gridfs

Name Server Online scalability Performance Hadoop Small files Index GlusterFS None N/remount S Map Y * FastDFS Multiple Y F Y * MogileFS Multiple Y N Y *

Author: (US) Eric Redmond Translator: Wang Haipeng Tian siyuan Wang Chen Press: People's post and telecommunications Press ISBN: 9787115312242 Release Date: June 2013: 16 open pages: 256 versions: Classification of 1-1: Computer> database> more

Compared with relational databases, MongoDB has the following advantages:① Weak consistency (eventual consistency) ensures the user access speed:For example, in a traditional relational database, a COUNT operation locks the dataset to ensure that

Comparison table of operations between MongoDB and MySQL and comparison table of mongodb Comparison tables and differences between MongoDB and MySQL MySQL and MongoDB are both open-source common databases, but MySQL is a traditional relational

2015 China Database Conference Mongodb sharing, 2015 mongodbThis article was shared by MongoDB Greater China technical consultant. When the "old man" came up, he asked what Mongo meant. He guessed the prize and claimed that he was the best MongoDB

I used MongoDB for a while and made some summary for future reference. According to the past habits, let's give a general overview first, and then pick out some of the points that you are more concerned about, as the Pearl River, and explain them in

MongoDB cluster building (master-slave replication, replica and) (5), mongodb master-slaveVi. Architecture ManagementMongodb master-slave clusters are divided into two types:1: master-Slave replication (master-Slave) -- The Slave server will not

Mongodb stores and reads Word documents and mongodbword documents To ensure that printed letters can be restored, You need to record the content of Word letters every time you print a letter. SQL Server can only record the text content of a letter.

This is a creation in Article, where the information may have evolved or changed. Originally from: http://docs.mongodb.org/manual/release-notes/3.0/ March 3, 2015 MongoDB 3.0 is now available for use. Key new features include support for the

The advantages of MongoDB compared to relational databases:① Weak consistency (eventually consistent), to ensure the user's access speed:For example, in a traditional relational database, a count type of operation locks the dataset so that the exact

I. PrefaceNginx Memcached_module module can read the content directly from the memcached server output, subsequent requests are no longer processed by the application, such as PHP-FPM, Django, greatly improve the speed of dynamic pages. Nginx is

Summary of MongoDB common commands simple additions and deletions to check the dataSpecify the display in the query results or do not display a fieldFor example, we want to find all the data in the lessons collection, but we don't want to include

MongoDB uses the Bson format to store data records. Such as:Document structureThe document consists of a key-value pair with the following structure: {Field1:value1,Field2:value2,...Fieldn:valuen}? The value of the field can be any

Count+distinct+groupDatabase command ActionsFixed set propertiesGridfs File SystemSupplementing server-side scriptingDb.runcommand ({group:{ns:"Persons", key:{"Country":true}, Initial:{m:0}, $reduce:function(Doc,prev) {if(Doc.m >prev.m)

1 . ShardsWhat is a shard? Sharding is the storage of data on multiple machines. When the data set exceeds the capacity of a single server, the server's memory and disk IO are problematic, exceeding the performance bottleneck of a single server. At

The data in MongoDB has a flexible pattern. Unlike SQL database, (SQL database) requires that you have to decide and declare a table's schema before inserting the data. The collection of MongoDB does not enforce the structure of the document. This

MongoDB 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 product between a relational database and a

The advantages of MongoDB compared to relational databases:① Weak consistency (eventually consistent), to ensure the user's access speed:For example, in a traditional relational database, a count type of operation locks the dataset so that the exact

First, insert a Bjson data into the databaseThe first is to define the document, then log in with the admin username password, enter the test database, insert this document into the test database ("table name and records in table")Insert results,

Under Windows, MongoDB has only one bin directory and three files outside the bin directory, and the following files are included in the Bin directory:bsondump.exe used to convert the exported Bson file format to JSON formatMongo.exe MongoDB