In busy databases you may encounter this wait event. The general reason is the low redo log I/O performance or the slow interconnect connection.
As a solution of this wait event;
- You can increase the performance of Interconnect network. For example, instead of 1g cards, you can create an interconnect interface on 10g cards.
- You can move Redo log files onto faster disks.
- Or, you can set the value of the _cr_server_log_flush parameter to false. This is not suggested.
You can change the value of the parameter as follows.
SQL> alter system set "_cr_server_log_flush"=false scope=both sid='*';