Author | Patrick Flynn (@sqllensman) |
Availability | Windows, Linux, macOS |
Want to see the source code for this command? Check out Invoke-DbaDbccDropCleanBuffer on GitHub.
Want to see the Bill Of Health for this command? Check out Invoke-DbaDbccDropCleanBuffer.
Clears SQL Server buffer pool cache and columnstore object pool for performance testing
Executes DBCC DROPCLEANBUFFERS to remove all clean data pages from the buffer pool and columnstore objects from memory. This forces SQL Server to read data from disk on subsequent queries, simulating a "cold cache" environment for accurate performance testing and query optimization scenarios. DBAs use this command when they need to test query performance without the benefit of cached data pages, ensuring consistent baseline measurements across multiple test runs.
Read more:
- https://docs.microsoft.com/en-us/sql/t-sql/database-console-commands/dbcc-dropcleanbuffers-transact-sql
Invoke-DbaDbccDropCleanBuffer
[-SqlInstance] <DbaInstanceParameter[]>
[[-SqlCredential] <PSCredential>]
[-NoInformationalMessages]
[-EnableException]
[-WhatIf]
[-Confirm]
[<CommonParameters>]
PS C:\> Invoke-DbaDbccDropCleanBuffer -SqlInstance SqlServer2017
Runs the command DBCC DROPCLEANBUFFERS against the instance SqlServer2017 using Windows Authentication
PS C:\> Invoke-DbaDbccDropCleanBuffer -SqlInstance SqlServer2017 -NoInformationalMessages
Runs the command DBCC DROPCLEANBUFFERS WITH NO_INFOMSGS against the instance SqlServer2017 using Windows Authentication
PS C:\> 'Sql1','Sql2/sqlexpress' | Invoke-DbaDbccDropCleanBuffer -WhatIf
Displays what will happen if command DBCC DROPCLEANBUFFERS is called against Sql1 and Sql2/sqlexpress
PS C:\> $cred = Get-Credential sqladmin
PS C:\> Invoke-DbaDbccDropCleanBuffer -SqlInstance Server1 -SqlCredential $cred
Connects using sqladmin credential and executes command DBCC DROPCLEANBUFFERS for instance Server1
The target SQL Server instance or instances.
Alias | |
Required | True |
Pipeline | true (ByValue) |
Default Value |
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 |
Suppresses informational messages from the DBCC DROPCLEANBUFFERS command output.
Use this when running automated scripts where you only want to capture errors or when you need cleaner output for logging purposes.
Alias | |
Required | False |
Pipeline | false |
Default Value | False |
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 |
Shows what would happen if the cmdlet runs. The cmdlet is not run.
Alias | wi |
Required | False |
Pipeline | false |
Default Value |
Prompts you for confirmation before running the cmdlet.
Alias | cf |
Required | False |
Pipeline | false |
Default Value |