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        <description>언두 데이타 관리 목표

	*  DML 및 언두 데이터 생성 설명
	*  언두 데이터 모니터 및 관리
	*  언두 데이터와 리두 데이터의 차이점 설명
	*  언두 retention 구성
	*  언두 retention 보장
	*  Undo Advisor 사용</description>
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특징

	*  수정되기 전 원래 데이터의 복사본이다.
	*  데이터를 변경하는 모든 트랜잭션에 대한 캡쳐가 이루어진다.
	*  적어도 트랜잭션이 종료될 때까지는 보존된다.

지원하는 작업</description>
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공간

	*  언두 정보는 언두 세그먼트에 저장되며 언두 세그먼트는 하나의 언두 테이블스페이스에 저장된다.

언두 테이블스페이스의 특징

	*  언두 세그먼트에만 사용된다.</description>
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   Undo  Redo  기록내용  변경 사항을 언두하는 방법  변경 사항을 재생성하는 방법  사용목적  Rollback 
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