MongoDB

I. MongoDB Introduction MongoDB is a high-performance, open-source, and open-mode document-based database. It is currently the most popular nosql database product, it can be used in many scenarios to replace traditional relational databases or

Collections collection: insert (Array $ [, Array $ Options = Array ()]) Use of the second parameter of this method 'Safe ': Specifies a Boolean OR integer. The default value is false. If it is falseProgramWill continue, without waiting for the

First, when you start Mongo, you need to add a very heavy parameter. -- Auth with this parameter will enable severe permissions. Therefore, the owner is not responsible for permission verification by default. #./Mongod -- dbpath/data/mongo_data/--

Using system; using system. collections. generic; using system. LINQ; using MongoDB; // /// the packaging class for Mongo and mongodatabase /// public class mymongodb: idisposable {private Mongo _ Mongo; private imongodatabase _ dB; Private Static

One master and slave configuration method1. HOST (master)MASTER: 172.16.101.20.MongoDB home:/usr/local/Server/MongoDB/Data File:/usr/local/Server/MongoDB/data/Log File:/usr/local/Server/MongoDB/logs2. slave machine (slave)MASTER:

Requirements: When parsing the field value in MongoDB, it is found that the value is a JSON string and needs to be deserialized.Solution: First, I thought about finding the corresponding CIDR library at http://www.json.org/json-zh.html. I tried

MorphiaIs a lightweight type-safe Library for mapping Java objects to/from MongoDB: Morphia is a secure and lightweight Java persistence architecture designed for MongoDB. 1. To use morphia, You need to rely on the following jars: MongoDB Java

Export data using export Export Suppose there is a user table in the database with two records in it. We want to export it.> Use my_mongodbSwitched to DB my_mongodb> DB. User. Find ();{"_ Id": objectid ("4f81a4a1779282ca68fd8a5a"), "uid": 2,

Document directory First, the driver Use MongoDB in Asp.net Add data Delete data Modify data Get Data First, the driver If Asp.net wants to use MongoDB,. Net does not have its own link class. Use a third-party or official link class. Of

In MongoDB, Service Startup does not have permission verification by default. In terms of security, this is definitely not feasible. Therefore, you need to add permission verification. To verify permissions, you must have a user. Therefore, the

In the previous chapter, I posted MongoDB permission verification. I will briefly introduce some problems that may occur during the creation of verification. 1. run f: \ MongoDB \ bin> mongod -- dbpath F: \ MongoDB \ data -- logpath F: \ MongoDB \

Official reference: http://www.mkyong.com/mongodb/Use myeclipse to add a Maven-Project project. Before that, you may need to configure your m2eclipse1. Configure Maven to your own installed version. 2. Set user settingsOf course, you can also

Reprinted: http://leongfans.iteye.com/blog/1019383 I searched MongoDB information yesterday and introduced a lot of applications, but not many principles.After a rough look, the two design ideas are similar in general. They mainly distribute data

The stringbuilder class in MongoDB code. // stringdata.h/* Copyright 2010 10gen Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may

During the past two days, we found that the time of the MongoDB to be stored had changed. The difference was 8 hours. I tried to find out that it was due to time difference. Relatively speaking, it is easy to solve. When output: Time.

Check the MongoDB. log and find the following statements in the log:..............Mon Mar 317: 46: 37 [conn148] assertion: 10295: GetFile (): Bad file number value (upt DB ?) : Run repair..............Declaration: GetFile (): incorrect file value

Start MongoDB journey Luo Weifeng 2011-6-28 Environment: Ubuntu 11.04Install MongoDB $ Sudo apt-Get install MongoDB Libpcrecpp0 libboost-system1.42.0 libboost-filesystem1.42.0 is automatically installed Libboost-program-options1.42.0 libboost-thread1

Recently, we have been thinking about the architecture. One problem is that we are still plagued by these business systems, that is, logs and log statistics. The general problem is as follows: We have many modules. Although the log format is

This article is summarized by the program yuan mm in our group ----------------------------------- I am a split line ------------------------------------------ Exact match For a single key-Value Pair: {"Age": 28}, all documents whose "Age" value

Http://eshilin.blog.163.com/blog/static/13288033020106215227346/ Shard configuration for MongoDB distributed deployment 17:22:07 | category: MongoDB | font size subscriptionThis section describes the shard configuration of MongoDB. If you want to