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System Change Number (SCN), Headroom, Security and Patch Information (Doc ID 1376995.1)

Last updated on DECEMBER 25, 2019

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

Purpose

Read this article to get a high level overview of how a logical timestamp, called the System Change Number (SCN), is used to order database events, and how the advance of this logical timestamp is constrained.

Scope

This document is intended for Oracle DBAs.

Details

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