MV Refresh - Changing between on commit to on demand and back

Hello

we have a 19.18 E.E RAC database

We have a MV created with

REFRESH FAST ON COMMIT
WITH ROWID
ENABLE QUERY REWRITE….

We have a batch job that runs updates on the underlying table that runs for hours and we are seeing Enq JI contention waits and tx locks etc. While we are working on fixing that update batch job we are thinking about disabling the refresh of MV while the job is running and then enable it back

So basically

before the job kicks in, change the refresh to on demand and then once the job is finished change it back to on commit