Hi,
I want to use the same DB which is in 3.4 moodle version, to 3.9. Is this cause any issue? if means what type of issue will be occur?
For that what need to be done. Please provide the suggestions.
Thanks
You can start with the 3.4 database, but when you apply the 3.9 code, it will trigger the upgrade needed.
You can't run the two versions of Moodle off the same database tables.