When doing a rebuild I get the error MySQL server has gone away

Increase the MySQL wait_timeout setting.

A Site Studio rebuild can require a long time to process, depending on the content and complexity of your site. On large or complex sites, you may encounter the MySQL server has gone away error during or after the rebuild. If this error appears, refer to the How to override the default MySQL wait_timeout setting user guide for instructions. After you increase the wait timeout, re-run the rebuild process to resolve the error.