All About Oracle's In-Memory Undo
All About Oracle’s In-Memory UndoThe Oracle database is extremely complex software. Part of the solution to performance
optimization is Oracle Corporation itself optimizing the core database kernel code. One such
optimization is the introduction of Oracle’s patented In-memory undo (IMU). Essentially,
instead of maintaining undo in Oracle segments, the undo is managed, as much as possible, in
memory using structures optimized for in-memory operations. But as you will read, how
Oracledoes this is fascinating and foreshadows even greater things to come. But with any
piece of code, there is always the possibility of a bottleneck, so this paper covers how to detect
IMU performance issues and multiple ways to potentially solve the problem(in addition to just
tuning it off).
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