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As I said, in Oracle an instance refers to the memory and background processes. A database refers to the physical files that store the data. Both are needed to provide the user with the information he or she needs.
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www.devx.com/dbzone/Article/20713
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An instance is the software (and memory) that Oracle uses to manipulate the data in the database. In order for the instance to be able to manipulate that data, the instance must open the database. A database can be opened (or mounted) by more than one instance, however, an instance can open at most one database.
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www.adp-gmbh.ch/ora/misc/database_vs_instance.html
www.adp-gmbh.ch/ora/misc/database_vs_instance.html
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René Nyffenegger on Oracle - Most wanted - Feedback; ... An instance is the (executed) Oracle software (Oracle processes) and the memory they use (SGA). It is the instance that manipulates the data stored in the database.
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www.adp-gmbh.ch/ora/admin/instance.html
www.adp-gmbh.ch/ora/admin/instance.html
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Chapter 5: Managing the Oracle Instance ... This chapter focuses on the tasks involved in managing your instance. In this chapter, you will learn how to use the property pages in the Instance region of the Administration page of Enterprise Manager. ... Using Enterprise Manager to Start Up and Shut Down the Oracle Instance...
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www.oracle.com/technology/obe/2day_dba/instance/instanc...
www.oracle.com/technology/obe/2day_dba/instance/instance.htm
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The operating system limits the number of CPUs where an Oracle database is running by creating areas where CPU resources are allocated to applications within the same operating system. The database administrator can set the number of CPUs to the number of licensed CPUs.
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www.oracle.com/corporate/pricing/partitioning.pdf
www.oracle.com/corporate/pricing/partitioning.pdf
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Part III ; The Oracle Instance ... Part III describes the architecture of the Oracle instance and explains the different client/server configurations it can have in a network environment. Part III also explains the Oracle startup and shutdown procedures.
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www.cs.uvm.edu/oracle9doc/server.901/a88856/part_3.htm
www.cs.uvm.edu/oracle9doc/server.901/a88856/part_3.htm
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Once you've addressed those tasks, the next place to look is within the Oracle instance itself. An Oracle instance consists of the memory region of the database, called the System Global Area or SGA, and the Oracle background processes.
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www.dba-oracle.com/art_tuning_instance.htm
www.dba-oracle.com/art_tuning_instance.htm
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Single-Process Oracle Instance ... running Oracle database is associated with an Oracle instance. ... A single-user Oracle instance is a database system in which all Oracle code is executed by one process.
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cis.csuohio.edu/~matos/notes/cis-612/Oracle_Notes/html_...
cis.csuohio.edu/~matos/notes/cis-612/Oracle_Notes/html_notes/3SERVER.html
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Before I explain an "instance", I need to explain what a "database" is. Different vendors use these terminologies to mean different things. In Oracle-speak, a "database" is the collection of datafiles on disk. ...
http://searchoracle.techtarget.com/answer/What-s-an-Ora...
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