Describe log based recovery, Database Management System

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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.

< Ti start >. Transaction Ti has started
< Ti , Tx v1,v2 > .Transaction Ti has performed a right on data item
< Ti commit > Transaction Ti has committed
< Ti about > Transaction Ti has aborted

Ø Deferred data base modification

Ø Immediate data base modification

Ø Check point

Ø Shadow paging

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