Introduction to Mysql - 1270 Words

MySQL is an open source Relational Database Management System based on the Structured Query Language (SQL). It is very fast reliable and flexible Database Management System based on relation model that is developed to manage large volumes of data at very high speed with security. MySQL can be used for verity of applications but it is one of the most popular RDBMS used for the web applications on the Internet. It is referred as open source because it can be run on different platform such as Unix, Linux, Windows, OS/2, and etc. It is possible for anyone to use and modify the software. If you wish, you may study the source code and change it to suit your needs. MySQL is based on a client/server model; its database package†¦show more content†¦Transaction Control The purpose of Transaction Control is to provide transactions and concurrency. Transaction allows the users to manipulate data atomically and concurrency where multiple concurrent users can access the data in a consistent way. The transaction control subsystem consists of Transaction Manager and Lock Manager components. The transaction manager takes care of atomic manipulation of data by temporarily storing copies of data. The lock manager sets locks in tables or records of a table. Recovery Manager The Recovery Manager is responsible for keeping copies of data and record in which changes has been done. So that in case of primary data files crash, the database can be restored in a consistent state as just before the crash occurred. Its sub-system consists of the Logger that records any modifications done in the database in log files, and Backup Recovery through which a DBA can save copies of the data files that can be used later in concurrence with log files to restore the database in a consistent state. Introduction to Basic SQL statements As we have discussed that, most commercial RDBMS’s use the Structured Query Language (SQL) to access the database. 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