> For the complete documentation index, see [llms.txt](https://docs.tibero.com/sysmasterdb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tibero.com/sysmasterdb/8.3_manual/realtime/usage-monitoring/undo-usage.md).
# Undo Usage
글로벌 내비게이션 바에서 **\[Realtime] > \[Usage Monitoring] > \[Undo Usage]** 를 클릭하면 Undo Usage 화면이 열린다.
Undo Usage 페이지에서는 Undo 사용량 정보를 보여준다. 현재 트랜잭션을 발생시킨 후 Commit 이나 Rollback을 통하여 트랜잭션을 종료시키지 않고 있는 세션들의 정보를 확인할 수 있다.
다음은 Session Undo Usage 페이지에서 제공하는 항목에 대한 설명이다.
| 항목 | 설명 |
| --------------- | ------------------ |
| SID | 세션의 SID |
| Serial# | 세션의 시리얼 번호 |
| User | 세션 사용자 이름 |
| Program | 세션의 프로그램 이름 |
| Module | 세션의 모듈 이름 |
| Segment ID | 사용 중인 세그먼트 ID |
| Used/Total Size | 사용 중인 Undo 크기 현황 |
| Used Block | 사용 중인 Undo Blocks |
| Used Rec | 사용 중인 Undo Records |
| Recovery | Recovery 중인 크기 |
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