commands

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Get-DbaLatchStatistic

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

 

Synopsis

Displays latch statistics from sys.dm_os_latch_stats

Description

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

Returns: LatchClass WaitSeconds WaitCount Percentage AverageWaitSeconds URL

Reference: https://www.sqlskills.com/blogs/paul/advanced-performance-troubleshooting-waits-latches-spinlocks/ https://www.sqlskills.com/blogs/paul/most-common-latch-classes-and-what-they-mean/

Syntax

Get-DbaLatchStatistic
    [-SqlInstance] <DbaInstanceParameter[]>
    [[-SqlCredential] <PSCredential>]
    [[-Threshold] <Int32>]
    [-EnableException]
    [<CommonParameters>]

 

Examples

 

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

Check latch statistics for servers sql2008 and sqlserver2012

Example: 2
PS C:\> Get-DbaLatchStatistic -SqlInstance sql2008 -Threshold 98

Check latch statistics on server sql2008 for thresholds above 98%

Example: 3
PS C:\> $output = Get-DbaLatchStatistic -SqlInstance sql2008 -Threshold 100 | Select-Object * | ConvertTo-DbaDataTable

Collects all latch statistics on server sql2008 into a Data Table.

Example: 4
PS C:\> 'sql2008','sqlserver2012' | Get-DbaLatchStatistic

Get latch statistics for servers sql2008 and sqlserver2012 via pipline

Example: 5
PS C:\> $cred = Get-Credential sqladmin
PS C:\> Get-DbaLatchStatistic -SqlInstance sql2008 -SqlCredential $cred

Connects using sqladmin credential and returns latch statistics from sql2008

Example: 6
PS C:\> $output = Get-DbaLatchStatistic -SqlInstance sql2008
PS C:\> $output
PS C:\> foreach ($row in ($output | Sort-Object -Unique Url)) { Start-Process ($row).Url }

Displays the output then loads the associated sqlskills website for each result. Opens one tab per unique URL.

Required Parameters

-SqlInstance

The SQL Server instance. Server version must be SQL Server version 2005 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
-Threshold

Threshold, in percentage of all latch stats on the system. Default per Paul's post is 95%.

Alias
Required False
Pipeline false
Default Value 95
-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-DbaLatchStatistic on GitHub.
Want to see the Bill Of Health for this command? Check out Get-DbaLatchStatistic.