ArangoDB v3.10 is under development and not released yet.
This documentation is not final and potentially incomplete.
ArangoDB Server Temp Options
Path for temporary files. ArangoDB will use this for storing temporary files, for extracting data from uploaded zip files (e.g. for Foxx services) and other things. Ideally the temporary path is set to an instance-specific subdirectory of the operating system’s temporary directory. To avoid data loss the temporary path should not overlap with any directories that contain important data, for example, the instance’s database directory.
If the temporary path is set to the same directory as the instance’s database directory, a startup error will be logged from ArangoDB v3.4.8 onwards. ArangoDB v3.5 and higher will additionally abort the startup with such configuration.