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SAP HANA Undo & REDO Log

Jun 14, 2017 at 05:54 PM

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Reading the Article SAVEPOINT(Redo,undo and Savepoint)

Question 1: Where is the undo log saved? IS it part of DATA or in the log volume?

Question 2: Only changes to MEM Data will be written (Write) to log volume. Not ALL data (Read) is written to log volume. Correct?

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1 Answer

Lars Breddemann
Jun 14, 2017 at 10:24 PM
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What article are you reading?

What do you mean by your second question?

Why do you think there is something like an undo-log? In HANA multiple versions of records are kept enabling undo/MVCC.

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