mongodb "sequential id

mongodb + helma to achieve rapid development of web

Mongodb is a high-performance, open source, non-model document database, online presentation have been many, not more to say. Official Website: http://www.mongodb.org/display/DOCS/Home. In some of the transaction, they are not strict project, you can cons

django, mongodb and testing

In django is easy to write the next test, just need to inherit DjangoTestCase, it will automatically create a test database, each fixture run-time loads the necessary data to ensure that the initial state of each test is consistent and predictable. The pr

SQL Query Optimization superstition of the articles index

Thank you for the concern of friends, but note that the purpose of this post I am not saying do not use the index, but not blindly use, where 10 000 data is specially created for all tables in consecutive t_noindex.x value not in the same block store

SQL2005 and lock in the transaction

Source: http://blog.csdn.net/happyflystone Finally settled down to write an article for this transaction and lock, only to find really difficult to write to write, transactions, affairs and lock this topic too complex, and even some also touched (that is,

SQL Server user permissions check

sp_helprotect Returns a report, the report contains the current database user permissions for an object or statement permissions. Grammar sp_helprotect [[@ name =] 'object_statement'] [, [@ username =] 'security_account'] [, [@ granto

mongodb from the solution by id

mongodb from the solution by id mongodb id autoincrement mongodb no solution since by id 1. function insertObject (o) ( x = db.myCollection; while (1) ( / / Determine next _id value to try var c = x.find ({},{_ id: 1)). sort ((_id: -1)). limit (1); v ...

Spring and Morphia, MongoDB a simple package and self-realization by ID (r)

Original Address: http://www.oschina.net/code/snippet_98659_3681 One pair of Spring and Morphia a simple package, aimed at Mongo's self-realization by ID and to facilitate integration with Spring. Tags: Spring, mongodb, morphia, nosql Snippet (15

MongoDB and MongoMapper sample usage profile

MongoDB and MongoMapper sample usage profile Translator: Night Ming pig (http://hlee.javaeye.com/) Proofreading: wow cow (http://ywencn.javaeye.com/) MongoDB database engine based on the document, which the traditional relational database, such as MySQL i

How to Maintain MongoDB the _id java auto-growth fields

_id field is MongoDB a particular field, it is of type BSON ObjectId. It is the first attribute of each record, and the attribute value must be unique. BSON ObjectId 12 bytes long, contains 4 bytes of timestamp, 3 bytes of the machine id, 2 bytes 3 b ...

How to maintain MongoDB java in the _id field of automatic growth

_id field is MongoDB a particular field, it is of type BSON ObjectId. It is the first attribute of each record, and the attribute value must be unique. BSON ObjectId 12 bytes long, contains 4 bytes of timestamp, 3 bytes of the machine id, 2 bytes 3 b ...

[Change] mongodb gridfs collection

MongoDb really is a good thing. I have a project in a recent practice, the experimental use of this thing. In tests, the GridFS quite satisfied. First of all, and traditional MogileFS different, gridfs and other meta data can be deployed in the same db, t

Introduction Introduction and MongoDB NoSQL

EDITORIAL This article is sorted out by the speech, the text most of the information from the network, for Wikipedia, Google and MongoDB official website. The paper used MongoDB version 1.2.4. What is NoSQL NoSQL Carlo Strozzi first term in 1998, put ...

The design of the database ID field

Background: 1, some time ago in Xinjiang's external network can not access, companies need to set up mirrors in the Xinjiang region. The results they have access to the TM, the company also requested the mirror and the Xinjiang region's uniqu

Symfony by DoctrineMongoDBODM visit MongoDB

I. Introduction Development Environment: PHP 5.3.0 + / Symfony 1.4.4 / DoctrineMongoDBODM 1.0.0 / MongoDB 1.4.4 Reading Tip: This required the reader to understand the following namespaces PHP , Symfony framework , MongoDB , Doctrine ODM ( download ODM )

MongoDB advanced query-shell articles (1)

MongoDB advanced query-shell articles Translated from http://www.mongodb.org/display/DOCS/Advanced+Queries part. In fact, the content is not difficult to understand, the main English bitter hand to take care of brothers, but also convenience. Here is main

Memcache cache and advantages of the database and application Mongodb

Talk about my own on some of the views Memcache and Mongodb mainly start a discussion, and hope to see everyone's views and added. Memcache I think that summed up the advantages of Memcache down mainly in: 1) distributed. Can have a 4G memory from the

