Shulou(Shulou.com)06/01 Report--

Mongodb does not provide a way to copy collections locally, so you can write a circular insert method to complete mongodb local cloning of a collection data:

Db.source_collection.find () .forEach (function (x) {db.target_collection.insert (x)})

For example, clone all the data in the collection:

Db.userinfo.find () .forEach (function (x) {db.userinfo_bak.insert (x)})

Filter the data of the clone collection:

Repset:PRIMARY > db.user.count ()

850940

Repset:PRIMARY > db.user.count ({iVO 100})

one

Repset:PRIMARY > db.userinfo.find ({iVl100}) .forEach (function (x) {db.user_bak.insert (x)})

Repset:PRIMARY > db.user_bak.count ({iVO 100})

one

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