mongo-shell

I've got a collection consisting of millions of documents that resemble the following: { _id: ObjectId('...'), value: "0.53" combo: [ { h: 0, v: "0.42" }, { h: 1, v: "1.32" } ] } The problem is that the values are stored as strings and I need to convert them to float/double. I'm trying this and it's working but this'll take days to complete, given the volume of data: db.collection.find({}).forEach(function(obj) { if (typeof(obj.value) === "string") { obj.value = parseFloat(obj.value); db.collection.save(obj); } obj.combo.forEach(function(hv){ if (typeof(hv.value) === "string") { hv.value =

Is there's a way to get the size of all the documents that meets a certain query in the MongoDB shell? I'm creating a tool that will use mongodump (see here ) with the query option to dump specific data on an external media device. However, I would like to see if all the documents will fit in the external media device before starting the dump. That's why I would like to get the size of all the documents that meets the query. I am aware of the Object.bsonsize method described here , but it seems that it only returns the size of one document. Here's the answer that I've found: var cursor = db

I just play with mongo shell and came across with Cannot use commands write mode, degrading to compatibility mode . I connected to remote mongo server (mongolab) and tried to insert new record to collection by my simple script: // script.js db = connect(host + ":" + port +"/" + dbName); db.auth(username, password); db.test2.insert({ item: "card", qty: 15 }); I run script by mongo script.js and got: MongoDB shell version: 2.6.3 connecting to: test connecting to: my.mongolab.com:port/DBname Cannot use commands write mode, degrading to compatibility mode What is wrong? Additionally when I

I need to retrieve data from mongoDB using Powershell. Let's say I have db.orders collection and need to retrieve only orders created during last week and retrieve only specific columns for instance _id, status, createdAt fields. Orders collection schema { "_id": ObjectId("56cf9bab78e9fd46ec557d69"), "status" : "ordered", ... "total": 343, "createdAt": ISODate("2016-01-15T17:29:09.342Z") } I can query it in mongo shell like this db.orders.find({ "createdAt" : { $lt: new Date(), $gte: new Date(new Date().setDate(new Date().getDate()-7)) } }, {_id: 1, status: 1, createdAt: 1 }) But I need to do

When doing a research in mongo shell I often write quite complex queries and want the result to be stored in other collection. I know the way to do it with .forEach() : db.documents.find(query).forEach(function(d){db.results.insert(d)}) But it's kind of tedious to write that stuff each time. Is there a cleaner way? I'd like the syntax to be something like db.documents.find(query).dumpTo('collectionName') . Here's a solution I'll use: db.results.insert(db.docs.find(...).toArray()) There is still too much noise, though. UPD : There is also an option to rewrite find using aggregation pipeline.