While upgrading from Mysource Matrix 3.20.2 to 3.22.1 you need to turn off and clear the cache from the system.
Unfortunately, if you are running a large system you may not have the memory allocation to perform the system wide clear cache option that can be found under the System Management – Cache Manager – Clear Cache section in the back end.
There is an easier solution though, and for those that have ssh access to their systems I can say it is a much simpler way to clear mysource matrix cache.
SSH into your system and type the following:
psql -U postgres -d DBNAME -c “TRUNCATE sq_cache;”