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Clear-DbaPlanCache.html
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<!DOCTYPE html>
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<title>dbatools docs | Clear-DbaPlanCache</title>
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<h1 id="clear-dbaplancache">Clear-DbaPlanCache</h1>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>Author</strong></td>
<td>Tracy Boggiano, databasesuperhero.com</td>
</tr>
<tr>
<td><strong>Availability</strong></td>
<td>Windows, Linux, macOS</td>
</tr>
</tbody>
</table>
<p> </p>
<p>Want to see the source code for this command? Check out <a href="https://github.com/dataplat/dbatools/blob/master/public/Clear-DbaPlanCache.ps1">Clear-DbaPlanCache</a> on GitHub.
<br>
Want to see the Bill Of Health for this command? Check out <a href="https://dataplat.github.io/boh#Clear-DbaPlanCache">Clear-DbaPlanCache</a>.</p>
<h2 id="synopsis">Synopsis</h2>
<p>Removes ad-hoc and prepared plan caches is single use plans are over defined threshold.</p>
<h2 id="description">Description</h2>
<p>Checks ad-hoc and prepared plan cache for each database, if over 100 MBs removes from the cache.</p>
<p>This command automates that process.</p>
<p>References: <a href="https://www.sqlskills.com/blogs/kimberly/plan-cache-adhoc-workloads-and-clearing-the-single-use-plan-cache-bloat/">https://www.sqlskills.com/blogs/kimberly/plan-cache-adhoc-workloads-and-clearing-the-single-use-plan-cache-bloat/</a></p>
<h2 id="syntax">Syntax</h2>
<pre><code>Clear-DbaPlanCache
[[-SqlInstance] <DbaInstanceParameter[]>]
[[-SqlCredential] <PSCredential>]
[[-Threshold] <Int32>]
[[-InputObject] <Object[]>]
[-EnableException]
[-WhatIf]
[-Confirm]
[<CommonParameters>]
</code></pre>
<p> </p>
<h2 id="examples">Examples</h2>
<p> </p>
<h5 id="example-1">Example: 1</h5>
<pre><code>PS C:\> Clear-DbaPlanCache -SqlInstance sql2017 -Threshold 200
</code></pre>
<p>Logs into the SQL Server instance "sql2017" and removes plan caches if over 200 MB.<br></p>
<h5 id="example-2">Example: 2</h5>
<pre><code>PS C:\> Clear-DbaPlanCache -SqlInstance sql2017 -SqlCredential sqladmin
</code></pre>
<p>Logs into the SQL instance using the SQL Login 'sqladmin' and then Windows instance as 'ad\sqldba'<br>
and removes if Threshold over 100 MB.<br></p>
<h5 id="example-3">Example: 3</h5>
<pre><code>PS C:\> Find-DbaInstance -ComputerName localhost | Get-DbaPlanCache | Clear-DbaPlanCache -Threshold 200
</code></pre>
<p>Scans localhost for instances using the browser service, traverses all instances and gets the plan cache for each, clears them out if they are above 200 MB.<br></p>
<h3 id="optional-parameters">Optional Parameters</h3>
<h5 id="sqlinstance">-SqlInstance</h5>
<p>The target SQL Server instance or instances.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="sqlcredential">-SqlCredential</h5>
<p>Login to the target instance using alternative credentials. Accepts PowerShell credentials (Get-Credential).<br />
Windows Authentication, SQL Server Authentication, Active Directory - Password, and Active Directory - Integrated are all supported.<br />
For MFA support, please use Connect-DbaInstance.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="threshold">-Threshold</h5>
<p>Memory used threshold.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td>100</td>
</tr>
</tbody>
</table>
<h5 id="inputobject">-InputObject</h5>
<p>Enables results to be piped in from Get-DbaPlanCache.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>true (ByValue)</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="enableexception">-EnableException</h5>
<p>By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message.<br />
This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting.<br />
Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td></td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td>False</td>
</tr>
</tbody>
</table>
<h5 id="whatif">-WhatIf</h5>
<p>If this switch is enabled, no actions are performed but informational messages will be displayed that explain what would happen if the command were to run.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td>wi</td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="confirm">-Confirm</h5>
<p>If this switch is enabled, you will be prompted for confirmation before executing any operations that change state.<br></p>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>Alias</td>
<td>cf</td>
</tr>
<tr>
<td>Required</td>
<td>False</td>
</tr>
<tr>
<td>Pipeline</td>
<td>false</td>
</tr>
<tr>
<td>Default Value</td>
<td></td>
</tr>
</tbody>
</table>
<p> </p>
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