> 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/8.4_manual/analysis/history-analysis/changed-plan-analysis/plan-history-comparison.md).

# Plan History Comparison

Plan History Comparison 화면에서는 New Plan List에서 선택한 SQL의 Plan 이력을 History 01, History 02 두 표에 TimeStamp와 Plan Hash Value로 보여준다. 각 표에서 비교할 Plan을 하나씩 선택하면 선택한 Plan Hash Value의 Plan이 나란히 표시되어 비교할 수 있다. 이때 Plan은 Plan Tree 형태와 Plan Text 형태로 전환해 확인할 수 있다.

<figure><img src="https://264733866-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fgw24XwSa6QXLFywb7Txd%2Fuploads%2Fad8xtRxPGNxedeMhjjjG%2F193_plan-tree.png?alt=media" alt=""><figcaption><p><strong>Plan History Comparison 화면 - Plan Tree 형태</strong></p></figcaption></figure>

<figure><img src="https://264733866-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fgw24XwSa6QXLFywb7Txd%2Fuploads%2FTHaiHdWddB8x1qZZqTPN%2F194_plan-text.png?alt=media" alt=""><figcaption><p><strong>Plan History Comparison 화면 - Plan Text 형태</strong></p></figcaption></figure>