MongoDB

Let's start with a few commands about MongoDB:1. Create User Db.adduser (' username ', ' password ');2. Query the current library user information db,system.users.find ();3. Enter the response database use DatabaseName;4. Displays the size

About NoSQL1.1 System-to-data requirementsNosql[nosql main use Big data processing] all called "Not only SQL", for non-relational database [non-relational database is a relational database all features are not, the primary foreign key, constraints

Nodejs operation MongoDB can use Mongoose:Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment.Install Mongoose:NPM Install MongooseGet MongoDB Connectionvar conn = mongoose.connect (' mongodb://localhost/mytest

1. Connect to the Linux system first.2. Download the appropriate MongoDB install compression package to the MongoDB website.Download page: Https://www.mongodb.org/downloads#production.Here i download the Linux 64-bit legacy:

Some time recently, I have been working on MongoDB, I used to use a relational database, such as Oracle, MySQL, for MongoDB is only a little superficial understanding, recently determined to do a good study, the main reference books have two:

In the recent work need to use MongoDB, here to do some simple records, blog post content can be found in the official MongoDB reference manual, here is just a few summary and explanation.Installation Environment:Os:windows 7, 32-bitmongodb:3.0.6,

---1. Turn off Numa in procRpm-qa | grep numactlYum Install-y Numactl# echo 0 >/proc/sys/vm/zone_reclaim_mode# sysctl-w Vm.zone_reclaim_mode=0---2. Modify the maximum number of connections#vi/etc/security/limits.conf* Soft Nofile 25000* Hard Nofile 2

MongoDB Add user in v3.0 Problem Resolution (property ' AddUser ' of object Admin was not a func) #problem: An error occurred while creating a MongoDB account> Db.adduser (' Jyu ', ' aerohive ')2015-08-05t20:03:02.767+0800 E QUERY typeerror:property

Nutch2.3Nutch was born in August 2002 and is a Java-implemented open source search engine project by Apache, Since the Nutch1.2 version, Nutch has evolved from a search engine to a web crawler, then nutch further evolved into two major branches: 1.X

MongoDB paging is very simple, this article mainly talk about the problems of paging, as well as the optimization scheme From the traditional web to the mobile API, we all face the same problem, such as Ajax get size display, etc., will force you to

Import and export use HNDB;Db.s.save ({name: ' John Doe ', age:18,score:80,address: ' Zhengzhou '});d B.s.save ({name: ' Lie Triple ', age:8,score:50,address: ' Zhengzhou '}); Db.s.save ({name: ' Zhang San ', age:38,score:20,address: ' Tianjin ');d

Organize fromHttps://www.shiyanlou.com/courses/running/77Initializing the MongoDB database>Use chenshiswitched to DB chenshi> db.createcollection ("Shiyanlou")#无参数 {"OK":1}> Show CollectionsshiyanlouSystem.indexes> userdoc1=

inserting insertThe data structure of the MongoDB document is basically the same as JSON. All data stored in the collection is in the Bson format. Bson is a binary form of a class JSON storage format, referred to as binary JSON.First we select the

C:~ lsg$ Cat. Bash_profilec:~ lsg$ vim. Bash_profile---Modify this filePress I to modify a fileShift+z+z Saving changesAdd the following codeExport Clicolor=1Export svn_editor= '/usr/bin/vim 'Alias smeteor= ' cd/users/lsg/svn/web && export

MongoDB General Installation1. First to the official website (http://www.mongodb.org/downloads) Download the appropriate installation package, the current version is 2.6Installation package has zip and MSI format, it is recommended to download the

Back to CatalogWe introduced the uncle in the package of MONGO warehousing, which introduced a few good curd operations, and for on-demand update of the internal sub-object, it is conditional, that is, your child object can not be null, that is,

This article transferred from: http://www.cnblogs.com/snake-hand/p/3172376.html1) , download MongoDB Http://downloads.mongodb.org/win32/mongodb-win32-i386-2.4.5.zipDownload the Windows 32-bit version and unzip, the program files are in the bin

Db2 uses hints (guidelines) like oracle)Db2 uses hints (guidelines) C: \ DB2> more f3.sqlSELECT d like oracle. DEPTNAME, e. FIRSTNME, e. lastnamefrom department d, employee ewhere d. DEPTNO = e. workdept and e. empno like '123 '/*

Database-recovery policy and database imageRegister log files Basic PrinciplesThe registration order is strictly in the time order of parallel transaction executionThe log file must be written before the databaseWrite a log file: indicates the

I implemented the JDBC driver for the memory database I made a memory database last year and thought it was very powerful. The memory database is a program that runs independently. The client accesses the database through socket, transmits SQL