I have some questions i need answering due to the vagueness of the internet,
what is Oracle?
what are the different types or versions?
which is the best to learn?
which books are a good source to learn?
are there any online courses (as in study from home)?
This post first appeared at Oracleinaction (http://oracleinaction.com/undo-and-redo-in-oracle/)by Anju Garg (Myself).
I will demonstrate that undo for DML’s is stored both in undo tablespace and online redo logs. Then, we will analyze the reaso…