MongoDB

MongoDB is a scalable, high-performance, open-source NoSQL document database. The main use of C + + development completed. Document-oriented storage, full-index support, replication and high-availability, auto-sharding features. It is the most

MongoDB deployment adopts master-slave mode, the main node is: Peiwo-turn4, from node to Peiwo-proxy1, create deployment User and deployment path, log, data storage pathPerform the following actions on the Peiwo-proxy hostGroupadd MongoDBUseradd-g

MongoDB Delete DocumentIn the previous chapters we have learned how to add data and update data for a collection in MongoDB. In this section we will continue to learn about the deletion of the MongoDB collection.The MongoDB remove () function is

MongoDB Delete Database syntaxThe syntax format for MongoDB database deletion is as follows:DB. Dropdatabase() Delete the current database, which is test by default, and you can use the DB command to view the current database name.InstanceThe

In fact, the official has a detailed installation of the tutorial, if strictly according to the official steps will not appear here the error.Initctl: Unknown Task: Mongod This error is the fourth step in the installation process is less "sudo",

Company database migration, so add a bit of knowledge:1 Import and export of collectionsCommand-line help Mongoexport--helpExportExport Newsserver database under News collectionmongoexport-d newsserver-c News-o D:\data\news.jsonSame as above, but

Backup1. Backups are useful only if you are confident that you can quickly deploy in an emergency situation. So, regardless of which backup technology you choose, be sure to practice the backup and restore operations to know what to do.2. Typically,

mongodb{First, start {# Do not start authentication./mongod--port 27017--fork--logpath=/opt/mongodb/mongodb.log--logappend--dbpath=/opt/mongodb/data/# Start Authentication./mongod--port

Installing the service sideYum Install Mongodb-serverInstalling the ClientYum Install MongoDBVersionMONGO--versionIs MongoDB installed?Which MongodHistory | grep MONGOMkdir-p/data/db/StartMongod--dbpath=/data/db--port=27017Off, also available for

After the operation of MongoDB has a certain foundation, can finally pull the HA and architecture of the two tall concept. Before that, of course you have to figure out the MongoDB key feature:sharding.1. shardingShard is logically a subset of the

1 SummaryIn MySQL, the slow query log is often used as the basis for our query optimization, is there a similar function in MongoDB? The answer is yes, that is to turn on the profiling function. The tool collects writes about MONGODB, cursors,

One, MongoDB index1. Index IntroductionThe index is supported in MongoDB, and if there is no index, MONGODB must scan each document collection to select a matching query record. This makes the collection of scans inefficient because it requires the

Do you encounter performance problems when using MongoDB? Here is a summary of the five steps of MongoDB performance optimization, which I hope will help. First step: Find the slow statement In general, query statements are too slow and performance

MongoDB has a major feature is replication, there are many forms of replication, where master-slave replication is a more common one.Master-slave replication works: first of all to have two or more servers, one of which is the master node,

Installing the MONGODB server1, according to the type of computer system, to the MONGO website to choose the response of the installation package, for:Http://www.mongodb.org/downloadsTake My computer as an example, I downloaded the mongodb-win32-x86_

In MongoDB there is another cluster, that is, sharding technology, similar to the SQL Server table partition, we know that when the amount of data reached the T level, our disk, memoryThat's how we deal with this scenario.One: ShardMongoDB uses a

Today, I would like to share with you the more interesting knowledge of MongoDB, including: aggregation, cursor.One: AggregationCommon aggregation operations are the same as SQL Server: Count,distinct,group,mapreduce. CountCount is the simplest,

1. Enter MongoDB:./bin/mongo ip:30000IP varies by setting2. Create a new database and Shard:Mongos> use 502switched to DB 502mongos> sh.enablesharding ("502") {"OK": 1}View table Status:mongos> sh.status ()---sharding status---...//slightly {

Agenda Traits Agility,scalability,high-performancefree and Open-sourcenosql databasejson-likedocument-oriented database (schema Flexible) Document Database A record in MongoDB was a document, which is a data structure

http://dmyz.org/archives/423When MongoDB suddenly fails to start, the first reaction is to remove Mongod.lock. This file is in the database directory of MongoDB, the default is/data/db. This is the most common problem, due to the fact that MongoDB