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                    <h1 id="test-dbadbquerystore">Test-DbaDbQueryStore</h1>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>Author</strong></td>
<td>Jess Pomfret (@jpomfret), jesspomfret.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/Test-DbaDbQueryStore.ps1">Test-DbaDbQueryStore</a> on GitHub.
<br>
Want to see the Bill Of Health for this command? Check out <a href="https://dataplat.github.io/boh#Test-DbaDbQueryStore">Test-DbaDbQueryStore</a>.</p>
<h2 id="synopsis">Synopsis</h2>
<p>Compares Query Store settings against best practices.</p>
<h2 id="description">Description</h2>
<p>Evaluates Query Store against a set of rules to match best practices. The rules are:</p>
<ul>
<li>ActualState = ReadWrite (This means Query Store is enabled and collecting data.)</li>
<li>DataFlushIntervalInSeconds = 900 (Recommended to leave this at the default of 900 seconds (15 mins).)</li>
<li>MaxPlansPerQuery = 200 (Number of distinct plans per query. 200 is a good starting point for most environments.)</li>
<li>MaxStorageSizeInMB = 2048 (How much disk space Query Store will use. 2GB is a good starting point.)</li>
<li>QueryCaptureMode = Auto (With auto, queries that are insignificant from a resource utilization perspective, or executed infrequently, are not captured.)</li>
<li>SizeBasedCleanupMode = Auto (With auto, as Query Store gets close to out of space it will automatically purge older data.)</li>
<li>StaleQueryThresholdInDays = 30 (Determines how much historic data to keep. 30 days is a good value here.)</li>
<li>StatisticsCollectionIntervalInMinutes = 30 (Time window that runtime stats will be aggregated. Use 30 unless you have space concerns, then leave at the default (60).)</li>
<li>WaitStatsCaptureMode = ON (Adds valuable data when troubleshooting.)</li>
<li>Trace Flag 7745 enabled</li>
<li>Trace Flag 7752 enabled</li>
</ul>
<h2 id="syntax">Syntax</h2>
<pre><code>Test-DbaDbQueryStore
    [[-SqlInstance] &lt;DbaInstanceParameter[]&gt;]
    [[-SqlCredential] &lt;PSCredential&gt;]
    [[-Database] &lt;Object[]&gt;]
    [[-ExcludeDatabase] &lt;Object[]&gt;]
    [[-InputObject] &lt;Object[]&gt;]
    [-EnableException]
    [&lt;CommonParameters&gt;]

</code></pre>
<p> </p>
<h2 id="examples">Examples</h2>
<p> </p>
<h5 id="example-1">Example:  1</h5>
<pre><code>PS C:\&gt; Test-DbaDbQueryStore -SqlInstance localhost
</code></pre>
<p>Checks that Query Store is enabled and meets best practices for all user databases on the localhost machine.<br></p>
<h5 id="example-2">Example:  2</h5>
<pre><code>PS C:\&gt; Test-DbaDbQueryStore -SqlInstance localhost -Database AdventureWorks2017
</code></pre>
<p>Checks that Query Store is enabled and meets best practices for the AdventureWorks2017 database on the localhost machine.<br></p>
<h5 id="example-3">Example:  3</h5>
<pre><code>PS C:\&gt; Test-DbaDbQueryStore -SqlInstance localhost -ExcludeDatabase AdventureWorks2017
</code></pre>
<p>Checks that Query Store is enabled and meets best practices for all user databases except AdventureWorks2017 on the localhost machine.<br></p>
<h5 id="example-4">Example:  4</h5>
<pre><code>PS C:\&gt; $databases = Get-DbaDatabase -SqlInstance localhost
PS C:\&gt; $databases | Test-DbaDbQueryStore
</code></pre>
<p>Checks that Query Store is enabled and meets best practices for all databases that are piped on the localhost machine.<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="database">-Database</h5>
<p>The database(s) to process. This list is auto-populated from the server. If unspecified, all user databases will be processed.<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="excludedatabase">-ExcludeDatabase</h5>
<p>The database(s) to exclude. This list is auto-populated from the server.<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="inputobject">-InputObject</h5>
<p>Enables piped input from Get-DbaDatabase.<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 &quot;sea of red&quot; exceptions, but is inconvenient because it basically disables advanced scripting.<br />
Using this switch turns this &quot;nice by default&quot; 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>
<p> </p>

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