Basics of Oracle
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Published: 30 Aug 2007
In this article Abhinash descibes the basics of Oracle and some of the terms associated with the database language.
by Abhinash Jena
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Oracle is a Relational Database Management System. It was designed to make it possible for allowing simultaneous access to a larger amount of stored data. Normally RDBMS consists of the database (this contains the physical files residing in the system and also the logical data) and the instance. The Oracle database has two layers.

The Physical Layer – This layer consists of files like datafiles, redo log files and control files that reside on the disk. Datafiles consists of information contained in the database. Redo log files are used to hold information which can be used during recovery in the event of a system failure. Control files contain information used to start an instance.

The Logical Layer – This layer consists of one or more tablespaces (tablespace is used to group data together logically) and the database schema (database schema is a collection of logical structure objects) consisting of various items such as tables, clusters, etc.

The database schema consists of:

·         Table – It is the basic storage unit in the Oracle database.

·         View – It acts as a window into one or more tables. A view, like a table, can be updated, deleted and queried.

·         Cluster – It is a group of tables stored together as one table sharing a common column.

·         Index – It is used to retrieve data more quickly and efficiently.

·         Stored Procedure – It is a predefined query that is stored in the data dictionary.

·         Sequence – It is used to generate a unique sequence of numbers in a cache.

·         Database Trigger – It is a procedure that is invoked automatically when an event occurs.

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User Comments

Title: Basiscs of Oracle   
Name: code Guru
Date: 2008-08-18 3:58:07 PM
thanks 4 making the basics verry simple..otherwise most of the people make the basics so much difficult that beginners quit learning ..
nd yeah um looking 4 more topics
Title: Oracle Basics   
Name: Chiranjeevi
Date: 2008-04-08 7:12:23 AM
Hi Abhinash Jena,

Its a good and wonderful article.
please continue it and add cover more topics.
Title: Data Types   
Name: Steven M. Swafford
Date: 2007-09-01 10:14:23 PM
Is there are reason you did not cover all data types? Also why do you consider those you listed as important? It would have been nice to see TIMESTAMP, BLOB, and etc... There are also data types releveant to PL/SQL: binary_double, binary_float, dec, decimal, and more...
Title: Re:Whats wrong with ASPALLIANCE   
Name: Abhas Roy
Date: 2007-08-31 11:42:42 AM
Hello Mr Tired. First of all if this article was not of your use why did you read it. There are people for whom this knowledge is important. May not be for you. And second I dont think there is anything on internet that are not found on books. Internet and books are just two alternative mediums to gain knowledge.
Thanks Abhinash Jena for providing fundamentals of Oracle in this article.
Title: Re:Whats wrong with ASPALLIANCE   
Name: Haissam Abdul Malak
Date: 2007-08-31 7:20:10 AM
First thank you for this article.
Second Aspalliance provides articles for all users levels if you are an advanced developer, i think there are lots of beginners who need to read such articles.

Best Regards,
Title: What you want is what you get!!   
Name: Abhinash
Date: 2007-08-31 2:16:47 AM
well i tried to write your so called "advanced" article i.e Siebel Analytics but the article was rejected..hope you heard about siebel analytics.
Title: Whats wrong with ASPALLIANCE   
Name: Tired
Date: 2007-08-30 10:54:10 PM
ASP Alliance is losing it as per me. They are publishing useless articles. This information can be found in any book. Whats the use in these kind of articles. Nothing against the author but asp alliance should promote some advanced articles.
Title: Good start   
Name: Debjani
Date: 2007-08-30 1:02:37 AM
Good article for beginners
Title: Mr   
Name: Tarun Kanti Nanda
Date: 2007-08-28 3:44:20 AM
Thanks Abhi. This is very nice. Previously i was some doubt in view but now it is fine.
Title: Mr.   
Name: Byomokesh Sarangi
Date: 2007-08-28 2:43:37 AM
thanks abhi for such a wonderful article i was reall confused with the tables and views on tables and synonyms.

thanks buddy really appreciate this work,, and now even i can finish up my project
keep up the good work
Title: GR8   
Name: JOHN
Date: 2007-08-28 2:33:08 AM

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