You can change the number of delete tasks running concurrently by changing the setting on Administration > System. This is useful on systems where you run into errors when deleting multiple versions and projects at the same time causes errors.

Leaving the field empty uses the slots available as defined in the section called “Number of Concurrent Analyses” to launch several deletions in parallel. If you encounter errors when deleting projects, notably ORA-00060 errors when using an Oracle database, setting the parameter to 1 helps reducing the occurrences of these errors.