In the Restructure Database dialog box, you can select or clear the “Restructure in the background” option.
If you select the option:
You can continue working as the restructure processes.
You can exit the console.
You cannot shut down Essbase Administration Server until the restructure is completed.
A process ID is displayed.
You can use the process ID to track the status in the Background Process Status window.
“Optimizing Database Restructuring” in the Oracle Essbase Database Administrator's Guide
alter database (MaxL) in the Oracle Essbase Technical Reference