> db.source_collection.find().forEach( function(x){db.collection_copy.insert(x)} ); 移动: 1 2 3 > use admin switched to db admin > db.runCommand({renameCollection: 'db1.source_collection', to: 'db2.target_collection'}) // who'd think rename could move? 其他答案更适合于复制集合,...
在使用db.collection.copyTo()时检查字段类型以验证该操作不会在 BSON 到 JSON 转换期间从文档中删除类型信息。 在内部,db.collection.copyTo()方法使用 eval 命令。 因此,db.collection.copyTo()操作采用全局锁定,这会阻止任何其他读取或写入活动,直到db.collection.copyTo()操作完成。 复制的文档数由copyTo()返回。
您的代码示例的问题是find()将database cursor返回到集合，而不是返回集合中的所有文档。因此，当您从h...
A collection in MongoDB is a group of documents, similar to a table in a relational database management system (RDBMS) or SQL database. MongoDB’s flexible schema allows documents within the same collection to have varying structures. This means that documents in a collection don’t need to...
Example: Script all collections in the database db1 on the server myserver1.source_connection = "mongodb://myserver1/db1" include_collections = ("*")About A utility to copy indexes from one DB to another, by generating an index creation script. Resources Readme License MIT license ...
Java Copy { item: "ABC1", details: { model: "14Q3", manufacturer: "XYZ Company" }, stock: [ { size: "S", qty: 25 }, { size: "M", qty: 50 } ], category: "clothing" } MongoDB stores documents in groups known as a collection. MongoDB does not impose any restriction on...
collection.h" #include "mongo/db/catalog/collection_catalog.h" #include "mongo/db/catalog/collection_options.h" #include "mongo/db/catalog/database.h" #include "mongo/db/catalog/database_holder.h" #include "mongo/db/catalog/index_catalog.h" #include "mongo/db/catalog_raii.h" #include "...
We are using Azure Data Factory to move a non-prod collection from one Azure Cosmos DB for Mongo DB to another in the same resource group. The are both RU-based resources. I was able to use the "Ingest" template to create a simple pipeline with a single Copy step that was succe...
using System; using MongoDB.Driver; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { Mongo db = new Mongo(); db.Connect(); //Connect to localhost on the default port. Database test = db.getDB("test"); IMongoCollection things = test.Ge...
MongoDB uses multi-granularity locking [1] that allows operations to lock at the global, database or collection level, and allows for individual storage engines to implement their own concurrency control below the collection level (e.g., at the document-level in WiredTiger)....