Undo Mode (30)

最新推荐文章于 2025-12-08 09:18:56 发布

转载最新推荐文章于 2025-12-08 09:18:56 发布 · 72 阅读

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#数据库

本文介绍了一种灵活的迁移方式，从手动撤销管理过渡到自动撤销管理。数据库系统可以在手动或自动撤销管理模式下运行。手动模式通过回滚段管理撤销空间；自动模式则在撤销表空间中进行管理。启用自动撤销管理模式只需创建撤销表空间并设置UNDO_MANAGEMENT参数为AUTO。

Undo mode provides a more flexible way to migrate from manual undo management
to automatic undo management. A database system can run in either manual undo
management mode or automatic undo management mode. In manual undo
management mode, undo space is managed through rollback segments. In automatic
undo management mode, undo space is managed in undo tablespaces. To use
automatic undo management mode, the database administrator needs only to create
an undo tablespace for each instance and set the UNDO_MANAGEMENT initialization
parameter to AUTO. You are strongly encouraged to run in automatic undo
management mode.

使用AUM:
1. 创建undo tablespace
2. UNDO_MANAGEMENT设置为AUTO

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