simple relational database

Source: http://blog.csdn.net/robinjwong/article/details/185021951. Relational databaseRelational database refers to a database that uses a relational model to organize data.The relational model was first proposed by IBM researcher Dr. E.f.codd in 1970, and in the following d

Label:1. Relational databaseRelational database refers to a database that uses a relational model to organize data. The relational model was first proposed by IBM researcher Dr. E.f.codd in 1970, and in the following decades, the concept of

, such as sending a message, after a few seconds or even more than 10 seconds to see this dynamic is completely acceptable Complex SQL, especially Multiple table association queries Any large data web system, is very taboo on multiple large tables associated query, as well as complex data analysis types of complex SQL report query, especially SNS type of Web site, from the needs and product class angle, to avoid this situation. Often more just a single table of primary key query, as well as sin

Tags: filter example row storage Dremel processing Speed font statement classificationA few graphs to read the column-type storageThe parallel execution of SQL queries is derived from Dremel and Impala , so we take this opportunity to learn more about relational databases and the parallel computation of relational algebra . speedup and scaleup Speedup refers to using twice times the hardware for half of

environment variable):After executing the VIM ~/.BASHRC command, add the following MongoDB configuration to the bottom:After configuration, use source ~/.BASHRC to make the configuration effective, and then use mongod-version to check whether the configuration was successful:6: Start the MongoDB database, first create the MongoDB data directory, and next create the MongoDB log directory:Start the MANGODB database