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Describe log based recovery
The most usably structure for recording data base modification is the LOG the log is a sequence of log records recording all the update activities in the data base. There are several types of log records. An update log records describes a single data base write it has these fields
Transaction identifier
Data item identifier
Old value
New value
The various types log records as.
Ø Deferred data base modification
Ø Immediate data base modification
Ø Check point
Ø Shadow paging
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Homework chapter 10 no 3
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