forked from vincent/notebook
48 lines
2.0 KiB
MySQL
48 lines
2.0 KiB
MySQL
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SELECT mf.*, volume_mount_point, 1.0 * total_bytes / POWER(1024, 3) AS DISK_SIZE_GB,
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1.0 * available_bytes / POWER(1024, 3) AS FREE_SIZE_GB,
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100 * (1 - 1.0 * available_bytes/total_bytes) PERCENT_USED
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FROM sys.master_files AS mf
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CROSS APPLY sys.dm_os_volume_stats(database_id, file_id);
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WITH
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disk_activity AS
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(SELECT LEFT(mf.physical_name, 2) AS Drive,
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SUM(num_of_reads) AS num_of_reads,
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SUM(io_stall_read_ms) AS io_stall_read_ms,
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SUM(num_of_writes) AS num_of_writes,
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SUM(io_stall_write_ms) AS io_stall_write_ms,
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SUM(num_of_bytes_read) AS num_of_bytes_read,
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SUM(num_of_bytes_written) AS num_of_bytes_written, SUM(io_stall) AS io_stall
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FROM sys.dm_io_virtual_file_stats(NULL, NULL) AS vfs
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INNER JOIN sys.master_files AS mf WITH (NOLOCK)
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ON vfs.database_id = mf.database_id AND vfs.file_id = mf.file_id
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GROUP BY LEFT(mf.physical_name, 2))
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SELECT (SELECT sqlserver_start_time FROM sys.dm_os_sys_info) AS SINCE,
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Drive AS DISK_DRIVE,
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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 AS READ_LATENCY,
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CASE
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WHEN io_stall_write_ms = 0 THEN 0
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ELSE (io_stall_write_ms/num_of_writes)
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END AS WRITE_LATENCY,
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CASE
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WHEN (num_of_reads = 0 AND num_of_writes = 0) THEN 0
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ELSE (io_stall/(num_of_reads + num_of_writes))
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END AS GLOBAL_LATENCY,
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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 AS AVG_BYTES_PER_READ,
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CASE
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WHEN io_stall_write_ms = 0 THEN 0
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ELSE (num_of_bytes_written/num_of_writes)
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END AS AVG_BYTES_PER_WRITE,
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CASE
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WHEN (num_of_reads = 0 AND num_of_writes = 0) THEN 0
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ELSE ((num_of_bytes_read + num_of_bytes_written)/(num_of_reads + num_of_writes))
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END AS AVG_BYTES_PER_TRANSFER
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FROM disk_activity AS tab
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ORDER BY GLOBAL_LATENCY
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OPTION (RECOMPILE);
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