On the linux shell, run the below.
mongo use opaddress db.dropDatabase() exit /usr/local/omk/bin/opaddress-cli.pl act=setup-db
And that should be all you need to do.
Example console output doing that is below (with added show dbs to show the registered databases along with their sizes).
mark@dev:~$ mongo MongoDB shell version v3.4.24 connecting to: mongodb://127.0.0.1:27017 MongoDB server version: 3.4.24 Server has startup warnings: 2021-10-14T18:10:22.745+1000 I STORAGE [initandlisten] 2021-10-14T18:10:22.745+1000 I STORAGE [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine 2021-10-14T18:10:22.745+1000 I STORAGE [initandlisten] ** See http://dochub.mongodb.org/core/prodnotes-filesystem 2021-10-14T18:10:24.881+1000 I CONTROL [initandlisten] 2021-10-14T18:10:24.882+1000 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2021-10-14T18:10:24.882+1000 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2021-10-14T18:10:24.882+1000 I CONTROL [initandlisten] > show dbs admin 0.000GB local 0.000GB nmisng 0.011GB opaddress 0.004GB > use opaddess switched to db opaddess > db.dropDatabase() { "dropped" : "opaddress", "ok" : 1 } > show dbs admin 0.000GB local 0.000GB nmisng 0.011GB > exit bye mark@dev:~$ /usr/local/omk/bin/opaddress-cli.pl act=setup-db mark@dev:~$ mongo MongoDB shell version v3.4.24 connecting to: mongodb://127.0.0.1:27017 MongoDB server version: 3.4.24 Server has startup warnings: 2021-10-14T18:10:22.745+1000 I STORAGE [initandlisten] 2021-10-14T18:10:22.745+1000 I STORAGE [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine 2021-10-14T18:10:22.745+1000 I STORAGE [initandlisten] ** See http://dochub.mongodb.org/core/prodnotes-filesystem 2021-10-14T18:10:24.881+1000 I CONTROL [initandlisten] 2021-10-14T18:10:24.882+1000 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database. 2021-10-14T18:10:24.882+1000 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted. 2021-10-14T18:10:24.882+1000 I CONTROL [initandlisten] > show dbs admin 0.000GB local 0.000GB nmisng 0.011GB opaddress 0.001GB > exit bye