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Categories: :Category:Database management systems Database management systems Databases Database theory Articles to be expanded since June 2008 All articles to be expanded |
Summary Of: DatabaseThe first database management systems were developed in the 1960s... originally as an operating system with an embedded database and the latter as a programming language and database for the development of healthcare systems... The first successful database product for microcomputers was... Most database systems are built around one particular data model... disadvantage is that in order to prepare the database it becomes necessary to identify the requisite groups of files that are to be logically... operations such as database loading and restructuring could be very time... All tables in a relational database adhere to three basic rules... request data from a relational database by sending it a... the database returns a result set... and the database cannot meet the requirements for higher level normal forms without first having met all the... Each record in the database can have multiple parents... Examples of database engines that have network model capabilities are RDM Embedded and RDM Server... The entire information content of the database is represented in one and only one way... These databases attempt to bring the database world and the application programming world closer together... in particular by ensuring that the database uses the same... and defining a database programming language that allows full programming capabilities as well as traditional query facilities... a specific technique is chosen by the database designer to increase efficiency in the particular case of the type of index required... The database chooses between many different strategies based on which one it estimates will run the fastest... the database software should enforce the... If a database can log its individual actions... and procedures that protect a database from unintended activity... many commercial database vendors provide built... is how the database handle multiple concurrent operations... A database can set and hold mutiples locks at the same time on the different level of... last is determined by the database engine locking scheme based on the submitted SQL or transactions by the users... Generally speaking no activity on the database should be translated by no or very light locking... Exclusive locks are usually set while the database needs to change data... Shared locks are usually used while the database is reading data... The Database has a fail safe mecanism and will automatically... there are a number of database architectures in use... Finally it should be noted that not all database have or need a database... Software database drivers are available for most database platforms so that... For example suppliers database contains the data relating to suppliers such as... Database Theory Discussion Group...Encyclodia Page On: Database |