PHP + MongoDB combination do visit statistics

MongoDB is a now very popular NoSql engine. I saw the two reasons. 1, the perfect support php. Very rich interface. 2, high concurrency of inserts and contrast mysql write great advantage. I've tested. Search an average of 2.5 times. Insert and update

David Mytton Why migrate from MySQL database to MongoDB

Inscription: Quit work, at home idle is idle, studied under non-relational database, and happened to see the robbin write Big Brother "NOSQL database of" we urgently want to study, the aware MongoDB some basic knowledge, the went to look up unde

MongoDB applications: Design and Implementation of dynamic message

Is now extremely strong social networking sites, Facebook, everyone, happy network in just a few years, another to lead the Internet era - the online social networking, if the first time is the content provided through the portal, the second era through t

Eliot Horowitz, founder of MongoDB FourSquare downtime reasons

The last book we mentioned: October 4, 5, due to data fragmentation and the reasons for poor control, FourSquare experienced two down. FourSquare background database using MongoDB, the problem is resolved soon, MongoDB development company 10gen co-founder

Visual NoSQL China Road: From MySQL to MongoDB

Text / Pan Van Cause Vision China website (www.chinavisual.com) is the largest creative people, professional website. By 2009, with many companies, our products are built CMS and communities in the PHP + Nginx + MySQL on; MySQL uses the Master + Master

The use of Java-driven consolidation MongoDB

This document is translated from the document [mongodb-docs-2010-10-24.pdf] of the [Java Language Center] section, made according to their own understanding of order. I hope to give people like me came into contact with friends a little help, but also to

mongodb first experience

package com.yt; import java.net.UnknownHostException; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import javax.annotation.Resource; import org.springframework.stereotype.Controller; import org.springframework.web.bin

Linux install MongoDB

Step One: Download the file for 32-bit linux $ Curl http://downloads.mongodb.org/linux/mongodb-linux-i686-1.4.4.tgz> mongo.tgz $ Tar xzf mongo.tgz For 64-bit linux $ Curl http://downloads.mongodb.org/linux/mongodb-linux-x86_64-1.4.4.tgz> mongo.

[7] MongoDB patch management (Sharding Administration)

【7】 MongoDB patch management (Sharding Administration) Here are several very useful command, you can get a slice of some cluster configuration information. Slice on how to configure please see: http://datalife.javaeye.com/blog/805201 A: If it is dete

Mongodb's MapReduce learning experience

Mongodb's MapReduce learning experience Mongodb's Map / reduce the quantities of operating data or aggregation operation is useful. This is the official website of the English document, you can see: http://www.mongodb.org/display/DOCS/MapRedu

Statistical analysis based on MongoDB MapReduce

As already briefly introduced in OECP community MongoDB an application: Design and Implementation of dynamic message . In the last application, we only introduced the most basic queries on MongoDB, today I will introduce more advanced applications MongoDB

Mongodb VS Mysql query performance

Original Source: http://blog.chenlb.com/2010/05/mongodb-vs-mysql-query-performance.html Environment: the same machine, with mongodb 1.4, mysql; memory 4g; two databases are only id the only search; data about 120w, 5w queries. Id or ids on them for d

Survey Summary MongoDB

Compared with the relational database, MongoDB advantages: ① weak consistency (final agreement), to better ensure the user's access speed: For example, in traditional relational database, a type of operation will be locked COUNT data set can be guaran

mongoDB JAVA operation

Use mongoDB need to import the following classes, of course, not all of the needs of the class used to import. import com.mongodb.Mongo; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.BasicDBObject; import com.mongodb.DBObject;

mongodb primary combat

Reserved Address: http://www.blogjava.net/envoydada/archive/2010/06/23/324266.html Database connection Now we are through the shell to the database about the actual operation. (Note: Any programming language can be a suitable driver for similar operations

MongoDB System Introduction

================================ 【Reserved Address: http://www.osseye.com/?p=536 】 ================================ 1. Knowledge and understanding of MongoDB MongoDB is a set-oriented, model free document database. Set-oriented, meaning that data is group

MongoDB common database operations

function find(query, fields, limit, skip) 1, Multiple where conditions // i.e., select * from things where x=3 and y="foo" db.things.find( { x : 3, y : "foo" } ); db.things.find({j: {$ne: 3}, k: {$gt: 10} }); 2, Query part of the field // select z from th

NoSql Selection: MongoDB should choose (a)

