# Maintenance Window

The maintenance window is a weekly four-hour window. All changes that may cause service interruptions, such as version upgrades, are executed within the maintenance windows.

During the maintenance window, uncontrolled disconnections and an inability to connect to the cluster can happen. Such disconnections are destructive for any ongoing transactions, and clients should also reconnect.

### Maintenance window configuration

The maintenance window consists of the following:

* The day of the week to conduct maintenance.
* The expected time to complete the maintenance activity.

Here is an example of a maintenance window configuration:

```
"maintenanceWindow": {
      "time": "15:39:01",
      "dayOfTheWeek": "Friday"
    }
```

For more information, see [<mark style="color:blue;">Set Up a PostgreSQL Cluster</mark>](/cloud/databases/postgresql/api/v1-api/create-a-database.md).


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