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What is the Oracle?

Oracle Database (commonly referred to as Oracle RDBMS or simply Oracle) is a relational database management system (RDBMS) produced and marketed by Oracle Corporation. As of 2008, Oracle had become a major presence in database computing

Larry Ellison and his friends and former co-workers Bob Miner and Ed Oates started the consultancy Software Development Laboratories (SDL) in 1977. SDL developed the original version of the Oracle software. The name Oracle comes from the code-name of a CIA-funded project Ellison had worked on while previously employed by Ampex

Database Schema

Oracle database conventions refer to defined groups of ownership (generally associated with a "username") as schemas. Most Oracle database installations traditionally come with a default schema called SCOTT. After the installation process has set up the sample tables, the user can log into the database with the username scott and the password tiger. The name of the SCOTT schema originated with Bruce Scott, one of the first employees at Oracle (then Software Development Laboratories), who had a cat named Tiger

The SCOTT schema has seen less use as it uses few of the features of the more recent releases of Oracle. Most recent examples reference the default HR or OE schemas. Other default schemas include:

• SYS (essential core database structures and utilities)
• SYSTEM (additional core database structures and utilities, and privileged account)
• OUTLN (utilized to store metadata for stored outlines for stable query-optimizer execution plans
• BI, IX, HR, OE, PM, and SH (expanded sample schemas containing more data and structures than the older SCOTT schema

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