commands

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Get-DbaIoLatency

Author Patrick Flynn (@sqllensman)
Availability Windows, Linux, macOS

 

Synopsis

Displays IO subsystem latency statistics from sys.dm_io_virtual_file_stats. Works on SQL Server 2005 and above.

Description

This command is based off of Paul Randal's post "Advanced SQL Server performance tuning"

Returns both raw and aggregate information

Reference: https://www.sqlskills.com/blogs/paul/how-to-examine-io-subsystem-latencies-from-within-sql-server/ https://www.sqlskills.com/blogs/paul/capturing-io-latencies-period-time/

Syntax

Get-DbaIoLatency
    [-SqlInstance] <DbaInstanceParameter[]>
    [[-SqlCredential] <PSCredential>]
    [-EnableException]
    [<CommonParameters>]

 

Examples

 

Example: 1
PS C:\> Get-DbaIoLatency -SqlInstance sql2008, sqlserver2012

Get IO subsystem latency statistics for servers sql2008 and sqlserver2012.

Example: 2
PS C:\> $output = Get-DbaIoLatency -SqlInstance sql2008 | Select-Object * | ConvertTo-DbaDataTable

Collects all IO subsystem latency statistics on server sql2008 into a Data Table.

Example: 3
PS C:\> 'sql2008','sqlserver2012' | Get-DbaIoLatency

Get IO subsystem latency statistics for servers sql2008 and sqlserver2012 via pipline

Example: 4
PS C:\> $cred = Get-Credential sqladmin
PS C:\> Get-DbaIoLatency -SqlInstance sql2008 -SqlCredential $cred

Connects using sqladmin credential and returns IO subsystem latency statistics from sql2008

Required Parameters

-SqlInstance

The SQL Server instance. Server version must be SQL Server version 2008 or higher.

Alias
Required True
Pipeline true (ByValue)
Default Value

Optional Parameters

-SqlCredential

Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential). Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported. For MFA support, please use Connect-DbaInstance.

Alias
Required False
Pipeline false
Default Value
-EnableException

By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message. This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting. Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.

Alias
Required False
Pipeline false
Default Value False

 

Want to see the source code for this command? Check out Get-DbaIoLatency on GitHub.
Want to see the Bill Of Health for this command? Check out Get-DbaIoLatency.