- The best recommendation is to synchronize nodes using Network Time Protocol (NTP).
- Modify the NTP initialization file to set the -x flag, which prevents time from being adjusted backward.
# vi /etc/sysconfig/ntp
OPTIONS="-x -u ntp:ntp -p /var/run/ntpd.pid"
If NTP is not used, Clusterware will automatically configure Cluster Time Synchronization Service (CTSS).
Note: Adjusting clocks by more than five minutes can cause instance evictions. It is strongly advised to shut down all instances before date/time adjustments.
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