mongodump “Failed: bad option: can only dump a single collection to stdout”

问题

mongodump --out "-" 

doesn't work, it gives me this message : "Failed: bad option: can only dump a single collection to stdout". What happens ?...

回答1:

so the exception is self-explanatory that if you use --out "-" it can show only single collection on stdout.

So i would like to know as to what you want to achieve?

if you want to stdout a particular collection command is :

mongodump -o - -d <dbname> -c <collection name>

if you want to take dump of whole mongodatabase ideal command is:

mongodump --gzip --archive=db.tar

来源：https://stackoverflow.com/questions/52540104/mongodump-failed-bad-option-can-only-dump-a-single-collection-to-stdout