The time needed to test the characteristics of non-relational data, so do some simple validation, follow-up may also be more complex to do some further validation tests. Even the simple test, MongoDB left me with a good impression, we can say is amaz

Will be imported into a mysql table in the ruby ​​script mongodb

Features: The mysql table data into the specified designated mongodb table, the import process to ensure that data is not lost, if the data are updated guidance will be re. Requirements: Source table must have two fields: id: primary key mmm_ts: Last

mongoDB distributed database file storage

http://www.mongodb.org http://www.iteye.com/topic/987224 mongoDB performance and optimization of the initial test MongoDB is based on a distributed file storage database. By the C + + language. WEB application is designed to provide a scalable, high-perfo

mongoDB presentations and related operations (6)

Morphia-Mongodb the orm Morphia, a lightweight type safety of Java class libraries used in MongoDB and the mapping between Java objects. Similar to hibernate. If you have used hinernate at hand quickly and then use it POJO @ Entity (value = "test

mongoDB presentations and related operations (7)

Morphia-Mongodb the orm Morphia, a lightweight type safety of Java class libraries used in MongoDB and the mapping between Java objects. Similar to hibernate. If you have used hinernate at hand quickly and then use it POJO @ Entity (value = "test

[Transfer] MongoDB Summary

Used for a while mongodb, make some summary, for future reference. In accordance with past practices, the first for an overview, and then pick some of their more concerned about a few points, as valuable, to be elaborated in series. mongodb written in C +

MongoDB Tutorial (reproduced)

See original: http://www.mongodb.org/display/DOCS/Tutorial Translation link: http://chenxiaoyu.org/blog/archives/242 Start the database Download MongoDB, unzip and start: $ bin/mongod MongoDB default data storage directory is / data / db / (or c: \ data \

java operating mongodb

Use mongoDB need to import the following classes, of course, not all need to use the classes to import. import com.mongodb.Mongo; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.BasicDBObject; import com.mongodb.DBObject; i

MongoDB Eliot Horowitz, founder of the reasons for downtime analysis FourSquare

Back on the books we mentioned: October 4, 5, due to data fragmentation and inadequate monitoring of the reason, FourSquare experienced two down. FourSquare use back-end database for the MongoDB, the problem is resolved soon, MongoDB development comp

MongoDB use of Java-driven sorting

This document is translated from the document [mongodb-docs-2010-10-24.pdf] in [Java Language Center] section, according to their own understanding of order is made. I hope to give people like me a little help getting started with a friend, but also to be

[7] MongoDB slice Management (Sharding Administration)

[7] MongoDB slice Management (Sharding Administration) Here are a few useful commands, you can get a slice of some of the cluster configuration information. On how to configure the slice, please see: http://datalife.iteye.com/blog/805201 A: If it is

Mongodb of MapReduce learning experience

Mongodb of MapReduce learning experience Mongodb's Map / reduce polymerization in bulk operations or when the data is useful. This is the official website of the English document, you can see: http://www.mongodb.org/display/DOCS/MapReduce Now, ho

MongoDB Survey Summary

Compared with relational databases, MongoDB advantages: ① weak consistency (end line), to better ensure the user's access speed: For example, in traditional relational databases, a type of operation will be locked COUNT data set, it can guarantee

[Reserved] Mongodb Definition Guide author on the internal replication mechanism (a)

Original: http://www.snailinaturtleneck.com/blog/2010/10/12/replication-internals/ This is the first in a three-part series on how replication works. Replication is awesome: it gives you hot backups, read scaling, and all sorts of other goodies. If y

MongoDB syntax with existing relational database SQL syntax is

MongoDB MySql syntax grammar db.test.find ({'name': 'foobar'}) <==> select * from test where name = 'foobar' db.test.find () <==> select * from test db.test.find ({'ID': 10}). count () <==> select cou

[Reserved] MongoDB Eliot Horowitz, founder of the reasons for downtime analysis FourSquare

[Sic] http://www.infoq.com/cn/news/2010/10/eliot-analyze-outage-of-4sq Back on the books we mentioned: October 4, 5, as data fragmentation and inadequate monitoring of the reason, FourSquare experienced two down. FourSquare use back-end database for

mongodb client command

Mongo client commonly used commands First, the database-related commands 1 show dbs / / list all databases 2 use memo / / database memo. Even if the database does not exist can be implemented, but will not immediately create the database, perform the
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