big data database

An error is reported when Excel is inserted into big data, and an excel report is reported when data is inserted. Problems found: When I recently run the program, I found a problem, that is, when I export the excel file, I reported an error. Static void Main (string [] args) {IWorkbook wk = new HSSFWorkbook (); ISheet sheet = wk. createSheet ("StudentK"); IShee

ReferencePublic ActionResult Getdemodata (){ArrayList jsonlist = new ArrayList ();foreach (DataRow Dr in Demo.demodata (). Rows){Jsonlist.add (New ArrayList () {dr["ID"], dr["Name"], dr["Content"});}String json = Demo.datatable2json (Demo.demodata ());Return Json (Jsonlist, jsonrequestbehavior.allowget);}DHTMLX Dhtmlxgrid Display Data--Big data

fixed name for sourcetype to facilitate searching. CD/opt/splunkforwarder/etc/apps/search/local Vim inputs. conf Sourcetype = Varnish /Opt/splunkforwarder/bin/splunk restart 3.SplunkStatement search # If you are using a custom index, you must specify the index during the search. Index = "varnish" sourcetype = "varnish" OK, then we can extract fields for sourcetype = "varnish. Splunk CONF file can be referred to: http://docs.splunk.com/Documentation/Splunk/latest/Admin/Serverconf This article fr

high-efficiency in dealing with large amounts of data. For enterprises, the first problem facing big data is the cost and time effect problem. Business opportunities are not to be missed, and storage data management, through automated, disk and deduplication, backup and archiving software, allows the enterprise's key

First, the modelSecond, the model interpretationKnowledge is also defined using taxonomy, with levels describing data, information, knowledge and wisdom. Briefly, data is defined as a fact. Information is a fact with some context. Knowledge is an understanding gained from a pattern this exists with related information. Wisdom combines an understanding of any of the above with some additional exploration to

As we all know, Java in the processing of large amounts of data, loaded into memory will inevitably lead to memory overflow, and in some data processing we have to deal with a huge amount of data, in doing data processing, our common means is decomposition, compression, parallel, temporary files and other methods; For

compiler that generates map-reduce tasks. The pig language layer currently contains a native language, Pig Latin, which was originally designed to be easy to program and ensure scalability.Pig is an SQL-like language. It is an advanced query language built on mapreduce. It compiles some operations into the map and reduce OF THE mapreduce model, and users can define their own functions. Another clone Google Project sawzall developed by the Yahoo Grid Computing Department.For details, see:PigSimp

complete the transmission. Therefore, it is concluded that localconnection is not suitable for big data transmission. A transit must be found. 2. localconnection + export dobject Someone imagined using mongodobject as a transit zone, and using localconnection to notify the recipient to accept it. However, according to incomplete statistics on the QQ Show client, 10% of users intentionally or u

This is the best of times and the worst of times, let us embrace the era of big data. ----PrefaceThese days read Victor Maire's "Big Data times", feeling a lot, technology leads us into the data age. Data storage, analysis capabil

Optimize Big Data Table query and data table Optimization 1: Index, the first thing we think of first is creating an index. Creating an index can multiply the query efficiency and save time. However, if the data volume is too large, simply creating an index will not help. We know that if we count the query in a large a

toss the bottom platform to build and configuration, simple to complete the installation. This is the Gospel for Hadoop beginners.Pull a little bit more, back in the home to share the installation and use of Dkhadoop, today want to share with you is the database of big Data base content: SQL and NoSQL. To understand these two types of

The python language has been increasingly liked and used by program stakeholders in recent years, as it is not only easy to learn and master, but also has a wealth of third-party libraries and appropriate management tools; from the command line script to the GUI program, from B/S to C, from graphic technology to scientific computing, Software development to automated testing, from cloud computing to virtualization, all these areas have python, Python has gone deep into all areas of program devel

Project name Large number Calculator*************************************************The lower layer of the large number computation uses the string object storage, converts the integral type data to the character type to carry on the storage operation the addition and subtraction, uses the bitwise to carry on the subtraction, the design mark bit, the marking carries on and borrow the way; multiplication control the number of cycles on the basis of th

counterfeit devices exist. However, by imitating real-person behaviors, the "Network black market" can circumvent the Behavior Analysis Model in the background, thereby confusing app operators and exploiting loopholes. Now, with the blessing of big data technology, the APP has made great innovations in data analysis of black industries. At present, some third-pa

According to a recent survey of usage of big data tools, we know the Java program Ape's favorite big Data tool.Question: What tools or frameworks do they like most in the last year?Respondents can choose the options in the list or list their own, this article is mainly concerned about

In the era of big data, the volume of data is increasing, so there are two fundamental questions to show in front of us that is, one, how to store massive amounts of data, and the other is how to analyze the massive data, transform the d