mongo delete from collection

first, three components of the cluster:MONGOs (query routers): Queries the route, takes care of the client connection, assigns the task to shards, and then collects the results. Config server: Configures the servers, saves the metadata information

IntroductionThe MONGO Shell is a interactive JavaScript interface to MongoDB. You can use the MONGO Shell to query and update data as well as perform administrative operations.The MONGO Shell is a component of the MongoDB distributions. Once you has

After you stop balancer, back up the entire Shard library, and then enable balancer to delete the Shard set merge rebuild. Encountered the following error:Mongos> Db.businessInfo.drop ();2016-08-14t09:06:58.324+0800 E QUERY Error:drop failed: {"Code"

Mongo management and mongo management toolsMongo Management Based on ipv3.0, and 2.x versions may not be the same in some places.Install source (ubuntu) echo "deb http://repo.mongodb.org/apt/ubuntu "$(lsb_release -sc)"/mongodb-org/3.0 multiverse" |

The production environment uses the MONGO database.Long-coveted for the MONGO database, its high performance/open source/modeless/document-based database/... What a tempting feature, also occasionally tossing and playing, but did not make notes,

In the real world, everything has two sides, in the process of the world, and so on! Whether we are in the use of a new language, or a new technology, in the understanding of how exciting it is, make people relaxed, all of the excellent as for, it

Mongo server cluster configuration Learning 1. Master-slave replication is the most common and simple replication operation for MongoDB. It is often used for data backup and troubleshooting. The following figure shows the simplest server

Installation steps under CentOS via Yum are as follows:statement: Compared to those with the source code installed, less configuration and new log and data directory, this simple and rude, 1 , create a warehouse file, vi /etc/yum.repos.d/

Mongo client Common commands 1. database related commands 1showdbs list all databases 2usememo Use Database memo. Even if the database does not exist, it can be executed, but the database will not be created immediately. The database will be created

[MongoDB] building a Mongo database replica set (similar to a cluster) on the windows platform (III), mongodbmongo I have written two blogs about how to build a Mongo database replica set on windows. Article 1: How to build a Mongo database replica