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Cycling through Oracle redo logs

Oracle starts by writing to the first redo log group, and writes the exact same information to each member file of the group

When the first redo log group is full, Oracle moves on to the second group.

After the second group fills, Oracle moves on to the third redo log group.

Oracle Database Administration
After the third and last group fills, Oracle starts the cycle over again with group 1. Information previously in group1 is overwritten.

When the first redo log group is full, Oracle moves on to the second group.