The Composition Structure of oracle Database software is divided into the core and the last-layer tool (orac) based on the core.

The core of oracle Database software is the (physical) files (such as data files, control files, and log files) on the operating systems of the database) and the rdbms (Relational Database Management System: processes that constitute the relational database management system constitute the environment of the operational management database, and the backend of an instance

The core of oracle Database software is the (physical) files (such as data files, control files, and log files) on the operating systems of the database) and the rdbms (Relational Database Management System: processes that constitute the relational database management system constitute the environment of the operational management database, and the backend of an instance

The core of oracle Database software is the (physical) files (such as data files, control files, and log files) on the operating systems of the database, and the files used for operations.Manage databaseRdbms (Relational Database Management System: CompositionRelational Database Management SystemProcesses constitute the environment for operating and managing databases, and the background processes in an instance can be said to beCompositionRelational Database Management SystemProcessesCan also be considered as running onComposedRelational Database Management SystemThe previous layer of the environment composed of processes, that isBackground process in an instanceThe successful running of depends on this environment)Such as SQL * plus, SQL Developer,OLAPAnd other tools (bothOracle Database SoftwareIsRun onComposedRelational Database Management SystemThe previous layer of the environment composed of processes, that is, the successful running of these components depends on this environment.. Of course,Rdbms (relational database management system)With the upgrade of the version, its functions are constantly extended, such as the new feature flashback added in oracle11g. For further classification, SQL * plus and SQL Developer are client tools,OLAPA tool is a server tool.

Note:

Rdbms (relational database management system)) Can be considered as running onComposedRelational Database Management SystemThe previous layer of the environment composed of processes, that isBackground process in an instanceThe successful running of depends on this environment. BecauseRdbmsAll aroundTo enable an instanceIt is designed to successfully run its functions, that isRdbmsAll of these functions areInstance PerformanceIt is designed to complete its functions, so that an environment can be built. Based on this environment, the instance canTo complete its functions.

Question reference:

Component Google

Http://zh.wikipedia.org/wiki/%E8%BD%AF%E4%BB%B6%E7%BB%84%E4%BB%B6

Http://baike.baidu.com/view/379950.htm

Software Architecture Google

Software composition Google

Component plug-in software Google

Http://hi.baidu.com/ I _ccboy/item/e9ba21fef8df670ec6dc45d0

Http://blog.csdn.net/xiaomianao2010/article/details/5959004