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<h1 id="compare-dbaagreplicasync">Compare-DbaAgReplicaSync</h1>
<table>
<thead>
<tr>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td><strong>Author</strong></td>
<td>the dbatools team + Claude</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/Compare-DbaAgReplicaSync.ps1">Compare-DbaAgReplicaSync</a> on GitHub.
<br>
Want to see the Bill Of Health for this command? Check out <a href="https://dataplat.github.io/boh#Compare-DbaAgReplicaSync">Compare-DbaAgReplicaSync</a>.</p>
<h2 id="synopsis">Synopsis</h2>
<p>Compares server-level objects across Availability Group replicas to identify synchronization differences.</p>
<h2 id="description">Description</h2>
<p>Compares server-level objects across all replicas in an Availability Group to identify differences that would prevent seamless failover. Availability groups only synchronize databases, not the server-level dependencies that applications need to function properly after failover.</p>
<p>This command reports differences without making any changes, making it ideal for monitoring, alerting, and situations where you need to review differences before deciding how to handle them.</p>
<p>By default, compares these object types across all replicas:</p>
<p>SpConfigure<br />
CustomErrors<br />
Credentials<br />
DatabaseMail<br />
LinkedServers<br />
Logins<br />
SystemTriggers<br />
AgentCategory<br />
AgentOperator<br />
AgentAlert<br />
AgentProxy<br />
AgentSchedule<br />
AgentJob</p>
<p>Any of these object types can be excluded using the -Exclude parameter. The command returns structured data showing what objects are missing or different on each replica.</p>
<h2 id="syntax">Syntax</h2>
<pre><code>Compare-DbaAgReplicaSync
[[-SqlInstance] <DbaInstanceParameter[]>]
[[-SqlCredential] <PSCredential>]
[[-AvailabilityGroup] <String[]>]
[[-Exclude] <String[]>]
[-EnableException]
[<CommonParameters>]
</code></pre>
<p> </p>
<h2 id="examples">Examples</h2>
<p> </p>
<h5 id="example-1">Example: 1</h5>
<pre><code>PS C:\> Compare-DbaAgReplicaSync -SqlInstance sql2016 -AvailabilityGroup AG1
</code></pre>
<p>Compares all server-level objects across replicas in the AG1 Availability Group and reports differences.<br></p>
<h5 id="example-2">Example: 2</h5>
<pre><code>PS C:\> Compare-DbaAgReplicaSync -SqlInstance sql2016 -AvailabilityGroup AG1 -Exclude LinkedServers, DatabaseMail
</code></pre>
<p>Compares server-level objects excluding LinkedServers and DatabaseMail configurations.<br></p>
<h5 id="example-3">Example: 3</h5>
<pre><code>PS C:\> Get-DbaAvailabilityGroup -SqlInstance sql2016 | Compare-DbaAgReplicaSync
</code></pre>
<p>Compares server-level objects for all Availability Groups on sql2016 via pipeline input.<br></p>
<h5 id="example-4">Example: 4</h5>
<pre><code>PS C:\> Compare-DbaAgReplicaSync -SqlInstance sql2016 -AvailabilityGroup AG1 | Where-Object Status -eq "Missing"
</code></pre>
<p>Shows only objects that are missing on one or more replicas.<br></p>
<h3 id="optional-parameters">Optional Parameters</h3>
<h5 id="sqlinstance">-SqlInstance</h5>
<p>The target SQL Server instance or instances. Can be any replica in the Availability Group.<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="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="availabilitygroup">-AvailabilityGroup</h5>
<p>Specifies one or more Availability Group names to compare objects across their replicas.<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="exclude">-Exclude</h5>
<p>Excludes specific object types from comparison. Valid values:<br />
SpConfigure, CustomErrors, Credentials, DatabaseMail, LinkedServers, Logins,<br />
SystemTriggers, AgentCategory, AgentOperator, AgentAlert, AgentProxy, AgentSchedule, AgentJob<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>
<tr>
<td>Accepted Values</td>
<td>AgentCategory,AgentOperator,AgentAlert,AgentProxy,AgentSchedule,AgentJob,Credentials,CustomErrors,DatabaseMail,LinkedServers,Logins,SpConfigure,SystemTriggers</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>
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<th></th>
<th></th>
</tr>
</thead>
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<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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