Mongodb Clear Db

In our daily life, we are inseparable from the application of position recognition class. Apps like Foursquare and Facebook help us share our current location (or the sights we're visiting) with our family and friends. Apps like Google Local help us find out what services or businesses we need around our current location. So, if we need to find a café that's closest to us, we can get a quick suggestion via Google Local and start right away. This not only greatly facilitates the daily life, ...

MongoDB is currently the best document-oriented free Open-source NoSQL database. If you are preparing to participate in a technical interview for the MongoDB NoSQL database, you might want to look at the following MongoDB NoSQL interview questions and answers. These MongoDB NoSQL interview questions cover the basic concepts of NoSQL databases, replication (Replication), fragmentation (Sharding), Transactions and locks, trace analysis Tools (Profiler), nuances, and logging features. Let's look at the following ...

One-to-one relationship: Embed, such as http://www.aliyun.com/zixun/aggregation/10619.html "> User information collection has Address field, Address field has three fields of province, city, county. Modeling is as follows: a one-to-many relationship: An article has multiple comments, for 1 to multiple relationships because MongoDB has a size limit of 16M (higher than v1.8 ...) for single documents (document).

10gen is a cloud computing platform that can provide scalable, high-performance data storage solutions for Web applications. 10gen Open Source project is MongoDB, the main function is to solve the website of operational data storage, session object storage, data caching, efficient real-time count (such as statistical pv,uv), and support ruby,python,java,c++, PHP and many other page languages. MongoDB main feature is the storage of data is very convenient, not the traditional object-rel ...

According to IDC forecasts, in 2006 the world's data storage volume is 180,000 PB, and now this number has reached 1.8 million PB, and in 2015 years will reach 8 million PB. At the same time, analysis of the company's data shows that by 2015, the output of large data will reach 16.9 billion U.S. dollars. The big time we see Big data is coming quietly. Although data analysis has always been a part of IT industry, and data warehousing, data mining, business intelligence and so on has been continuously for the development of enterprises and innovation to provide value, but with the scale of the data index increase ...

After MySQL was acquired by Oracle, the industry has never stopped talking about the Open-source database, and the voice of PostgreSQL will be replaced as the most popular Open-source database. However, from the Db-engines rankings, the gap between PostgreSQL and MySQL is far more than "a few floors" so high (PostgreSQL not score a fraction of MySQL). Looking at the entire list of 193 databases, we will find that the NoSQL database has accounted for most of the traditional relationship ...

After MySQL was acquired by Oracle, the industry has never stopped talking about the Open-source database, and the voice of PostgreSQL will be replaced as the most popular Open-source database. However, from the Db-engines rankings, the gap between PostgreSQL and MySQL is far more than "a few floors" so high (Postgresq not score a fraction of MySQL). Looking at the entire list of 193 databases, we will find that the NoSQL database has accounted for most of the land, the listed traditional relational data ...