MongoDB

MongoDB is currently ranked the highest non-relational database (currently ranked fourth), as the first document-type database, involving some of the original concepts and terminology, in order to understand MongoDB, need to understand these

some concepts and details of shardingPrimary ShardThere is a concept of primary and secondary in the replica set, so there is a primary concept in sharding.Any one mongodb has an unpartitioned whole DB collection in one shard. Such as.Collection1 in

Information about MongoDB is now less, and most of the English site, most of the above content by the author translated from the official website, please translate or understand the error point please testify. After that I will continue to focus on

Today, when editing the function of the article found a problem, edit and save the completion of the current article to jump to the address, the results of 404, the break point found when the query database Mongodb.open method failure. Baidu after

When MongoDB is inserting or updating data, if a sudden power outage or irreversible devastating event occurs, MongoDB does not provide a mechanism for a relational database like Oracle or SQL Server, so it generates garbage data. But MongoDB

Shards can add more machines to cope with increasing load and data without impacting applications. Sharding (sharding) is the splitting of data and spreading it across different machines without the need for powerful mainframe computers to store

Super User-Related: use admin #增加或修改用户密码 db.adduser (Ixigua, ' pwd ') #查看用户列表 db.system.users.find () #用户认证 Db.auth (Ixigua, ' pwd ') #删除用户 db.removeuser (' MongoDB ') #查看所有用户 Show

Brief introductionMongoDB is a database based on distributed file storage. Written by the C + + language. Designed to provide scalable, high-performance data storage solutions for Web applications. MongoDB is a high-performance, open-source,

MongoDB is a product between a relational database and a non-relational database, and is the most versatile and most like relational database in a non-relational database. The data structure he supports is very loose and is a JSON-like Bson format,

First download the Mongdb Zip package, you can go to: http://www.mongodb.org/downloads. Select 32-bit or 64-bit.Create a MongoDB folder on the D disk, D:\mongodb. Copy all the contents of the extract into the folder. and create the Data folder under

When you perform an update operation on MongoDB in C + +, if the Upsert parameter is set to True, the nonexistent data is automatically inserted. In high concurrency environments, data duplication can result.The workaround is to add a unique index

First download MongoDB, website address: https://www.mongodb.org/downloadsThe official website address may download is slow, so provides me to download the file: http://pan.baidu.com/s/1eQhDtL4, the current official latest stable version is: 2.6.7,

DescribeCurrently to do is a number of servers on the program log (such as the order journal, the transaction log, the interface is successful, etc.) summarized to 1 MongoDB server, daily about 100 million of the volume, and then a real-time chart

After the Replica set is configured, you will not be able to sync after you have enabled the AUTH option, which steps should be missing from the authentication section.Later found that the configuration is less keyfile, so it generates a.KeyFile In

MongoDB has not found a dedicated method to find the maximum value, but can be sorted and take the first one instead.The following collection data is as follows:{"_id": ObjectId ("54c39358acace71b1bd20a70"), "Epoch_min": Numberlong (1422030840),

1. Start a new shard Server process[Email protected] ~]# mkdir/data/shard/~]#/apps/mongo/bin/mongod--shardsvr--port 20002--dbpath/data/ shard/S2--fork--logpath/data/shard/log/s2.log--/data/shard/log/67722. Configuring the new Shard Server[[email

1. introduction of the index :Monggodb 's index is also a balanced binary tree , so most of the index optimization techniques in traditional databases are also available .Note : MongoDB can traverse the data in any direction ( This is not the same

First, Data controlMongoDB operation of data volume control, do not control, because the operation of the data volume is too large to cause failure.Demonstrate the error message that occurs with this type of error:Implementation of multi-table

http://docs.mongodb.org/meta-driver/latest/legacy/feature-checklist-for-mongodb-drivers/1. Basic (Essential)-Bson Serialization/deserialization-Basic Operation: query, INSERT, UPDATE, remove, Ensureindex, FindOne, limit, sort-Get more data from the

1. Download:Mongodb.org/download2. Compress the downloaded compressed file to/usr/lib3. Create a soft linkLn-s/usr/lib/mongodb-linux-i686-2.6.7/bin/mongod/usr/bin/mongodln-s/usr/lib/mongodb-linux-i686-2.6.7/bin/mongo /usr/bin/mongoThis allows the