Go back to 1Z0-031 - Oracle9i Database: Fundamentals I

Question :-

You are working on an OLTP system where transactions are being performed. In which two situations will the log writer (LGWR) write redo entries to the online redo log files? (Choose two.)
when there is more than 1 KB of changes recorded in the redo log buffer
when the redo log buffer is one-fourth full
after database writer (DBWn) writes dirty buffers to the data files
when a transaction commits
every three seconds

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