MongoDB

Problem Description:In a production environment, you can relieve stress by adding new secondary replica members when the read pressure of a secondary replica member is large.In order to achieve the primary replica member non-stop, and reduce the

MongoDB is a product between relational and non-relational databases, most like relational databases in non-relational databases. Supports an object-oriented query language that can achieve almost the most functionality of a relational database

1, Replication IntroductionMongoDB replication is the replication of data in multiple servers, the purpose of data replication is to provide redundancy and improve the availability of data, the operation of data replication on different database

MongoDB installation under Windows, start to view previous: MongoDB installation detailedI. Log in to view the collection document in the database database add a document , modify the document, delete the document1. See which databases are

This paper mainly introduces the simulation of MONGO shards on a win7 computer . If you have more than one server, you can deploy each MONGO on a single computer. We will configure 3 MONGO shards,3 configuration servers,1 A routing server. As

Remove () methodThe Remove () method of MongoDB is used to remove a document from the collection. The Remove () method accepts two parameters. The first one is to delete the criteria, the second is the JUSTONE flag: Deletion criteria:

Let's take a look at the MongoDB copy Database Copydatabase ().To achieve the method of freeing disk space, I hope the article will help you.Db.copydatabase ("from", "to", "127.0.0.1:16161"); The From library on the 127.0.0.1. Copy to the to library.

Run the following command first to start the MONGO servermongod run --config /usr/local/etc/mongod.confAssuming you installed MONGO using Brew.More information on the Mongod process hereEDITTry to repair MONGO using:mongod --repairSeems to has

The text is as follows:#日期serial number is browsed page URL x page visitor IP Access time whether portal operating system browser language time zone screen resolution screen color digit number province whether the internet site of the city access

First, Introduction Our last article introduced Db.collection.find () can be implemented based on conditional queries and specifying fields returned using the projection operator omit this parameter to return all fields in the matching document, we

Download Pymongo-2.6.3.win-amd64-py2.7.exe on the Python website Installing Pymongo-2.6.3.win-amd64-py2.7.exe Test with the official use case Open a command prompt and enter the Python runtime environment. Import Pymongo Module>>>

Set up common set db.createcollections AAA; Fixed set name book capped true fixed collection size Max: Number of documents Db.createcollection ("book", {capped:true, Size:10000,max:5}) "capped": false, indicates normal collectionNormal collections

Recently encountered in the work of this problem, in the software development process itself in the test server to create a MongoDB database, all the development work is very smooth, but to go online, you need to provide a running script to ensure

The 1th chapter of MongoDB installation(Dawn Hello original works, reproduced please specify)1.1 MongoDB IntroductionMongoDB is a database open source project based on distributed file storage. Written in the C + + language, it is designed to

MongoDB3.0 permission, nothing to say, Google Baidu out of all is wrong. Install the blind ditch first, simply can't say.First, start MongoDB without using the -auth parameter: mongodb-linux-i686-3.0. -F mongodb-linux-i686-3.0.

One, download1. Official website: http://www.mongodb.org/; the address for the download installer is: http://www.mongodb.org/downloads, select the Windows 32-bit 2.4.0 version.2. Download the MongoDB for. NET Driver Development Kit, the official

The following articles mainly describe how to correctly execute DB2 commands. If you encounter DB2 commands in actual operations, but you do not know how to solve them correctly, so the following articles must be good teachers and friends for you.

Database-integrity restrictions in triggers and DomainsDomain integrity restrictions SQL supports the concept of DOMAIN, and can use the CREATE DOMAIN statement to CREATE a DOMAIN and the integrity constraints that the DOMAIN should meet. [Example 14

Database creation backup and restoration for DB2 Databases Follow these steps to create a database in the Db2 environment: 1. When su-db2inst is missing, an error will occur; 2. db2 enters the db2 command line mode; 3. create database pb_db on/home/

The so-called data backup is to retain a backup system, when the operating system fails, the original data can be restored with the minimum time. Database Backup can be a copy of the entire database, or a copy of one or more tablespaces of some of