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== History ==
[[Larry Ellison]] and his two friends and former co-workers, [[Bob Miner]] and [[Ed Oates]], started a consultancy called 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 [[Central Intelligence Agency|CIA]]-funded project Ellison had worked on while formerly employed by [[Ampex]];<ref>{{cite web|url=https://www.theguardian.com/g2/story/0,3604,215072,00.html|title=Welcome to Larryland|work=The Guardian|access-date=2009-12-19|archive-url=https://web.archive.org/web/20160825232818/https://www.theguardian.com/g2/story/0,3604,215072,00.html|archive-date=25 August 2016|url-status=live}}</ref> CIA was Oracle's first customer. Ellison wanted his database to be compatible with [[IBM System R]], but the company's [[Don Chamberlin]] declined to release its error codes.{{r|rdbmsearlyyearsoh20070612}}
=== Releases and versions ===
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}}</ref><ref name="rdbmsearlyyearsoh20070612">{{Cite interview |interviewer=Burton Grad |title=RDBMS Plenary 1: Early Years |url=https://archive.computerhistory.org/resources/access/text/2013/05/102702562-05-01-acc.pdf |pages=33,35 |access-date=2025-05-30 |publisher=Computer History Museum |date=2007-06-12}}</ref> For some database releases, Oracle also provides an Express Edition (XE) that is free to use.<ref>{{cite web |title=Free Oracle Database for Everyone |url=https://www.oracle.com/database/technologies/appdev/xe.html |website=[[Oracle Corporation|Oracle]] |access-date=19 February 2024}}</ref>
Oracle Database release numbering has used the following codes:
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