mongodb migrate data

I. INTRODUCTIONMany people complain that mongodb is a memory database and has no transactions and may be insecure. In fact, this is a misunderstanding of Mongodb. Mongodb has a complete redolog, binlog, and persistence mechanism, do not worry too much about data loss.Journal is the redo log in

I. Basic Concepts 1. Document: MongoDB is a Document-based NoSQL database. A document is the basic unit of data in MongoDB and is very similar to rows in relational databases (more complex than rows ). A document consists of multiple key pairs that have the following features: a. The key pairs in the document are ordered (usually the order of the key keys in the

Def getmydatalist ():#id这个keykey = str (U ' ID '). decode (' Utf-8 ')#存储旧数据的id列表Old_ids = []#存储新微博的列表EXTR_WB = []#从MongoDB上获取的数据Old_datalist = Weibodata.find ()For-old in old_datalist:Old_ids.append (Old[key])#从微博上抓取新数据data = Client.statuses.home_timeline.get ()New_datalist = data.statusesFor new in New_datalist:If New[key] not in Old_ids:Extr_wb.append (New)Weibodata.insert (Extr_wb,save=true)Ideas:1. Firs

Recently consider using Hadoop mapreduce to analyze the data on MongoDB, from the Internet to find some demo, patchwork, finally run a demo, the following process to show youEnvironment Ubuntu 14.04 64bit Hadoop 2.6.4 MongoDB 2.4.9 Java 1.8 Mongo-hadoop-core-1.5.2.jar Mongo-java-driver-3.0.4.jar Download and configuration of Mong

Tags: role file root str man bin task IDF MongodMongoDB data backup script and log cut script1. Login MONGOMONGO--port=270182. Create an Administrative user:db.createUser(... {... user: "root",... pwd: "Zytest2233",... roles: [ { role: "root", db: "admin" } ]... }... )3. Turn on authentication:[[emailprotected] scripts]# cat /usr/local/mongodb/mongod.cnf logpath=/

MongoDB is a popular nosql software. It has released versions on Windows Linux Mac platform. After testing, the efficiency is still very good, but the memory consumption is very high because mapviewoffile is used, that is, the hard disk data is mapped directly to the memory, so the entire memory needs to be loaded (http://www.cnblogs.com/daizhj/archive/2011/04/25/mongos_mmap_source_code.html ). Memory monit

Original: HTTP://CODECAMPO.COM/TOPICS/66The day before yesterday saw Javaeye plan to use MongoDB to implement the website of the whole station message system, very sympathetic, MongoDB is very suitable for storing message class data. We discussed how to build a micro-BO broadcast, this time to discuss how to store the message/reminder class data.The following con

Tags: http io ar os using SP Java file dataFirst, prefaceIn fact, the previous project group has also used MongoDB, only then as the main database to use, so the framework will be more complex, such as the use of JPA, if only to use MongoDB as an attached database, Individuals think that the database can be manipulated by Spring-data-

Tags: important IDT sel medium padding Architecture design Code contains complexMySQL has always been the most cost-effective relational database model MongoDB brings a NoSQL experience outside the relational database. Let's look at a simple example of how we will create a data structure for MySQL (or any relational database) and MongoDB. MySQL Design Let's assum

Tags: mongodb nosqlThis blog post mainly studies data update operations for document in MongoDB. Includes the data "Insert", "Update" and "delete".Document Data InsertionThe command to insert a piece of data into the document file

MongoDB uses Flexgrid's simple data to present this example. This example uses the commonly used: User, post, comment as the basic model to implement a simple Demo of MongoDB's combination of Flexgrid data presentation. Due to time limitations, the function only provides common query operations (paging, sorting, and query) for

Tags: MongoDB document database embedded NoSQL database OAMongoDB is a scalable, high-performance, distributed document storage database, written in C, designed to provide scalable, high-performance data storage solutions for Web applications. It is characterized by high performance, easy to deploy, easy to use, and easy to store data.Mongo DB is a non-relational database (NOSQL) that is currently very popu

Tags: array now name delete parameter multi build database integer Linupdating and deleting data in the MongoDB database In the MongoDB database, you can use the Update method of the collection object to update the data document in the collection. Use the following method: Collection.update (selector, document, [option

Tags: namespace OS swap partition cache memory Map file method CTI PolicyOriginal address: http://www.cnblogs.com/foxracle/p/3421893.html To learn more about how MongoDB stores data, one concept must be clear, and that is memeory-mapped Files. memeory-mapped Files Shows how the database deals with the underlying system. A memory-mapped file is an OS that creates a

MongoDB (BSON) Data Type In addition to the basic JSON types: string, integer, boolean, double, null, array, and object, mongo also uses special data types. These types include date, object id, binary data, regular expression, and code. Each driver implements these types in a specific language. view your driver documen

Migrate data from an existing MongoDB replica set to a new shard cluster and design three migration scenarios. Scenario One: Synchronize the data first, then set up the Shard cluster, and finally configure the Shard cluster. export the data that needs to be migrated, set

MongoDB data is particularly flexible. Compared with SQL databases, it does not need to define the table structure before inserting data. MongoDB collections do not emphasize fixed document structures. This flexibility MongoDB data