The performance of large Windows Server Update Services (WSUS) deployments will degrade over time if the WSUS database is not maintained properly. The WSUSDBMaintenance script is a T-SQL script that can be run by SQL Server administrators to re-index and defragment WSUS databases. It should not be used on WSUS 2.0 databases.This script contributed by the Microsoft WSUS team.
If you are using Windows Internal Database, you will need to use the sqlcmd utility, which can be downloaded from docs.microsoft.com page for SQLCMD. This page will also contain additional information about the sqlcmd utility.
To use this script with Windows Internal Database, you should run the following command:
sqlcmd -S np:\\.\pipe\MSSQL$MICROSOFT##WID\sql\query –i <scriptLocation>\WsusDBMaintenance.sql