MongoDB Repair Problem

Repair command

sudo mongod --dbpath /var/lib/mongodb --repair

{“t”:{"$date":“2022-03-20T18:05:11.071+00:00”},“s”:“W”, “c”:“STORAGE”, “id”:22350, “ctx”:“initandlisten”,“msg”:“Data file is missing. Attempting to drop and re-create the collection.”,“attr”:{“uri”:“table:_mdb_catalog”}} {“t”:{"$date":“2022-03-20T18:05:11.071+00:00”},“s”:“W”, “c”:“STORAGE”, “id”:22353, “ctx”:“initandlisten”,“msg”:“Rebuilding ident”,“attr”:{“ident”:"_mdb_catalog"}} {“t”:{"$date":“2022-03-20T18:05:11.072+00:00”},“s”:“E”, “c”:“STORAGE”, “id”:22435, “ctx”:“initandlisten”,“msg”:“WiredTiger error”,“attr”:{“error”:-31803,“message”:"[1647799511:72009][2120:0x7f6984658cc0], file:WiredTiger.wt, __schema_source_config, 50: metadata information for source configuration “file:_mdb_catalog.wt” not found: WT_NOTFOUND: item not found"}}

“error”:{“code”:4,“codeName”:“NoSuchKey”,“errmsg”:“Unable to find metadata for table:_mdb_catalog”}}} {“t”:{"$date":“2022-03-20T17:55:17.150+00:00”}

Mongo Start Command

sudo mongod --dbpath /var/lib/mongodb

“msg”:“An incomplete repair has been detected! This is likely because a repair operation unexpectedly failed before completing. MongoDB will not start up again without --repair.”

Is this development or other important environment?
It says datafile is missing.You need to check on this
Do you have backups for this DB?
There is no guarantee that after repair your mongod comes up
Did you take a backup of dbpath dir before attempting repair?

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