---
title: Disable the master database on CD servers
slug: '2268'
canonical_url: https://docs.coveo.com/en/2268/
collection: coveo-for-sitecore-v5
source_format: adoc
---
# Disable the master database on CD servers
Sitecore 9 introduced rules based configuration.
This approach lets you define the server `role` in the Sitecore `web.config` file and subsequently apply configurations on a per-role basis.

In our multi-CM, multi-CD server example setup, this implies that you have already included the following line in the `web.config` files of your CD servers:

```xml
<add key="role:define" value="ContentDelivery" />
```

Coveo for Sitecore leverages the server role out of the box when applying configurations through `role:require` attributes.
Index-related operations are therefore disabled on CDs in the `<SITECORE_INSTANCE_ROOT>\App_Config\Modules\Coveo\Coveo.SearchProvider.config` file as follows:

```xml
<configuration>
    <indexes hint="list:AddIndex">
        <index role:require="!ContentDelivery" id="Coveo_master_index" type="Coveo.SearchProvider.ProviderIndex, Coveo.SearchProvider" patch:before = "*[1]">
```

```xml
<scheduling>
    <agent role:require="!ContentDelivery" name="CoveoSynchronizeTopResults" type="Coveo.SearchProvider.Agents.SynchronizeTopResults, Coveo.SearchProviderBase" method="Run" interval="00:01:00">
        <DatabasesToSynchronize>master;web</DatabasesToSynchronize>
    </agent>
```