Basic Idea: Logging
 | Record REDO and UNDO information, for every update, in a log.
 | Sequential writes to log (put it on a separate disk).
| Minimal info (diff) written to log, so multiple updates fit in a single log page.
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| Log: An ordered list of REDO/UNDO actions
| Log record contains:
<, pageID, offset, length, old data, new data>
| and additional control info (which we’ll see soon). | | |
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