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 Determining Information for Redoing Transactions 

If the system crashes, you need to restart or recover the database. The database system first gathers all the information it needs to redo any transactions that have been executed since the most recent savepoint.

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       1.      The redo log manager starts the log reader.

       2.      The log reader reads the transaction file that was stored at the most recent savepoint.

       3.      The log reader uses the transaction file to recreate the transaction list.

       4.      For transactions that were started after the most recent savepoint, the log reader asks the redo log manager or the back-up manager for the relevant redo log entries and writes them from the log area into a redo log file.

       5.      The log reader then enters these transactions into the redo list.

 

 

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