Which two actions guarantee that time is synchronized properly on all nodes in a cluster after installing Oracle Grid Infrastructure 19c? (Choose two.)
Which two actions guarantee that time is synchronized properly on all nodes in a cluster after installing Oracle Grid Infrastructure 19c? (Choose two.)
To ensure proper time synchronization on all nodes in a cluster after installing Oracle Grid Infrastructure 19c, you should ensure that if NTP (Network Time Protocol) is not configured properly on all cluster nodes, Oracle Cluster Time Synchronization Service (CTSSD) will automatically start in active mode when clusterware starts. Additionally, if NTP is configured on all cluster nodes, CTSSD will then start in observer mode when the clusterware starts. This leverages the automatic synchronization capabilities of CTSSD in scenarios where NTP is either properly configured or not configured correctly.
https://docs.oracle.com/en/database/oracle/oracle-database/19/cwlin/setting-network-time-protocol-for-cluster-time-synchronization.html#GUID-D2CDFAC3-4CE2-4E56-B34F-81D0FD20CEFA If you have NTP daemons on your server but you cannot configure them to synchronize time with a time server, and you want to use Cluster Time Synchronization Service to provide synchronization service in the cluster, then deactivate and deinstall the NTP. When the installer finds that the NTP protocol is not active, the Cluster Time Synchronization Service is installed in active mode and synchronizes the time across the nodes. If NTP is found configured, then the Cluster Time Synchronization Service is started in observer mode, and no active time synchronization is performed by Oracle Clusterware within the cluster.
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