Storm Database

First of all: Hadoop is disk-level computing, when computing, data on disk, need to read and write disk; http://www.aliyun.com/zixun/aggregation/13431.html ">storm is a memory-level calculation, Data imports memory directly over the network. Read/write memory is faster n order of magnitude than read-write disk. According to the Harvard CS61 Courseware, disk access latency is about 75,000 times times the latency of memory access. 　　So storm faster. ...

Simple and clear, http://www.aliyun.com/zixun/aggregation/13431.html ">storm makes large data analysis easier and enjoyable. In today's world, the day-to-day operations of a company often generate TB-level data. Data sources include any type of data that Internet devices can capture, web sites, social media, transactional business data, and data created in other business environments. Given the amount of data generated, real-time processing has become a major challenge for many organizations. ...

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The storm struck. The trees were blown down over the wires and the water level elevated. The emergency management team is busy calculating the losses. The first responders intuitively answer these questions often starting with a map. These maps are often provided by Geographic information Bae (GIS) leader Esri. A few weeks ago, my visit to their REDLANDS,CA headquarters happened one day after Hurricane Sandy hit the east coast. Long-term GIS solutions have been developed into complex http://www.al ...

There are two main ways to store data: Database and filesystem, and the object-oriented storage are developed behind, but the overall thing is to store both structured and unstructured data. DB is initially serviced for structured data storage and sharing. FileSystem storage and sharing is large files, unstructured data, such as pictures, documents, audio and video. With the increase in data volume, stand-alone storage can not meet the needs of structured and unstructured data, then in the era of cloud computing, there is a distributed ...

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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 ...

Even in the recession, China's online shopping has also broken through the huge number of trading scale, this is only the domestic trade figures, the size of the network to reach the scale of tens of billions of transactions. According to the authoritative investigation organization report, the electronic commerce by reduces the transaction cost, enhances the transaction efficiency, shortens the remittance time, expands the sale scope and so on the characteristic to be able to enhance the enterprise competitiveness effectively, uses the electronic commerce traditional small and medium-sized enterprise to survive the global economic crisis last year is 5 times times higher than the traditional In the business confidence index, 65% use E-commerce SMEs have the confidence and ability to tide over economic difficulties; and offline ...