Re: RAC

Posted by ErmanArslansOracleBlog on Mar 20, 2019; 1:13pm
URL: http://erman-arslan-s-oracle-forum.124.s1.nabble.com/RAC-tp7294p7295.html

This is done for maintaining the consistency in RAC environments.

Consider the following scenario;

What if the instances crash right after the block is transferred to the other node?

That is why, before sending a current mode block LMS process will request LGWR for a log flush.
Until LGWR completes its job and sends a signal back to LMS process, LMS will wait on 'gcs log flush' wait event.
This is done when the requested "Current Mode" block has uncommited changes.