SQL Server Express is supported for use on an Application Server or Historian node,
but is recommended for use only in small or development configurations. SQL Server
2019 Express Core is automatically installed when you select Application Server (with
the Galaxy Repository selected) or the Historian, if, at time of installation, no
other SQL Server elements are installed on the computer.
The computing capacity of SQL Server Express is limited to the lesser of one CPU socket
or four processor cores.
For InTouch HMI-only installations, SQL Server is no longer a requirement since InTouch
HMI has been reconfigured to work without a Galaxy Repository.