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The On-line Redo Log is a set of tow or more on-line redo
files that record all committed changes made to the
database. Whenever a transaction is committed, the
corresponding redo entries temporarily stores in redo log
buffers of the SGA are written to an on-line redo
log file by the background process LGWR. The on-line redo
log files are used in cyclical fashion.
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