Is it possible to mongodump the last “x” records from a collection?

Question

Can you use mongodump to dump the latest \"x\" documents from a collection? For example, in the mongo shell you can execute:

db.stats.find().sort({$natural:-1}).         


        

Answer 1

try this:

NUM=10000    
doc=selected_doc
taskid=$(mongo 127.0.0.1/selected_db -u username -p password --eval "db.${doc}.find({}, {_id: 1}).sort({_id: -1}).skip($NUM).limit(1)" |  grep -E  -o '"[0-9a-f]+"')
mongodump --collection $doc  --db selected_db --host 127.0.0.1 -u username -p password -q "{_id: {\$gte: $taskid}}" --out ${doc}.dump