As part of processing transactions, Oracle captures how the data is modified (redo) and writes that information to the log buffer memory area. Next, the log writer background process will frequently write the redo information to disk (online redo logs). If you have archiving enabled in your database, as soon as an online redo log is filled up, the archiver process will copy the online redo log to an archived redo log. The architecture of processing transactions and the subsequent redo stream is displayed in Figure 7-1 ...
© Darl Kuhn and Thomas Kyte 2021
D. Kuhn, T. KyteOracle Database Transactions and Locking Revealedhttps://doi.org/10.1007/978-1-4842-6425-6_77. Investigating Redo
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