FROM #am_dbfilestats
WHERE collection_time != @current_collection_time;